/* roulang page: index */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 96px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }

        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }

        .main-nav a {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }

        .main-nav a.active {
            color: var(--accent-cyan);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }

        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }

        .main-nav a:not(.active):hover::after {
            left: 12px;
            width: calc(100% - 24px);
        }

        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 18px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
        }

        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }

        .nav-cta::after {
            display: none !important;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }

        .hamburger:hover span {
            background-color: var(--accent-cyan);
        }

        /* Mobile drawer */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(6, 9, 16, 0.98);
            z-index: 99;
            padding: 24px;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            padding: 14px 16px;
            font-size: 15px;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            min-height: 48px;
            display: flex;
            align-items: center;
            transition: all var(--transition-fast);
        }

        .mobile-menu a:hover {
            background-color: rgba(255, 255, 255, 0.05);
            color: #fff;
        }

        .mobile-menu a.active {
            color: var(--accent-cyan);
            border-left: 3px solid var(--accent-cyan);
            background-color: rgba(82, 229, 255, 0.06);
        }

        /* Hero Section - 矮横幅风格 */
        .hero-section {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            padding: 56px 0 48px;
            background-image: 
                radial-gradient(ellipse at 20% 30%, rgba(82, 229, 255, 0.08) 0%, transparent 55%),
                radial-gradient(ellipse at 80% 20%, rgba(123, 92, 255, 0.08) 0%, transparent 50%),
                url('/assets/images/backpic/back-1.webp');
            background-size: cover, cover, cover;
            background-position: center, center, center;
            background-blend-mode: normal, normal, overlay;
            border-bottom: 1px solid var(--border-light);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(180deg, rgba(10, 14, 26, 0.75) 0%, rgba(10, 14, 26, 0.85) 100%);
            z-index: 1;
        }

        .hero-section .container {
            position: relative;
            z-index: 2;
        }

        .hero-content {
            display: grid;
            grid-template-columns: 1.4fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .hero-text {
            max-width: 640px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: rgba(82, 229, 255, 0.1);
            border: 1px solid rgba(82, 229, 255, 0.25);
            color: var(--accent-cyan);
            font-size: 13px;
            font-weight: 500;
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 18px;
        }

        .hero-badge .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background-color: var(--accent-cyan);
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; box-shadow: 0 0 6px rgba(82, 229, 255, 0.6); }
            50% { opacity: 0.5; box-shadow: 0 0 2px rgba(82, 229, 255, 0.2); }
        }

        .hero-title {
            font-family: var(--font-heading);
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .hero-title .highlight {
            color: var(--accent-cyan);
            text-shadow: 0 0 20px rgba(82, 229, 255, 0.3);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 580px;
            margin-bottom: 24px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            background-color: rgba(26, 34, 54, 0.7);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            backdrop-filter: blur(8px);
        }

        .hero-stat-item {
            text-align: center;
        }

        .hero-stat-number {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent-amber);
            font-family: var(--font-heading);
            line-height: 1.2;
        }

        .hero-stat-label {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            font-family: var(--font-body);
            cursor: pointer;
            border: none;
            transition: all var(--transition-base);
            text-align: center;
            justify-content: center;
        }

        .btn-primary {
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
        }

        .btn-primary:hover {
            background-color: #fff;
            box-shadow: 0 0 20px rgba(82, 229, 255, 0.4);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-secondary {
            background-color: transparent;
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .btn-secondary:hover {
            background-color: rgba(82, 229, 255, 0.1);
            box-shadow: 0 0 14px rgba(82, 229, 255, 0.2);
        }

        .btn-text {
            background: none;
            border: none;
            color: var(--accent-cyan);
            font-size: 14px;
            font-weight: 500;
            padding: 6px 0;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition-fast);
        }

        .btn-text .arrow {
            transition: transform var(--transition-fast);
        }

        .btn-text:hover .arrow {
            transform: translateX(4px);
        }

        /* Section base */
        .section {
            padding: var(--section-space) 0;
        }

        .section-alt {
            background-color: rgba(26, 34, 54, 0.4);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .section-header {
            margin-bottom: 40px;
        }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-cyan);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 10px;
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
        }

        /* Feature Grid - 非对称 */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(12, 1fr);
            gap: 20px;
        }

        .feature-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
            grid-column: span 4;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.3);
        }

        .feature-card.large {
            grid-column: span 8;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            align-items: center;
        }

        .feature-card.compact {
            grid-column: span 4;
            padding: 18px 20px;
        }

        .feature-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: rgba(82, 229, 255, 0.1);
            border: 1px solid rgba(82, 229, 255, 0.25);
            color: var(--accent-cyan);
            font-size: 1.2rem;
            margin-bottom: 14px;
        }

        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
            font-family: var(--font-heading);
        }

        .feature-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        .feature-card .card-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            height: 100%;
            min-height: 180px;
        }

        .feature-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Scenes */
        .scene-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .scene-block {
            display: grid;
            grid-template-columns: 1fr 1.4fr;
            gap: 32px;
            align-items: center;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
        }

        .scene-block:hover {
            border-color: rgba(82, 229, 255, 0.25);
            box-shadow: var(--shadow-card);
        }

        .scene-block:nth-child(even) {
            grid-template-columns: 1.4fr 1fr;
        }

        .scene-block:nth-child(even) .scene-img {
            order: 2;
        }

        .scene-img {
            border-radius: var(--radius-md);
            overflow: hidden;
            min-height: 200px;
        }

        .scene-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .scene-block h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 10px;
            font-family: var(--font-heading);
        }

        .scene-block p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .scene-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--accent-amber);
            background-color: rgba(255, 180, 84, 0.1);
            border: 1px solid rgba(255, 180, 84, 0.25);
            padding: 3px 10px;
            border-radius: 14px;
            margin-bottom: 10px;
            font-weight: 500;
        }

        /* Case Cards */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .case-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            transition: all var(--transition-base);
            cursor: pointer;
        }

        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.4);
        }

        .case-metric {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent-amber);
            font-family: var(--font-heading);
            line-height: 1.1;
        }

        .case-metric span {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
        }

        .case-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .case-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex-grow: 1;
        }

        .case-tag {
            display: inline-block;
            font-size: 12px;
            color: var(--accent-cyan);
            background-color: rgba(82, 229, 255, 0.08);
            padding: 4px 12px;
            border-radius: 14px;
            align-self: flex-start;
            font-weight: 500;
        }

        /* News Section */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .news-item {
            display: grid;
            grid-template-columns: 70px 1fr auto;
            gap: 20px;
            padding: 20px 16px;
            border-bottom: 1px solid var(--border-light);
            align-items: center;
            transition: background-color var(--transition-fast);
            border-radius: var(--radius-sm);
        }

        .news-item:hover {
            background-color: rgba(255, 255, 255, 0.03);
        }

        .news-date {
            text-align: center;
            font-family: var(--font-heading);
        }

