:root {
            --primary-color: #2a5298;
            --primary-light: #3a63b8;
            --primary-dark: #1e3c72;
            --secondary-color: #40c057;
            --warning-color: #fab005;
            --danger-color: #fa5252;
            --info-color: #339af0;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
            --border-color: #e0e6ed;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            position: relative;
            overflow-x: hidden;
        }
        
        /* 背景装饰元素 */
        .bg-shape {
            position: absolute;
            border-radius: 50%;
            z-index: -1;
        }
        
        .bg-shape-1 {
            width: 300px;
            height: 300px;
            background: linear-gradient(135deg, rgba(42, 82, 152, 0.1) 0%, rgba(42, 82, 152, 0.05) 100%);
            top: -150px;
            right: -150px;
        }
        
        .bg-shape-2 {
            width: 200px;
            height: 200px;
            background: linear-gradient(135deg, rgba(64, 192, 87, 0.1) 0%, rgba(64, 192, 87, 0.05) 100%);
            bottom: -100px;
            left: -100px;
        }
        
        .bg-shape-3 {
            width: 150px;
            height: 150px;
            background: linear-gradient(135deg, rgba(250, 176, 5, 0.1) 0%, rgba(250, 176, 5, 0.05) 100%);
            top: 50%;
            right: 10%;
        }
        
        /* 登录容器 */
        .login-container {
            display: flex;
            width: 1000px;
            min-height: 600px;
            background-color: white;
            border-radius: 20px;
            box-shadow: var(--shadow);
            overflow: hidden;
            margin: 20px;
        }
        
        /* 左侧区域 - 欢迎和信息 */
        .login-left {
            flex: 1;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            color: white;
            padding: 60px 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }
        
        .login-left::before {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            top: -100px;
            left: -100px;
        }
        
        .login-left::after {
            content: '';
            position: absolute;
            width: 150px;
            height: 150px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
            bottom: -75px;
            right: -75px;
        }
        
        .logo-area {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
        }
        
        .logo-icon {
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            font-size: 1.8rem;
        }
        
        .logo-text h1 {
            font-size: 1.8rem;
            margin-bottom: 5px;
        }
        
        .logo-text p {
            font-size: 0.9rem;
            opacity: 0.8;
        }
        
        .welcome-text {
            margin-bottom: 40px;
            position: relative;
            z-index: 1;
        }
        
        .welcome-text h2 {
            font-size: 2.2rem;
            margin-bottom: 15px;
            line-height: 1.3;
        }
        
        .welcome-text p {
            font-size: 1rem;
            opacity: 0.9;
            max-width: 400px;
        }
        
        .features-list {
            margin-top: 40px;
            position: relative;
            z-index: 1;
        }
        
        .feature-item {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
        }
        
        .feature-icon {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.15);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            font-size: 1.2rem;
        }
        
        .feature-text h4 {
            font-size: 1.1rem;
            margin-bottom: 5px;
        }
        
        .feature-text p {
            font-size: 0.9rem;
            opacity: 0.8;
        }
        
        .copyright {
            position: absolute;
            bottom: 30px;
            left: 40px;
            font-size: 0.85rem;
            opacity: 0.7;
            z-index: 1;
        }
        
        /* 右侧区域 - 登录表单 */
        .login-right {
            flex: 1;
            padding: 60px 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        
        .login-header {
            margin-bottom: 40px;
            text-align: center;
        }
        
        .login-header h2 {
            color: var(--primary-dark);
            font-size: 2rem;
            margin-bottom: 10px;
        }
        
        .login-header p {
            color: var(--gray-color);
            font-size: 1rem;
        }
        
        .login-form {
            width: 100%;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark-color);
        }
        
        .input-with-icon {
            position: relative;
        }
        
        .input-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-color);
            font-size: 1.1rem;
        }
        
        .form-control {
            width: 100%;
            padding: 15px 15px 15px 50px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            font-size: 1rem;
            transition: var(--transition);
            background-color: white;
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(42, 82, 152, 0.1);
        }
        
        .password-toggle {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-color);
            cursor: pointer;
            font-size: 1.1rem;
        }
        
        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
        }
        
        .checkbox-group {
            display: flex;
            align-items: center;
        }
        
