/* roulang page: index */
:root {
            --primary-blue: #2563eb;
            --primary-hover: #1d4ed8;
            --accent-green: #10b981;
            --dark-navy: #0f172a;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --card-radius: 16px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            -webkit-font-smoothing: antialiased;
        }

        .hero-mesh-bg {
            background-color: #f8fafc;
            background-image: radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.08) 0px, transparent 50%),
                              radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.05) 0px, transparent 50%);
        }

        .dark-tech-pattern {
            background-color: #0f172a;
            background-image: radial-gradient(rgba(59, 130, 246, 0.15) 1px, transparent 0);
            background-size: 24px 24px;
        }

        .interactive-card {
            transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.25s ease;
        }
        .interactive-card:hover {
            transform: translateY(-4px);
        }

        /* 统一平滑折叠 */
        details summary::-webkit-details-marker {
            display: none;
        }