/* roulang page: index */
:root {
            --primary: #1D63FF;
            --primary-hover: #1752D8;
            --secondary: #00D2A0;
            --accent: #FF6B35;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: #FFFFFF;
        }
        .hero-pattern {
            background-image: radial-gradient(rgba(29, 99, 255, 0.08) 1px, transparent 1px);
            background-size: 24px 24px;
        }
        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(29, 99, 255, 0.12);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .faq-icon {
            transform: rotate(180deg);
        }