:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #2ecc71;
            --warning: #f39c12;
            --text: #333;
            --text-light: #f9f9f9;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --border-radius: 12px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f5f7fa;
            color: var(--text);
            line-height: 1.6;
            opacity: 0;
            animation: fadeIn 0.5s ease forwards;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            background: linear-gradient(135deg, var(--light) 0%, var(--secondary) 100%);
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .login-container {
            width: 100%;
            max-width: 420px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: var(--transition);
        }

        /* .login-container:hover {
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
            transform: translateY(-5px);
        } */

        .login-header {
            background: var(--primary);
            color: var(--text-light);
            padding: 30px 20px;
            text-align: center;
        }

        .login-header h1 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .login-header p {
            font-size: 14px;
            opacity: 0.8;
        }

        .login-form {
            padding: 30px;
        }

        .form-group {
            margin-bottom: 20px;
            position: relative;
        }

        .form-group i {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary);
            font-size: 18px;
        }

        .form-group input {
            width: 100%;
            padding: 15px 15px 15px 45px;
            border: 2px solid #e1e5eb;
            border-radius: var(--border-radius);
            font-size: 16px;
            transition: var(--transition);
            outline: none;
        }

        .form-group input:focus {
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }

        .form-group input::placeholder {
            color: #a0aec0;
        }

        button {
            width: 100%;
            padding: 15px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
        }

        button:hover {
            background: var(--secondary);
        }

        button i {
            font-size: 18px;
        }

        .error-message {
            background: rgba(231, 76, 60, 0.1);
            color: var(--accent);
            padding: 12px;
            border-radius: var(--border-radius);
            margin-top: 20px;
            text-align: center;
            font-size: 14px;
            border-left: 4px solid var(--accent);
        }

        .login-footer {
            padding: 20px;
            text-align: center;
            font-size: 14px;
            color: #718096;
            border-top: 1px solid #e1e5eb;
        }

        @media (max-width: 480px) {
            .login-container {
                max-width: 100%;
            }
            
            .login-form {
                padding: 20px;
            }
        }

        .back-to-home {
            margin-top: 15px;
            text-align: center;
        }
        
        .back-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: #6c757d;
            color: white;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: 4px;
            font-weight: 500;
            transition: background-color 0.3s;
            border: none;
            cursor: pointer;
            font-size: 14px;
        }
        
        .back-button:hover {
            background-color: #5a6268;
            color: white;
            text-decoration: none;
        }
        
        .back-button i {
            margin-right: 8px;
        }
        
        .button-group {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }