/* roulang page: index */
:root {
            --bg-base: #070C14;
            --bg-section: #0B1424;
            --surface-glass: rgba(255, 255, 255, 0.04);
            --surface-glass-strong: rgba(255, 255, 255, 0.08);
            --border-glass: rgba(255, 255, 255, 0.12);
            --line-divider: rgba(255, 255, 255, 0.06);
            --accent-cyan: #22D3EE;
            --accent-cyan-deep: #0891B2;
            --accent-purple: #8B5CF6;
            --signal-green: #34D399;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-mute: #64748B;
            --danger: #F87171;
            --radius-card: 16px;
            --radius-btn: 12px;
            --radius-input: 10px;
            --max-w: 1120px;
            --space-section: 88px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

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

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

        @media (max-width: 767px) {
            .container-main {
                padding-left: 16px;
                padding-right: 16px;
            }
            :root {
                --space-section: 56px;
            }
        }

        /* 导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 64px;
            z-index: 1000;
            background: rgba(7, 12, 20, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid transparent;
            transition: background 0.3s ease, border-color 0.3s ease;
        }

        .site-header.scrolled {
            background: rgba(7, 12, 20, 0.9);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .logo-text svg {
            width: 22px;
            height: 22px;
            color: var(--accent-cyan);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            font-size: 14px;
            color: var(--text-secondary);
            font-weight: 400;
            position: relative;
            padding: 4px 0;
            transition: color 0.2s ease;
            letter-spacing: 0.2px;
        }

        .main-nav a:hover {
            color: var(--text-primary);
        }

        .main-nav a.active {
            color: var(--text-primary);
        }

        .main-nav a.active::after {
            content: '';
            display: block;
            width: 6px;
            height: 6px;
            background: var(--accent-cyan);
            border-radius: 999px;
            margin: 4px auto 0;
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
        }

        .main-nav a:not(.active)::before {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s ease;
        }

        .main-nav a:not(.active):hover::before {
            transform: scaleX(1);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #0891B2, #22D3EE);
            color: #0B1220;
            font-size: 14px;
            font-weight: 600;
            height: 40px;
            padding: 0 20px;
            border-radius: 999px;
            transition: box-shadow 0.3s ease, transform 0.2s ease, opacity 0.2s ease;
            flex-shrink: 0;
        }

        .nav-cta:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35);
            transform: translateY(-1px);
        }

        .nav-cta:active {
            transform: scale(0.98);
        }

        .nav-cta i {
            font-size: 14px;
        }

        /* 移动端导航 */
        .nav-toggle {
            display: none;
            background: none;
            cursor: pointer;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text-primary);
            font-size: 20px;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            width: 100%;
            height: calc(100vh - 64px);
            background: rgba(7, 12, 20, 0.95);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 999;
            flex-direction: column;
            padding: 40px 32px;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .mobile-menu.open {
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-menu a {
            font-size: 22px;
            color: var(--text-secondary);
            padding: 16px 0;
            border-bottom: 1px solid var(--line-divider);
            font-weight: 500;
        }

        .mobile-menu a.active {
            color: var(--text-primary);
        }

        .mobile-menu .cta-wrap {
            margin-top: auto;
            padding-bottom: 40px;
        }

        .mobile-menu .nav-cta {
            width: 100%;
            height: 48px;
            justify-content: center;
            font-size: 16px;
        }

        @media (max-width: 767px) {
            .main-nav {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-cta {
                display: none;
            }

            .mobile-menu {
                display: flex;
            }
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, #0891B2, #22D3EE);
            color: #0B1220;
            font-size: 15px;
            font-weight: 600;
            transition: box-shadow 0.3s ease, transform 0.2s ease, opacity 0.2s ease;
            cursor: pointer;
            border: none;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-large {
            height: 48px;
            padding: 0 28px;
            font-size: 16px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-btn);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-primary);
            font-size: 15px;
            font-weight: 400;
            transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        /* Hero */
        .hero-section {
            min-height: 100vh;
            min-height: 640px;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding: 120px 0 80px;
            background:
                radial-gradient(ellipse 60% 50% at 15% 20%, rgba(34, 211, 238, 0.06), transparent),
                radial-gradient(ellipse 50% 40% at 85% 80%, rgba(139, 92, 246, 0.05), transparent),
                var(--bg-base);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
            background-size: 60px 60px;
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .hero-content {
            max-width: 560px;
        }

        .hero-title {
            font-size: 52px;
            line-height: 1.15;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            margin-top: 20px;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-secondary);
            max-width: 440px;
        }

        .hero-ctas {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 36px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            height: 32px;
            padding: 0 12px;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 13px;
            color: var(--text-secondary);
        }

        .hero-badge i {
            color: var(--signal-green);
            font-size: 12px;
        }

        .hero-mockup {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .mockup-frame {
            position: relative;
            width: 100%;
            max-width: 480px;
            border-radius: 24px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            background: rgba(255, 255, 255, 0.02);
            padding: 12px;
            backdrop-filter: blur(12px);
            overflow: hidden;
        }

        .mockup-frame::after {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: linear-gradient(120deg, transparent 40%, rgba(255, 255, 255, 0.05) 50%, transparent 60%);
            animation: beam 4s ease-in-out infinite;
        }

        @keyframes beam {
            0%,
            100% {
                transform: translateX(-30%);
            }
            50% {
                transform: translateX(30%);
            }
        }

        .mockup-frame img {
            border-radius: 16px;
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
        }

        .mockup-status {
            position: absolute;
            bottom: 20px;
            left: 20px;
            right: 20px;
            background: rgba(7, 12, 20, 0.7);
            backdrop-filter: blur(12px);
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 12px 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .mockup-status i {
            color: var(--signal-green);
            font-size: 16px;
        }

        .mockup-status span {
            font-size: 13px;
            color: var(--text-primary);
        }

        .mockup-status .percent {
            color: var(--accent-cyan);
            font-weight: 600;
        }

        .scroll-hint {
            position: absolute;
            bottom: 24px;
            left: 50%;
            transform: translateX(-50%);
            animation: bounce 2s infinite;
            color: var(--text-mute);
            font-size: 18px;
            z-index: 2;
        }

        @keyframes bounce {
            0%,
            100% {
                transform: translateY(0) translateX(-50%);
            }
            50% {
                transform: translateY(8px) translateX(-50%);
            }
        }

        @media (max-width: 767px) {
            .hero-section {
                padding: 100px 0 60px;
                min-height: 85vh;
            }

            .hero-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .hero-title {
                font-size: 32px;
            }

            .hero-mockup {
                order: 2;
            }

            .mockup-frame {
                max-width: 100%;
            }

            .hero-badges {
                gap: 8px;
            }
        }

        /* 指标看板 */
        .stats-section {
            background: var(--bg-section);
            border-top: 1px solid var(--line-divider);
            border-bottom: 1px solid var(--line-divider);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-card {
            background: var(--surface-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            padding: 20px;
            position: relative;
            overflow: hidden;
            transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
        }

        .stat-card::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--accent-cyan);
        }

        .stat-card:hover {
            background: var(--surface-glass-strong);
            border-color: rgba(34, 211, 238, 0.3);
            transform: translateY(-4px);
        }

        .stat-card .stat-icon {
            font-size: 18px;
            color: var(--accent-cyan);
            opacity: 0.8;
        }

        .stat-card .stat-value {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            font-variant-numeric: tabular-nums;
            margin-top: 8px;
            display: flex;
            align-items: baseline;
            gap: 4px;
        }

        .stat-card .stat-value i {
            font-size: 14px;
            color: var(--signal-green);
        }

        .stat-card .stat-label {
            font-size: 13px;
            color: var(--text-mute);
            margin-top: 8px;
        }

        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 服务矩阵 */
        .services-section {
            background: var(--bg-base);
            position: relative;
        }

        .services-grid {
            display: grid;
            grid-template-columns: 0.8fr 2.2fr;
            gap: 40px;
            align-items: start;
        }