        .news-date .month {
            display: block;
            font-size: 0.85rem;
            color: var(--accent-cyan);
            font-weight: 600;
        }

        .news-date .day {
            display: block;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.1;
        }

        .news-content h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .news-content p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .faq-item:hover {
            background-color: rgba(26, 34, 54, 0.8);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            gap: 12px;
            user-select: none;
        }

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background-color: rgba(82, 229, 255, 0.1);
            border: 1px solid rgba(82, 229, 255, 0.2);
            color: var(--accent-cyan);
            font-size: 14px;
            transition: all var(--transition-fast);
        }

        .faq-item.open .faq-icon {
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base), padding var(--transition-base);
            padding: 0 20px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        /* Pricing */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .pricing-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            display: flex;
            flex-direction: column;
            gap: 14px;
            transition: all var(--transition-base);
            position: relative;
        }

        .pricing-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }

        .pricing-card.featured {
            border-color: var(--accent-amber);
            box-shadow: 0 0 24px rgba(255, 180, 84, 0.15);
        }

        .pricing-card.featured::before {
            content: '推荐';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--accent-amber);
            color: var(--bg-primary);
            font-size: 12px;
            font-weight: 700;
            padding: 3px 14px;
            border-radius: 14px;
            letter-spacing: 0.5px;
        }

        .pricing-name {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-muted);
        }

        .pricing-price {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-primary);
            font-family: var(--font-heading);
            line-height: 1.1;
        }

        .pricing-price span {
            font-size: 0.9rem;
            font-weight: 400;
            color: var(--text-muted);
        }

        .pricing-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex-grow: 1;
        }

        .pricing-features li {
            font-size: 0.88rem;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .pricing-features li::before {
            content: '✓';
            color: var(--accent-cyan);
            font-weight: 700;
            flex-shrink: 0;
        }

        /* Data Analysis */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .data-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 20px;
            text-align: center;
        }

        .data-card .data-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent-amber);
            font-family: var(--font-heading);
        }

        .data-card .data-label {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Screenshot Stage */
        .screenshot-stage {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
        }

        .stage-main-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 280px;
            border: 1px solid var(--border-card);
        }

        .stage-main-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .stage-thumbs {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
        }

        .stage-thumb {
            border-radius: var(--radius-sm);
            overflow: hidden;
            cursor: pointer;
            border: 2px solid transparent;
            transition: border-color var(--transition-fast);
            aspect-ratio: 16/10;
        }

        .stage-thumb:hover,
        .stage-thumb.active {
            border-color: var(--accent-cyan);
        }

        .stage-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .stage-info h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 10px;
            font-family: var(--font-heading);
        }

        .stage-info p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Brand Intro */
        .brand-intro {
            display: grid;
            grid-template-columns: 1fr 1.4fr;
            gap: 40px;
            align-items: center;
        }

        .brand-intro .brand-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 260px;
        }

        .brand-intro .brand-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .brand-intro h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 16px;
            font-family: var(--font-heading);
        }

        .brand-intro p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.9;
            margin-bottom: 10px;
        }

        /* Form */
        .form-section {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 32px;
            display: grid;
            grid-template-columns: 1fr 1.4fr;
            gap: 32px;
        }

        .form-info h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 12px;
            font-family: var(--font-heading);
        }

        .form-info p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .form-group input,
        .form-group textarea,
        .form-group select {
            background-color: rgba(10, 14, 26, 0.6);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: var(--text-primary);
            font-size: 14px;
            font-family: var(--font-body);
            transition: border-color var(--transition-fast);
            width: 100%;
        }

        .form-group input::placeholder,
        .form-group textarea::placeholder {
            color: var(--text-muted);
        }

        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: var(--accent-cyan);
            outline: none;
        }

        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }

        /* Guarantee */
        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }

        .guarantee-item {
            text-align: center;
            padding: 20px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
        }

        .guarantee-item .g-icon {
            font-size: 1.8rem;
            color: var(--accent-cyan);
            margin-bottom: 10px;
        }

        .guarantee-item h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .guarantee-item p {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Partners */
        .partner-row {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 24px;
            align-items: center;
            justify-content: center;
        }

        .partner-chip {
            padding: 8px 18px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-muted);
            transition: all var(--transition-fast);
        }

        .partner-chip:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-footer);
            border-top: 1px solid var(--border-light);
            padding: 48px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand .logo {
            font-size: 1.1rem;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 14px;
            color: var(--text-primary);
            font-family: var(--font-heading);
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col a {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            font-size: 12px;
            color: var(--text-muted);
        }

        .footer-bottom .links {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .footer-bottom a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .footer-bottom a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-space: 72px;
            }

            .hero-content {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }

            .feature-card.large {
                grid-column: span 12;
                grid-template-columns: 1fr;
            }

            .feature-card.compact {
                grid-column: span 6;
            }

            .feature-card {
                grid-column: span 6;
            }

            .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .pricing-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .screenshot-stage {
                grid-template-columns: 1fr;
            }

            .brand-intro {
                grid-template-columns: 1fr;
            }

            .form-section {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }

            .guarantee-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .scene-block,
            .scene-block:nth-child(even) {
                grid-template-columns: 1fr;
            }

            .scene-block:nth-child(even) .scene-img {
                order: 0;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-space: 56px;
            }

            body {
                font-size: 15px;
            }

            .main-nav {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .hero-section {
                min-height: auto;
                padding: 40px 0 32px;
            }

            .hero-title {
                font-size: 1.8rem;
            }

            .hero-desc {
                font-size: 0.95rem;
            }

            .section-title {
                font-size: 1.5rem;
            }

            .feature-card,
            .feature-card.compact,
            .feature-card.large {
                grid-column: span 12;
            }

            .feature-card.large {
                grid-template-columns: 1fr;
            }

            .case-grid {
                grid-template-columns: 1fr;
            }

            .pricing-grid {
                grid-template-columns: 1fr;
            }

            .data-grid {
                grid-template-columns: 1fr 1fr;
            }

            .news-item {
                grid-template-columns: 52px 1fr;
                gap: 12px;
                padding: 14px 8px;
            }

            .news-item .btn-text {
                grid-column: 1 / -1;
            }

            .stage-thumbs {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .guarantee-grid {
                grid-template-columns: 1fr;
            }

            .hero-stats {
                grid-template-columns: repeat(4, 1fr);
                gap: 8px;
                padding: 16px 12px;
            }

            .hero-stat-number {
                font-size: 1.1rem;
            }

            .hero-stat-label {
                font-size: 10px;
            }

            .hero-actions {
                gap: 10px;
            }

            .btn {
                padding: 8px 16px;
                font-size: 13px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .hero-title {
                font-size: 1.5rem;
            }

