/* roulang page: index */
:root {
            --bg-obsidian: #0B0F17;
            --bg-silicon: #131B26;
            --bg-titanium: #F8FAFC;
            --primary-ion: #007A99;
            --primary-hover: #00A3C4;
            --border-light: #E2E8F0;
            --border-dark: rgba(255, 255, 255, 0.08);
            --text-main: #0F172A;
            --text-muted: #475569;
        }
        *, *::before, *::after {
            box-sizing: border-box;
        }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }
        .tabular-nums {
            font-variant-numeric: tabular-nums;
        }
        .card-hover {
            transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            border-color: var(--primary-hover);
            box-shadow: 0 12px 28px -6px rgba(0, 122, 153, 0.12), 0 4px 10px rgba(0, 0, 0, 0.04);
        }
        .cleanroom-pattern {
            background-image: radial-gradient(rgba(0, 122, 153, 0.12) 1px, transparent 1px);
            background-size: 24px 24px;
        }