/* roulang page: index */
:root {
            --primary: #2563eb;
            --primary-hover: #1d4ed8;
            --secondary: #0ea5e9;
            --text-main: #0f172a;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --border-soft: #e2e8f0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            overflow-x: hidden;
        }
        .hero-banner-mask {
            background: linear-gradient(90deg, rgba(255,255,255,0.96) 0%, rgba(248,250,252,0.92) 55%, rgba(241,245,249,0.7) 100%);
        }
        .card-trans {
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-trans:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
        }
        .tab-content { display: none; }
        .tab-content.active { display: block; }
        .faq-item.active .faq-answer { display: block; }
        .faq-item.active .faq-icon { transform: rotate(180deg); }