            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }

            .section-title {
                font-size: 1.3rem;
            }

            .data-grid {
                grid-template-columns: 1fr;
            }

            .stage-thumbs {
                grid-template-columns: 1fr 1fr;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 72px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }
        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }
        .main-nav a {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
        }
        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }
        .main-nav a.active {
            color: var(--accent-cyan);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }
        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }
        .main-nav a:not(.active):hover::after {
            left: 12px;
            width: calc(100% - 24px);
        }
        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 18px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
        }
        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }
        .nav-cta::after {
            display: none !important;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }

        /* Hero */
        .service-hero {
            padding: 48px 0 56px;
            background: radial-gradient(ellipse at 70% 20%, rgba(123, 92, 255, 0.12) 0%, rgba(10, 14, 26, 0) 55%), radial-gradient(ellipse at 25% 80%, rgba(82, 229, 255, 0.08) 0%, rgba(10, 14, 26, 0) 50%);
            border-bottom: 1px solid var(--border-light);
        }
        .service-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(82, 229, 255, 0.1);
            color: var(--accent-cyan);
            font-size: 13px;
            padding: 6px 14px;
            border-radius: 20px;
            border: 1px solid rgba(82, 229, 255, 0.2);
            margin-bottom: 20px;
            font-weight: 500;
        }
        .service-hero h1 {
            font-family: var(--font-heading);
            font-size: 34px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .service-hero h1 .highlight {
            color: var(--accent-cyan);
        }
        .service-hero .hero-desc {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .hero-cta-group {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            align-items: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
            font-weight: 600;
            font-size: 15px;
            padding: 12px 26px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .btn-primary:hover {
            background-color: #fff;
            box-shadow: 0 0 20px rgba(82, 229, 255, 0.45);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 0 12px rgba(82, 229, 255, 0.3);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 15px;
            padding: 12px 26px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--accent-cyan);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .btn-secondary:hover {
            background-color: rgba(82, 229, 255, 0.1);
            box-shadow: 0 0 14px rgba(82, 229, 255, 0.25);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
            box-shadow: none;
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            margin-top: 36px;
            border-top: 1px solid var(--border-light);
            padding-top: 24px;
        }
        .hero-stat {
            text-align: left;
            padding: 0 16px;
            border-right: 1px solid var(--border-light);
        }
        .hero-stat:first-child {
            padding-left: 0;
        }
        .hero-stat:last-child {
            border-right: none;
        }
        .hero-stat .stat-number {
            font-family: var(--font-heading);
            font-size: 28px;
            font-weight: 700;
            color: var(--accent-amber);
            line-height: 1.3;
        }
        .hero-stat .stat-label {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Section general */
        .section {
            padding: var(--section-space) 0;
        }
        .section-title {
            font-family: var(--font-heading);
            font-size: 28px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.7;
            margin-bottom: 32px;
        }

        /* Cards */
        .service-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.25);
        }
        .service-card .card-icon {
            width: 42px;
            height: 42px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--accent-cyan);
            background: rgba(82, 229, 255, 0.1);
            margin-bottom: 14px;
        }
        .service-card h3 {
            font-family: var(--font-heading);
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .service-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Feature block */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
            background: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 32px;
            margin-bottom: 28px;
        }
        .feature-block .feature-content h3 {
            font-family: var(--font-heading);
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.4;
        }
        .feature-block .feature-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 10px;
        }
        .feature-block .feature-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: rgba(255, 255, 255, 0.03);
        }
        .feature-block .feature-image img {
            width: 100%;
            height: 240px;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }
        .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }
        .tag {
            font-size: 12px;
            color: var(--accent-cyan);
            background: rgba(82, 229, 255, 0.08);
            padding: 4px 10px;
            border-radius: 20px;
            border: 1px solid rgba(82, 229, 255, 0.2);
            font-weight: 500;
        }

        /* Process steps */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }
        .process-step {
            background: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 22px;
            transition: all var(--transition-base);
            position: relative;
        }
        .process-step:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-card);
            border-color: rgba(82, 229, 255, 0.2);
        }
        .process-step .step-number {
            font-family: var(--font-heading);
            font-size: 36px;
            font-weight: 800;
            color: rgba(82, 229, 255, 0.35);
            margin-bottom: 10px;
            line-height: 1;
        }
        .process-step h4 {
            font-family: var(--font-heading);
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .process-step p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            margin-bottom: 10px;
            overflow: hidden;
            transition: background var(--transition-fast);
        }
        .faq-item:hover {
            background: rgba(26, 34, 54, 0.9);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            cursor: pointer;
            color: var(--text-primary);
            font-size: 15px;
            font-weight: 500;
            text-align: left;
            font-family: var(--font-body);
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: #fff;
        }
        .faq-question.active {
            color: #fff;
        }
        .faq-question .faq-icon {
            font-size: 18px;
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-question.active .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base), padding var(--transition-base);
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 20px 18px 20px;
        }

        /* CTA section */
        .cta-section {
            background: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            text-align: center;
        }
        .cta-section h2 {
            font-family: var(--font-heading);
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-footer);
            border-top: 1px solid var(--border-light);
            padding: 40px 0 24px;
            margin-top: 64px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 280px;
            margin-top: 10px;
        }
        .footer-col h4 {
            font-family: var(--font-heading);
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            border-top: 1px solid var(--border-light);
            padding-top: 18px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .footer-bottom .links {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .footer-bottom .links a {
            color: var(--text-muted);
            font-size: 12px;
            transition: color var(--transition-fast);
        }
        .footer-bottom .links a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .hero-stat {
                border-right: none;
                padding: 0;
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-block {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                background-color: rgba(10, 14, 26, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 16px 24px;
                border-bottom: 1px solid var(--border-light);
                display: none;
                z-index: 99;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 14px 12px;
                font-size: 15px;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active::after {
                left: 0;
                right: auto;
                width: 3px;
                height: 100%;
                top: 0;
                bottom: auto;
                border-radius: 0;
                box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
            }
            .main-nav a:not(.active)::after {
                display: none;
            }
            .main-nav a.active {
                background-color: rgba(82, 229, 255, 0.06);
                padding-left: 16px;
            }
            .nav-cta {
                margin-top: 8px;
                text-align: center;
            }
            .service-hero {
                padding: 32px 0 40px;
            }
            .service-hero h1 {
                font-size: 26px;
            }
            .service-hero .hero-desc {
                font-size: 15px;
            }
            .section-title {
                font-size: 23px;
            }
            .section {
                padding: 48px 0;
            }
            :root {
                --section-space: 48px;
            }
            .hero-stats {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom .links {
                justify-content: center;
            }
            .cta-section h2 {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            .service-hero h1 {
                font-size: 22px;
            }
            .hero-cta-group {
                flex-direction: column;
                gap: 10px;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .hero-stat .stat-number {
                font-size: 22px;
            }
            .section-title {
                font-size: 20px;
            }
            .container {
                padding: 0 16px;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 72px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }

        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 2px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: thin;
            scrollbar-color: var(--bg-secondary) transparent;
        }

