:root {
            --primary-color: #3498db;
            --secondary-color: #2ecc71;
            --background: #f8f9fa;
            --card-bg: #ffffff;
            --danger-color: #e74c3c;
            --warning-color: #f39c12;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: var(--background);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }
        
        .register-container {
            background: var(--card-bg);
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 450px;
        }
        
        .register-header {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .register-header h1 {
            color: #2b2d42;
            font-size: 1.8rem;
            margin-bottom: 0.5rem;
        }
        
        .register-header p {
            color: #666;
        }
        
        .form-group {
            margin-bottom: 1.2rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            color: #444;
            font-weight: 500;
        }
        
        .form-group input {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        
        .form-group input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        
        .btn {
            width: 100%;
            padding: 1rem;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 1rem;
            font-weight: 500;
        }
        
        .btn:hover {
            background: #2980b9;
            box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
        }
        
        .btn:disabled {
            background: #ccc;
            cursor: not-allowed;
            box-shadow: none;
        }
        
        .register-footer {
            text-align: center;
            margin-top: 1.5rem;
            color: #666;
            font-size: 0.95rem;
        }
        
        .register-footer a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .register-footer a:hover {
            color: #2980b9;
            text-decoration: underline;
        }
        
        /* 消息提示框：区分成功、错误、待审核 */
        .message-box {
            padding: 0.8rem;
            border-radius: 6px;
            margin-bottom: 1rem;
            display: none;
            border-left: 4px solid;
            font-size: 0.95rem;
            align-items: center;
            gap: 0.5rem;
        }
        
        .error-message {
            background: #ffebee;
            color: #d32f2f;
            border-left-color: var(--danger-color);
        }
        
        .success-message {
            background: #e8f5e9;
            color: #2e7d32;
            border-left-color: var(--secondary-color);
        }
        
        .pending-message {
            background: #fff3cd;
            color: #856404;
            border-left-color: var(--warning-color);
        }
        
        .terms {
            display: flex;
            align-items: center;
            margin-top: 1rem;
            font-size: 0.9rem;
        }
        
        .terms input {
            margin-right: 8px;
            width: auto; /* 修复复选框宽度问题 */
        }
        
        .terms label {
            margin-bottom: 0;
            color: #666;
        }
        
        .terms a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .loading {
            display: none;
            text-align: center;
            padding: 1rem;
        }
        
        .spinner {
            border: 3px solid #f3f3f3;
            border-top: 3px solid var(--primary-color);
            border-radius: 50%;
            width: 24px;
            height: 24px;
            animation: spin 1s linear infinite;
            margin: 0 auto 0.5rem;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        @media (max-width: 480px) {
            .register-container {
                padding: 1.5rem;
            }
            
            .register-header h1 {
                font-size: 1.6rem;
            }
        }