/* roulang page: index */
:root {
            --primary: #0E7090;
            --primary-light: #06B6D4;
            --bg-base: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --card-radius: 20px;
            --shadow-normal: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 20px 25px -5px rgba(14, 112, 144, 0.12);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-base);
            color: var(--text-main);
            overflow-x: hidden;
            line-height: 1.6;
        }
        .main-card {
            border-radius: var(--card-radius);
            box-shadow: var(--shadow-normal);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .main-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .pill-badge {
            border-radius: 9999px;
            border: 1px solid rgba(6, 182, 212, 0.25);
            display: inline-flex;
            align-items: center;
        }
        .hero-video-mask {
            background: linear-gradient(135deg, rgba(11, 19, 43, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%);
        }
        .cta-gradient {
            background: linear-gradient(135deg, #0E7090 0%, #0F172A 100%);
        }
        .tab-btn.active {
            background-color: #0E7090;
            color: #FFFFFF;
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-content.open {
            max-height: 300px;
        }