/* roulang page: index */
:root {
            --primary: #4f46e5;
            --primary-hover: #4338ca;
            --accent-green: #10b981;
            --accent-amber: #f59e0b;
            --dark-surface: #0f172a;
            --bg-light: #f8fafc;
            --border-color: #e2e8f0;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
        }

        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-body);
            background-color: var(--bg-light);
            line-height: 1.7;
        }

        .hero-bg-overlay {
            background-image: linear-gradient(to right, rgba(15, 23, 42, 0.92) 0%, rgba(30, 41, 59, 0.85) 100%), url('/assets/images/ea506bdf3d5426d6.png');
            background-size: cover;
            background-position: center;
        }

        .dark-section-bg {
            background-image: radial-gradient(circle at 50% 50%, #1e1b4b 0%, #0f172a 100%);
        }

        /* 统一平滑阴影与动效 */
        .card-soft-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-soft-shadow:hover {
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
            transform: translateY(-4px);
        }

        /* 手风琴去掉默认三角形 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }