Okay, let's see how to adjust the HTML and CSS according to the user's requirements.

First, the user wants the divs with line_1 and line_3 to each take up an entire line, with their input elements as wide as possible. Also, the select element with podcast_id should be on its own line and full width. Wait, wait—the select in the original code has id="builtin_id", but the user mentioned the select with "podcast_id". Maybe that's a mistake. Let me check the original code again. Oh, right, the first input has id="podcast_id", but the select is "builtin_id". Hmm, maybe the user got the IDs mixed up. But I'll proceed with what's given, unless there's a typo.

Wait, the first requirement says the select with "podcast_id" should occupy a line. But in the code, the select has id="builtin_id". That might be an error. Maybe the user intended the select to have id="podcast_id"? Or perhaps they confused the input and select elements. Let me double-check the original code. The first div (line_1) has an input with id="podcast_id", and then there's a select with id="builtin_id". The user's second requirement is about the select with "podcast_id", which doesn't exist. So maybe that's a mistake. Perhaps the user meant the select element should be the one taking the full line. But in the original code, the select is outside any div. So perhaps the user wants that select to be in its own line, but maybe they intended to have another select with id="podcast_id"? Or maybe it's a typo, and the select's id should be "podcast_id". Alternatively, maybe the user made a mistake in the requirement, referring to the existing select. This is a bit confusing. Let me proceed with the given code and see.

Looking at the original code, the structure is:

- line_1 div with a label and input for podcast_id.

- Then a select element with id="builtin_id".

- Then line_3 div with label, input, buttons.

The user's second requirement is that the select with id="podcast_id" should occupy an entire line. But in the current code, there's no such select; the select has id="builtin_id". So perhaps the user made a mistake here. Maybe the select should have id="podcast_id", or perhaps the requirement is referring to the existing select. Alternatively, maybe the user intended the input in line_1 to be a select. This is unclear. But given the code provided, I'll have to make an assumption. Let's proceed with the existing elements.

Wait, the user's first requirement says the div with line_1 has an input that should be as wide as possible. The second requirement is about the select with podcast_id being full width. But in the code, the select is "builtin_id". So perhaps the user intended to have a select element with id="podcast_id" that's in its own line. But in the current code, the input in line_1 has id="podcast_id". That might be the confusion. Maybe the user swapped the IDs. Let's check:

In the original code:

<div id="line_1">

<label for="podcast_id">Podcast Search Term</label>

<input type="text" id="podcast_id" name="podcast_id">

</div>

Then the select is:

<select id="builtin_id" onchange="chain_action()">

...

</select>

So the input in line_1 has id="podcast_id", and the select has id="builtin_id". The user's second requirement refers to a select with id="podcast_id", which doesn't exist. That's a problem. So perhaps the user made a typo, and the select's id should be "podcast_id" instead of "builtin_id". Alternatively, maybe the user intended to refer to the input in line_1, but that's an input, not a select. Hmm. This is a bit of a problem. Let's try to clarify.

Assuming that the user made a mistake in the requirement, and the select that should be full width is the one with id="builtin_id", then we can proceed. Alternatively, perhaps the user intended the input in line_1 to be a select. But the code shows an input type="text". So this is confusing. Alternatively, maybe the user intended to have another select element with id="podcast_id" that's missing. But given the provided code, I'll have to work with what's there.

Alternatively, perhaps the user's second requirement is referring to the existing select, but the ID is wrong. Maybe they meant "builtin_id". Let's proceed under that assumption. So, adjusting the select with id="builtin_id" to take the full line and width.

Moving on. The user wants all three lines (line_1, the select, line_3) to be spaced vertically. So, perhaps using flexbox or block elements with margins.

For each of the main elements (line_1 div, the select, line_3 div), we can make them block elements and set their width to 100%, then apply some margin-bottom to space them vertically.

For the inputs and select to be as wide as possible, we can set their width to 100%, but they need to be within their parent containers which are block elements.

Also, the line_1 and line_3 divs are just for marking lines and should not use their IDs for styling. So, perhaps we can target their child elements directly.

But the user says not to use the line_1 and line_3 ids for styling. So, perhaps wrap each of the three main elements (the line_1 div, the select, the line_3 div) in a container div with a class, and apply styles to those.

Alternatively, we can structure the HTML so that each of the three main elements are direct children of a container, and apply styles to them.

Let's restructure the HTML:

Wrap everything in a container div with a class, say "container", and then each of the three main elements (line_1, select, line_3) are direct children. Then, apply styles to those children to be block elements with 100% width and some margin.

But in the original code, the select is not wrapped in a div. So, to satisfy requirement 2, the select itself should occupy an entire line. So, we can make the select a block element with width 100%.

