body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            max-width: 500px;
            margin: 50px auto;
            padding: 20px;
            background-color: #f5f8fa;
            color: #333;
        }
        .login-form, .welcome-panel {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        h2 {
            color: #2c3e50;
            margin-bottom: 20px;
            text-align: center;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        input[type="text"], input[type="password"] {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 6px;
            box-sizing: border-box;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        input[type="text"]:focus, input[type="password"]:focus {
            border-color: #3498db;
            outline: none;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        button {
            background-color: #3498db;
            color: white;
            padding: 12px 20px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            width: 100%;
            font-size: 16px;
            font-weight: 600;
            transition: background-color 0.3s;
        }
        button:hover {
            background-color: #2980b9;
        }
        .logout-btn {
            background-color: #e74c3c;
        }
        .logout-btn:hover {
            background-color: #c0392b;
        }
        .error {
            color: #e74c3c;
            margin-bottom: 20px;
            padding: 10px;
            background-color: #fadbd8;
            border-radius: 6px;
            text-align: center;
        }
        .user-info {
            background-color: #eaf7ff;
            padding: 15px;
            border-radius: 6px;
            margin-bottom: 20px;
        }
        .user-info p {
            margin: 8px 0;
        }
        .info {
            font-size: 14px;
            color: #7f8c8d;
            text-align: center;
            margin-top: 20px;
        }
        .role-badge {
            display: inline-block;
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: bold;
            margin-left: 10px;
        }
        .role-user {
            background-color: #3498db;
            color: orange;
        }
        .role-manager {
            background-color: #9b59b6;
            color: green;
        }
        .explanation {
            background-color: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 15px;
            margin-top: 20px;
            border-radius: 6px;
            font-size: 14px;
        }