        .main-nav::-webkit-scrollbar {
            height: 3px;
        }
        .main-nav::-webkit-scrollbar-track {
            background: transparent;
        }
        .main-nav::-webkit-scrollbar-thumb {
            background: var(--bg-secondary);
            border-radius: 3px;
        }

        .main-nav a {
            position: relative;
            padding: 8px 10px;
            font-size: 13.5px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }

        .main-nav a.active {
            color: var(--accent-cyan);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 10px;
            right: 10px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }

        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }

        .main-nav a:not(.active):hover::after {
            left: 10px;
            width: calc(100% - 20px);
        }

        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 16px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
            flex-shrink: 0;
        }

        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }

        .nav-cta::after {
            display: none !important;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }

        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-drawer {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(10, 14, 26, 0.98);
            z-index: 90;
            padding: 20px 24px;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .mobile-drawer.open {
            display: flex;
        }

        .mobile-drawer a {
            padding: 14px 16px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: 10px;
            min-height: 48px;
        }

        .mobile-drawer a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.05);
        }

        .mobile-drawer a.active {
            color: var(--accent-cyan);
            border-left: 3px solid var(--accent-cyan);
            padding-left: 13px;
        }

        /* Section Common */
        .section {
            padding: var(--section-space) 0;
        }

        .section-alt {
            background-color: var(--bg-secondary);
        }

        .section-title {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 28px;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 720px;
            margin-bottom: 36px;
        }

        /* Hero Category */
        .category-hero {
            position: relative;
            background: radial-gradient(ellipse at top right, rgba(123, 92, 255, 0.12), transparent 45%), radial-gradient(ellipse at bottom left, rgba(82, 229, 255, 0.08), transparent 40%), var(--bg-primary);
            padding: 56px 0 48px;
            border-bottom: 1px solid var(--border-light);
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(82, 229, 255, 0.06), transparent 60%);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 1;
        }

        .category-hero h1 {
            font-family: var(--font-heading);
            font-size: 38px;
            font-weight: 800;
            line-height: 1.35;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .category-hero h1 .highlight {
            color: var(--accent-cyan);
        }

        .category-hero .hero-desc {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.85;
            max-width: 680px;
            margin-bottom: 28px;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
            font-weight: 600;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            background-color: #fff;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.35);
            transform: translateY(-1px);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: transparent;
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            font-weight: 500;
            padding: 9px 20px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            transition: all var(--transition-fast);
            cursor: pointer;
        }

        .btn-secondary:hover {
            background-color: rgba(82, 229, 255, 0.1);
            box-shadow: 0 0 12px rgba(82, 229, 255, 0.2);
            transform: translateY(-1px);
        }

        .btn-text {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent-cyan);
            font-weight: 500;
            font-size: 14px;
            transition: all var(--transition-fast);
        }

        .btn-text i {
            transition: transform var(--transition-fast);
        }

        .btn-text:hover {
            color: #fff;
        }
        .btn-text:hover i {
            transform: translateX(3px);
        }

        /* Cards */
        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.25);
        }

        /* Stats */
        .stat-block {
            display: flex;
            align-items: baseline;
            gap: 8px;
        }
        .stat-number {
            font-size: 38px;
            font-weight: 800;
            color: var(--accent-amber);
            font-family: var(--font-heading);
            line-height: 1;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* Tag */
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 12px;
            font-weight: 500;
            padding: 3px 10px;
            border-radius: 20px;
            background-color: rgba(82, 229, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid rgba(82, 229, 255, 0.2);
            white-space: nowrap;
        }
        .tag-amber {
            background-color: rgba(255, 180, 84, 0.1);
            color: var(--accent-amber);
            border-color: rgba(255, 180, 84, 0.25);
        }
        .tag-purple {
            background-color: rgba(123, 92, 255, 0.12);
            color: var(--accent-purple);
            border-color: rgba(123, 92, 255, 0.25);
        }

        /* Resource grid */
        .resource-card {
            background-color: var(--bg-primary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 20px;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .resource-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.3);
        }
        .resource-card .resource-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-md);
            background-color: rgba(82, 229, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--accent-cyan);
            flex-shrink: 0;
        }
        .resource-card h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            font-family: var(--font-heading);
            line-height: 1.4;
        }
        .resource-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex-grow: 1;
        }

        /* Timeline */
        .timeline {
            position: relative;
            padding-left: 24px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 6px;
            top: 0;
            bottom: 0;
            width: 2px;
            background-color: var(--border-light);
            border-radius: 1px;
        }
        .timeline-item {
            position: relative;
            padding-bottom: 28px;
            padding-left: 22px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -19px;
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--accent-cyan);
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
            border: 2px solid var(--bg-primary);
        }
        .timeline-item:last-child {
            padding-bottom: 0;
        }
        .timeline-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .timeline-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            background-color: rgba(26, 34, 54, 0.85);
            border-color: rgba(255, 255, 255, 0.12);
        }
        .faq-question {
            padding: 16px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 15px;
            color: var(--text-primary);
            gap: 12px;
            user-select: none;
            transition: all var(--transition-fast);
        }
        .faq-question:hover {
            color: #fff;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 20px 16px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* CTA */
        .cta-box {
            background-color: var(--bg-secondary);
            border: 1px solid rgba(82, 229, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -60px;
            left: 50%;
            transform: translateX(-50%);
            width: 300px;
            height: 200px;
            background: radial-gradient(ellipse, rgba(82, 229, 255, 0.08), transparent 60%);
            pointer-events: none;
            border-radius: 50%;
        }
        .cta-box h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            font-family: var(--font-heading);
            margin-bottom: 10px;
            position: relative;
        }
        .cta-box p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 22px;
            position: relative;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-footer);
            border-top: 1px solid var(--border-light);
            padding: 40px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.4fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-top: 12px;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            font-family: var(--font-heading);
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 12px;
            color: var(--text-muted);
        }
        .footer-bottom .links {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .footer-bottom .links a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-bottom .links a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --section-space: 56px;
            }
            .category-hero h1 {
                font-size: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .main-nav a {
                padding: 8px 8px;
                font-size: 13px;
            }
            .nav-cta {
                padding: 8px 12px !important;
                font-size: 13px !important;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-space: 44px;
            }
            .site-header {
                height: 60px;
            }
            .mobile-drawer {
                top: 60px;
            }
            .main-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .category-hero {
                padding: 36px 0 32px;
            }
            .category-hero h1 {
                font-size: 26px;
            }
            .category-hero .hero-desc {
                font-size: 15px;
            }
            .section-title {
                font-size: 22px;
            }
            .section-subtitle {
                font-size: 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                text-align: left;
            }
            .cta-box {
                padding: 28px 18px;
            }
            .cta-box h2 {
                font-size: 20px;
            }
            .stat-number {
                font-size: 28px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 8px 16px;
                font-size: 14px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-hero h1 {
                font-size: 22px;
            }
            .category-hero .hero-desc {
                font-size: 14px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
            .section-title {
                font-size: 20px;
            }
            .faq-question {
                font-size: 14px;
                padding: 12px 14px;
            }
            .faq-answer {
                padding: 0 14px 12px;
                font-size: 13px;
            }
            .resource-card {
                padding: 16px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 96px;
        }

