/* roulang page: index */
:root {
            --bg-canvas: #F8F9FA;
            --bg-surface: #F1F3F5;
            --color-primary: #1E3A8A;
            --color-primary-hover: #172554;
            --color-accent-indigo: #4F46E5;
            --color-accent-teal: #0D9488;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-default: #E2E8F0;
            --shadow-subtle: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
            --shadow-hover: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
            --ease-out-cubic: cubic-bezier(0.16, 1, 0.3, 1);
        }

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

        .card-interactive {
            transition: all 0.3s var(--ease-out-cubic);
            box-shadow: var(--shadow-subtle);
        }
        .card-interactive:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #CBD5E1;
        }

        .hero-banner-mask {
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.85) 0%, rgba(15, 23, 42, 0.94) 100%);
        }

        .nav-backdrop {
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background-color: rgba(255, 255, 255, 0.92);
        }

        /* 滚动条美化 */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #F1F3F5;
        }
        ::-webkit-scrollbar-thumb {
            background: #CBD5E1;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #94A3B8;
        }

        .btn-press:active {
            transform: scale(0.98);
        }

        /* 手风琴平滑高度动画辅助 */
        details summary::-webkit-details-marker {
            display: none;
        }