/* roulang page: index */
:root {
            --primary: #FF6A00;
            --primary-dark: #EA580C;
            --primary-light: #FFF7ED;
            --secondary: #1E293B;
            --secondary-deep: #0F172A;
            --accent: #10B981;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --radius-main: 1rem;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-light);
            line-height: 1.75;
            overflow-x: hidden;
        }
        .text-main-title { color: var(--text-main); }
        .bg-pattern-dark {
            background-color: var(--secondary-deep);
            background-image: radial-gradient(#334155 1px, transparent 1px);
            background-size: 24px 24px;
        }
        .card-hover-effect {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover-effect:hover {
            transform: translateY(-4px);
            box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.08);
        }
        .faq-toggle:checked ~ .faq-content {
            max-height: 240px;
            opacity: 1;
            padding-top: 1rem;
        }
        .faq-toggle:checked ~ label .faq-icon {
            transform: rotate(180deg);
        }