/* roulang page: index */
:root {
            --primary: #0ea5e9;
            --accent: #00ff88;
            --bg-dark: #070e18;
            --surface-dark: #0f1c2e;
            --text-main: #0f172a;
            --text-muted: #64748b;
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #f8fafc;
            overflow-x: hidden;
        }
        .hero-overlay {
            background: linear-gradient(135deg, rgba(7, 14, 24, 0.92) 0%, rgba(14, 30, 52, 0.85) 60%, rgba(14, 165, 233, 0.45) 100%);
        }
        .dark-glass {
            background: rgba(15, 28, 46, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .light-card {
            background: #ffffff;
            border: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .light-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 25px -4px rgba(14, 165, 233, 0.12);
            border-color: rgba(14, 165, 233, 0.3);
        }
        .neon-glow {
            text-shadow: 0 0 12px rgba(0, 255, 136, 0.4);
        }