        .services-intro {
            position: sticky;
            top: 90px;
        }

        .services-intro h2 {
            font-size: 32px;
            line-height: 1.25;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .services-intro p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }

        .services-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-card {
            background: var(--surface-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            padding: 24px;
            transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }

        .service-card:hover {
            background: var(--surface-glass-strong);
            border-color: rgba(34, 211, 238, 0.35);
            transform: translateY(-4px);
            box-shadow: 0 8px 40px rgba(139, 92, 246, 0.12);
        }

        .service-card .icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            margin-bottom: 14px;
            transition: filter 0.2s ease;
        }

        .service-card:hover .icon {
            filter: drop-shadow(0 0 6px rgba(34, 211, 238, 0.5));
        }

        .service-card .icon i {
            font-size: 28px;
            color: var(--accent-cyan);
        }

        .service-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        @media (max-width: 1024px) {
            .services-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .services-intro {
                position: static;
            }

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

        @media (max-width: 767px) {
            .services-cards {
                grid-template-columns: 1fr;
            }
        }

        /* 结果对比 */
        .compare-section {
            background: var(--bg-section);
            border-top: 1px solid var(--line-divider);
            border-bottom: 1px solid var(--line-divider);
        }

        .compare-section h2 {
            font-size: 32px;
            text-align: center;
            margin-bottom: 16px;
        }

        .compare-section .sub-desc {
            text-align: center;
            color: var(--text-secondary);
            max-width: 520px;
            margin: 0 auto 48px;
        }

        .compare-grid {
            display: grid;
            grid-template-columns: 1fr 80px 1fr;
            gap: 24px;
            align-items: stretch;
            max-width: 960px;
            margin: 0 auto;
        }

        .compare-card {
            border-radius: var(--radius-card);
            padding: 32px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--line-divider);
        }

        .compare-card.bad {
            opacity: 0.7;
        }

        .compare-card.good {
            background: rgba(34, 211, 238, 0.04);
            border-color: rgba(34, 211, 238, 0.35);
            box-shadow: 0 0 40px rgba(34, 211, 238, 0.05);
        }

        .compare-card .title-row {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
        }

        .compare-card .title-row .icon {
            font-size: 24px;
        }

        .compare-card.bad .title-row .icon {
            color: var(--text-mute);
            filter: grayscale(1);
        }

        .compare-card.good .title-row .icon {
            color: var(--accent-cyan);
        }

        .compare-card h3 {
            font-size: 20px;
            font-weight: 700;
        }

        .compare-card.bad h3 {
            color: var(--text-mute);
        }

        .compare-card ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .compare-card li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .compare-card.bad li {
            color: var(--text-mute);
            font-size: 14px;
        }

        .compare-card.good li {
            color: var(--text-primary);
        }

        .compare-card li i {
            font-size: 14px;
            margin-top: 4px;
        }

        .compare-card.bad li i {
            color: var(--danger);
        }

        .compare-card.good li i {
            color: var(--signal-green);
        }

        .compare-arrow {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .compare-arrow .arrow-circle {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(34, 211, 238, 0.1);
            border: 1px solid rgba(34, 211, 238, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 20px;
            box-shadow: 0 0 30px rgba(34, 211, 238, 0.15);
            font-weight: 600;
        }

        @media (max-width: 767px) {
            .compare-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .compare-arrow {
                transform: rotate(90deg);
            }
        }

        /* 最新资讯 */
        .news-section {
            background: var(--bg-base);
        }

        .news-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            margin-bottom: 32px;
        }

        .news-header h2 {
            font-size: 32px;
            line-height: 1.25;
        }

        .news-header .more-link {
            color: var(--accent-cyan);
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color 0.2s ease;
        }

        .news-header .more-link:hover {
            color: var(--text-primary);
        }

        .news-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .news-card {
            background: var(--surface-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
        }

        .news-card:hover {
            background: var(--surface-glass-strong);
            border-color: rgba(34, 211, 238, 0.3);
            transform: translateY(-4px);
        }

        .news-card.featured {
            grid-column: 1 / -1;
            display: grid;
            grid-template-columns: 40% 60%;
            min-height: 200px;
        }

        .news-card .cover {
            position: relative;
            aspect-ratio: 16/10;
            overflow: hidden;
        }

        .news-card.featured .cover {
            aspect-ratio: auto;
            height: 100%;
            min-height: 200px;
        }

        .news-card .cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .news-card:hover .cover img {
            transform: scale(1.03);
        }

        .news-card .cover-body {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(0deg, rgba(0, 0, 0, 0.7), transparent);
            padding: 16px;
        }

        .news-card .badge {
            display: inline-block;
            height: 22px;
            line-height: 22px;
            padding: 0 10px;
            border-radius: 10px;
            background: rgba(34, 211, 238, 0.15);
            color: var(--accent-cyan);
            font-size: 12px;
            font-weight: 600;
        }

        .news-card .content {
            padding: 20px;
        }

        .news-card.featured .content {
            padding: 28px;
        }

        .news-card h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-card.featured h3 {
            font-size: 22px;
        }

        .news-card p.summary {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
        }

        .news-card .meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--text-mute);
            flex-wrap: wrap;
        }

        .news-card .meta .reading-link {
            color: var(--accent-cyan);
            font-size: 13px;
            margin-left: auto;
            transition: color 0.2s ease;
        }

        .news-card .meta .reading-link:hover {
            color: var(--text-primary);
        }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            border: 1px dashed var(--border-glass);
            border-radius: var(--radius-card);
            background: rgba(255, 255, 255, 0.02);
        }

        .news-empty .empty-icon {
            width: 48px;
            height: 48px;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.04);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
            font-size: 20px;
            color: var(--text-mute);
        }

        .news-empty p {
            color: var(--text-mute);
            font-size: 14px;
        }

        @media (max-width: 767px) {
            .news-list {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .news-card.featured {
                display: block;
            }

            .news-card.featured .cover {
                aspect-ratio: 16/10;
                height: auto;
                min-height: 0;
            }
        }

        /* FAQ */
        .faq-section {
            background: var(--bg-section);
            border-top: 1px solid var(--line-divider);
            border-bottom: 1px solid var(--line-divider);
        }

        .faq-section h2 {
            text-align: center;
            font-size: 32px;
            margin-bottom: 40px;
        }

        .faq-wrapper {
            max-width: 760px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 0;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            position: relative;
            list-style: none;
            min-height: 48px;
            transition: color 0.2s ease;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

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

        .faq-item summary::before {
            content: '';
            width: 3px;
            height: 0;
            background: var(--accent-cyan);
            position: absolute;
            left: -8px;
            transition: height 0.3s ease;
        }

        .faq-item summary:hover::before {
            height: 18px;
        }

        .faq-item summary .arrow {
            font-size: 16px;
            color: var(--text-mute);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }

        .faq-item[open] summary .arrow {
            transform: rotate(180deg);
        }

        .faq-item .answer {
            padding-bottom: 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
        }

        /* 转化表单 */
        .contact-section {
            background: var(--bg-base);
            position: relative;
            overflow: hidden;
        }

        .contact-section::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -100px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.1), transparent);
            pointer-events: none;
        }

        .contact-inner {
            max-width: 480px;
            margin: 0 auto;
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .contact-inner h2 {
            font-size: 32px;
            margin-bottom: 12px;
        }

        .contact-inner .sub-desc {
            color: var(--text-secondary);
            font-size: 14px;
            margin-bottom: 32px;
        }

        .contact-form {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 16px;
            padding: 32px;
            text-align: left;
            backdrop-filter: blur(12px);
        }

        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }

        .form-group input,
        .form-group select {
            width: 100%;
            height: 44px;
            padding: 0 16px;
            border-radius: var(--radius-input);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-primary);
            font-size: 14px;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }

        .form-group select {
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 16px center;
        }

        .form-group select option {
            background: var(--bg-section);
            color: var(--text-primary);
        }

