/* roulang page: index */
:root {
            --bg-base: #0A0F1D;
            --bg-surface: #0F172A;
            --bg-card: #1E293B;
            --accent-cyan: #00F2FE;
            --accent-purple: #7928CA;
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
            --border-dim: rgba(51, 65, 85, 0.6);
        }
        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.8;
            overflow-x: hidden;
        }
        .glow-border {
            border: 1px solid var(--border-dim);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glow-border:hover {
            border-color: rgba(0, 242, 254, 0.5);
            box-shadow: 0 0 25px rgba(0, 242, 254, 0.15);
            transform: translateY(-4px);
        }
        .code-container {
            font-family: ui-monospace, "JetBrains Mono", Consolas, monospace;
        }
        .dot-ping {
            animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
        }
        @keyframes ping {
            75%, 100% {
                transform: scale(2);
                opacity: 0;
            }
        }