        @media (max-width: 768px) {
            :root {
                --section-space: 56px;
            }
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }

        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }

        .main-nav a {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }

        .main-nav a.active {
            color: var(--accent-cyan);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }

        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }

        .main-nav a:not(.active):hover::after {
            left: 12px;
            width: calc(100% - 24px);
        }

        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 18px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
        }

        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }

        .nav-cta::after {
            display: none !important;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 1px;
            transition: all var(--transition-base);
            transform-origin: center;
        }

        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Section base */
        .section {
            padding: var(--section-space) 0;
            position: relative;
        }

        .section-alt {
            background-color: var(--bg-secondary);
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.75;
        }

        .section-head {
            margin-bottom: 40px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
        }

        .btn-primary:hover {
            background-color: #fff;
            color: var(--bg-primary);
            box-shadow: 0 0 20px rgba(82, 229, 255, 0.45);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 0 12px rgba(82, 229, 255, 0.3);
        }

        .btn-secondary {
            background: transparent;
            color: var(--accent-cyan);
            border: 1px solid var(--accent-cyan);
        }

        .btn-secondary:hover {
            background-color: rgba(82, 229, 255, 0.1);
            color: var(--text-primary);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(0);
            background-color: rgba(82, 229, 255, 0.15);
        }

        .btn-text {
            background: none;
            border: none;
            padding: 4px 0;
            color: var(--accent-cyan);
            font-weight: 500;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            cursor: pointer;
        }

        .btn-text .arrow {
            transition: transform var(--transition-fast);
        }

        .btn-text:hover .arrow {
            transform: translateX(3px);
        }

        /* Cards */
        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.3);
        }

        /* Hero - comparison style */
        .hero-solutions {
            position: relative;
            padding: 56px 0 72px;
            background:
                radial-gradient(ellipse at 80% 10%, rgba(123, 92, 255, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 15% 85%, rgba(82, 229, 255, 0.06) 0%, transparent 45%),
                var(--bg-primary);
            overflow: hidden;
        }

        .hero-solutions::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            pointer-events: none;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 48px 48px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background-color: rgba(82, 229, 255, 0.12);
            border: 1px solid rgba(82, 229, 255, 0.25);
            color: var(--accent-cyan);
            font-size: 0.8rem;
            font-weight: 500;
            padding: 4px 14px;
            border-radius: 99px;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }

        .hero-title {
            font-family: var(--font-heading);
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .hero-title .highlight {
            color: var(--accent-cyan);
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 580px;
            margin-bottom: 32px;
            line-height: 1.75;
        }

        /* Comparison cards in hero */
        .compare-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
            margin-top: 40px;
        }

        .compare-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            position: relative;
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }

        .compare-card:hover {
            border-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .compare-card.recommended {
            border: 2px solid var(--accent-amber);
            box-shadow: 0 0 0 1px rgba(255, 180, 84, 0.25), 0 8px 32px rgba(0, 0, 0, 0.45);
            transform: scale(1.03);
            z-index: 2;
        }

        .compare-card.recommended:hover {
            transform: scale(1.03) translateY(-4px);
            box-shadow: 0 0 0 1px rgba(255, 180, 84, 0.35), 0 14px 44px rgba(0, 0, 0, 0.55);
        }

        .recommended-badge {
            position: absolute;
            top: -13px;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--accent-amber);
            color: #1a1a1a;
            font-size: 0.72rem;
            font-weight: 700;
            padding: 3px 14px;
            border-radius: 99px;
            letter-spacing: 1px;
            white-space: nowrap;
            box-shadow: 0 2px 12px rgba(255, 180, 84, 0.4);
        }

        .compare-plan-name {
            font-family: var(--font-heading);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .compare-plan-price {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .compare-plan-price .unit {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
        }

        .compare-plan-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            line-height: 1.6;
        }

        .compare-features {
            list-style: none;
            padding: 0;
            margin: 0 0 20px;
            flex-grow: 1;
        }

        .compare-features li {
            font-size: 0.85rem;
            color: var(--text-secondary);
            padding: 6px 0;
            display: flex;
            align-items: flex-start;
            gap: 8px;
            line-height: 1.55;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .compare-features li:last-child {
            border-bottom: none;
        }

        .compare-features li .fa-check {
            color: var(--accent-cyan);
            font-size: 0.75rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        .compare-features li .fa-minus {
            color: var(--text-muted);
            font-size: 0.75rem;
            margin-top: 4px;
            flex-shrink: 0;
        }

        .compare-features li.muted {
            color: var(--text-muted);
            opacity: 0.6;
        }

        .compare-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            width: 100%;
            text-align: center;
        }

        .compare-btn.btn-ghost {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-light);
        }

        .compare-btn.btn-ghost:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background-color: rgba(82, 229, 255, 0.06);
        }

        .compare-btn.btn-highlight {
            background-color: var(--accent-amber);
            color: #1a1a1a;
        }

        .compare-btn.btn-highlight:hover {
            background-color: #ffd08a;
            box-shadow: 0 0 20px rgba(255, 180, 84, 0.4);
            transform: translateY(-1px);
        }

        .compare-btn.btn-cyan {
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
        }

        .compare-btn.btn-cyan:hover {
            background-color: #fff;
            box-shadow: 0 0 20px rgba(82, 229, 255, 0.4);
            transform: translateY(-1px);
        }

        /* Deep content area */
        .deep-content {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            margin-bottom: 32px;
            transition: border-color var(--transition-base);
        }

        .deep-content:hover {
            border-color: rgba(255, 255, 255, 0.12);
        }

        .deep-content h3 {
            font-family: var(--font-heading);
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            line-height: 1.45;
        }

        .deep-content p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.85;
            margin-bottom: 14px;
            max-width: 760px;
        }

        .deep-content p:last-child {
            margin-bottom: 0;
        }

        .deep-content .highlight-text {
            color: var(--accent-cyan);
            font-weight: 500;
        }

        /* Scenario grid - asymmetric */
        .scenario-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            grid-template-rows: auto auto;
            gap: 20px;
        }

        .scenario-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .scenario-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.25);
        }

        .scenario-item.large {
            grid-row: span 2;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .scenario-item img {
            margin-bottom: 16px;
            aspect-ratio: 16/9;
            object-fit: cover;
            width: 100%;
            border-radius: var(--radius-md);
        }

        .scenario-item h4 {
            font-family: var(--font-heading);
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .scenario-item p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .scenario-tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 500;
            color: var(--accent-cyan);
            background-color: rgba(82, 229, 255, 0.1);
            padding: 2px 10px;
            border-radius: 99px;
            margin-bottom: 10px;
            letter-spacing: 0.5px;
        }

        /* Process steps */
        .process-horizontal {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
            counter-reset: step;
        }