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

        .form-group input:focus,
        .form-group select:focus {
            border-color: rgba(34, 211, 238, 0.6);
            box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
        }

        .form-group .error-text {
            color: var(--danger);
            font-size: 12px;
            margin-top: 6px;
        }

        .form-group input.error,
        .form-group select.error {
            border-color: rgba(248, 113, 113, 0.6);
        }

        .contact-form .btn-primary {
            width: 100%;
            height: 46px;
            margin-top: 8px;
        }

        .privacy-note {
            font-size: 12px;
            color: var(--text-mute);
            margin-top: 16px;
            text-align: center;
            line-height: 1.6;
        }

        /* 页脚 */
        .site-footer {
            background: #05080F;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 56px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand .logo-text {
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-mute);
            max-width: 240px;
            line-height: 1.7;
        }

        .footer-col h4 {
            font-size: 14px;
            color: var(--text-primary);
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul a {
            font-size: 13px;
            color: var(--text-mute);
            transition: color 0.2s ease;
        }

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

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-mute);
            line-height: 1.6;
        }

        .footer-contact i {
            font-size: 14px;
            min-width: 16px;
            color: var(--text-secondary);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-mute);
        }

        @media (max-width: 767px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
        }

        /* 通用标题 */
        .section-title {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.3px;
        }

/* roulang page: category1 */
:root {
            --bg-base: #070C14;
            --bg-section: #0B1424;
            --surface-glass: rgba(255, 255, 255, 0.04);
            --surface-glass-strong: rgba(255, 255, 255, 0.08);
            --border-glass: rgba(255, 255, 255, 0.12);
            --line-divider: rgba(255, 255, 255, 0.06);
            --accent-cyan: #22D3EE;
            --accent-cyan-deep: #0891B2;
            --accent-purple: #8B5CF6;
            --signal-green: #34D399;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-mute: #64748B;
            --danger: #F87171;
            --radius-card: 16px;
            --radius-btn: 12px;
            --section-space: 88px;
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-sans);
            background: var(--bg-base);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.2s ease;
        }

        img {
            max-width: 100%;
            display: block;
        }

        button {
            font-family: inherit;
            cursor: pointer;
        }

        .container-main {
            width: 100%;
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            z-index: 100;
            background: rgba(7, 12, 20, 0.85);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--line-divider);
            transition: background 0.3s ease, box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            background: rgba(5, 8, 15, 0.96);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
        }

        .site-header .container-main {
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            flex-shrink: 0;
        }

        .logo-text {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .logo-text svg {
            width: 24px;
            height: 24px;
            color: var(--accent-cyan);
            filter: drop-shadow(0 0 8px rgba(34, 211, 238, 0.35));
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            position: relative;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 2px;
            letter-spacing: 0.2px;
        }

        .main-nav a:hover {
            color: #fff;
        }

        .main-nav a:hover::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--accent-cyan-deep), var(--accent-cyan));
        }

        .main-nav a.active {
            color: #fff;
            font-weight: 600;
        }

        .main-nav a.active::before {
            content: "";
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: -6px;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent-cyan);
            box-shadow: 0 0 10px rgba(34, 211, 238, 0.6);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 40px;
            min-width: 112px;
            padding: 0 20px;
            border-radius: 999px;
            background: linear-gradient(135deg, #0891B2, #22D3EE);
            color: #0B1220;
            font-size: 14px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            flex-shrink: 0;
        }

        .nav-cta:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35);
            transform: translateY(-1px);
        }

        .nav-cta:active {
            transform: scale(0.98);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 22px;
            cursor: pointer;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
        }

        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        .mobile-drawer {
            position: fixed;
            inset: 0;
            z-index: 120;
            background: rgba(5, 8, 15, 0.97);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            display: flex;
            flex-direction: column;
            padding: 24px 20px 32px;
            transform: translateX(100%);
            transition: transform 0.35s ease;
        }

        .mobile-drawer.open {
            transform: translateX(0);
        }

        .drawer-head {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 36px;
        }

        .drawer-close {
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 22px;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .drawer-close:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        .mobile-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-nav a {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-secondary);
            padding: 16px 8px;
            border-bottom: 1px solid var(--line-divider);
        }

        .mobile-nav a.active {
            color: var(--accent-cyan);
            padding-left: 12px;
        }

        .mobile-cta {
            margin-top: auto;
            display: flex;
            justify-content: center;
        }

        .mobile-cta .nav-cta {
            display: inline-flex;
            min-width: 200px;
            height: 46px;
        }

        /* ===== 按钮 ===== */
        .glow-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, #0891B2, #22D3EE);
            color: #0B1220;
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            box-shadow: 0 4px 20px rgba(34, 211, 238, 0.18);
        }

        .glow-btn:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35), 0 4px 20px rgba(34, 211, 238, 0.25);
            transform: translateY(-1px);
        }

        .glow-btn:active {
            transform: scale(0.98);
        }

        .alt-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-btn);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-primary);
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .alt-btn:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.25);
        }

        .alt-btn:active {
            transform: scale(0.98);
        }

        /* ===== Hero ===== */
        .cat-hero {
            position: relative;
            padding: 120px 0 64px;
            overflow: hidden;
            background:
                radial-gradient(ellipse at 15% 20%, rgba(34, 211, 238, 0.07), transparent 45%),
                radial-gradient(ellipse at 85% 80%, rgba(139, 92, 246, 0.06), transparent 40%);
        }

        .cat-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
            background-size: 48px 48px;
            pointer-events: none;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-mute);
            margin-bottom: 28px;
            position: relative;
            z-index: 1;
        }

        .breadcrumb a {
            color: var(--text-secondary);
        }

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

        .breadcrumb .current {
            color: var(--text-mute);
        }

        .cat-hero-inner {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            align-items: center;
            gap: 56px;
        }

        .cat-hero-title {
            font-size: 42px;
            line-height: 1.2;
            font-weight: 700;
            margin: 0 0 16px;
            position: relative;
            display: inline-block;
            padding-left: 18px;
        }

        .cat-hero-title::before {
            content: "";
            position: absolute;
            left: 0;
            top: 8px;
            bottom: 8px;
            width: 4px;
            border-radius: 4px;
            background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
        }

        .cat-hero-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 480px;
            line-height: 1.7;
            margin: 0;
        }

        .hero-btns {
            margin-top: 28px;
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-art {
            position: relative;
            border-radius: 24px;
            border: 1px solid rgba(255, 255, 255, 0.14);
            overflow: hidden;
            height: 320px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
        }

        .hero-art::after {
            content: "";
            position: absolute;
            top: -50%;
            left: -30%;
            width: 40%;
            height: 200%;
            background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.07), transparent);
            transform: rotate(15deg);
            animation: sweep 4s ease-in-out infinite;
            pointer-events: none;
        }

        @keyframes sweep {
            0% {
                left: -30%;
            }
            55%,
            100% {
                left: 130%;
            }
        }

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

        .hero-art-badge {
            position: absolute;
            left: 16px;
            bottom: 16px;
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            background: rgba(7, 12, 20, 0.72);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.14);
            border-radius: 14px;
        }

        .hero-art-badge i {
            font-size: 24px;
            color: var(--accent-cyan);
        }

        .hero-art-badge strong {
            display: block;
            font-size: 14px;
            line-height: 1.3;
        }

        .hero-art-badge span {
            font-size: 12px;
            color: var(--text-secondary);
        }

        /* ===== Banner 横幅卡 ===== */
        .banner-card-section {
            padding: 24px 0 var(--section-space);
        }

        .banner-card {
            position: relative;
            min-height: 300px;
            border-radius: 24px;
            overflow: hidden;
            isolation: isolate;
        }

        .banner-card img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(105deg, rgba(7, 12, 20, 0.92) 0%, rgba(7, 12, 20, 0.65) 45%, rgba(7, 12, 20, 0.15) 70%, rgba(7, 12, 20, 0.4) 100%);
        }

