/* roulang page: index */
:root {
            --primary: #0F52BA;
            --primary-hover: #1e40af;
            --accent: #0284c7;
            --bg-base: #F8FAFC;
            --bg-alt: #F1F5F9;
            --text-dark: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: rgba(226, 232, 240, 0.85);
            --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            --card-shadow-hover: 0 20px 25px -5px rgba(15, 82, 186, 0.12), 0 10px 10px -5px rgba(15, 82, 186, 0.04);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-body);
            overflow-x: hidden;
        }

        .custom-card-shadow {
            box-shadow: var(--card-shadow);
            transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .custom-card-shadow:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-4px);
        }

        .code-preview-scroll::-webkit-scrollbar {
            height: 4px;
        }
        .code-preview-scroll::-webkit-scrollbar-thumb {
            background: #334155;
            border-radius: 2px;
        }

        .faq-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-item.active .faq-content {
            max-height: 240px;
            opacity: 1;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
        }