/* roulang page: index */
:root {
            --color-bg-dark: #0B0F17;
            --color-card-dark: #111827;
            --color-radar: #10B981;
            --color-amber: #F59E0B;
            --text-main: #0F172A;
            --text-muted: #475569;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #0B0F17;
            color: #E2E8F0;
            line-height: 1.75;
        }
        .text-balance {
            text-wrap: balance;
        }
        .custom-glass {
            background: rgba(17, 24, 39, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(31, 41, 55, 0.8);
        }
        .hero-bg {
            background-image: linear-gradient(to bottom, rgba(11, 15, 23, 0.88), rgba(11, 15, 23, 0.96)), url('/assets/images/3c857b2b8347bdc2.png');
            background-size: cover;
            background-position: center;
        }
        .deep-concept-bg {
            background-image: linear-gradient(to bottom, rgba(11, 15, 23, 0.92), rgba(11, 15, 23, 0.92)), url('/assets/images/aa52ae99521fecdb.webp');
            background-size: cover;
            background-position: center;
        }
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }