/* roulang page: index */
:root {
            --primary-navy: #0B192C;
            --secondary-blue: #1E3E62;
            --accent-cyan: #008DDA;
            --accent-glow: #41C9E2;
            --alert-orange: #F97316;
            --surface-light: #F8FAFC;
            --surface-alt: #F1F5F9;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-light: #E2E8F0;
        }

        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
        }

        .gradient-text {
            background: linear-gradient(135deg, #008DDA 0%, #41C9E2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .gradient-dark-text {
            background: linear-gradient(135deg, #FFFFFF 30%, #94A3B8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .industrial-grid-bg {
            background-image: radial-gradient(rgba(0, 141, 218, 0.12) 1px, transparent 1px);
            background-size: 28px 28px;
        }

        .card-hover-effect {
            transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.28s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.28s ease;
        }

        .card-hover-effect:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(11, 25, 44, 0.08), 0 10px 10px -5px rgba(11, 25, 44, 0.04);
            border-color: #CBD5E1;
        }

        details summary::-webkit-details-marker {
            display: none;
        }

        details[open] summary .faq-icon {
            transform: rotate(180deg);
            color: #008DDA;
        }