/* roulang page: index */
:root {
            --color-bg-base: #F6F8FA;
            --color-bg-surface: #FFFFFF;
            --color-dark-carbon: #1A1D20;
            --color-dark-titanium: #2D3238;
            --color-orange-laser: #FF5A1F;
            --color-border-line: #E2E6EA;
            --font-sans-industrial: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        }
        body {
            font-family: var(--font-sans-industrial);
            background-color: var(--color-bg-base);
            color: var(--color-dark-carbon);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .mono-num {
            font-family: 'Roboto', 'Din-Condensed', -apple-system, BlinkMacSystemFont, sans-serif;
            font-feature-settings: "tnum";
            font-variant-numeric: tabular-nums;
        }
        .card-mech {
            background-color: #FFFFFF;
            border: 1px solid var(--color-border-line);
            border-radius: 6px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 10px 25px -5px rgba(0,0,0,0.03);
            transition: all 0.25s ease-in-out;
        }
        .card-mech:hover {
            transform: translateY(-2px);
            border-color: #CBD5E1;
            box-shadow: 0 12px 30px -10px rgba(0,0,0,0.08);
        }
        .tech-grid-bg {
            background-image: radial-gradient(rgba(0, 0, 0, 0.08) 1px, transparent 0);
            background-size: 24px 24px;
        }
        .tech-dark-grid {
            background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 0);
            background-size: 24px 24px;
        }