body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f8f9fa;
        }
        .container {
            background-color: #ffffff;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            padding: 30px;
            margin-bottom: 20px;
        }
        h1 {
            color: #2c3e50;
            text-align: center;
            margin-bottom: 10px;
        }
        h2 {
            color: #2c3e50;
            border-bottom: 2px solid #3498db;
            padding-bottom: 10px;
            margin-top: 30px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
            color: #2c3e50;
        }
        select, input {
            width: 100%;
            padding: 10px;
            border: 2px solid #e1e8ed;
            border-radius: 6px;
            font-size: 16px;
            box-sizing: border-box;
        }
        select:focus, input:focus {
            outline: none;
            border-color: #3498db;
        }
        button {
            background-color: #3498db;
            color: white;
            padding: 12px 24px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            margin: 5px;
            transition: background-color 0.3s;
        }
        button:hover {
            background-color: #2980b9;
        }
        .btn-secondary {
            background-color: #95a5a6;
        }
        .btn-secondary:hover {
            background-color: #7f8c8d;
        }
        .btn-success {
            background-color: #2ecc71;
        }
        .btn-success:hover {
            background-color: #27ae60;
        }
        .result {
            background-color: #e9f7ef;
            border: 1px solid #c3e6cb;
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
            text-align: center;
        }
        .gpa-display {
            font-size: 2.5em;
            font-weight: bold;
            color: #155724;
            margin: 10px 0;
        }
        .grade-scale {
            background-color: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            padding: 15px;
            margin: 15px 0;
        }
        .grade-scale h3 {
            margin-top: 0;
            color: #2c3e50;
        }
        .grade-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }
        .grade-table th, .grade-table td {
            border: 1px solid #dee2e6;
            padding: 8px;
            text-align: center;
        }
        .grade-table th {
            background-color: #e9ecef;
            font-weight: bold;
        }
        .course-row {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr auto;
            gap: 10px;
            align-items: center;
            margin-bottom: 10px;
            padding: 10px;
            background-color: #f8f9fa;
            border-radius: 6px;
        }
        .remove-btn {
            background-color: #e74c3c;
            color: white;
            border: none;
            border-radius: 4px;
            padding: 5px 10px;
            cursor: pointer;
            font-size: 14px;
        }
        .remove-btn:hover {
            background-color: #c0392b;
        }
        .info-box {
            background-color: #d1ecf1;
            border: 1px solid #bee5eb;
            border-radius: 8px;
            padding: 15px;
            margin: 15px 0;
        }
        .info-box h3 {
            margin-top: 0;
            color: #0c5460;
        }
        @media (max-width: 768px) {
            .course-row {
                grid-template-columns: 1fr;
                gap: 5px;
            }
            .gpa-display {
                font-size: 2em;
            }
        }