body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}
.header {
    background-color: #2c3e50;
    color: white;
    padding: 15px 0;
    border-bottom: 4px solid #3498db;
}
.app-title {
    font-weight: 600;
    font-size: 1.5rem;
}
.main-menu {
    background-color: #34495e;
    padding: 0;
}
.main-menu .nav-link {
    color: #ecf0f1;
    padding: 12px 20px;
    border-radius: 0;
    transition: all 0.3s;
}
.main-menu .nav-link:hover, 
.main-menu .nav-link.active {
    background-color: #3498db;
    color: white;
}
.content-area {
    padding: 25px;
    background-color: white;
    min-height: 500px;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-top: 20px;
}
.action-buttons {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #dee2e6;
}
.action-buttons .btn {
    margin-right: 8px;
    margin-bottom: 5px;
}
.data-table {
    margin-top: 20px;
}
.schedule-header {
    background-color: #e9ecef;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    font-weight: bold;
}
.day-column {
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 15px;
    height: 400px;
}
.day-title {
    font-weight: bold;
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 8px;
    margin-bottom: 15px;
}
.footer {
    margin-top: 30px;
    padding: 15px 0;
    color: #7f8c8d;
    font-size: 0.9rem;
    border-top: 1px solid #dee2e6;
}

.sortable {
    cursor: pointer;
    user-select: none;
    position: relative;
    transition: background-color 0.2s;
}

.sortable:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

.sortable i {
    font-size: 0.9em;
    transition: transform 0.3s ease;
}

.sortable.active {
    background-color: rgba(52, 152, 219, 0.2);
}