        .checkbox-group input {
            margin-right: 8px;
            width: 18px;
            height: 18px;
        }
        
        .checkbox-group label {
            color: var(--dark-color);
            font-size: 0.95rem;
            cursor: pointer;
        }
        
        .forgot-password {
            color: var(--primary-color);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }
        
        .forgot-password:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        
        .btn {
            padding: 15px;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: var(--transition);
            font-size: 1rem;
            width: 100%;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(42, 82, 152, 0.3);
        }
        
        .divider {
            display: flex;
            align-items: center;
            margin: 30px 0;
            color: var(--gray-color);
        }
        
        .divider::before, .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background-color: var(--border-color);
        }
        
        .divider-text {
            padding: 0 15px;
            font-size: 0.9rem;
        }
        
        .social-login {
            display: flex;
            gap: 15px;
            margin-bottom: 30px;
        }
        
        .social-btn {
            flex: 1;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            background-color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            cursor: pointer;
            transition: var(--transition);
            color: var(--dark-color);
            font-weight: 500;
        }
        
        .social-btn:hover {
            background-color: #f8f9fa;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
        }
        
        .social-btn i {
            font-size: 1.2rem;
        }
        
        .social-btn.wechat i {
            color: #09bb07;
        }
        
        .social-btn.dingtalk i {
            color: #008CFF;
        }
        
        .register-link {
            text-align: center;
            margin-top: 20px;
            color: var(--gray-color);
            font-size: 0.95rem;
        }
        
        .register-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            margin-left: 5px;
        }
        
        .register-link a:hover {
            text-decoration: underline;
        }
        
        /* 错误提示 */
        .error-message {
            color: var(--danger-color);
            font-size: 0.9rem;
            margin-top: 5px;
            display: flex;
            align-items: center;
            gap: 5px;
            display: none;
        }
        
        /* 成功提示 */
        .success-message {
            background-color: #d4edda;
            color: #155724;
            padding: 15px;
            border-radius: 10px;
            border-left: 4px solid var(--secondary-color);
            margin-bottom: 20px;
            display: none;
            align-items: center;
            gap: 10px;
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .login-container {
                width: 90%;
                max-width: 800px;
            }
        }
        
        @media (max-width: 768px) {
            .login-container {
                flex-direction: column;
                min-height: auto;
            }
            
            .login-left, .login-right {
                padding: 40px 30px;
            }
            
            .login-left {
                padding-bottom: 60px;
            }
            
            .copyright {
                bottom: 20px;
                left: 30px;
            }
            
            .bg-shape-1, .bg-shape-2, .bg-shape-3 {
                display: none;
            }
        }
        
        @media (max-width: 480px) {
            .login-container {
                margin: 10px;
                border-radius: 15px;
            }
            
            .login-left, .login-right {
                padding: 30px 20px;
            }
            
            .social-login {
                flex-direction: column;
            }
            
            .welcome-text h2 {
                font-size: 1.8rem;
            }
            
            .login-header h2 {
                font-size: 1.7rem;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .login-left, .login-right {
            animation: fadeIn 0.8s ease forwards;
        }
        
        .login-right {
            animation-delay: 0.2s;
        }
        
        /* 加载动画 */
        .loading-spinner {
            display: none;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* 语言选择器 */
        .language-selector {
            position: absolute;
            top: 30px;
            right: 30px;
            z-index: 10;
        }
        
        .language-btn {
            background: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.3);
            color: white;
            padding: 8px 15px;
            border-radius: 6px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            transition: var(--transition);
        }
        
        .language-btn:hover {
            background: rgba(255, 255, 255, 0.25);
        }
        
        .language-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            background: white;
            border-radius: 6px;
            box-shadow: var(--shadow);
            margin-top: 5px;
            min-width: 120px;
            display: none;
            overflow: hidden;
        }
        
        .language-dropdown.show {
            display: block;
            animation: fadeIn 0.3s ease;
        }
        
        .language-option {
            padding: 10px 15px;
            color: var(--dark-color);
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .language-option:hover {
            background-color: #f8f9fa;
        }
        
        .language-option.active {
            color: var(--primary-color);
            font-weight: 600;
        }