* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            color: #333;
        }
        
        .login-container {
            width: 90%;
            max-width: 450px;
            background: #fff;
            padding: 40px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
        }
        
        .login-container:hover {
            transform: translateY(-5px);
        }
        
        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        .login-header h1 {
            color: #2c7be5;
            margin: 0;
            font-size: 32px;
            font-weight: 600;
        }
        
        .login-header p {
            color: #666;
            margin-top: 10px;
            font-size: 16px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #444;
        }
        
        input[type="text"],
        input[type="password"] {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            border: 1px solid #ddd;
            border-radius: 8px;
            box-sizing: border-box;
            transition: border-color 0.3s, box-shadow 0.3s;
        }
        
        input[type="text"]:focus,
        input[type="password"]:focus {
            border-color: #2c7be5;
            box-shadow: 0 0 0 3px rgba(44, 123, 229, 0.2);
            outline: none;
        }
        
        button[type="submit"] {
            width: 100%;
            padding: 16px;
            font-size: 16px;
            font-weight: 600;
            background-color: #2c7be5;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            margin-top: 10px;
            transition: background-color 0.3s, transform 0.2s;
        }
        
        button[type="submit"]:hover {
            background-color: #1a68d1;
            transform: translateY(-2px);
        }
        
        button[type="submit"]:active {
            transform: translateY(0);
        }
        
        .error {
            color: #e74c3c;
            text-align: center;
            margin-bottom: 20px;
            font-weight: 600;
            padding: 12px;
            background-color: #fdeded;
            border-radius: 8px;
            border-left: 4px solid #e74c3c;
        }
        
        .login-note {
            text-align: center;
            margin-top: 20px;
            color: #666;
            font-size: 14px;
        }
        
        .demo-accounts {
            margin-top: 25px;
            padding: 15px;
            background-color: #f8f9fa;
            border-radius: 8px;
            font-size: 14px;
        }
        
        .demo-accounts h3 {
            margin-bottom: 10px;
            color: #2c7be5;
        }
        
        .demo-accounts p {
            margin: 5px 0;
            color: #666;
        }
        
        @media (max-width: 500px) {
            .login-container {
                padding: 25px;
            }
            
            .login-header h1 {
                font-size: 28px;
            }
        }