        .banner-content {
            position: relative;
            padding: 48px 40px;
            max-width: 640px;
        }

        .banner-content h2 {
            font-size: 28px;
            font-weight: 700;
            margin: 0 0 14px;
            line-height: 1.3;
        }

        .banner-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0 0 20px;
        }

        .banner-links {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .inline-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent-cyan);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .inline-link:hover {
            color: #fff;
            text-shadow: 0 0 12px rgba(34, 211, 238, 0.5);
        }

        .inline-link i {
            font-size: 13px;
            transition: transform 0.2s;
        }

        .inline-link:hover i {
            transform: translateX(3px);
        }

        /* ===== 交替内容块 ===== */
        .alternate-section {
            padding: 0 0 var(--section-space);
        }

        .alt-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            align-items: center;
            gap: 56px;
            padding: 40px 0;
        }

        .alt-block.reverse .alt-media {
            order: 2;
        }

        .alt-block.reverse .alt-copy {
            order: 1;
        }

        .alt-media {
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
            height: 280px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
        }

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

        .alt-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(160deg, transparent 65%, rgba(7, 12, 20, 0.55) 100%);
        }

        .alt-copy .alt-tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 14px;
            border-radius: 999px;
            background: rgba(34, 211, 238, 0.12);
            border: 1px solid rgba(34, 211, 238, 0.2);
            color: var(--accent-cyan);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .alt-copy h3 {
            font-size: 24px;
            font-weight: 700;
            line-height: 1.3;
            margin: 0 0 12px;
        }

        .alt-copy p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0 0 20px;
        }

        .alt-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            gap: 10px;
        }

        .alt-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-primary);
        }

        .alt-list li i {
            color: var(--signal-green);
            font-size: 13px;
            width: 16px;
            text-align: center;
        }

        .block-heading {
            text-align: center;
            margin-bottom: 48px;
        }

        .block-heading .block-eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-cyan);
            letter-spacing: 2px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .block-heading h2 {
            font-size: 32px;
            font-weight: 700;
            margin: 0 0 12px;
            line-height: 1.2;
        }

        .block-heading p {
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ===== 卖点卡 ===== */
        .selling-section {
            background: var(--bg-section);
            border-top: 1px solid var(--line-divider);
            border-bottom: 1px solid var(--line-divider);
            padding: var(--section-space) 0;
            position: relative;
            overflow: hidden;
        }

        .selling-section::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.12), transparent 70%);
            pointer-events: none;
        }

        .selling-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .sell-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            padding: 24px;
            transition: all 0.25s ease;
            position: relative;
        }

        .sell-card:hover {
            background: rgba(255, 255, 255, 0.07);
            border-color: rgba(34, 211, 238, 0.4);
            transform: translateY(-4px);
            box-shadow: 0 8px 40px rgba(139, 92, 246, 0.12);
        }

        .sell-card .icon-box {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--accent-cyan);
            background: rgba(34, 211, 238, 0.1);
            margin-bottom: 16px;
            transition: filter 0.2s, transform 0.2s;
        }

        .sell-card:hover .icon-box {
            filter: drop-shadow(0 0 12px rgba(34, 211, 238, 0.4));
            transform: scale(1.05);
        }

        .sell-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 0 0 8px;
        }

        .sell-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        /* ===== 适用场景 ===== */
        .scenario-section {
            padding: var(--section-space) 0;
        }

        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .scenario-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--line-divider);
            border-radius: 18px;
            padding: 28px 24px;
            transition: all 0.25s ease;
            position: relative;
        }

        .scenario-card::before {
            content: "";
            position: absolute;
            left: 0;
            top: 24px;
            width: 3px;
            height: 40px;
            border-radius: 0 4px 4px 0;
            background: linear-gradient(180deg, var(--accent-cyan), transparent);
            opacity: 0.5;
            transition: opacity 0.2s;
        }

        .scenario-card:hover {
            border-color: rgba(255, 255, 255, 0.18);
            background: rgba(255, 255, 255, 0.05);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
        }

        .scenario-card:hover::before {
            opacity: 1;
        }

        .scenario-card .s-icon {
            font-size: 28px;
            color: var(--accent-purple);
            margin-bottom: 16px;
        }

        .scenario-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 0 0 8px;
        }

        .scenario-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        .scenario-tag {
            display: inline-flex;
            margin-top: 16px;
            padding: 4px 12px;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: var(--text-secondary);
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: var(--section-space) 0;
            background: var(--bg-section);
            border-top: 1px solid var(--line-divider);
            border-bottom: 1px solid var(--line-divider);
        }

        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--line-divider);
        }

        .faq-item:first-child {
            border-top: 1px solid var(--line-divider);
        }

        .faq-item summary {
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            padding: 18px 4px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            position: relative;
            transition: color 0.2s;
            min-height: 56px;
        }

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

        .faq-item summary::before {
            content: "";
            width: 3px;
            height: 0;
            border-radius: 4px;
            background: var(--accent-cyan);
            position: absolute;
            left: -8px;
            top: 50%;
            transform: translateY(-50%);
            transition: height 0.2s;
        }

        .faq-item summary:hover::before {
            height: 24px;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-icon {
            font-size: 18px;
            color: var(--text-mute);
            transition: transform 0.3s ease, color 0.2s;
            flex-shrink: 0;
        }

        .faq-item[open] .faq-icon {
            transform: rotate(180deg);
            color: var(--accent-cyan);
        }

        .faq-answer {
            padding: 0 4px 20px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 96px 0;
            position: relative;
            overflow: hidden;
            background:
                radial-gradient(ellipse at 50% 100%, rgba(139, 92, 246, 0.16), transparent 60%),
                var(--bg-base);
        }

        .cta-inner {
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .cta-inner h2 {
            font-size: 32px;
            font-weight: 700;
            margin: 0 0 12px;
            line-height: 1.25;
        }

        .cta-inner p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0 0 28px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #05080F;
            border-top: 1px solid var(--line-divider);
            padding: 64px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--line-divider);
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-mute);
            max-width: 280px;
            line-height: 1.7;
            margin: 12px 0 0;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0 0 16px;
        }

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

        .footer-col li {
            margin-bottom: 10px;
        }

        .footer-col a {
            font-size: 13px;
            color: var(--text-secondary);
        }

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

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .footer-contact i {
            width: 16px;
            text-align: center;
            color: var(--text-mute);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0 0;
            font-size: 12px;
            color: var(--text-mute);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1023px) {
            .cat-hero-inner {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .hero-art {
                height: 260px;
            }

            .selling-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .alt-block {
                grid-template-columns: 1fr;
                gap: 32px;
                padding: 32px 0;
            }

            .alt-block.reverse .alt-media {
                order: 0;
            }

            .alt-block.reverse .alt-copy {
                order: 0;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 767px) {
            :root {
                --section-space: 56px;
            }

            .container-main {
                padding: 0 16px;
            }

            .main-nav {
                display: none;
            }

            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: flex;
            }

            .cat-hero {
                padding: 96px 0 48px;
            }

            .cat-hero-title {
                font-size: 32px;
                padding-left: 14px;
            }

            .cat-hero-title::before {
                top: 6px;
                bottom: 6px;
            }

            .cat-hero-desc {
                font-size: 14px;
            }

            .hero-btns {
                flex-direction: column;
                align-items: stretch;
            }

            .hero-btns .glow-btn,
            .hero-btns .alt-btn {
                width: 100%;
            }

            .hero-art {
                height: 220px;
            }

            .hero-art-badge {
                padding: 10px 12px;
            }

            .banner-content {
                padding: 32px 24px;
            }

            .banner-content h2 {
                font-size: 22px;
            }

            .banner-links {
                flex-direction: column;
                gap: 12px;
            }

            .block-heading h2 {
                font-size: 24px;
            }

            .block-heading p {
                font-size: 14px;
            }

            .selling-grid,
            .scenario-grid {
                grid-template-columns: 1fr;
            }