So, the CSS would be:

.container > * {

margin-bottom: 1rem; /* spacing between lines */

}

.line {

display: block;

width: 100%;

}

input, select {

width: 100%;

box-sizing: border-box;

}

But line_1 and line_3 are divs, which are block elements by default. So maybe setting their width to 100% is redundant. However, their child inputs need to be 100% width.

Wait, the line_1 div is a block element, so it takes the full width. Inside it, the input should be as wide as possible. So, setting the input's width to 100% would make it take the full width of its parent, which is the line_1 div, which is a block element.

Similarly for the select: if we set its display to block and width 100%, it will take the full width.

For line_3, the same applies: the div is block, and the input inside should be 100% width.

So, the CSS steps:

1. Ensure that each main element (line_1 div, select, line_3 div) are block elements and take full width. Since they are divs and select is a replaced element, but by default, divs are block, select is inline. So for the select, set display: block; width: 100%.

2. The inputs inside line_1 and line_3 should have width: 100%.

3. The buttons in line_3 need to be arranged next to each other. The "More" button in the original code has nested buttons, which is invalid HTML. You can't have a button inside another button. So that needs to be fixed. The user mentioned that the "More" button is next to the "Run" button, but the current code has the More button containing other buttons. That's incorrect. So perhaps the More button should be a container, but buttons can't nest other buttons. So maybe the More functionality is intended to be a dropdown menu or a group of buttons that appear when More is clicked. But the user hasn't implemented that yet. So for now, the structure is invalid. We need to fix the HTML structure.

So, in the line_3 div, the buttons are structured as:

<button onclick="run_it()">Run</button>

<button>More

<button onclick="addPodcast()">Add</button>

<button onclick="removePodcast()">Remove</button>

... etc ...

</button>

This is invalid because buttons can't contain other buttons. So the inner buttons need to be moved outside. Perhaps the More button should trigger a dropdown or a menu that shows those additional buttons. But since the user hasn't figured that out yet, maybe we can adjust the structure to have the More button alongside the other buttons, but perhaps hide them initially, or structure them in a separate container.

But for the purpose of adjusting the layout, the invalid HTML needs to be fixed. So the nested buttons should be removed. Instead, maybe the More button is part of a group, and the other buttons are siblings, perhaps hidden or in a separate container.

But the user's note says that the More button is next to the Run button but they haven't implemented how to create more buttons yet. So perhaps the intended structure is to have the Run button and the More button next to each other, and when More is clicked, additional buttons appear. But for now, the code has the More button containing other buttons, which is invalid.

So, to fix the HTML, the inner buttons should be moved out of the More button. Maybe the More button is part of a group, and the other buttons are in a hidden div that becomes visible when More is clicked. For now, since the user hasn't implemented that, perhaps we can place the additional buttons in a container that's hidden, or just remove them for now. But the user's code includes them nested inside the More button, which is incorrect.

So, adjusting the HTML structure for line_3:

Remove the nested buttons inside the More button. Instead, perhaps the More button is a standalone button, and the other buttons are in a separate div that's toggled via JavaScript. But since the user hasn't implemented that yet, maybe just leave the More button as is, and the other buttons as siblings, but commented out or something. But the user's code has them nested, which is invalid. So this needs to be fixed.

So, changing the line_3 section to:

<div id="line_3">

<label for="cors_proxy">CORS Proxy</label>

<input type="text" id="cors_proxy" name="cors_proxy" value="https://cors-anywhere.herokuapp.com/">

<!-- Run button to fetch podcasts -->

<button onclick="run_it()">Run</button>

<button onclick="toggleMoreButtons()">More</button>

<div class="more-buttons" style="display: none;">

<button onclick="addPodcast()">Add</button>

<button onclick="removePodcast()">Remove</button>

<button onclick="savePodcastsToStorage()">Save to Storage</button>

<button onclick="loadPodcastsFromStorage()">Load from Storage</button>

<button onclick="savePodcastsToFile()">Export to File</button>

<button onclick="importPodcastsFromFile()">Import from File</button>

<input type="file" id="fileInput" style="display: none;" onchange="handleFileImport()" accept=".json">

</div>

</div>

Then, the JavaScript function toggleMoreButtons() would show/hide the more-buttons div. But that's beyond the current scope of CSS/HTML adjustment. However, for the HTML structure to be valid, this is necessary.

But the user hasn't implemented that yet, so maybe just structure the More button as a standalone button, and the other buttons as separate elements, but perhaps hidden or in a different container.

But given that the user's current code has invalid HTML, we need to correct that. So in the adjusted code, the More button shouldn't have nested buttons. Instead, the other buttons should be siblings or in a separate container.

So, the line_3 div's buttons should be structured as:

<button onclick="run_it()">Run</button>

<button>More</button>

<!-- Other buttons here, perhaps in a hidden div -->

But the user's code includes the other buttons inside the More button, which is invalid. So correcting that.

