.calendar-container {
    background-color: white;
    border-radius: 1.5rem; /* 24px */
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calendar-header-btn {
    background-color: #f1f5f9; /* slate-100 */
    border-radius: 9999px;
    padding: 0.5rem;
    transition: background-color 0.2s ease;
}
.calendar-header-btn:hover {
    background-color: #e2e8f0; /* slate-200 */
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.calendar-day-header {
    text-align: center;
    font-weight: 600;
    color: #64748b; /* slate-500 */
    font-size: 0.875rem;
    padding: 0.75rem 0;
}

.calendar-day {
    padding: 0.5rem;
    min-height: 80px;
    border-top: 1px solid #f1f5f9;
    border-left: 1px solid #f1f5f9;
    transition: background-color 0.3s ease;
}

.calendar-day.other-month {
    background-color: #f8fafc; /* slate-50 */
}

.course-event {
    display: block;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    margin-top: 0.25rem;
    border-radius: 0.375rem;
    background-color: #e0e7ff; /* indigo-100 */
    color: #3730a3; /* indigo-800 */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background-color 0.2s;
}

.course-event:hover {
    background-color: #c7d2fe; /* indigo-200 */
    color: #312e81; /* indigo-900 */
}