        .process-step {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 20px 16px;
            text-align: left;
            position: relative;
            transition: all var(--transition-base);
            counter-increment: step;
        }

        .process-step:hover {
            border-color: rgba(82, 229, 255, 0.3);
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .process-step::before {
            content: counter(step, decimal-leading-zero);
            font-family: var(--font-heading);
            font-size: 1.8rem;
            font-weight: 800;
            color: rgba(82, 229, 255, 0.25);
            display: block;
            margin-bottom: 8px;
            line-height: 1;
        }

        .process-step h4 {
            font-family: var(--font-heading);
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .process-step p {
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Metrics wall */
        .metrics-wall {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .metric-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
            transition: all var(--transition-base);
        }

        .metric-item:hover {
            border-color: rgba(82, 229, 255, 0.25);
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .metric-value {
            font-family: var(--font-heading);
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--accent-amber);
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .metric-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .metric-note {
            font-size: 0.75rem;
            color: var(--text-muted);
            opacity: 0.7;
            margin-top: 4px;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            padding: 0;
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .faq-item:hover {
            background-color: rgba(26, 34, 54, 0.85);
            border-color: rgba(255, 255, 255, 0.1);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--font-body);
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            transition: color var(--transition-fast);
        }

        .faq-question:hover {
            color: var(--accent-cyan);
        }

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            color: var(--text-muted);
            transition: all var(--transition-fast);
        }

        .faq-item.open .faq-icon {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.75;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        .faq-answer p {
            margin: 0;
        }

        /* CTA */
        .cta-section {
            background:
                radial-gradient(ellipse at 50% 120%, rgba(82, 229, 255, 0.08) 0%, transparent 50%),
                rgba(26, 34, 54, 0.6);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-title {
            font-family: var(--font-heading);
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .cta-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 520px;
            margin: 0 auto 28px;
            line-height: 1.75;
        }

        .cta-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background-color: var(--bg-footer);
            border-top: 1px solid var(--border-light);
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-top: 12px;
            max-width: 280px;
        }

        .footer-col h4 {
            font-family: var(--font-heading);
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a,
        .footer-col ul li span {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            border-top: 1px solid var(--border-light);
            padding-top: 20px;
            font-size: 0.78rem;
            color: var(--text-muted);
        }

        .footer-bottom .links {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .footer-bottom .links a {
            color: var(--text-muted);
        }

        .footer-bottom .links a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .compare-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
            .scenario-grid {
                grid-template-columns: 1fr 1fr;
            }
            .scenario-item.large {
                grid-column: span 2;
                grid-row: auto;
            }
            .process-horizontal {
                grid-template-columns: repeat(3, 1fr);
            }
            .metrics-wall {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-title {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background-color: rgba(10, 14, 26, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px;
                gap: 0;
                border-bottom: 1px solid var(--border-light);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 14px 12px;
                font-size: 1rem;
                width: 100%;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active::after {
                left: 8px;
                right: 8px;
            }
            .main-nav a:not(.active)::after {
                display: none;
            }
            .main-nav a.nav-cta {
                margin-top: 8px;
                text-align: center;
                justify-content: center;
            }
            .hamburger {
                display: flex;
            }
            .compare-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .compare-card.recommended {
                transform: scale(1);
            }
            .compare-card.recommended:hover {
                transform: translateY(-4px);
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .scenario-item.large {
                grid-column: auto;
            }
            .process-horizontal {
                grid-template-columns: 1fr;
            }
            .metrics-wall {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .section {
                padding: 48px 0;
            }
            .cta-section {
                padding: 32px 20px;
            }
            .cta-title {
                font-size: 1.4rem;
            }
            .deep-content {
                padding: 24px 18px;
            }
            .deep-content h3 {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-title {
                font-size: 1.5rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .compare-plan-price {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .cta-actions {
                flex-direction: column;
                width: 100%;
            }
            .cta-actions .btn {
                width: 100%;
            }
            .compare-btn {
                font-size: 0.85rem;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 72px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }
        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }
        .main-nav a {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
        }
        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }
        .main-nav a.active {
            color: var(--accent-cyan);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }
        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }
        .main-nav a:not(.active):hover::after {
            left: 12px;
            width: calc(100% - 24px);
        }
        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 18px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
        }
        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }
        .nav-cta::after {
            display: none !important;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-fast);
        }
        .hamburger span.active:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger span.active:nth-child(2) {
            opacity: 0;
        }
        .hamburger span.active:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
            font-weight: 600;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            font-size: 15px;
        }
        .btn-primary:hover {
            background-color: #fff;
            color: var(--bg-primary);
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--accent-cyan);
            font-weight: 600;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--accent-cyan);
            transition: all var(--transition-fast);
            cursor: pointer;
            font-size: 15px;
        }
        .btn-secondary:hover {
            background-color: rgba(82, 229, 255, 0.1);
            color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(82, 229, 255, 0.25);
        }
        .btn-secondary:active {
            background-color: rgba(82, 229, 255, 0.18);
        }

        .section {
            padding: var(--section-space) 0;
        }
        .section-alt {
            background-color: var(--bg-secondary);
        }
        .section-title {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.4;
            margin-bottom: 16px;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 720px;
        }
        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-cyan);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }

        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.3);
            transform: translateY(-3px);
        }

        .badge {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            background-color: rgba(82, 229, 255, 0.12);
            color: var(--accent-cyan);
            border: 1px solid rgba(82, 229, 255, 0.25);
        }
        .badge-amber {
            background-color: rgba(255, 180, 84, 0.12);
            color: var(--accent-amber);
            border: 1px solid rgba(255, 180, 84, 0.25);
        }

        .stat-number {
            font-family: var(--font-heading);
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-amber);
            line-height: 1.2;
        }

        .divider {
            height: 1px;
            background-color: var(--border-light);
            border: none;
            margin: 0;
        }

        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: background-color var(--transition-fast);
            background-color: var(--bg-secondary);
        }
        .faq-item:hover {
            background-color: rgba(255, 255, 255, 0.04);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            user-select: none;
        }
        .faq-question:hover {
            color: var(--accent-cyan);
        }
        .faq-question .faq-icon {
            font-size: 18px;
            color: var(--text-muted);
            transition: transform var(--transition-base);
            flex-shrink: 0;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--accent-cyan);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base) ease;
            padding: 0 20px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding-bottom: 18px;
        }

        .case-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-base);
        }
        .case-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: rgba(82, 229, 255, 0.35);
        }
        .case-card .case-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }
        .case-card .case-body {
            padding: 24px;
        }
        .case-card .case-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .case-card .case-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .case-card .case-stats {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .case-card .case-stat-item {
            font-size: 13px;
            color: var(--text-muted);
        }
        .case-card .case-stat-item strong {
            display: block;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--accent-amber);
            font-family: var(--font-heading);
        }

