/* roulang page: index */
:root {
            --primary-titanium: #141c27;
            --cyber-cyan: #0eceb3;
            --screen-green: #18bf6c;
            --bg-canvas: #f7f9fb;
            --card-border: #e2e8f0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-canvas);
            color: #1e293b;
            line-height: 1.7;
        }
        .header-glass {
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background: rgba(20, 28, 39, 0.94);
        }
        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
            transition: all 0.25s ease-in-out;
        }
        .card-shadow:hover {
            box-shadow: 0 12px 28px -4px rgba(0, 0, 0, 0.1);
            transform: translateY(-4px);
        }
        .code-pattern {
            background-image: radial-gradient(rgba(14, 206, 179, 0.12) 1px, transparent 1px);
            background-size: 24px 24px;
        }