/* roulang page: index */
:root {
            --primary: #0F52BA;
            --primary-hover: #0A3B86;
            --accent: #00A3E0;
            --text-heading: #0A192F;
            --text-body: #334155;
            --bg-page: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
        }
        body {
            background-color: var(--bg-page);
            color: var(--text-body);
            overflow-x: hidden;
        }
        .hero-bg {
            background: linear-gradient(135deg, rgba(10, 25, 47, 0.94) 0%, rgba(15, 82, 186, 0.88) 100%), url('/assets/images/c47720ad4045c369.webp') center/cover no-repeat;
        }
        .cta-bg {
            background: linear-gradient(135deg, rgba(15, 82, 186, 0.95) 0%, rgba(0, 163, 224, 0.9) 100%), url('/assets/images/430e61bb7e0c56e9.webp') center/cover no-repeat;
        }
        .chip-active {
            background-color: #0F52BA;
            color: #FFFFFF;
            border-color: #0F52BA;
        }
        .faq-content {
            transition: max-height 0.3s ease-out, opacity 0.25s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-content.open {
            max-height: 200px;
            opacity: 1;
        }
        .tab-btn.active {
            background-color: #0F52BA;
            color: #FFFFFF;
            border-color: #0F52BA;
        }
        .transition-lift {
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .transition-lift:hover {
            transform: translateY(-4px);
        }