/* roulang page: index */
:root {
            --primary: #0f172a;
            --primary-dark: #020617;
            --accent: #0284c7;
            --accent-glow: #0ea5e9;
            --surface-light: #f8fafc;
            --border-dim: #e2e8f0;
            --text-main: #1e293b;
            --text-muted: #64748b;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            line-height: 1.75;
        }
        .hero-pattern {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(2, 6, 23, 0.92) 100%), url('/assets/images/bafcbd0ebaa44985.webp');
            background-size: cover;
            background-position: center;
        }
        .deep-dark-pattern {
            background-image: linear-gradient(180deg, rgba(2, 6, 23, 0.98) 0%, rgba(15, 23, 42, 0.96) 100%), url('/assets/images/0666f669c96d3569.webp');
            background-size: cover;
            background-position: center;
        }
        .tech-card {
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }
        .tech-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -10px rgba(2, 132, 199, 0.15);
            border-color: #38bdf8;
        }