/* roulang page: index */
:root {
            --primary: #00BFA5;
            --primary-dark: #00897B;
            --accent-purple: #6366F1;
            --bg-light: #F8FAFC;
            --bg-slate: #F1F5F9;
            --text-dark: #1E293B;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
            letter-spacing: -0.01em;
            background-color: var(--bg-light);
            color: var(--text-dark);
            overflow-x: hidden;
        }
        .hero-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.88), rgba(11, 19, 43, 0.94)), url('/assets/images/d02a5f4bd1258750.webp');
            background-size: cover;
            background-position: center;
        }
        .section-dark {
            background-color: #0B132B;
        }
        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(0, 191, 165, 0.12), 0 8px 10px -6px rgba(0, 191, 165, 0.08);
        }
        .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: 300px;
            opacity: 1;
        }