/* roulang page: index */
:root {
            --bg-deep: #060B19;
            --bg-panel: #0B1528;
            --border-glass: rgba(0, 210, 255, 0.16);
            --neon-blue: #00D2FF;
            --neon-green: #00F5A0;
        }
        body {
            background-color: var(--bg-deep);
            color: #E2E8F0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
        }
        .grid-mesh {
            background-image: radial-gradient(rgba(0, 210, 255, 0.08) 1px, transparent 1px),
                              linear-gradient(to bottom, #060B19 0%, #0B1528 50%, #060B19 100%);
            background-size: 32px 32px, 100% 100%;
        }
        .glass-panel {
            background: rgba(16, 28, 54, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glass-panel:hover {
            border-color: rgba(0, 210, 255, 0.38);
            box-shadow: 0 0 30px rgba(0, 210, 255, 0.18);
        }
        .glow-btn-primary {
            background: linear-gradient(135deg, #0066FF 0%, #00D2FF 100%);
            box-shadow: 0 0 20px rgba(0, 102, 255, 0.45);
            transition: all 0.25s ease;
        }
        .glow-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(0, 210, 255, 0.7);
        }
        .glow-btn-primary:active {
            transform: scale(0.98);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .faq-icon {
            transform: rotate(180deg);
            color: #00D2FF;
        }
        details[open] {
            border-color: rgba(0, 210, 255, 0.45);
            box-shadow: 0 0 20px rgba(0, 210, 255, 0.12);
        }