            .alt-media {
                height: 200px;
            }

            .alt-copy h3 {
                font-size: 20px;
            }

            .cta-inner h2 {
                font-size: 24px;
            }

            .cta-section {
                padding: 64px 0;
            }

            .faq-item summary {
                padding: 16px 4px;
                font-size: 15px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }

            .banner-card {
                min-height: 280px;
            }
        }

/* roulang page: article */
:root {
            --bg-base: #070C14;
            --bg-section: #0B1424;
            --bg-footer: #05080F;
            --surface-glass: rgba(255, 255, 255, 0.04);
            --surface-glass-strong: rgba(255, 255, 255, 0.08);
            --border-glass: rgba(255, 255, 255, 0.12);
            --line-divider: rgba(255, 255, 255, 0.06);
            --accent-cyan: #22D3EE;
            --accent-cyan-deep: #0891B2;
            --accent-purple: #8B5CF6;
            --signal-green: #34D399;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-mute: #64748B;
            --danger: #F87171;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --section-gap: 88px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            background: var(--bg-base);
            color: var(--text-primary);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 15px;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        .tabular-nums {
            font-variant-numeric: tabular-nums;
        }

        .container-main {
            max-width: 1120px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 64px;
            display: flex;
            align-items: center;
            background: transparent;
            border-bottom: 1px solid transparent;
            transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            background: rgba(7, 12, 20, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom-color: rgba(255, 255, 255, 0.08);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }

        .site-header .container-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .logo-text {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.4px;
            color: var(--text-primary);
            white-space: nowrap;
        }

        .logo-text svg {
            width: 22px;
            height: 22px;
            color: var(--accent-cyan);
            stroke: currentColor;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
            margin: 0 auto;
        }

        .main-nav a {
            position: relative;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 2px 10px;
            transition: color 0.2s;
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--text-primary);
        }

        .main-nav a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 2px;
            width: 100%;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--accent-cyan-deep), var(--accent-cyan));
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s;
        }

        .main-nav a:hover::after {
            transform: scaleX(1);
        }

        .main-nav a.active {
            color: var(--text-primary);
        }

        .main-nav a.active::before {
            content: "";
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            border-radius: 999px;
            background: var(--accent-cyan);
            box-shadow: 0 0 10px rgba(34, 211, 238, 0.6);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 40px;
            padding: 0 22px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
            font-size: 14px;
            font-weight: 600;
            transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .nav-cta:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35), 0 4px 12px rgba(34, 211, 238, 0.2);
            transform: translateY(-1px);
            filter: brightness(1.05);
        }

        .nav-cta:active {
            transform: scale(0.98);
        }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-sm);
            background: var(--surface-glass);
            color: var(--text-primary);
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 18px;
            transition: background 0.2s, border-color 0.2s;
        }

        .nav-toggle:hover {
            background: var(--surface-glass-strong);
            border-color: rgba(34, 211, 238, 0.4);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 99;
            background: rgba(7, 12, 20, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            padding: 32px;
        }

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

        .mobile-menu a {
            font-size: 22px;
            font-weight: 600;
            color: var(--text-secondary);
            transition: color 0.2s;
        }

        .mobile-menu a:hover,
        .mobile-menu a.active {
            color: var(--accent-cyan);
        }

        .mobile-menu .nav-cta {
            height: 48px;
            font-size: 16px;
            padding: 0 36px;
            margin-top: 12px;
        }

        .page-wrap {
            padding-top: 64px;
            background: var(--bg-base);
            position: relative;
        }

        .article-container {
            max-width: 760px;
            margin: 0 auto;
            padding: 48px 24px 24px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-mute);
            margin-bottom: 28px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color 0.2s;
        }

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

        .breadcrumb .sep {
            color: var(--text-mute);
            opacity: 0.5;
        }

        .breadcrumb .current {
            color: var(--text-secondary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 360px;
        }

        .article-card {
            background: var(--surface-glass);
            border: 1px solid var(--border-glass);
            border-radius: 24px;
            padding: 40px;
            margin-bottom: 48px;
            position: relative;
            overflow: hidden;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
        }

        .article-card::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 180px;
            height: 180px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.08), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .article-header {
            margin-bottom: 32px;
            position: relative;
            z-index: 1;
        }

        .article-header h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            color: var(--text-secondary);
            flex-wrap: wrap;
        }

        .article-meta .dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--text-mute);
            opacity: 0.5;
            flex-shrink: 0;
        }

        .article-meta i {
            margin-right: 6px;
            font-size: 13px;
            color: var(--accent-cyan);
        }

        .article-body {
            font-size: 16px;
            line-height: 1.75;
            color: #C8D2E0;
            word-break: break-word;
            position: relative;
            z-index: 1;
        }

        .article-body p {
            margin-bottom: 24px;
        }

        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 40px 0 16px;
            color: var(--text-primary);
            line-height: 1.35;
        }

        .article-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin: 32px 0 12px;
            color: var(--text-primary);
            line-height: 1.4;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 24px 0;
            padding-left: 24px;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body blockquote {
            margin: 32px 0;
            padding: 16px 24px;
            border-left: 4px solid var(--accent-cyan);
            background: var(--surface-glass);
            border-radius: 0 12px 12px 0;
            color: var(--text-secondary);
            font-style: italic;
        }

        .article-body img {
            border-radius: 12px;
            margin: 32px auto;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
        }

        .article-body img + em {
            display: block;
            text-align: center;
            font-size: 13px;
            color: var(--text-mute);
            margin-top: -20px;
            margin-bottom: 24px;
            font-style: normal;
        }

        .article-body a {
            color: var(--accent-cyan);
            border-bottom: 1px solid rgba(34, 211, 238, 0.3);
            transition: border-color 0.2s;
        }

        .article-body a:hover {
            border-bottom-color: var(--accent-cyan);
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 14px;
        }

        .article-body th {
            background: var(--bg-section);
            color: var(--text-primary);
            font-weight: 600;
            text-align: left;
        }

        .article-body th,
        .article-body td {
            border: 1px solid var(--border-glass);
            padding: 10px 14px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 32px 0 0;
            padding-top: 24px;
            border-top: 1px solid var(--line-divider);
            position: relative;
            z-index: 1;
        }

        .tag-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            height: 28px;
            padding: 0 14px;
            border-radius: 999px;
            background: rgba(34, 211, 238, 0.1);
            border: 1px solid rgba(34, 211, 238, 0.2);
            font-size: 12px;
            font-weight: 500;
            color: var(--accent-cyan);
            transition: background 0.2s, border-color 0.2s;
        }

        .tag-badge:hover {
            background: rgba(34, 211, 238, 0.18);
            border-color: rgba(34, 211, 238, 0.4);
        }

        .article-empty {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-secondary);
            position: relative;
            z-index: 1;
        }

        .article-empty i {
            font-size: 48px;
            color: var(--text-mute);
            margin-bottom: 16px;
            display: inline-block;
        }

        .article-empty p {
            font-size: 16px;
            margin-bottom: 20px;
            color: var(--text-secondary);
        }

        .article-empty .btn-back {
            display: inline-flex;
        }

        .related-section {
            max-width: 1120px;
            margin: 0 auto;
            padding: 24px 24px 64px;
        }

        .related-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }

        .related-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
            position: relative;
            padding-left: 18px;
            line-height: 1.3;
        }

        .related-header h2::before {
            content: "";
            position: absolute;
            left: 0;
            top: 6px;
            bottom: 6px;
            width: 4px;
            border-radius: 4px;
            background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
        }

        .related-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: var(--text-secondary);
            transition: color 0.2s, gap 0.2s;
        }

        .related-more:hover {
            color: var(--accent-cyan);
            gap: 10px;
        }

        .related-grid {
            display: grid;
            gap: 24px;
        }

        .relation-card {
            background: var(--surface-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
            display: block;
        }

