/* roulang page: index */
:root {
            --color-primary: #0F1E24;
            --color-accent: #E65A14;
            --color-signal: #10B981;
            --color-surface: #F6F8F9;
            --font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: var(--font-family);
            background-color: #F8FAFC;
            color: #334155;
            line-height: 1.6;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(10, 17, 20, 0.88), rgba(15, 30, 36, 0.94)), url('/assets/images/0d885cbf973c7bbd.jpg');
            background-size: cover;
            background-position: center;
        }
        .night-bg {
            background-image: linear-gradient(rgba(10, 17, 20, 0.95), rgba(15, 30, 36, 0.96)), url('/assets/images/320743c78b7e3e7d.jpg');
            background-size: cover;
            background-position: center;
        }
        .glass-panel {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.12);
        }
        .text-gradient {
            background: linear-gradient(135deg, #FFFFFF 20%, #CBD5E1 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hover-card {
            transition: all 0.25s ease;
        }
        .hover-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -10px rgba(15, 30, 36, 0.15);
        }