/* roulang page: index */
:root {
            --bg-dark: #0A0D14;
            --surface-dark: #121722;
            --accent-green: #00E575;
            --accent-cyan: #00D2FF;
            --border-line: #232D42;
        }
        * {
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }
        body {
            background-color: var(--bg-dark);
            color: #E2E8F0;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .tech-grid {
            background-size: 40px 40px;
            background-image: 
                linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
        }
        .glow-border {
            border: 1px solid var(--border-line);
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .glow-border:hover {
            border-color: rgba(0, 229, 117, 0.4);
            box-shadow: 0 0 20px rgba(0, 229, 117, 0.12);
        }
        .metric-mono {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            font-feature-settings: 'tnum' on, 'lnum' on;
            letter-spacing: -0.03em;
        }
        .section-separator {
            border-top: 1px solid rgba(255, 255, 255, 0.07);
        }