/* roulang page: index */
:root {
            --primary: #0A2540;
            --accent: #0066FF;
            --highlight: #00D4B2;
            --dark-bg: #0B132B;
            --surface: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
        }
        .hero-banner {
            background-image: linear-gradient(to bottom, rgba(10, 37, 64, 0.88), rgba(11, 19, 43, 0.95)), url('/assets/images/f5ecd06dba29b496.webp');
            background-size: cover;
            background-position: center;
        }
        .dark-strip {
            background-image: linear-gradient(135deg, rgba(11, 19, 43, 0.96), rgba(10, 37, 64, 0.98)), url('/assets/images/dc04b3aac5c8dc2f.webp');
            background-size: cover;
            background-position: center;
        }
        .card-custom {
            border: 1px solid var(--border-color);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(10, 37, 64, 0.08);
            border-color: #CBD5E1;
        }
        .nav-link {
            transition: color 0.2s ease;
        }
        .nav-link:hover {
            color: var(--accent);
        }