/* roulang page: index */
:root {
            --bg-deep: #0B0E21;
            --bg-card: rgba(20, 24, 50, 0.7);
            --purple-nebula: #7B2FBE;
            --cyan-aurora: #00E5FF;
            --cyan-aurora-dim: rgba(0, 229, 255, 0.15);
            --text-primary: #EDF2F9;
            --text-secondary: #B0B8CC;
            --text-muted: #6B728A;
            --border-glow: rgba(123, 47, 190, 0.45);
            --border-cyan: rgba(0, 229, 255, 0.35);
            --shadow-card: 0 12px 32px rgba(123, 47, 190, 0.25), 0 0 0 1px rgba(0, 229, 255, 0.15) inset;
            --shadow-glow-cyan: 0 0 20px rgba(0, 229, 255, 0.45);
            --radius-card: 18px;
            --radius-btn: 50px;
            --font-heading: 'Orbitron', 'Inter', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            --font-body: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --transition-smooth: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
            --sidebar-width: 80px;
            --sidebar-expanded-width: 260px;
            --topbar-height: 64px;
        }

        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            background-color: var(--bg-deep);
            color: var(--text-secondary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
            background-image: radial-gradient(circle at 20% 10%, rgba(123, 47, 190, 0.12) 0%, transparent 40%),
                              radial-gradient(circle at 80% 60%, rgba(0, 229, 255, 0.08) 0%, transparent 45%);
            background-attachment: fixed;
        }

        a {
            text-decoration: none;
            color: var(--cyan-aurora);
            transition: var(--transition-smooth);
        }

        a:hover {
            color: #fff;
        }

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

        button, input, textarea {
            font-family: var(--font-body);
        }

        h1, h2, h3, h4, .font-orbitron {
            font-family: var(--font-heading);
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.02em;
        }

        h1 {
            font-size: clamp(2.4rem, 6vw, 3.6rem);
            line-height: 1.2;
            margin-bottom: 1.2rem;
        }

        h2 {
            font-size: clamp(2rem, 4.5vw, 2.6rem);
            margin-bottom: 1rem;
        }

        h3 {
            font-size: 1.5rem;
            margin-bottom: 0.75rem;
        }

        .cyan-text {
            color: var(--cyan-aurora);
        }

        .gradient-text {
            background: linear-gradient(135deg, var(--cyan-aurora) 0%, var(--purple-nebula) 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* 侧边导航 App Shell */
        .app-sidebar {
            position: fixed;
            left: 0;
            top: 0;
            height: 100vh;
            width: var(--sidebar-width);
            background: rgba(11, 14, 33, 0.92);
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            border-right: 1px solid var(--border-glow);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 28px 0;
            z-index: 100;
            transition: width 0.25s ease;
            overflow-x: hidden;
        }

        .app-sidebar:hover {
            width: var(--sidebar-expanded-width);
        }

        .sidebar-logo {
            font-family: var(--font-heading);
            font-weight: 900;
            font-size: 1.4rem;
            color: #fff;
            margin-bottom: 48px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 16px;
        }

        .sidebar-logo .logo-icon {
            font-size: 2rem;
            color: var(--cyan-aurora);
        }

        .sidebar-nav {
            list-style: none;
            margin: 0;
            padding: 0;
            width: 100%;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .sidebar-nav li a {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 24px;
            color: var(--text-secondary);
            font-weight: 500;
            border-left: 3px solid transparent;
            transition: var(--transition-smooth);
            white-space: nowrap;
            font-size: 0.95rem;
        }

        .sidebar-nav li a i, .sidebar-nav li a .nav-icon {
            font-size: 1.3rem;
            width: 24px;
            text-align: center;
        }

        .sidebar-nav li a:hover,
        .sidebar-nav li a.active {
            color: #fff;
            border-left-color: var(--cyan-aurora);
            background: rgba(0, 229, 255, 0.08);
        }

        .main-content {
            margin-left: var(--sidebar-width);
            transition: margin-left 0.25s ease;
        }

        /* 移动端导航 */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--topbar-height);
            background: rgba(11, 14, 33, 0.94);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid var(--border-glow);
            z-index: 99;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
        }

        .mobile-logo {
            font-family: var(--font-heading);
            font-weight: 900;
            font-size: 1.3rem;
            color: #fff;
        }

        .hamburger {
            background: transparent;
            border: none;
            color: var(--cyan-aurora);
            font-size: 1.8rem;
            cursor: pointer;
        }

