/* roulang page: index */
:root {
            --bg-dark: #0B0D17;
            --card-surface: #1A2234;
            --brand-primary: #6366F1;
            --brand-secondary: #06B6D4;
            --brand-accent: #10B981;
            --text-main: #F3F4F6;
            --text-muted: #9CA3AF;
            --border-glass: rgba(51, 65, 85, 0.6);
        }
        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #A5B4FC 0%, #06B6D4 50%, #34D399 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .border-glow:hover {
            border-color: rgba(6, 182, 212, 0.5);
            box-shadow: 0 10px 30px rgba(99, 102, 241, 0.18);
        }
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }