/* roulang page: index */
:root {
            --primary: #1E40AF;
            --accent: #0284C7;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-sub: #334155;
            --text-muted: #64748B;
        }
        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-light); color: var(--text-sub); }
        .hero-banner { background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92), rgba(30, 64, 175, 0.85)), url('/assets/images/cfd5e7a096988f03.webp'); background-size: cover; background-position: center; }
        .custom-card { transition: all 0.3s ease; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05); }
        .custom-card:hover { transform: translateY(-4px); box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04); }
        details > summary { list-style: none; }
        details > summary::-webkit-details-marker { display: none; }
        details[open] summary svg { transform: rotate(180deg); }