/* roulang page: index */
:root {
            --brand-primary: #0F52BA;
            --brand-secondary: #00A896;
            --brand-accent: #FF9F1C;
            --bg-base: #FFFFFF;
            --bg-subtle: #F4F7FB;
            --bg-dark: #0A1128;
            --text-heading: #111827;
            --text-body: #374151;
            --text-muted: #6B7280;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-base);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }

        .code-window {
            background: #080E21;
            box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.12);
        }

        .custom-scrollbar::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background-color: rgba(15, 82, 186, 0.2);
            border-radius: 4px;
        }
        
        .tab-btn.active {
            color: #0F52BA;
            border-bottom: 2px solid #0F52BA;
            background-color: rgba(15, 82, 186, 0.04);
        }

        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.25s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.open {
            max-height: 380px;
            opacity: 1;
        }