Create a single HTML file containing CSS and JavaScript to generate an animated weather card. The card should visually represent the following weather conditions with distinct animations: Wind: (e.g., moving clouds, swaying trees, or wind lines) Rain: (e.g., falling raindrops, puddles forming) Sun: (e.g., shining rays, bright background) Snow: (e.g., falling snowflakes, snow accumulating) Show all the weather card side by side The card should have a dark background. Provide all the HTML, CSS, and JavaScript code within this single file. The JavaScript should include a way to switch between the different weather conditions (e.g., a function or a set of buttons) to demonstrate the animations for each.


<think>

Okay, the user wants a single HTML file with CSS and JavaScript to create an animated weather card showing different conditions like wind, rain, sun, and snow. They need all four cards side by side with a dark background, and a way to switch between them. Let me start by planning the structure.

First, the HTML structure. Each weather condition will have its own div card. So I'll create a container with four cards. Each card will have an animation area and maybe some controls. Since they need to be side by side, I'll use flexbox on the container to display them inline.

The CSS needs to style each card with a dark background. Maybe a black or dark gray. Each animation (like clouds moving for wind, raindrops falling, etc.) should be implemented with CSS animations or keyframes. For example, raindrops could be animated with translateY to move down, then loop. Snowflakes might need a similar approach but with slower speed and maybe some randomness in direction or size.

JavaScript will handle the switching between conditions. Maybe each card has a button or some control to toggle the animations. Alternatively, the user might want to switch all at once, but the problem says "demonstrate the animations for each" so probably each card can be individually controlled.

Wait, the user said "show all the weather cards side by side" so maybe each card is a separate one, each showing a different condition, but the JavaScript allows switching which animation is active. Hmm, actually, the problem says "the card should visually represent the following weather conditions with distinct animations" and "show all the weather card side by side". Maybe each card is a separate container, each representing a different weather, but the user can switch which one is active? Or perhaps each card can have all animations, and the user can toggle which is displayed. Hmm, maybe the cards are all present, but each has a different animation by default, but with buttons to switch between different conditions per card? That might complicate things.

Wait, the problem says "the card should have a dark background" but "show all the weather card side by side". Maybe each of the four cards (wind, rain, sun, snow) are all displayed, each with their own animation. But the JavaScript should allow switching between the different conditions. Wait, perhaps each card can show any of the weather conditions, and the buttons let you switch which one is active. Hmm, perhaps the user wants each card to represent a different weather, so all four are displayed at once, each with their own animation. That would make sense. Then the JavaScript can just start all animations, but the user might want to toggle between them. Wait, the problem says "the JavaScript should include a way to switch between the different weather conditions (e.g., a function or a set of buttons) to demonstrate the animations for each". So perhaps each card can have multiple states (different weather conditions), and the buttons allow you to switch which one is active on each card. But that might require more complex code.

Alternatively, maybe the user wants a single card that can switch between the different weather conditions, but the problem says "show all the weather cards side by side". Hmm, maybe each of the four weather conditions is a separate card, all displayed at once, each with their own animation. Then the JavaScript just starts all animations. But the problem also mentions switching between them. Maybe there's a button to cycle through the different weathers for each card? Not sure. Let me re-read the problem.

"Create a single HTML file containing CSS and JavaScript to generate an animated weather card. The card should visually represent the following weather conditions with distinct animations... Show all the weather card side by side. The card should have a dark background. Provide all the HTML, CSS, and JavaScript code within this single file. The JavaScript should include a way to switch between the different weather conditions (e.g., a function or a set of buttons) to demonstrate the animations for each."

Ah, maybe the user wants multiple cards (each with a different weather condition), displayed side by side, each with their own animation. But the JavaScript allows switching between the different conditions on each card. Wait, but each card would already represent one condition. Maybe the user wants each card to have a button that allows switching between all conditions, so each card can be changed to any weather. That would require each card to have all the elements for all weathers, but only show the active one.

Alternatively, perhaps the main card is a single card that can be switched between different weather conditions, and there are four such cards displayed side by side. Hmm, not sure. Maybe the user wants four separate cards, each showing one weather, and the user can switch between the different weathers for each card. But that might be too much. Let me think of a simpler approach.

Perhaps the simplest way is to have four separate cards, each with their own weather condition (wind, rain, sun, snow), each with their own animation. The JavaScript could have buttons to toggle which animations are active, but maybe the user just wants all four animations running simultaneously, each in their own card. Since the user says "the card should visually represent the following weather conditions", plural, but "show all the weather card side by side", plural again. So each card is a different weather, displayed together. So four cards, each with their own animation, no switching needed except perhaps to toggle their visibility? Wait, the problem says the JS should include a way to switch between the conditions. Maybe each card can cycle through all the conditions when a button is pressed, so the user can see each animation.

Alternatively, perhaps each card has a button that allows you to switch its weather condition between the four options, so you can see the animations for each. That might be the way.

