/* roulang page: index */
:root {
            --brand-cyan: #00D2B4;
            --brand-navy: #0B111E;
            --brand-dark: #090D14;
            --brand-card: #151D2A;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: rgba(226, 232, 240, 0.8);
            --border-dark: rgba(30, 41, 59, 0.7);
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "HarmonyOS Sans", "Microsoft YaHei UI", sans-serif;
            background-color: #F8FAFC;
            color: var(--text-body);
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #00D2B4 0%, #38BDF8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .bg-mesh-dark {
            background-color: #090D14;
            background-image: radial-gradient(rgba(0, 210, 180, 0.12) 1px, transparent 1px), radial-gradient(rgba(56, 189, 248, 0.08) 1px, #090D14 1px);
            background-size: 40px 40px;
            background-position: 0 0, 20px 20px;
        }
        .glass-panel {
            background: rgba(17, 24, 39, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .glass-panel-light {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(226, 232, 240, 0.8);
        }
        .glow-cyan {
            box-shadow: 0 0 25px -5px rgba(0, 210, 180, 0.3);
        }
        .accordion-content {
            transition: max-height 0.35s ease, opacity 0.3s ease;
        }