:root {
            --primary: #4a6fa5;
            --primary-light: #6a8bc5;
            --accent: #ff7e5f;
            --error: #e74c3c;
            --success: #2ecc71;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f9fafc 0%, #e8ecf5 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        
        .login-container {
            width: 100%;
            max-width: 420px;
        }
        
        .login-card {
            background: white;
            border-radius: 16px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
            padding: 2.5rem;
            text-align: center;
        }
        
        .login-header {
            margin-bottom: 2rem;
        }
        
        .login-icon {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2.5rem;
        }
        
        .login-header h1 {
            color: var(--primary);
            font-size: 1.8rem;
            margin-bottom: 0.5rem;
        }
        
        .login-header p {
            color: #666;
            font-size: 0.95rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
            text-align: left;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            color: #555;
            font-weight: 600;
            font-size: 0.9rem;
        }
        
        .input-with-icon {
            position: relative;
        }
        
        .input-with-icon i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #999;
        }
        
        .form-control {
            width: 100%;
            padding: 14px 15px 14px 45px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s;
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
        }
        
        .btn {
            display: inline-block;
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 0.5rem;
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(74, 111, 165, 0.3);
        }
        
        .btn i {
            margin-right: 8px;
        }
        
        .alert {
            padding: 12px 15px;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            text-align: left;
            font-size: 0.9rem;
        }
        
        .alert-error {
            background-color: rgba(231, 76, 60, 0.1);
            color: var(--error);
            border-left: 4px solid var(--error);
        }
        
        .back-link {
            display: inline-block;
            margin-top: 1.5rem;
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .back-link:hover {
            color: var(--primary-light);
        }
        
        @media (max-width: 480px) {
            .login-card {
                padding: 2rem 1.5rem;
            }
            
            .login-header h1 {
                font-size: 1.5rem;
            }
        }