:root {
            --primary-color: #3498db;
            --secondary-color: #2c3e50;
            --success-color: #2ecc71;
            --danger-color: #e74c3c;
            --light-bg: #f8f9fa;
        }
        
        body {
            background-color: #f5f5f5;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            height: 100vh;
            display: flex;
            align-items: center;
        }
        
        .login-card {
            width: 100%;
            max-width: 450px;
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }
        
        .card-header {
            background: linear-gradient(135deg, var(--secondary-color), #34495e);
            color: white;
            text-align: center;
            padding: 1.5rem;
            border-bottom: none;
        }
        
        .card-body {
            padding: 2rem;
        }
        
        .form-control {
            border-radius: 8px;
            padding: 12px 15px;
            border: 1px solid #ddd;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(52, 152, 219, 0.25);
        }
        
        .btn-login {
            background-color: var(--primary-color);
            border: none;
            padding: 12px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s;
        }
        
        .btn-login:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
        }
        
        .alert {
            border-radius: 8px;
        }
        
        .login-footer {
            text-align: center;
            margin-top: 1.5rem;
            color: #666;
        }
        
        .login-footer a {
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: none;
        }