/* roulang page: index */
:root {
            --primary: #1A56DB;
            --primary-hover: #1E40AF;
            --accent-cyan: #0EA5E9;
            --accent-green: #10B981;
            --text-dark: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
            --bg-page: #F8FAFC;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-body);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }
        .hero-bg {
            background-image: linear-gradient(180deg, rgba(248, 250, 252, 0.88) 0%, rgba(248, 250, 252, 0.98) 100%), url('/assets/images/5b34fd6e40849219.png');
            background-size: cover;
            background-position: center;
        }
        .dark-surface {
            background-color: #0F172A;
            background-image: radial-gradient(rgba(30, 64, 175, 0.15) 1px, transparent 0);
            background-size: 24px 24px;
        }
        .card-custom {
            box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
            transform: translateY(-2px);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, opacity 0.2s ease-out;
            opacity: 0;
        }
        .accordion-content.active {
            max-height: 500px;
            opacity: 1;
        }