/* roulang page: index */
:root {
            --bg-deep: #0A0E27;
            --bg-card: rgba(20, 30, 60, 0.7);
            --bg-light: #141832;
            --primary-cyan: #00F0FF;
            --accent-red: #FF3D71;
            --text-white: #ffffff;
            --text-gray: #b0b8d0;
            --text-muted: #6b7280;
            --border-color: rgba(0, 240, 255, 0.15);
            --border-active: rgba(0, 240, 255, 0.6);
            --shadow-card: 0 8px 32px rgba(0, 240, 255, 0.08);
            --shadow-btn: 0 0 20px rgba(0, 240, 255, 0.4);
            --radius-card: 16px;
            --radius-btn: 8px;
            --radius-input: 8px;
            --radius-metric: 12px;
            --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
            --font-sans: 'MiSans', 'PingFang SC', 'Helvetica Neue', sans-serif;
        }

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

        body {
            font-family: var(--font-sans);
            background: radial-gradient(circle at 20% 10%, #141832 0%, #0A0E27 70%);
            color: var(--text-white);
            line-height: 1.7;
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* 左侧 App Shell 导航 */
        .app-nav {
            width: 72px;
            min-width: 72px;
            height: 100vh;
            position: sticky;
            top: 0;
            left: 0;
            background: #0A0E27;
            border-right: 1px solid rgba(0, 240, 255, 0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px 0;
            z-index: 50;
            backdrop-filter: blur(10px);
        }
        .nav-logo {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #00F0FF 0%, #0066ff 100%);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 14px;
            color: #0A0E27;
            margin-bottom: 32px;
            box-shadow: 0 0 15px rgba(0,240,255,0.5);
            position: relative;
        }
        .nav-logo span {
            display: block;
            transform: rotate(-10deg);
        }
        .nav-menu {
            display: flex;
            flex-direction: column;
            gap: 24px;
            list-style: none;
            width: 100%;
            align-items: center;
        }
        .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            text-decoration: none;
            color: var(--text-muted);
            font-size: 12px;
            transition: all 0.2s;
            position: relative;
            width: 100%;
            padding: 8px 0;
        }
        .nav-item i {
            font-size: 20px;
            transition: color 0.2s;
        }
        .nav-item.active {
            color: var(--primary-cyan);
        }
        .nav-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 3px;
            background: var(--primary-cyan);
            box-shadow: 0 0 15px var(--primary-cyan);
            border-radius: 0 4px 4px 0;
        }
        .nav-item:hover {
            color: var(--primary-cyan);
        }

        /* 主内容区 */
        .main-content {
            flex: 1;
            overflow-x: hidden;
            padding-bottom: 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 移动端汉堡菜单 */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 56px;
            background: rgba(10, 14, 39, 0.9);
            backdrop-filter: blur(20px);
            z-index: 60;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            border-bottom: 1px solid rgba(0,240,255,0.1);
        }
        .mobile-logo {
            font-weight: 700;
            font-size: 18px;
            color: var(--primary-cyan);
            letter-spacing: 1px;
        }
        .hamburger {
            font-size: 24px;
            color: var(--primary-cyan);
            background: none;
            border: none;
            cursor: pointer;
        }
        .mobile-drawer {
            position: fixed;
            top: 56px;
            left: 0;
            width: 100%;
            background: rgba(10, 14, 39, 0.95);
            backdrop-filter: blur(24px);
            flex-direction: column;
            padding: 20px;
            display: none;
            z-index: 55;
            border-bottom: 1px solid rgba(0,240,255,0.2);
        }
        .mobile-drawer a {
            padding: 14px;
            color: #ccc;
            text-decoration: none;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            font-size: 16px;
        }
        .mobile-drawer a.active {
            color: var(--primary-cyan);
        }

        /* 区块通用 */
        section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 12px;
            background: linear-gradient(180deg, #fff 0%, #a0b0e0 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .section-subtitle {
            font-size: 18px;
            color: var(--text-gray);
            margin-bottom: 48px;
            max-width: 700px;
        }

        /* 玻璃卡片 */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            border-radius: var(--radius-card);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
            transition: all 0.25s ease;
        }
        .glass-card:hover {
            border-color: var(--border-active);
            box-shadow: 0 12px 40px rgba(0,240,255,0.15);
            transform: translateY(-4px);
        }