Now, moving on to the CSS.

To make each line take the full width and space vertically:

1. The container (maybe a parent div) should have each child (line_1, select, line_3) as block elements with margin-bottom for spacing.

But in the original code, there's no container. So perhaps wrap all three elements in a container div with a class, say "form-container", and apply styles to that.

But let's proceed.

For each of the three main elements (line_1 div, select, line_3 div), we need to make sure they are block elements and have some margin between them.

The line_1 and line_3 divs are already block elements. The select is inline by default, so we need to set it to display: block; width: 100%;.

Then, apply margin-bottom to each of these elements to space them vertically.

So, CSS:

#line_1, #line_3, select#builtin_id {

margin-bottom: 1rem;

}

But using IDs is discouraged for styling, but the user mentioned that line_1 and line_3 are only for marking lines and shouldn't be used for styling. So perhaps target the elements differently.

Alternatively, assign a common class to each line, like "form-line", and apply styles to that class.

But given the user's note, maybe avoid using the line_1 and line_3 IDs for styling. So, perhaps target the elements by their type and position.

Alternatively, structure the HTML so that each line is a div with a class, like:

<div class="form-line">

... line_1 content ...

</div>

<div class="form-line">

<select ...>

</div>

<div class="form-line">

... line_3 content ...

</div>

Then, apply styles to .form-line.

But the user's existing code uses line_1 and line_3 as IDs, but says not to use them for styling. So perhaps wrap each of the three main elements in a div with a class, e.g., "form-line", and style that.

But given the user's code, perhaps the best approach is to adjust the HTML structure to meet the requirements without relying on the line IDs.

Alternatively, since the user says not to use line_1 and line_3 for styling, we can target the elements directly.

So, for the first line (line_1), it's a div containing a label and input. To make the input as wide as possible, set the input's width to 100%.

Similarly for line_3's input.

The select element needs to be display: block and width: 100%.

Then, to space the three lines vertically, apply margin-bottom to each of the main elements.

Putting it all together:

CSS:

/* Make the select element take full width */

select#builtin_id {

display: block;

width: 100%;

margin-bottom: 1rem; /* Add spacing */

}

/* Make inputs inside line_1 and line_3 take full width */

#line_1 input,

#line_3 input {

width: 100%;

box-sizing: border-box;

}

/* Add spacing between the lines */

#line_1,

select#builtin_id,

#line_3 {

margin-bottom: 1rem;

}

/* Style for the buttons in line_3 */

#line_3 button {

margin-right: 0.5rem; /* Space between buttons */

}

However, the user's note says not to use line_1 and line_3 IDs for styling. So, to avoid using those IDs, perhaps target the elements by their parent-child relationships.

Alternatively, use a container and apply styles to its children.

For example:

<div class="form-container">

<div id="line_1">

...

</div>

<select ...>

</select>

<div id="line_3">

...

</div>

</div>

Then CSS:

.form-container > * {

margin-bottom: 1rem;

}

.form-container input,

.form-container select {

width: 100%;

box-sizing: border-box;

}

This way, all direct children of .form-container (which are line_1 div, select, line_3 div) get a margin-bottom for spacing. The inputs and selects inside are set to 100% width.

But the labels are inline elements, so they will be above the inputs if we set the inputs to block. Wait, in the current structure, the label and input are siblings. So to have the input take full width, but the label above it, we need to structure each line as a block, with the label and input each taking their own line.

For example, in line_1:

<div id="line_1">

<label for="podcast_id">Podcast Search Term</label>

<input type="text" id="podcast_id" name="podcast_id">

</div>

If we set the input to display: block; width: 100%, it will take the full width, and the label will be above it.

Similarly for the select: display: block; width: 100%.

So, adjusting the CSS:

.form-container input,

.form-container select {

display: block;

width: 100%;

box-sizing: border-box;

}

.form-container label {

display: block;

margin-bottom: 0.5rem; /* Space between label and input */

}

This way, labels are blocks above their respective inputs/selects.

For the buttons in line_3, they should be next to each other. Since buttons are inline-block by default, but if the parent is a block element, we can just let them flow inline. However, the input in line_3 (cors_proxy) should be full width, and the buttons come after.

So, the line_3 structure:

<label for="cors_proxy">CORS Proxy</label>

<input type="text" id="cors_proxy" name="cors_proxy" ...>

<button>Run</button>

<button>More</button>

<div class="more-buttons">...</div>

The label and input are blocks, taking full width. The buttons are inline. So, to arrange the buttons next to each other, we can set them to display: inline-block, but they are inline by default. However, the input is a block element, so the buttons will start on a new line after the input.

Wait, the input is a block element (due to the CSS), so it will take the entire line. Then the buttons will be next to each other on the next line.