        .timeline-item {
            display: flex;
            gap: 20px;
            padding-bottom: 28px;
            position: relative;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 15px;
            top: 36px;
            bottom: 0;
            width: 2px;
            background-color: var(--border-light);
        }
        .timeline-item:last-child::before {
            display: none;
        }
        .timeline-dot {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background-color: var(--accent-cyan);
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            font-weight: 700;
            color: var(--bg-primary);
            z-index: 1;
            box-shadow: 0 0 12px rgba(82, 229, 255, 0.4);
        }
        .timeline-content h4 {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .timeline-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .site-footer {
            background-color: var(--bg-footer);
            border-top: 1px solid var(--border-light);
            padding: 56px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-top: 12px;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 20px;
            border-top: 1px solid var(--border-light);
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom .links {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .footer-bottom .links a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-bottom .links a:hover {
            color: var(--accent-cyan);
        }

        @media (max-width: 1024px) {
            .main-nav a {
                padding: 8px 8px;
                font-size: 13px;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stat-number {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background-color: var(--bg-primary);
                border-bottom: 1px solid var(--border-light);
                padding: 16px 24px;
                gap: 0;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 14px 0;
                font-size: 15px;
                border-bottom: 1px solid var(--border-light);
                width: 100%;
                text-align: left;
                border-radius: 0;
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .main-nav a.active::after {
                display: none;
            }
            .main-nav a.active {
                border-left: 3px solid var(--accent-cyan);
                padding-left: 12px;
                background-color: rgba(82, 229, 255, 0.05);
            }
            .hamburger {
                display: flex;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                text-align: left;
            }
            .stat-number {
                font-size: 1.5rem;
            }
            .case-card .case-image {
                height: 160px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .btn-primary,
            .btn-secondary {
                padding: 8px 16px;
                font-size: 14px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 14px;
            }
            .case-card .case-body {
                padding: 16px;
            }
            .timeline-item {
                gap: 12px;
            }
            .timeline-dot {
                width: 26px;
                height: 26px;
                font-size: 11px;
            }
        }

/* roulang page: category5 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 80px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }
        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }
        .main-nav a {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
        }
        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }
        .main-nav a.active {
            color: var(--accent-cyan);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }
        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }
        .main-nav a:not(.active):hover::after {
            left: 12px;
            width: calc(100% - 24px);
        }
        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 18px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
        }
        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }
        .nav-cta::after {
            display: none !important;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
            font-weight: 600;
            padding: 12px 26px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            transition: all var(--transition-fast);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-primary:hover {
            background-color: #fff;
            color: var(--bg-primary);
            box-shadow: 0 0 20px rgba(82, 229, 255, 0.4);
            transform: translateY(-2px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--accent-cyan);
            font-weight: 600;
            padding: 11px 24px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            border: 1px solid var(--accent-cyan);
            cursor: pointer;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .btn-secondary:hover {
            background-color: rgba(82, 229, 255, 0.1);
            box-shadow: 0 0 14px rgba(82, 229, 255, 0.2);
            transform: translateY(-2px);
        }
        .section {
            padding: var(--section-space) 0;
        }
        .section-tight {
            padding: 48px 0;
        }
        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 28px;
            transition: all var(--transition-base);
        }
        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent-cyan);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
            letter-spacing: 0.3px;
            background-color: rgba(82, 229, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid rgba(82, 229, 255, 0.25);
        }
        .badge-amber {
            background-color: rgba(255, 180, 84, 0.1);
            color: var(--accent-amber);
            border-color: rgba(255, 180, 84, 0.25);
        }
        .stat-number {
            font-size: 36px;
            font-weight: 700;
            color: var(--accent-amber);
            font-family: var(--font-heading);
            line-height: 1.3;
        }
        .divider {
            border: none;
            border-top: 1px solid var(--border-light);
            margin: 24px 0;
        }
        .faq-item {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: background-color var(--transition-fast);
        }
        .faq-item:hover {
            background-color: rgba(26, 34, 54, 0.9);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            cursor: pointer;
            font-weight: 600;
            font-size: 15px;
            color: var(--text-primary);
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: #fff;
        }
        .faq-question .icon {
            font-size: 18px;
            color: var(--accent-cyan);
            flex-shrink: 0;
            transition: transform var(--transition-base);
            margin-left: 12px;
        }
        .faq-item.open .faq-question .icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base), padding var(--transition-base);
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 20px 18px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding: 48px 0 32px;
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 20px 0;
            border-top: 1px solid var(--border-light);
            font-size: 13px;
            color: var(--text-muted);
        }
        .site-footer {
            background-color: var(--bg-footer);
            border-top: 1px solid var(--border-light);
        }
        .site-footer h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul li a {
            font-size: 13px;
            color: var(--text-secondary);
            transition: color var(--transition-fast);
        }
        .site-footer ul li a:hover {
            color: var(--accent-cyan);
        }
        @media (max-width: 1024px) {
            .main-nav a {
                padding: 8px 8px;
                font-size: 13px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                bottom: 0;
                background-color: var(--bg-primary);
                flex-direction: column;
                align-items: flex-start;
                padding: 24px;
                gap: 4px;
                transform: translateX(100%);
                transition: transform var(--transition-base);
                overflow-y: auto;
                z-index: 99;
            }
            .main-nav.open {
                transform: translateX(0);
            }
            .main-nav a {
                width: 100%;
                padding: 14px 16px;
                font-size: 16px;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active::after {
                left: 16px;
                right: 16px;
            }
            .main-nav a:not(.active):hover::after {
                left: 16px;
                width: calc(100% - 32px);
            }
            .nav-cta {
                text-align: center;
                justify-content: center;
                margin-top: 8px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
            :root {
                --section-space: 56px;
            }
            .section {
                padding: 40px 0;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-title {
                font-size: 28px !important;
            }
            .hero-subtitle {
                font-size: 16px !important;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
                padding: 12px 20px;
                font-size: 14px;
            }
            .stat-number {
                font-size: 28px;
            }
        }
        .bg-radial-glow {
            background: radial-gradient(ellipse at 80% 20%, rgba(123, 92, 255, 0.12) 0%, rgba(10, 14, 26, 0.01) 55%),
                radial-gradient(ellipse at 15% 75%, rgba(82, 229, 255, 0.08) 0%, rgba(10, 14, 26, 0.01) 50%);
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .border-glow {
            border: 1px solid rgba(82, 229, 255, 0.3);
        }
        .hover-glow:hover {
            box-shadow: 0 0 18px rgba(82, 229, 255, 0.25);
            border-color: rgba(82, 229, 255, 0.5);
        }

/* roulang page: category6 */
:root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #1A2236;
            --bg-footer: #060910;
            --text-primary: #E8EDF5;
            --text-secondary: rgba(232, 237, 245, 0.75);
            --text-muted: #8A94A6;
            --accent-cyan: #52E5FF;
            --accent-purple: #7B5CFF;
            --accent-amber: #FFB454;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
            --transition-fast: 200ms ease;
            --transition-base: 260ms ease;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --container-max: 1200px;
            --section-space: 72px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: 68px;
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .logo-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent-cyan);
            border-radius: var(--radius-sm);
            transform: rotate(45deg);
            flex-shrink: 0;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.3);
        }

