/* roulang page: index */
:root {
            --bg-deep: #070B14;
            --bg-card: rgba(15, 23, 42, 0.75);
            --border-glow: rgba(0, 240, 255, 0.25);
            --accent-cyan: #00F0FF;
            --accent-blue: #3B82F6;
        }
        body {
            background-color: var(--bg-deep);
            color: #E2E8F0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-image: radial-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px), radial-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px);
            background-size: 36px 36px;
            background-position: 0 0, 18px 18px;
        }
        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glow);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
        }
        .btn-glow {
            background: linear-gradient(135deg, #00F0FF 0%, #3B82F6 100%);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.65);
        }
        .btn-outline {
            border: 1px solid rgba(0, 240, 255, 0.4);
            background: rgba(15, 23, 42, 0.6);
            transition: all 0.25s ease;
        }
        .btn-outline:hover {
            border-color: #00F0FF;
            background: rgba(0, 240, 255, 0.1);
            color: #00F0FF;
        }
        details summary::-webkit-details-marker {
            display: none;
        }