        .relation-card:hover {
            transform: translateY(-4px);
            border-color: rgba(34, 211, 238, 0.4);
            box-shadow: 0 8px 40px rgba(139, 92, 246, 0.12);
        }

        .relation-card .card-cover {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            position: relative;
            background: var(--bg-section);
        }

        .relation-card .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s;
        }

        .relation-card:hover .card-cover img {
            transform: scale(1.04);
        }

        .relation-card .card-body {
            padding: 20px;
        }

        .relation-card h3 {
            font-size: 16px;
            font-weight: 700;
            line-height: 1.5;
            color: var(--text-primary);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .relation-card .card-date {
            font-size: 13px;
            color: var(--text-mute);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-cta-banner {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px 64px;
        }

        .cta-inner {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            padding: 40px 48px;
            border-radius: 20px;
            background: linear-gradient(135deg, rgba(14, 41, 63, 0.7), rgba(31, 14, 63, 0.7));
            border: 1px solid var(--border-glass);
            overflow: hidden;
        }

        .cta-inner::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -10%;
            width: 260px;
            height: 260px;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.2), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-inner::after {
            content: "";
            position: absolute;
            bottom: -60%;
            left: -5%;
            width: 220px;
            height: 220px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.12), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-text {
            position: relative;
            z-index: 1;
        }

        .cta-text h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.3;
        }

        .cta-text p {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 8px;
        }

        .cta-inner .btn-primary {
            position: relative;
            z-index: 1;
            flex-shrink: 0;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 48px;
            padding: 0 32px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
            font-size: 15px;
            font-weight: 600;
            transition: box-shadow 0.25s, transform 0.25s, filter 0.25s;
            white-space: nowrap;
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35), 0 4px 16px rgba(34, 211, 238, 0.25);
            filter: brightness(1.05);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 40px;
            padding: 0 28px;
            border-radius: 999px;
            background: var(--surface-glass);
            border: 1px solid var(--border-glass);
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            transition: all 0.25s;
            cursor: pointer;
        }

        .btn-back:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: var(--surface-glass-strong);
        }

        .article-bottom-cta {
            text-align: center;
            padding: 0 24px 80px;
        }

        .site-footer {
            background: var(--bg-footer);
            border-top: 1px solid var(--line-divider);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
        }

        .footer-brand .logo-text {
            font-size: 18px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-mute);
            margin-top: 16px;
            max-width: 240px;
            line-height: 1.7;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 20px;
        }

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

        .footer-col li {
            margin-bottom: 12px;
        }

        .footer-col a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: color 0.2s;
        }

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

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .footer-contact i {
            width: 16px;
            text-align: center;
            color: var(--text-mute);
            font-size: 14px;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            border-top: 1px solid var(--line-divider);
            font-size: 12px;
            color: var(--text-mute);
            flex-wrap: wrap;
            gap: 8px;
        }

        @media (max-width: 1024px) {
            .main-nav {
                gap: 20px;
            }

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

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

            .main-nav {
                display: none;
            }

            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .container-main {
                padding-left: 16px;
                padding-right: 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .article-card {
                padding: 24px;
            }

            .article-header h1 {
                font-size: 26px;
            }

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

            .related-header h2 {
                font-size: 24px;
            }

            .article-container {
                padding: 32px 16px 16px;
            }

            .cta-inner {
                flex-direction: column;
                text-align: center;
                padding: 32px 24px;
            }

            .cta-text p {
                margin-bottom: 16px;
            }

            .article-bottom-cta {
                padding: 0 16px 56px;
            }

            .related-section {
                padding: 24px 16px 56px;
            }

            .article-cta-banner {
                padding: 0 16px 56px;
            }

            .breadcrumb .current {
                max-width: 200px;
            }
        }

        @media (max-width: 480px) {
            .article-header h1 {
                font-size: 22px;
            }

            .article-body {
                font-size: 15px;
            }

            .article-body h2 {
                font-size: 21px;
            }

            .article-body h3 {
                font-size: 17px;
            }

            .article-meta {
                font-size: 13px;
                gap: 8px;
            }

            .footer-bottom {
                justify-content: center;
                text-align: center;
            }
        }

/* roulang page: category3 */
:root {
            --bg-base: #070C14;
            --bg-section: #0B1424;
            --surface-glass: rgba(255,255,255,0.04);
            --surface-glass-strong: rgba(255,255,255,0.08);
            --border-glass: rgba(255,255,255,0.12);
            --line-divider: rgba(255,255,255,0.06);
            --accent-cyan: #22D3EE;
            --accent-cyan-deep: #0891B2;
            --accent-purple: #8B5CF6;
            --signal-green: #34D399;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-mute: #64748B;
            --danger: #F87171;
            --radius-card: 16px;
            --radius-btn: 12px;
            --radius-input: 10px;
            --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            background: var(--bg-base);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            font-family: inherit;
        }

        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container-main {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===================== Header ===================== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 64px;
            display: flex;
            align-items: center;
            background: rgba(7, 12, 20, 0.75);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background 0.3s ease, border-color 0.3s ease;
        }

        .site-header.scrolled {
            background: rgba(7, 12, 20, 0.92);
            border-bottom-color: rgba(255, 255, 255, 0.1);
        }

        .site-header .container-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }

        .logo-area {
            display: flex;
            align-items: center;
            flex-shrink: 0;
        }

        .logo-text {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--text-primary);
            white-space: nowrap;
        }

        .logo-text svg {
            width: 22px;
            height: 22px;
            color: var(--accent-cyan);
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            position: relative;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 2px;
            transition: color 0.2s ease;
        }

        .main-nav a:hover {
            color: var(--text-primary);
        }

        .main-nav a:hover::before {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan-deep), var(--accent-cyan));
            border-radius: 2px;
        }

        .main-nav a.active {
            color: var(--text-primary);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: -3px;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            border-radius: 999px;
            background: var(--accent-cyan);
            box-shadow: 0 0 8px rgba(34, 211, 238, 0.6);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 40px;
            min-width: 112px;
            padding: 0 20px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
            font-size: 14px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: box-shadow 0.2s ease, transform 0.2s ease;
            flex-shrink: 0;
        }

        .nav-cta:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35);
            transform: translateY(-1px);
        }

        .nav-cta i {
            font-size: 14px;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 8px;
            color: var(--text-primary);
            width: 40px;
            height: 40px;
            font-size: 18px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: border-color 0.2s, background 0.2s;
            flex-shrink: 0;
        }

        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(255, 255, 255, 0.25);
        }

        /* ===================== 按钮体系 ===================== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: box-shadow 0.25s ease, transform 0.2s ease;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, 0.35);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-btn);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-primary);
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s, border-color 0.2s, transform 0.2s;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.28);
            transform: translateY(-1px);
        }

        /* ===================== 版首横幅卡 ===================== */
        .banner-card {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            min-height: 300px;
            background-size: cover;
            background-position: center;
            border: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: flex-end;
            box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
        }

        .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(115deg, rgba(7, 12, 20, 0.93) 15%, rgba(7, 12, 20, 0.45) 55%, rgba(7, 12, 20, 0.2) 100%);
            z-index: 1;
        }

        .banner-content {
            position: relative;
            z-index: 2;
            padding: 48px;
            max-width: 680px;
        }

        .banner-content .tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(34, 211, 238, 0.15);
            border: 1px solid rgba(34, 211, 238, 0.25);
            color: var(--accent-cyan);
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }

        .banner-content h2 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .banner-content p {
            font-size: 15px;
            color: rgba(241, 245, 249, 0.85);
            line-height: 1.7;
            margin-bottom: 24px;
        }

        /* ===================== 交替内容块 ===================== */
        .alt-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
            padding: 48px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .alt-block:last-child {
            border-bottom: none;
        }

        .alt-block.reverse .alt-media {
            order: 1;
        }

        .alt-block.reverse .alt-content {
            order: 2;
        }

        .alt-media {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
        }

        .alt-media img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            display: block;
            transition: transform 0.4s ease;
        }

