body {
    font-family: 'Arial', sans-serif;
    background-color: #f8f9fa;
}

.container {
    max-width: 1140px;
}

.navbar-brand {
    font-weight: bold;
}

.table th, .table td {
    vertical-align: middle;
}

.btn-action {
    margin-right: 5px;
}

.form-control,
.custom-select {
    border-radius: 0.25rem;
}

.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.card-header {
    background-color: #e9ecef;
    border-bottom: 1px solid #dee2e6;
    font-weight: bold;
}

/* Timetable styles */
.timetable-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
}

.timetable-slot {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
    background-color: #fff;
}

.timetable-slot.busy {
    background-color: #ffcdd2; /* Light red for busy slots */
    color: #b71c1c;
}

.timetable-slot.free {
    background-color: #c8e6c9; /* Light green for free slots */
    color: #1b5e20;
}

.timetable-checkbox {
    margin-top: 5px;
}

/* Modern Search Form */
.search-form .form-group {
    margin-bottom: 1rem;
}

.search-form .btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

.search-form .btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

/* Results Table */
.results-table th {
    background-color: #f2f2f2;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .navbar-nav {
        flex-direction: column;
    }
    .nav-item {
        padding: 5px 0;
    }
}