        .mobile-drawer {
            position: fixed;
            top: 0;
            left: 0;
            width: 280px;
            height: 100vh;
            background: rgba(11, 14, 33, 0.96);
            backdrop-filter: blur(30px);
            border-right: 1px solid var(--border-glow);
            z-index: 200;
            transform: translateX(-100%);
            transition: transform 0.25s ease;
            padding: 32px 24px;
            display: flex;
            flex-direction: column;
        }

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

        .mobile-drawer .close-drawer {
            align-self: flex-end;
            background: transparent;
            border: none;
            color: #fff;
            font-size: 2rem;
            cursor: pointer;
        }

        .mobile-drawer ul {
            list-style: none;
            margin-top: 40px;
            padding: 0;
        }

        .mobile-drawer li a {
            display: block;
            padding: 16px 0;
            color: var(--text-secondary);
            border-bottom: 1px solid rgba(255,255,255,0.08);
            font-weight: 500;
        }

        /* 区块间距 */
        section {
            padding: 100px 0;
            position: relative;
        }

        .hero-section {
            min-height: 90vh;
            display: flex;
            align-items: center;
            padding-top: 40px;
        }

        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-radius: var(--radius-card);
            border: 1px solid var(--border-glow);
            box-shadow: var(--shadow-card);
            padding: 28px;
            transition: var(--transition-smooth);
        }

        .glass-card:hover {
            box-shadow: 0 18px 40px rgba(123, 47, 190, 0.4), 0 0 0 1px rgba(0, 229, 255, 0.35) inset;
            transform: translateY(-5px);
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--cyan-aurora) 0%, var(--purple-nebula) 100%);
            border: none;
            color: #fff;
            font-weight: 700;
            padding: 14px 38px;
            border-radius: var(--radius-btn);
            box-shadow: 0 0 22px rgba(0, 229, 255, 0.55);
            cursor: pointer;
            display: inline-block;
            text-align: center;
            transition: var(--transition-smooth);
            font-size: 1rem;
            letter-spacing: 0.5px;
        }

        .btn-primary:hover {
            box-shadow: 0 0 35px rgba(0, 229, 255, 0.8);
            transform: scale(1.03);
            color: #fff;
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--cyan-aurora);
            color: var(--cyan-aurora);
            font-weight: 600;
            padding: 12px 36px;
            border-radius: var(--radius-btn);
            transition: var(--transition-smooth);
        }

        .btn-outline:hover {
            background: rgba(0, 229, 255, 0.12);
            color: #fff;
        }

        /* 生态网格 */
        .eco-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .eco-item-large {
            grid-column: span 2;
        }

        /* 优势时间线 */
        .advantage-row {
            display: flex;
            align-items: center;
            margin-bottom: 40px;
            position: relative;
        }

        .timeline-dot {
            width: 18px;
            height: 18px;
            background: var(--cyan-aurora);
            border-radius: 50%;
            box-shadow: 0 0 24px var(--cyan-aurora);
            margin-right: 32px;
            flex-shrink: 0;
        }

        .stat-number {
            font-family: var(--font-heading);
            font-size: 2.8rem;
            font-weight: 900;
            background: linear-gradient(180deg, var(--cyan-aurora) 0%, var(--purple-nebula) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* 瀑布流 */
        .masonry-grid {
            columns: 3;
            column-gap: 24px;
        }

        .masonry-card {
            break-inside: avoid;
            margin-bottom: 24px;
        }

        .comparison-left {
            background: rgba(60, 60, 70, 0.35);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 20px;
            padding: 28px;
        }

        .comparison-right {
            background: rgba(123, 47, 190, 0.18);
            border: 1px solid var(--cyan-aurora);
            border-radius: 20px;
            padding: 28px;
        }

        .faq-item {
            border-bottom: 1px solid rgba(255,255,255,0.08);
            padding: 18px 0;
            cursor: pointer;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }

        .footer-link {
            color: #8892B0;
        }

        .footer-link:hover {
            color: var(--cyan-aurora);
        }

        @media (max-width: 1024px) {
            .app-sidebar {
                display: none;
            }
            .mobile-topbar {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--topbar-height);
            }
            .eco-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .masonry-grid {
                columns: 2;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .eco-grid {
                grid-template-columns: 1fr;
            }
            .eco-item-large {
                grid-column: span 1;
            }
            .masonry-grid {
                columns: 1;
            }
            .advantage-row {
                flex-direction: column;
                align-items: flex-start;
            }
            .comparison-left, .comparison-right {
                margin-bottom: 20px;
            }
        }