/* roulang page: index */
:root {
            --primary-blue: #2563eb;
            --secondary-dark: #0f172a;
            --accent-green: #10b981;
            --bg-light: #f8fafc;
            --text-main: #1e293b;
            --text-muted: #64748b;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-main);
            overflow-x: hidden;
        }
        .card-shadow {
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.06);
        }
        .gradient-hero-mask {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 41, 59, 0.85) 100%);
        }
        .smooth-scroll {
            scroll-behavior: smooth;
        }