/* roulang page: index */
:root {
            --bg-deep: #0D1117;
            --bg-card: #161B22;
            --color-cyan: #00F2FE;
            --color-purple: #7928CA;
            --color-orange: #FF5E3A;
            --text-main: #F0F6FC;
            --text-muted: #8B949E;
            --border-line: rgba(255, 255, 255, 0.08);
        }
        body {
            background-color: var(--bg-deep);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
        }
        .text-cyan { color: var(--color-cyan); }
        .bg-cyan { background-color: var(--color-cyan); }
        .border-subtle { border-color: var(--border-line); }
        .hero-mesh {
            background: radial-gradient(circle at 80% 20%, rgba(121, 40, 202, 0.18) 0%, transparent 50%),
                        radial-gradient(circle at 20% 80%, rgba(0, 242, 254, 0.15) 0%, transparent 50%);
        }
        .card-panel {
            background: rgba(22, 27, 34, 0.85);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-line);
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .card-panel:hover {
            border-color: rgba(0, 242, 254, 0.4);
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0, 242, 254, 0.08);
        }
        .nav-blur {
            background: rgba(13, 17, 23, 0.88);
            backdrop-filter: blur(16px);
        }
        .stat-glow {
            text-shadow: 0 0 20px rgba(0, 242, 254, 0.45);
        }