:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #2ecc71;
            --error: #e74c3c;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }
        
        .container {
            display: flex;
            width: 100%;
            max-width: 1000px;
            height: 600px;
            box-shadow: var(--shadow);
            border-radius: 10px;
            overflow: hidden;
        }
        
        .sidebar {
            flex: 1;
            background-color: var(--primary);
            color: white;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        
        .content {
            flex: 1;
            background-color: white;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        
        h1 {
            font-size: 2rem;
            margin-bottom: 10px;
            color: var(--primary);
        }
        
        h3 {
            font-size: 1.6rem;
            margin-bottom: 20px;
            color: white;
        }
        
        p {
            margin-bottom: 20px;
            line-height: 1.6;
            color: rgba(255, 255, 255, 0.8);
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            margin-bottom: 30px;
            color: white;
            display: flex;
            align-items: center;
        }
        
        .logo-icon img {
            width: 50px;
            margin-right: 10px;
            font-size: 28px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--dark);
        }
        
        input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        input:focus {
            border-color: var(--secondary);
            outline: none;
        }
        
        .btn {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 4px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s;
            width: 100%;
            margin-top: 10px;
        }
        
        .btn:hover {
            background-color: #2980b9;
        }
        
        .forgot-password {
            text-align: right;
            margin-top: 10px;
        }
        
        .forgot-password a {
            color: var(--secondary);
            text-decoration: none;
            font-size: 14px;
        }
        
        .forgot-password a:hover {
            text-decoration: underline;
        }
        
        .error-message {
            color: var(--error);
            font-size: 14px;
            margin-top: 20px;
            display: none;
        }
        
        .return-icon {
            position: absolute;
            top: 20px;
            left: 20px;
            font-size: 24px;
            cursor: pointer;
            color: var(--primary);
        }
        .password-container {
            position: relative;
            display: flex;
            align-items: center;
        }
        
        .password-container input {
            width: 100%;
        }
        
        .password-toggle {
            position: absolute;
            right: 10px;
            cursor: pointer;
        }
        
        @media (max-width: 768px) {
            .container {
                flex-direction: column;
                height: auto;
            }
            .sidebar {
                padding: 30px;
            }
            .content {
                padding: 30px;
            }
        }