.gbg-container {
    max-width: 1200px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.gbg-container .card {
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 20px;
}
.gbg-container .table th {
    background-color: #e9ecef;
}
.gbg-container .gpa-box {
    background-color: #28a745;
    color: white;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
}
.gbg-container .btn-export {
    margin-left: 10px;
}
.gbg-container .alert {
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}
.gbg-container .alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}
.gbg-container .alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeeba;
}
.gbg-container .alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}