/* roulang page: index */
:root {
            --primary: #0F172A;
            --primary-card: #1E293B;
            --accent: #06B6D4;
            --accent-green: #10B981;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-color: #E2E8F0;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.7;
            scroll-behavior: smooth;
        }
        .hero-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94), rgba(11, 15, 25, 0.98)), url('/assets/images/9c2cfe760a8cfe77.webp');
            background-size: cover;
            background-position: center;
        }
        .cta-dark-bg {
            background-image: linear-gradient(135deg, rgba(11, 15, 25, 0.96), rgba(15, 23, 42, 0.92)), url('/assets/images/147572bb1fdffa6a.png');
            background-size: cover;
            background-position: center;
        }
        .glass-panel {
            background: rgba(30, 41, 59, 0.7);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 28px -8px rgba(15, 23, 42, 0.08);
        }
        .accordion-content {
            transition: max-height 0.35s ease, opacity 0.3s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.open {
            max-height: 300px;
            opacity: 1;
        }