But the user wants line_3 to occupy an entire line, but the buttons are next to each other. However, the entire line includes the input and the buttons. So, perhaps line_3's content is:

- label (block)

- input (block, full width)

- buttons (inline)

So the buttons will be on the same line as each other, but after the input.

But the user's requirement is that line_3 occupies one entire line and its embedded input is as wide as possible. Wait, the input should be as wide as possible, so it takes the full line. The buttons are next to the Run button. So, the input is full width, then the Run and More buttons are on the same line after the input.

But in the current structure, the input is a block element, so it takes the full width, and the buttons are inline elements that follow, so they would be on the next line. But the user wants the buttons to be next to the Run button. Wait, no—the user's third requirement says: "The 'More' button which is next to the 'Run' button..." So the Run and More buttons should be next to each other, but where? After the input.

So, the structure in line_3 should be:

label (block)

input (block, full width)

div containing Run and More buttons (inline-block)

So, wrap the buttons in a div and style them to display inline.

Alternatively, since the input is block, the buttons will appear after it. To have them on the same line as each other, they can be inline or inline-block.

But in the CSS, if we don't set them to block, they will be inline by default. So the Run and More buttons will be next to each other after the input.

But perhaps there's a better way to arrange them.

Alternatively, use flexbox on the line_3 div to arrange the label, input, and button container.

But the user wants the input in line_3 to be as wide as possible, so perhaps the input takes full width, and the buttons are below it, aligned to the left.

So, the line_3 div's structure would be:

<label>...</label>

<input ...>

<div class="button-group">

<button>Run</button>

<button>More</button>

</div>

Then, the button-group can have display: flex; gap: 0.5rem; to arrange the buttons next to each other.

Putting this together.

So, adjusting the line_3 HTML:

<div id="line_3">

<label for="cors_proxy">CORS Proxy</label>

<input type="text" id="cors_proxy" name="cors_proxy" value="https://cors-anywhere.herokuapp.com/">

<div class="button-group">

<button onclick="run_it()">Run</button>

<button onclick="toggleMore()">More</button>

</div>

<!-- More buttons container (hidden by default) -->

<div class="more-buttons" style="display: none;">

<button onclick="addPodcast()">Add</button>

<button onclick="removePodcast()">Remove</button>

<button onclick="savePodcastsToStorage()">Save to Storage</button>

<button onclick="loadPodcastsFromStorage()">Load from Storage</button>

<button onclick="savePodcastsToFile()">Export to File</button>

<button onclick="importPodcastsFromFile()">Import from File</button>

<input type="file" id="fileInput" style="display: none;" onchange="handleFileImport()" accept=".json">

</div>

</div>

Then, the CSS for button-group:

.button-group {

margin-top: 0.5rem;

display: flex;

gap: 0.5rem;

}

This will arrange the Run and More buttons next to each other.

Now, compiling all the adjustments:

HTML structure:

<div class="form-container">

<div id="line_1">

<label for="podcast_id">Podcast Search Term</label>

<input type="text" id="podcast_id" name="podcast_id">

</div>

<select id="builtin_id" onchange="chain_action()">

<option selected disabled>Select Program</option>

<option value="Nutrition Facts with Dr. Greger" selected="selected">Nutrition Facts with Dr. Greger</option>

<option value="The Real Truth About Health">The Real Truth About Health</option>

</select>

<div id="line_3">

<label for="cors_proxy">CORS Proxy</label>

<input type="text" id="cors_proxy" name="cors_proxy" value="https://cors-anywhere.herokuapp.com/">

<div class="button-group">

<button onclick="run_it()">Run</button>

<button onclick="toggleMore()">More</button>

</div>

<div class="more-buttons" style="display: none;">

<!-- More buttons here -->

</div>

</div>

</div>

CSS:

.form-container > * {

margin-bottom: 1rem;

}

.form-container label {

display: block;

margin-bottom: 0.5rem;

}

.form-container input,

.form-container select {

width: 100%;

box-sizing: border-box;

padding: 0.5rem;

}

.button-group {

margin-top: 0.5rem;

display: flex;

gap: 0.5rem;

}

/* Ensure the select element is block-level */

.form-container select {

display: block;

}

This should satisfy the requirements:

1. line_1's input is full width.

2. The select is block-level and full width.

3. line_3's input is full width, with Run and More buttons next to each other.

4. All lines are spaced vertically with margin-bottom.

Additionally, the invalid nested buttons inside the More button are fixed by moving them into a separate container.

Final checks:

- All inputs and selects are 100% width.

- The select is display: block.

- Each main element (line_1, select, line_3) has margin-bottom for spacing.

- Buttons in line_3 are arranged with flexbox to be next to each other.

- Labels are block elements above their inputs.