        .alt-media:hover img {
            transform: scale(1.03);
        }

        .alt-media::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 70%, rgba(7, 12, 20, 0.4) 100%);
            border-radius: 20px;
            pointer-events: none;
        }

        .alt-content .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-cyan);
            background: rgba(34, 211, 238, 0.1);
            padding: 4px 12px;
            border-radius: 999px;
            margin-bottom: 16px;
        }

        .alt-content h3 {
            font-size: 24px;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .alt-content p {
            font-size: 15px;
            line-height: 1.75;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }

        .alt-content .feature-list {
            list-style: none;
            margin-top: 20px;
        }

        .alt-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }

        .alt-content .feature-list li i {
            color: var(--signal-green);
            margin-top: 3px;
            font-size: 14px;
            flex-shrink: 0;
        }

        /* ===================== FAQ通用样式 ===================== */
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            background: none;
            border: none;
            padding: 16px 0;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            text-align: left;
            transition: color 0.2s;
        }

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

        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--text-mute);
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 24px 20px 0;
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        /* ===================== CTA区 ===================== */
        .cta-section {
            background: var(--bg-section);
            border-top: 1px solid var(--line-divider);
            border-bottom: 1px solid var(--line-divider);
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60%;
            left: 50%;
            transform: translateX(-50%);
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(139, 92, 246, 0.14) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section .container-main {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-section p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-bottom: 24px;
        }

        /* ===================== Footer ===================== */
        .site-footer {
            background: #05080F;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 56px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.4fr;
            gap: 48px;
            margin-bottom: 40px;
        }

        .footer-brand .logo-text {
            font-size: 18px;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-mute);
            line-height: 1.7;
            max-width: 240px;
            margin-top: 12px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

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

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-mute);
            transition: color 0.2s;
        }

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

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-mute);
        }

        .footer-contact li i {
            width: 16px;
            color: var(--accent-cyan);
            font-size: 14px;
            flex-shrink: 0;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: var(--text-mute);
        }

        /* ===================== 响应式 ===================== */
        @media (max-width: 768px) {
            .container-main {
                padding: 0 16px;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                bottom: 0;
                flex-direction: column;
                justify-content: flex-start;
                gap: 4px;
                background: rgba(7, 12, 20, 0.97);
                backdrop-filter: blur(24px);
                -webkit-backdrop-filter: blur(24px);
                padding: 32px 24px;
                transform: translateX(100%);
                transition: transform 0.3s ease;
                z-index: 99;
            }

            .main-nav.open {
                transform: translateX(0);
            }

            .main-nav a {
                font-size: 22px;
                font-weight: 600;
                text-align: center;
                padding: 16px 0;
                width: 100%;
                color: var(--text-secondary);
            }

            .main-nav a.active {
                color: var(--text-primary);
            }

            .main-nav a.active::after {
                bottom: 6px;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .nav-cta {
                display: none;
            }

            .main-nav.open ~ .nav-cta {
                display: inline-flex;
                position: fixed;
                bottom: 40px;
                left: 50%;
                transform: translateX(-50%);
                z-index: 101;
            }

            .banner-content {
                padding: 28px;
            }

            .banner-content h2 {
                font-size: 22px;
            }

            .banner-content p {
                font-size: 14px;
            }

            .banner-card {
                min-height: 240px;
            }

            .alt-block {
                grid-template-columns: 1fr;
                gap: 24px;
                padding: 32px 0;
            }

            .alt-block.reverse .alt-media {
                order: 0;
            }

            .alt-block.reverse .alt-content {
                order: 1;
            }

            .alt-media img {
                height: 220px;
            }

            .alt-content h3 {
                font-size: 20px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 8px;
            }

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

            .cta-section h2 {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            .logo-text {
                font-size: 17px;
            }

            .logo-text svg {
                width: 19px;
                height: 19px;
            }

            .banner-content {
                padding: 22px;
            }

            .banner-content .btn-primary,
            .banner-content .btn-secondary {
                font-size: 14px;
                height: 40px;
                padding: 0 16px;
            }

            .alt-media img {
                height: 180px;
            }
        }

        @media (min-width: 769px) {
            .main-nav {
                display: flex !important;
            }
        }

/* roulang page: category2 */
:root {
            --bg-base: #070C14;
            --bg-section: #0B1424;
            --surface-glass: rgba(255, 255, 255, 0.04);
            --surface-glass-strong: rgba(255, 255, 255, 0.08);
            --border-glass: rgba(255, 255, 255, 0.12);
            --line-divider: rgba(255, 255, 255, 0.06);
            --accent-cyan: #22D3EE;
            --accent-cyan-deep: #0891B2;
            --accent-purple: #8B5CF6;
            --signal-green: #34D399;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-mute: #64748B;
            --danger: #F87171;
            --content-width: 1120px;
            --space-section: 88px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-primary);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }

        button {
            font-family: inherit;
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        ::selection {
            background: rgba(34, 211, 238, .25);
            color: #fff;
        }

        ::-webkit-scrollbar {
            width: 10px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-base);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, .12);
            border-radius: 8px;
            border: 2px solid var(--bg-base);
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(34, 211, 238, .35);
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 600;
            height: 44px;
            padding: 0 24px;
            transition: all .25s ease;
            border: none;
            line-height: 1;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, .35);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, .04);
            border: 1px solid rgba(255, 255, 255, .15);
            color: var(--text-primary);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, .08);
            border-color: rgba(255, 255, 255, .28);
        }

        .btn-lg {
            height: 48px;
            padding: 0 32px;
            font-size: 16px;
        }

        .btn-sm {
            height: 32px;
            padding: 0 16px;
            font-size: 13px;
            border-radius: 999px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            z-index: 1000;
            display: flex;
            align-items: center;
            background: rgba(7, 12, 20, .55);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid transparent;
            transition: background .3s ease, border-color .3s ease;
        }

        .site-header.scrolled {
            background: rgba(7, 12, 20, .88);
            border-bottom-color: rgba(255, 255, 255, .06);
        }

        .site-header .container-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo-text {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
        }

        .logo-text svg {
            width: 24px;
            height: 24px;
            color: var(--accent-cyan);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            position: relative;
            font-size: 14px;
            color: var(--text-secondary);
            padding: 6px 0;
            transition: color .2s ease;
        }

        .main-nav a:hover {
            color: var(--text-primary);
        }

        .main-nav a:hover::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-cyan-deep), var(--accent-cyan));
            border-radius: 2px;
        }

        .main-nav a.active {
            color: var(--text-primary);
        }

        .main-nav a.active::before {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 50%;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent-cyan);
            border-radius: 50%;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 40px;
            padding: 0 20px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
            font-size: 14px;
            font-weight: 600;
            transition: all .25s ease;
            white-space: nowrap;
        }

        .nav-cta:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, .35);
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 24px;
            cursor: pointer;
            padding: 8px;
            transition: opacity .2s;
        }

        .nav-toggle:hover {
            opacity: .8;
        }

        .mobile-drawer {
            position: fixed;
            inset: 0;
            z-index: 999;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            background: rgba(7, 12, 20, .96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transition: opacity .3s ease, visibility .3s ease;
        }

        .mobile-drawer.open {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
        }

        .mobile-nav {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 28px;
        }

        .mobile-nav a {
            font-size: 24px;
            font-weight: 600;
            color: var(--text-secondary);
            padding: 8px 16px;
            border-radius: 12px;
            transition: all .2s ease;
        }

        .mobile-nav a:hover,
        .mobile-nav a.active {
            color: var(--text-primary);
            background: rgba(34, 211, 238, .08);
        }

