/* roulang page: index */
:root {
            --primary: #1D4ED8;
            --primary-dark: #1E40AF;
            --accent: #0284C7;
            --accent-green: #10B981;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --card-border: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-main);
            overflow-x: hidden;
        }
        .custom-card-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .custom-card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(29, 78, 216, 0.1), 0 10px 10px -5px rgba(29, 78, 216, 0.04);
        }
        .hero-pattern {
            background-color: #0f172a;
            background-image: radial-gradient(#1e40af 0.75px, transparent 0.75px), radial-gradient(#0284c7 0.75px, #0f172a 0.75px);
            background-size: 30px 30px;
            background-position: 0 0, 15px 15px;
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-content.active {
            max-height: 500px;
            transition: max-height 0.4s ease-in;
        }