/* roulang page: index */
:root {
            --primary: #6C3CE9;
            --primary-hover: #582cd1;
            --accent-cyan: #00F0FF;
            --accent-pink: #FF3366;
            --bg-body: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
        }

        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-body);
            color: var(--text-body);
            line-height: 1.75;
            overflow-x: hidden;
        }

        .hero-bg {
            background-image: linear-gradient(135deg, rgba(13, 14, 21, 0.88), rgba(108, 60, 233, 0.78)), url('/assets/images/c8cd1ff64c0d3291.webp');
            background-size: cover;
            background-position: center;
        }

        .dark-tech-bg {
            background-image: linear-gradient(180deg, rgba(13, 14, 21, 0.95), rgba(22, 25, 38, 0.98)), url('/assets/images/5c4599776598559e.webp');
            background-size: cover;
            background-position: center;
        }

        .cta-box-bg {
            background-image: linear-gradient(135deg, rgba(108, 60, 233, 0.92), rgba(13, 14, 21, 0.95)), url('/assets/images/9c63e6ea6096572b.webp');
            background-size: cover;
            background-position: center;
        }

        .card-glow {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid rgba(226, 232, 240, 0.9);
        }

        .card-glow:hover {
            transform: translateY(-4px);
            box-shadow: 0 15px 30px -10px rgba(108, 60, 233, 0.15);
            border-color: rgba(108, 60, 233, 0.3);
        }

        .btn-gradient {
            background: linear-gradient(135deg, #6C3CE9 0%, #00F0FF 100%);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .btn-gradient:hover {
            opacity: 0.95;
            box-shadow: 0 8px 25px rgba(108, 60, 233, 0.35);
            transform: translateY(-2px);
        }

        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary i {
            transform: rotate(180deg);
        }