.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.calendar-header button {
    background: #0073aa;
    color: #fff;
    border: none;
    padding: 5px 10px;
    cursor: pointer;
}

.calendar-header button:hover {
    background: #005177;
}

.calendar-days, .calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.calendar-day-header, .calendar-cell {
    padding: 8px;
    background: #f1f1f1;
    text-align: center;
}

.calendar-cell {
    cursor: pointer;
}

.calendar-cell.selected {
    background: #0073aa;
    color: #fff;
}

.calendar-cell.empty {
    background: transparent;
    cursor: default;
}