/* roulang page: index */
:root {
            --primary-navy: #1E3A8A;
            --primary-cyan: #0EA5E9;
            --accent-orange: #F97316;
            --dark-surface: #0F172A;
            --bg-slate: #F8FAFC;
            --border-light: #E2E8F0;
        }

        body {
            font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: #334155;
            background-color: #FFFFFF;
            -webkit-font-smoothing: antialiased;
        }

        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 138, 0.88) 100%);
        }

        .card-custom-shadow {
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-custom-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
        }

        .tech-border-glow {
            border: 1px solid rgba(14, 165, 233, 0.3);
            box-shadow: inset 0 0 20px rgba(14, 165, 233, 0.08);
        }

        .nav-link {
            transition: color 0.2s ease;
        }
        .nav-link:hover {
            color: var(--primary-cyan);
        }

        .countdown-item {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }