/* roulang page: index */
:root {
            --brand-dark: #0F172A;
            --brand-carbon: #0B0F19;
            --brand-steel: #1E293B;
            --brand-light: #F8FAFC;
            --brand-slate: #F1F5F9;
            --brand-green: #10B981;
            --brand-orange: #F97316;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-color: #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;
            -webkit-font-smoothing: antialiased;
        }

        .hero-overlay {
            background: linear-gradient(105deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.85) 50%, rgba(15, 23, 42, 0.65) 100%);
        }

        .dark-mesh-bg {
            background-color: #0F172A;
            background-image: radial-gradient(rgba(30, 41, 59, 0.8) 1px, transparent 1px);
            background-size: 24px 24px;
        }

        .tech-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            padding: 0.25rem 0.75rem;
            font-size: 0.8125rem;
            font-weight: 600;
            border-radius: 9999px;
            background-color: rgba(16, 185, 129, 0.12);
            color: #059669;
            border: 1px solid rgba(16, 185, 129, 0.25);
        }

        .faq-item input:checked ~ .faq-content {
            max-height: 500px;
            opacity: 1;
            padding-top: 1rem;
            padding-bottom: 1.25rem;
        }

        .faq-item input:checked ~ label .faq-icon {
            transform: rotate(180deg);
            color: #F97316;
        }

        .faq-content {
            max-height: 0;
            opacity: 0;
            overflow: hidden;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: #10B981;
            box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
        }