/* roulang page: index */
:root {
            --primary: #1d4ed8;
            --primary-hover: #1e40af;
            --accent: #f59e0b;
            --text-main: #0f172a;
            --text-muted: #475569;
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --border-color: #e2e8f0;
        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: var(--text-main); }
        .hero-bg {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 58, 138, 0.82) 100%), url('/assets/images/bb43880f0bd47dab.png') center/cover no-repeat;
        }
        .deep-block {
            background: linear-gradient(135deg, #090e17 0%, #0f172a 100%);
        }
        details summary::-webkit-details-marker { display: none; }