        .mobile-cta {
            position: absolute;
            bottom: 48px;
            left: 50%;
            transform: translateX(-50%);
            height: 48px;
            padding: 0 40px;
            border-radius: 999px;
            background: linear-gradient(135deg, var(--accent-cyan-deep), var(--accent-cyan));
            color: #0B1220;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            white-space: nowrap;
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .mobile-cta:hover {
            box-shadow: 0 0 24px rgba(139, 92, 246, .35);
            transform: translateX(-50%) translateY(-2px);
        }

        main {
            padding-top: 64px;
        }

        .category-hero {
            padding: 96px 0 48px;
            background:
                radial-gradient(ellipse at 15% 15%, rgba(34, 211, 238, .06), transparent 55%),
                radial-gradient(ellipse at 85% 85%, rgba(139, 92, 246, .05), transparent 55%);
            border-bottom: 1px solid rgba(255, 255, 255, .04);
        }

        .category-hero h1 {
            font-size: 32px;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .category-hero h1::before {
            content: '';
            flex-shrink: 0;
            width: 4px;
            height: 32px;
            border-radius: 4px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
        }

        .category-hero .subtitle {
            color: var(--text-secondary);
            font-size: 14px;
            margin-left: 20px;
            max-width: 480px;
        }

        .category-banner-wrap {
            padding: 48px 0 0;
        }

        .category-banner {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            background-size: cover;
            background-position: center;
            min-height: 300px;
            display: flex;
            align-items: center;
            padding: 48px;
            border: 1px solid rgba(255, 255, 255, .1);
            box-shadow: 0 16px 48px rgba(0, 0, 0, .35);
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(7, 12, 20, .95) 15%, rgba(7, 12, 20, .65) 55%, rgba(7, 12, 20, .28) 100%);
        }

        .category-banner-inner {
            position: relative;
            z-index: 1;
            max-width: 580px;
        }

        .category-banner-inner h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .category-banner-inner p {
            color: rgba(241, 245, 249, .85);
            font-size: 15px;
            line-height: 1.75;
            margin-bottom: 24px;
        }

        .banner-links {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .banner-links a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--accent-cyan);
            font-size: 14px;
            font-weight: 600;
            transition: all .2s ease;
        }

        .banner-links a i {
            font-size: 12px;
            transition: transform .2s ease;
        }

        .banner-links a:hover {
            color: #fff;
        }

        .banner-links a:hover i {
            transform: translateX(4px);
        }

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

        .feature-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
            margin-bottom: 72px;
        }

        .feature-row:last-child {
            margin-bottom: 0;
        }

        .feature-row-reverse .feature-media {
            order: -1;
        }

        .feature-text h3 {
            font-size: 24px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            padding-left: 16px;
            position: relative;
        }

        .feature-text h3::before {
            content: '';
            position: absolute;
            left: 0;
            top: 4px;
            bottom: 4px;
            width: 4px;
            border-radius: 4px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
        }

        .feature-text p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        .feature-text .feature-tag {
            display: inline-flex;
            align-items: center;
            height: 28px;
            padding: 0 14px;
            border-radius: 999px;
            background: rgba(34, 211, 238, .1);
            color: var(--accent-cyan);
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .feature-media {
            border-radius: 16px;
            overflow: hidden;
            position: relative;
            border: 1px solid rgba(255, 255, 255, .1);
            box-shadow: 0 12px 40px rgba(0, 0, 0, .3);
        }

        .feature-media img {
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .feature-media:hover img {
            transform: scale(1.03);
        }

        .feature-media::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 60%, rgba(7, 12, 20, .25) 100%);
            pointer-events: none;
        }

        .faq-section {
            padding: var(--space-section) 0;
            background: var(--bg-section);
            border-top: 1px solid rgba(255, 255, 255, .04);
            border-bottom: 1px solid rgba(255, 255, 255, .04);
        }

        .faq-narrow {
            max-width: 760px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .faq-section h2 {
            font-size: 32px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 8px;
        }

        .faq-section .faq-desc {
            text-align: center;
            color: var(--text-secondary);
            font-size: 14px;
            margin-bottom: 40px;
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, .06);
        }

        .faq-item summary {
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 0 16px 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            position: relative;
            transition: color .2s ease;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%) scaleY(0);
            width: 3px;
            height: 20px;
            background: var(--accent-cyan);
            border-radius: 4px;
            transition: transform .3s ease;
        }

        .faq-item summary:hover {
            color: var(--text-primary);
        }

        .faq-item summary:hover::before {
            transform: translateY(-50%) scaleY(1);
        }

        .faq-item .faq-arrow {
            font-size: 14px;
            color: var(--text-secondary);
            transition: transform .3s ease;
            flex-shrink: 0;
        }

        .faq-item[open] summary .faq-arrow {
            transform: rotate(180deg);
        }

        .faq-item .faq-answer {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
            padding: 0 0 20px 24px;
        }

        .cta-section {
            padding: var(--space-section) 0 48px;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 640px;
            height: 420px;
            background: radial-gradient(circle, rgba(139, 92, 246, .15), transparent 65%);
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            text-align: center;
            max-width: 560px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .cta-inner h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.25;
        }

        .cta-inner p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
            margin-bottom: 28px;
        }

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

        .back-home {
            text-align: center;
            padding: 32px 0 0;
            position: relative;
        }

        .back-home a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-secondary);
            font-size: 14px;
            transition: all .2s ease;
            padding: 10px 20px;
            border-radius: 999px;
            border: 1px solid transparent;
        }

        .back-home a:hover {
            color: var(--accent-cyan);
            background: rgba(34, 211, 238, .06);
            border-color: rgba(34, 211, 238, .2);
        }

        .site-footer {
            background: #05080F;
            border-top: 1px solid rgba(255, 255, 255, .06);
            padding: 64px 0 32px;
            margin-top: 40px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, .06);
        }

        .footer-brand .logo-text {
            font-size: 18px;
        }

        .footer-brand p {
            color: var(--text-secondary);
            font-size: 13px;
            line-height: 1.7;
            max-width: 300px;
            margin-top: 12px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col a {
            color: var(--text-secondary);
            font-size: 13px;
            transition: color .2s ease;
        }

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

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 12px;
            margin-bottom: 12px;
        }

        .footer-contact i {
            width: 16px;
            color: var(--accent-cyan);
            font-size: 14px;
            text-align: center;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 12px;
            color: var(--text-mute);
        }

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

            .container-main {
                padding: 0 16px;
            }

            .main-nav {
                display: none;
            }

            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: block;
            }

            .category-hero {
                padding: 72px 0 32px;
            }

            .category-hero h1 {
                font-size: 28px;
                gap: 12px;
            }

            .category-hero .subtitle {
                margin-left: 16px;
                font-size: 13px;
            }

            .category-banner {
                padding: 32px 24px;
                min-height: 260px;
                border-radius: 16px;
            }

            .category-banner-inner h2 {
                font-size: 22px;
            }

            .category-banner-inner p {
                font-size: 14px;
            }

            .banner-links {
                gap: 16px;
            }

            .feature-row {
                grid-template-columns: 1fr;
                gap: 32px;
                margin-bottom: 56px;
            }

            .feature-row-reverse .feature-media {
                order: 0;
            }

            .feature-text h3 {
                font-size: 20px;
            }

            .feature-media img {
                aspect-ratio: 16 / 10;
            }

            .faq-section h2 {
                font-size: 26px;
            }

            .faq-narrow {
                padding: 0 16px;
            }

            .cta-inner h2 {
                font-size: 26px;
            }

            .cta-actions {
                flex-direction: column;
                align-items: center;
            }

            .cta-actions .btn {
                width: 100%;
                max-width: 320px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                align-items: flex-start;
            }
        }

        @media (max-width: 520px) {
            .category-banner {
                padding: 24px 16px;
            }

            .feature-row {
                gap: 24px;
            }

            .feature-text p {
                font-size: 14px;
            }

            .faq-item summary {
                font-size: 15px;
                padding: 14px 0 14px 20px;
            }

            .faq-item .faq-answer {
                font-size: 13px;
                padding-left: 20px;
            }

            .btn-lg {
                height: 44px;
                padding: 0 24px;
                font-size: 15px;
            }
        }