        .logo-icon span {
            transform: rotate(-45deg);
            font-size: 14px;
            color: var(--accent-cyan);
            font-weight: 700;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }

        .main-nav a {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast), background-color var(--transition-fast);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }

        .main-nav a.active {
            color: var(--accent-cyan);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 12px;
            right: 12px;
            height: 2px;
            background-color: var(--accent-cyan);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(82, 229, 255, 0.5);
        }

        .main-nav a:not(.active)::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--accent-cyan);
            transition: all var(--transition-base);
            border-radius: 1px;
            opacity: 0.4;
        }

        .main-nav a:not(.active):hover::after {
            left: 12px;
            width: calc(100% - 24px);
        }

        .nav-cta {
            background-color: var(--accent-cyan);
            color: var(--bg-primary) !important;
            font-weight: 600 !important;
            padding: 8px 18px !important;
            border-radius: var(--radius-sm) !important;
            transition: all var(--transition-fast) !important;
        }

        .nav-cta:hover {
            background-color: #fff !important;
            color: var(--bg-primary) !important;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
        }

        .nav-cta::after {
            display: none !important;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-primary);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(10, 14, 26, 0.98);
            z-index: 99;
            padding: 24px;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            display: flex;
            align-items: center;
            min-height: 48px;
            padding: 12px 16px;
            font-size: 15px;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            border-left: 3px solid transparent;
        }

        .mobile-menu a.active {
            color: var(--accent-cyan);
            border-left-color: var(--accent-cyan);
            background-color: rgba(82, 229, 255, 0.05);
        }

        .mobile-menu a:hover {
            color: #fff;
            background-color: rgba(255, 255, 255, 0.04);
        }

        .section {
            padding: var(--section-space) 0;
        }

        .section-sm {
            padding: 48px 0;
        }

        .section-title {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all var(--transition-fast);
            border: none;
            text-decoration: none;
        }

        .btn-primary {
            background-color: var(--accent-cyan);
            color: var(--bg-primary);
        }

        .btn-primary:hover {
            background-color: #fff;
            box-shadow: 0 0 16px rgba(82, 229, 255, 0.4);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .btn-outline:hover {
            background-color: rgba(82, 229, 255, 0.1);
            transform: translateY(-2px);
        }

        .btn-ghost {
            background: transparent;
            color: var(--accent-cyan);
            padding: 6px 0;
            gap: 4px;
        }

        .btn-ghost i {
            transition: transform var(--transition-fast);
        }

        .btn-ghost:hover i {
            transform: translateX(3px);
        }

        .card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: all var(--transition-base);
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(82, 229, 255, 0.25);
        }

        .tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
            background-color: rgba(82, 229, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid rgba(82, 229, 255, 0.2);
        }

        .tag-amber {
            background-color: rgba(255, 180, 84, 0.1);
            color: var(--accent-amber);
            border-color: rgba(255, 180, 84, 0.2);
        }

        .tag-purple {
            background-color: rgba(123, 92, 255, 0.1);
            color: var(--accent-purple);
            border-color: rgba(123, 92, 255, 0.2);
        }

        .divider {
            border: none;
            height: 1px;
            background-color: var(--border-light);
            margin: 24px 0;
        }

        .stat-number {
            font-family: var(--font-heading);
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--accent-amber);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* Hero category page */
        .hero-category {
            position: relative;
            padding: 64px 0 48px;
            background: radial-gradient(ellipse at top right, rgba(123, 92, 255, 0.12), transparent 55%), radial-gradient(ellipse at bottom left, rgba(82, 229, 255, 0.06), transparent 45%);
            border-bottom: 1px solid var(--border-light);
        }

        .hero-category .h1 {
            font-family: var(--font-heading);
            font-size: 2.5rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .hero-category .h1 em {
            font-style: normal;
            color: var(--accent-cyan);
        }

        .hero-category .lead {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.85;
        }

        /* Form styles */
        .form-input {
            width: 100%;
            background-color: rgba(10, 14, 26, 0.6);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color var(--transition-fast);
        }

        .form-input:focus {
            border-color: var(--accent-cyan);
            outline: none;
        }

        .form-input::placeholder {
            color: var(--text-muted);
        }

        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 6px;
        }

        /* FAQ accordion */
        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            background-color: var(--bg-secondary);
            margin-bottom: 12px;
            overflow: hidden;
            transition: background-color var(--transition-fast);
        }

        .faq-item:hover {
            background-color: rgba(26, 34, 54, 0.85);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            cursor: pointer;
            font-weight: 600;
            font-size: 15px;
            color: var(--text-primary);
            user-select: none;
            gap: 16px;
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            color: var(--accent-cyan);
            font-size: 16px;
            transition: transform var(--transition-fast);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base);
            padding: 0 20px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        .faq-answer p {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.8;
        }

        /* Timeline / steps */
        .step-item {
            display: flex;
            gap: 20px;
            position: relative;
            padding-bottom: 32px;
        }

        .step-item:not(:last-child)::before {
            content: '';
            position: absolute;
            left: 18px;
            top: 40px;
            bottom: 0;
            width: 1px;
            background-color: var(--border-light);
        }

        .step-number {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1.5px solid var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
            color: var(--accent-cyan);
            flex-shrink: 0;
            background-color: rgba(82, 229, 255, 0.05);
            box-shadow: 0 0 10px rgba(82, 229, 255, 0.2);
        }

        .step-body h4 {
            font-family: var(--font-heading);
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-primary);
        }

        .step-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* Site footer */
        .site-footer {
            background-color: var(--bg-footer);
            border-top: 1px solid var(--border-light);
            padding: 48px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            font-family: var(--font-heading);
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-col ul li {
            margin-bottom: 8px;
        }

        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 12px;
            color: var(--text-muted);
        }

        .footer-bottom .links {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .footer-bottom .links a {
            color: var(--text-muted);
        }

        .footer-bottom .links a:hover {
            color: var(--accent-cyan);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-nav a {
                padding: 8px 8px;
                font-size: 13px;
            }
            .main-nav a.nav-cta {
                padding: 8px 14px !important;
                font-size: 13px !important;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .hero-category .h1 {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero-category {
                padding: 40px 0 32px;
            }
            .hero-category .h1 {
                font-size: 1.6rem;
            }
            .hero-category .lead {
                font-size: 0.95rem;
            }
            .section {
                padding: 48px 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .stat-number {
                font-size: 2rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-category .h1 {
                font-size: 1.4rem;
            }
            .hero-category .lead {
                font-size: 0.9rem;
            }
            .btn {
                padding: 8px 16px;
                font-size: 14px;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .card {
                padding: 18px;
            }
        }