:root {
            --primary-color: #4361ee;
            --primary-light: #4895ef;
            --secondary-color: #3f37c9;
            --accent-color: #f72585;
            --light-gray: #f8f9fa;
            --dark-gray: #212529;
            --white: #ffffff;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.2s ease;
        }/* 注册表单区域 */
        .register-main {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 2rem 1.5rem;
        }
        
        .register-container {
            width: 100%;
            max-width: 500px;
            background-color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
        }
        
        .register-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: var(--white);
            padding: 2rem;
            text-align: center;
        }
        
        .register-logo {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        
        .register-subtitle {
            font-size: 1rem;
            opacity: 0.9;
        }
        
        .register-form {
            padding: 2rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark-gray);
        }
        
        .form-input {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #dee2e6;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        
        .form-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
        }
        
        /* 验证码区域样式 */
        .captcha-group {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .captcha-input {
            flex: 1;
        }
        
        .captcha-image {
            width: 120px;
            height: 40px;
            border-radius: var(--border-radius);
            border: 1px solid #dee2e6;
            cursor: pointer;
            background-color: #f8f9fa;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: bold;
            letter-spacing: 2px;
            color: var(--dark-gray);
            user-select: none;
        }
        
        .password-strength {
            height: 4px;
            background-color: #e9ecef;
            border-radius: 2px;
            margin-top: 0.5rem;
            overflow: hidden;
        }
        
        .password-strength-bar {
            height: 100%;
            width: 0;
            background-color: #dc3545;
            transition: width 0.3s ease;
        }
        
        .password-strength.weak .password-strength-bar {
            width: 25%;
            background-color: #dc3545;
        }
        
        .password-strength.medium .password-strength-bar {
            width: 50%;
            background-color: #fd7e14;
        }
        
        .password-strength.strong .password-strength-bar {
            width: 75%;
            background-color: #28a745;
        }
        
        .password-strength.very-strong .password-strength-bar {
            width: 100%;
            background-color: #20c997;
        }
        
        .password-hint {
            font-size: 0.75rem;
            color: #6c757d;
            margin-top: 0.25rem;
        }
        
        .register-button {
            width: 100%;
            padding: 0.75rem;
            background-color: var(--primary-color);
            color: var(--white);
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .register-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        .register-footer {
            padding: 1.5rem 2rem;
            text-align: center;
            border-top: 1px solid #e9ecef;
        }
        
        .login-link {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
        }
        
        .login-link:hover {
            text-decoration: underline;
        }
        
        /* 页脚区域 */
        footer {
            background-color: var(--dark-gray);
            color: var(--white);
            padding: 3rem 0 1.5rem;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        
        .footer-section h3 {
            margin: 0 0 1rem 0;
            font-size: 1.125rem;
            font-weight: 600;
        }
        
        .footer-section p {
            color: #adb5bd;
            margin-bottom: 0.75rem;
            line-height: 1.6;
        }
        
        .footer-section a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
            display: block;
            margin-bottom: 0.5rem;
        }
        
        .footer-section a:hover {
            color: var(--white);
        }
        
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #495057;
            color: #adb5bd;
            font-size: 0.875rem;
        }
        
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                gap: 1rem;
            }
            
            .main-nav ul {
                gap: 1rem;
            }
            
            .register-header {
                padding: 1.5rem;
            }
            
            .register-form {
                padding: 1.5rem;
            }
        }