        /* 按钮系统 */
        .btn-primary {
            background: linear-gradient(135deg, #00F0FF 0%, #0088ff 100%);
            border: none;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            color: #0A0E27;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 0 18px rgba(0,240,255,0.5);
            display: inline-block;
            text-decoration: none;
            letter-spacing: 0.5px;
        }
        .btn-primary:hover {
            box-shadow: 0 0 32px rgba(0,240,255,0.8);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--primary-cyan);
            color: var(--primary-cyan);
            padding: 13px 30px;
            border-radius: var(--radius-btn);
            font-weight: 500;
            transition: all 0.3s;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-outline:hover {
            background: rgba(0,240,255,0.12);
            box-shadow: 0 0 15px rgba(0,240,255,0.3);
        }

        /* Hero */
        .hero-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.9fr;
            gap: 40px;
            align-items: center;
        }
        .hero-title {
            font-size: 48px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 20px;
        }
        .hero-highlight {
            color: var(--primary-cyan);
        }
        .hero-desc {
            font-size: 18px;
            color: var(--text-gray);
            margin-bottom: 32px;
        }
        .hero-cta-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-visual {
            position: relative;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            border-radius: 24px;
            height: 380px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(0,240,255,0.2);
        }
        .live-badge {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(0,0,0,0.7);
            backdrop-filter: blur(8px);
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 14px;
            color: var(--primary-cyan);
        }
        .data-overlay {
            background: rgba(10,14,39,0.75);
            backdrop-filter: blur(8px);
            padding: 20px;
            border-radius: 20px;
            display: flex;
            gap: 24px;
        }
        .stat-digit {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 800;
            color: var(--primary-cyan);
        }

        /* 指标卡 */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .metric-card {
            padding: 24px;
            text-align: center;
        }
        .metric-value {
            font-family: var(--font-mono);
            font-size: 40px;
            font-weight: 800;
            color: var(--primary-cyan);
            margin-bottom: 8px;
        }
        .trend-up {
            color: var(--accent-red);
        }

        /* 服务网格 */
        .services-grid {
            display: grid;
            grid-template-columns: 1fr 1.15fr 1fr;
            gap: 24px;
            align-items: start;
        }
        .service-card {
            padding: 32px 24px;
            position: relative;
        }
        .popular-badge {
            position: absolute;
            top: -10px;
            right: 20px;
            background: var(--accent-red);
            color: white;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
        }

        /* 对比 */
        .compare-wrapper {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            gap: 20px;
            align-items: center;
        }
        .vs-divider {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary-cyan);
            text-shadow: 0 0 15px cyan;
        }
        .compare-card {
            padding: 32px;
        }
        .red-arrow {
            color: #ff4d6d;
        }
        .green-arrow {
            color: #00f0ff;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid rgba(255,255,255,0.08);
            padding: 18px 0;
            cursor: pointer;
        }
        .faq-question {
            font-size: 18px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: #ccc;
            font-size: 15px;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            margin-top: 12px;
        }

        /* 表单 */
        .contact-form input, .contact-form textarea {
            width: 100%;
            background: #0b1120;
            border: 1px solid rgba(0,240,255,0.3);
            border-radius: var(--radius-input);
            padding: 14px;
            color: white;
            margin-bottom: 16px;
            transition: 0.2s;
        }
        .contact-form input:focus {
            border-color: var(--primary-cyan);
            box-shadow: 0 0 10px rgba(0,240,255,0.4);
            outline: none;
        }

        footer {
            border-top: 1px solid rgba(0,240,255,0.1);
            padding: 24px 0;
            text-align: center;
            color: var(--text-muted);
        }

        @media (max-width: 768px) {
            .app-nav {
                display: none;
            }
            .mobile-header {
                display: flex;
            }
            .mobile-drawer.active {
                display: flex;
            }
            .hero-grid, .metrics-grid, .services-grid, .compare-wrapper {
                grid-template-columns: 1fr;
            }
            .metrics-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-title {
                font-size: 32px;
            }
            section {
                padding: 40px 0;
            }
        }