/* roulang page: index */
:root {
            --primary-blue: #1D4ED8;
            --interactive-blue: #2563EB;
            --sky-blue: #0284C7;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-color: #E2E8F0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        .custom-scrollbar::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background-color: #cbd5e1;
            border-radius: 4px;
        }

        /* Interactive Accordion Marker Reset */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }

        /* Subtle grid background pattern */
        .bg-grid-pattern {
            background-image: radial-gradient(rgba(37, 99, 235, 0.08) 1px, transparent 1px);
            background-size: 24px 24px;
        }