/* roulang page: index */
:root { --font-main: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
        body { font-family: var(--font-main); color: #334155; }
        .gradient-bg { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); }
        .nav-blur { backdrop-filter: blur(12px); background: rgba(255, 255, 255, 0.9); }
        .hover-lift { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        .hover-lift:hover { transform: translateY(-5px); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1); }