/* roulang page: index */
:root {
            --primary: #1e3a8a;
            --primary-dark: #0b0f19;
            --accent: #2563eb;
            --teal: #0d9488;
            --bg-light: #f8fafc;
            --border-color: #e2e8f0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: #1e293b;
            background-color: #f8fafc;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .hero-bg {
            background: linear-gradient(135deg, rgba(15, 32, 39, 0.92) 0%, rgba(30, 60, 114, 0.88) 100%), url('/assets/images/c3b1619ac158e0cf.webp') center/cover no-repeat;
        }
        .dark-section-bg {
            background: linear-gradient(180deg, #0b0f19 0%, #111827 100%);
        }
        .glass-header {
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
        }
        .custom-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
        }
        .custom-shadow-hover:hover {
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
            transform: translateY(-2px);
        }
        details > summary::-webkit-details-marker {
            display: none;
        }