/* roulang page: index */
:root {
            --color-navy: #0f2744;
            --color-blue: #1a56db;
            --color-amber: #e37426;
            --color-cyan: #0ea5e9;
            --color-bg-alt: #f8fafc;
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        body {
            font-family: var(--font-stack);
            color: #1e293b;
            background-color: #ffffff;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .text-tight { letter-spacing: -0.02em; }
        .glass-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
        }
        .card-hover {
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px -8px rgba(15, 39, 68, 0.12);
            border-color: rgba(26, 86, 219, 0.35);
        }
        .btn-gradient {
            background: linear-gradient(135deg, #1a56db 0%, #0ea5e9 100%);
            transition: all 0.2s ease;
        }
        .btn-gradient:hover {
            opacity: 0.95;
            box-shadow: 0 8px 20px -4px rgba(26, 86, 219, 0.4);
            transform: translateY(-1px);
        }
        .btn-gradient:active {
            transform: scale(0.98);
        }
        .hero-bg {
            background: linear-gradient(rgba(7, 22, 38, 0.88), rgba(15, 39, 68, 0.92)), url('/assets/images/0707cde1a8816962.webp') center/cover no-repeat;
        }
        details summary::-webkit-details-marker { display: none; }