/* roulang page: index */
:root {
            --bg-primary: #0B0F19;
            --bg-secondary: #111827;
            --bg-elevated: #1F2937;
            --color-primary: #2563EB;
            --color-accent: #06B6D4;
            --color-warning: #F97316;
            --text-main: #FFFFFF;
            --text-muted: #94A3B8;
            --text-dim: #64748B;
            --border-glass: rgba(255, 255, 255, 0.1);
            --border-glow: rgba(6, 182, 212, 0.45);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --shadow-glow: 0 0 24px rgba(59, 130, 246, 0.5);
            --shadow-cyan: 0 0 20px rgba(6, 182, 212, 0.4);
        }

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

        body {
            background-color: var(--bg-primary);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.65;
            overflow-x: hidden;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        /* 玻璃拟态卡片系统 */
        .glass-card {
            background: rgba(17, 24, 39, 0.68);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .glass-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-glow);
            box-shadow: 0 12px 32px -8px rgba(6, 182, 212, 0.22);
        }

        .glass-panel {
            background: linear-gradient(145deg, rgba(31, 41, 55, 0.75) 0%, rgba(17, 24, 39, 0.88) 100%);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-xl);
        }

        /* 发光按钮系统 */
        .btn-glow {
            background: linear-gradient(135deg, #06B6D4 0%, #2563EB 100%);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 0.75rem;
            box-shadow: var(--shadow-glow);
            transition: all 0.25s ease;
            position: relative;
            overflow: hidden;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn-glow:hover {
            transform: translateY(-2px) scale(1.01);
            box-shadow: 0 0 32px rgba(6, 182, 212, 0.75);
            filter: brightness(1.08);
        }

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

        .btn-outline-cyber {
            background: rgba(15, 23, 42, 0.6);
            color: #E2E8F0;
            border: 1px solid rgba(59, 130, 246, 0.45);
            border-radius: 0.75rem;
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn-outline-cyber:hover {
            background: rgba(37, 99, 235, 0.18);
            border-color: #06B6D4;
            color: #FFFFFF;
            box-shadow: 0 0 16px rgba(6, 182, 212, 0.3);
        }

        /* 导航样式与激活状态 */
        .nav-link {
            position: relative;
            color: #94A3B8;
            font-weight: 500;
            padding: 0.5rem 0.25rem;
        }

        .nav-link:hover, .nav-link.active {
            color: #FFFFFF;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #06B6D4, #3B82F6);
            transition: width 0.25s ease;
        }

        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }

        /* 板块分隔与网格背景 */
        .section-dark {
            background-color: #0B0F19;
            position: relative;
        }

        .section-alt {
            background: linear-gradient(180deg, #0E1422 0%, #111827 50%, #0B0F19 100%);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            position: relative;
        }

        .cyber-grid-bg {
            background-image: 
                linear-gradient(to right, rgba(59, 130, 246, 0.06) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(59, 130, 246, 0.06) 1px, transparent 1px);
            background-size: 36px 36px;
        }

        /* 徽章与发光数字 */
        .badge-cyber {
            background: rgba(6, 182, 212, 0.14);
            border: 1px solid rgba(6, 182, 212, 0.4);
            color: #22D3EE;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            letter-spacing: 0.04em;
        }

        .metric-glow {
            background: linear-gradient(135deg, #FFFFFF 20%, #38BDF8 60%, #3B82F6 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            filter: drop-shadow(0 0 18px rgba(6, 182, 212, 0.35));
        }

        /* 横向滚动条美化 */
        .custom-scrollbar::-webkit-scrollbar {
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-track {
            background: rgba(15, 23, 42, 0.8);
            border-radius: 8px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background: linear-gradient(90deg, #2563EB, #06B6D4);
            border-radius: 8px;
        }

        /* 原生 details 手风琴动画 */
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary ~ * {
            animation: slideDown 0.25s ease-in-out;
        }
        @keyframes slideDown {
            0% { opacity: 0; transform: translateY(-6px); }
            100% { opacity: 1; transform: translateY(0); }
        }

        /* 响应式微调 */
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2rem !important;
                line-height: 1.25 !important;
            }
        }