/* roulang page: index */
:root {
            --primary-gradient: linear-gradient(135deg, #3B41C5 0%, #2C2D84 100%);
            --accent-gradient: linear-gradient(135deg, #F59E0B 0%, #F97316 100%);
            --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.01);
            --card-shadow-hover: 0 20px 30px -10px rgba(59, 65, 197, 0.15), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: #1E293B;
            overflow-x: hidden;
        }
        .bg-brand-gradient { background: var(--primary-gradient); }
        .bg-accent-gradient { background: var(--accent-gradient); }
        .text-brand-gradient {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .card-custom {
            border-radius: 20px;
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
        }
        .hero-mesh {
            background-image: radial-gradient(at 10% 20%, rgba(59, 65, 197, 0.08) 0px, transparent 50%),
                              radial-gradient(at 90% 80%, rgba(245, 158, 11, 0.06) 0px, transparent 50%);
        }
        .smooth-scroll { scroll-behavior: smooth; }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-item.active .accordion-content {
            max-height: 400px;
            opacity: 1;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }