:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --math-color: #6f42c1;
            --calc-color: #e83e8c;
            --date-color: #2a9d8f;
        }
        .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 0.2);
            position: relative;
            overflow: hidden;  color: var(--text-color);
        }
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .breadcrumb-item.active {
            color: var(--text-color);
        }
        .date-result-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .date-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 1rem;
            transition: all 0.2s;
            box-shadow: 0 1px 3px rgba(0,0,0,0.03);
        }
        .date-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            border-color: var(--primary-color);
        }
        .date-main {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--date-color);
            margin-bottom: 0.25rem;
            word-break: break-word;
        }
        .date-details {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .date-details span {
            background: var(--light-gray);
            padding: 0.2rem 0.5rem;
            border-radius: 12px;
        }
        .copy-btn {
            background: none;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 0.2rem 0.5rem;
            font-size: 0.75rem;
            margin-top: 0.5rem;
            color: var(--text-muted);
        }
        .copy-btn:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .math-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--math-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .function-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-btn {
            background-color: rgba(42, 157, 143, 0.1);
            border: 1px solid rgba(42, 157, 143, 0.2);
            border-radius: 4px;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            color: var(--date-color);
            cursor: pointer;
            transition: all 0.2s;
        }
        .example-btn:hover {
            background-color: rgba(42, 157, 143, 0.2);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            }