:root {
            --primary-color: #2c7da0;
            --primary-light: #a9d6e5;
            --primary-dark: #01497c;
            --secondary-color: #6c757d;
            --success-color: #28a745;
            --danger-color: #dc3545;
            --warning-color: #ffc107;
            --info-color: #17a2b8;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --border-color: #dee2e6;
            --text-color: #212529;
            --text-muted: #6c757d;
            --white: #ffffff;
            --shadow: 0 2px 10px rgba(0,0,0,0.05);
            --shadow-hover: 0 5px 15px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
  
        .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 2rem 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);
        }
         
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .result-title {
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            font-size: 1.5rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--primary-light);
        }
 
        .electrolyte-sodium {
            --electrolyte-color: #007bff;
            --electrolyte-light: rgba(0, 123, 255, 0.1);
        }
        
        .electrolyte-potassium {
            --electrolyte-color: #28a745;
            --electrolyte-light: rgba(40, 167, 69, 0.1);
        }
        
        .electrolyte-calcium {
            --electrolyte-color: #fd7e14;
            --electrolyte-light: rgba(253, 126, 20, 0.1);
        }
        
        .electrolyte-magnesium {
            --electrolyte-color: #6f42c1;
            --electrolyte-light: rgba(111, 66, 193, 0.1);
        }
        
        .electrolyte-phosphate {
            --electrolyte-color: #e83e8c;
            --electrolyte-light: rgba(232, 62, 140, 0.1);
        }
        
        .electrolyte-chloride {
            --electrolyte-color: #20c997;
            --electrolyte-light: rgba(32, 201, 151, 0.1);
        }
        
        .electrolyte-bicarbonate {
            --electrolyte-color: #17a2b8;
            --electrolyte-light: rgba(23, 162, 184, 0.1);
        }
        
        /* 电解质卡片 */
        .electrolyte-card {
            border-radius: 10px;
            padding: 1.75rem;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        
        .electrolyte-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 6px;
            height: 100%;
            background-color: var(--electrolyte-color);
        }
        
        .electrolyte-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .electrolyte-header {
            display: flex;
            align-items: center;
            margin-bottom: 1.25rem;
        }
        
        .electrolyte-icon {
            width: 60px;
            height: 60px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1.25rem;
            font-size: 1.75rem;
            background-color: var(--electrolyte-light);
            color: var(--electrolyte-color);
        }
        
        .electrolyte-name {
            font-weight: 700;
            font-size: 1.4rem;
            margin-bottom: 0.25rem;
            color: var(--electrolyte-color);
        }
        
        .electrolyte-symbol {
            font-weight: 800;
            font-size: 1.6rem;
            margin-right: 0.5rem;
        }
        
        .electrolyte-value {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
            color: var(--text-color);
        }
        
        .electrolyte-range {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 0.5rem;
        }
        
        .electrolyte-note {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 0.75rem;
            padding-top: 0.75rem;
            border-top: 1px dashed var(--border-color);
        }
        
        /* 临床场景选择 */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.25rem;
            margin: 1.75rem 0;
        }
        
        .scenario-card {
            background: var(--white);
            border-radius: 10px;
            padding: 1.5rem;
            border: 2px solid var(--border-color);
            cursor: pointer;
            transition: var(--transition);
            height: 100%;
        }
        
        .scenario-card:hover {
            border-color: var(--primary-color);
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .scenario-card.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.05);
            box-shadow: 0 4px 12px rgba(44, 125, 160, 0.15);
        }
        
        .scenario-icon {
            width: 56px;
            height: 56px;
            border-radius: 10px;
            background-color: rgba(44, 125, 160, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.25rem;
            color: var(--primary-color);
            font-size: 1.5rem;
        }
        
        .scenario-title {
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--text-color);
            font-size: 1.2rem;
        }
        
        .scenario-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.5;
        }
        
        /* 结果摘要 */
        .electrolyte-summary {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1.25rem;
            margin: 1.75rem 0;
        }
        
        .summary-item {
            background: var(--white);
            border-radius: 10px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        
        .summary-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        
        .summary-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
            font-weight: 500;
        }
        
        .summary-number {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .summary-unit {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
  
        .electrolyte-chart-container {
            position: relative;
            height: 400px;
            width: 100%;
            margin: 2rem 0;
            background: var(--white);
            border-radius: 10px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
        }
        
   
        .infusion-calculator {
            background-color: rgba(44, 125, 160, 0.05);
            border-radius: 10px;
            padding: 2rem;
            margin: 2rem 0;
            border: 1px solid rgba(44, 125, 160, 0.2);
            box-shadow: var(--shadow);
        }
 
        .info-box {
            background-color: rgba(44, 125, 160, 0.05);
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
        }
        
        .warning-box {
            background-color: rgba(255, 193, 7, 0.1);
            border-left: 4px solid var(--warning-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
        }
        
        .danger-box {
            background-color: rgba(220, 53, 69, 0.1);
            border-left: 4px solid var(--danger-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
        }
          
        .step-content {
            flex: 1;
        }
        
  
        .reference-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            box-shadow: var(--shadow);
            border-radius: 8px;
            overflow: hidden;
        }
        
        .reference-table th, .reference-table td {
            padding: 1rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        
        .reference-table th {
            background-color: var(--primary-light);
            font-weight: 700;
            color: var(--primary-dark);
        }
        
        .reference-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .reference-table tr:hover {
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        /* 标题样式 */
        .section-title {
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--primary-light);
            font-size: 1.5rem;
        }
        
        .subsection-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-dark);
            font-size: 1.25rem;
        } 
        @media (max-width: 992px) {
     
            .scenario-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }
            
            .electrolyte-summary {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .tool-card {
                padding: 1.5rem;
            }
            
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            
            .electrolyte-summary {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .electrolyte-chart-container {
                height: 300px;
            }
        }
        
        @media (max-width: 576px) {
            .electrolyte-summary {
                grid-template-columns: 1fr;
            }
            
            .page-header {
                padding: 1.5rem 0;
            }
        }
         
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: var(--light-color);
        }
        
        ::-webkit-scrollbar-thumb {
            background: var(--primary-light);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary-color);
        }
   
        @media print {
            .navbar, .footer, .ad-container, .action-btn, .btn {
                display: none !important;
            }
            
            .tool-card, .result-container {
                box-shadow: none;
                border: 1px solid #000;
            }
            
            .page-header {
                background: none;
                border-bottom: 2px solid #000;
            }
        }