So, structuring the HTML: a container with four cards. Each card has a title (like "Wind", "Rain", etc.), an animation area, and buttons to switch between the conditions. The JavaScript would handle the button clicks to toggle the class on the card, which would switch the active weather's animation.

Let me start coding.

First, the HTML structure:

<div class="container">
<div class="weather-card" id="wind-card">
<div class="controls">
<button onclick="switchWeather('wind')">Wind</button>
<button onclick="switchWeather('rain')">Rain</button>
<button onclick="switchWeather('sun')">Sun</button>
<button onclick="switchWeather('snow')">Snow</button>
</div>
<div class="animation-area"></div>
</div>
<!-- Repeat for Rain, Sun, Snow cards -->
</div>

Wait, but if each card has its own set of buttons, that's redundant. Maybe have a single set of buttons outside, and a function that cycles all cards. Or perhaps each card can have its own button to cycle through the conditions. Alternatively, the buttons can control all cards, but that's not clear. Alternatively, the user wants to switch between the conditions on each card individually. Hmm, this is getting a bit complicated.

Alternatively, maybe all four conditions are present in each card, and the JavaScript toggles which is visible. So each card has all the elements for wind, rain, sun, snow, but only one is shown at a time. The buttons can then switch which one is displayed, triggering their respective animations.

This approach might be better. So each card has all the elements, and when you click a button, it shows that weather's elements and starts their animation.

Let me outline:

HTML:

<div class="container">
<div class="weather-card">
<div class="controls">
<button onclick="setWeather(this, 'wind')">Wind</button>
<button onclick="setWeather(this, 'rain')">Rain</button>
<button onclick="setWeather(this, 'sun')">Sun</button>
<button onclick="setWeather(this, 'snow')">Snow</button>
</div>
<div class="animation-area">
<div class="wind-layer"></div>
<div class="rain-layer"></div>
<div class="sun-layer"></div>
<div class="snow-layer"></div>
</div>
</div>
<!-- Repeat three more times for four cards -->
</div>

Then, in CSS, each layer is hidden by default, and when the weather is selected, the corresponding layer is shown and the animation is triggered.

In JavaScript, the setWeather function would find the parent card, hide all layers except the selected one, and maybe start the animation.

But animations are usually CSS animations, so perhaps when the layer is shown, the animation is applied automatically via CSS classes.

Alternatively, using CSS keyframes for each animation, and adding/removing classes to start the animation.

Alternatively, use CSS animations that loop indefinitely when visible.

Hmm, let me think step by step.

First, each card's animation area has divs for each weather condition's elements (wind clouds, raindrops, etc). Each of these is hidden by default with display: none, or opacity 0.

When the user clicks a button, the corresponding elements are displayed, and their animations start.

The CSS animations can be set to run when the elements are visible.

Alternatively, use transitions or animations that start when a class is added.

For example:

The wind-layer has an animation for moving clouds, which is applied when the class 'active' is added.

So in CSS:

.wind-layer {
opacity: 0;
animation: none;
}

.wind-layer.active {
opacity: 1;
animation: wind 2s infinite linear;
}

Then, in JS, when the button is clicked, the corresponding layer gets the active class.

But each card can only have one active layer at a time, so when a new weather is selected, the previous active layer's class is removed, and the new one is added.

This seems manageable.

Now, the four cards side by side: the container uses display: flex, so the cards are next to each other.

The background color for each card is dark, like black or a dark shade.

Now, the animations:

For Wind: maybe moving clouds. Create a few cloud elements, positioned absolutely, with an animation that moves them from right to left.

Rain: raindrops falling, using keyframes to move from top to bottom, then reset.

Sun: maybe a sun icon with rays that pulse or get brighter, and a background that lightens.

Snow: snowflakes falling, perhaps with different sizes and paths, accumulating at the bottom.

Each of these would be separate animations.

Let me outline the CSS for each.

Wind:

.cloud {
background: white;
border-radius: 50%;
position: absolute;
animation: moveCloud 3s linear infinite;
}

But need to vary the speed and position for each cloud.

Alternatively, using multiple instances with different delays.

Alternatively, use a pseudo-element approach, but that might be more complex.

Alternatively, use a gradient or a repeating pattern for the wind lines.

Hmm, maybe for simplicity, the wind layer can have lines that move from right to left, like wind lines. That could be done with a linear gradient and an animation that shifts it.

Alternatively, use SVG lines, but perhaps CSS is better for simplicity.

Let me think of the wind as moving lines. For example, a div with a background that's a series of lines, and then an animation that shifts the background so it looks like the lines are moving.

So in CSS:

.wind-layer {
background: linear-gradient(transparent 50%, #fff 50%) no-repeat;
background-size: 200% 100%;
animation: wind 2s linear infinite;
}

@keyframes wind {
to {
background-position-x: -100%;
}
}

This creates a moving gradient that looks like wind lines.

That could work. Similarly, rain can be done with multiple divs falling.

Rain:

.raindrop {
background: #00f;
width: 2px;
height: 10px;
position: absolute;
animation: fall 1.5s linear infinite;
}

Each raindrop would have a different delay and position. Maybe using multiple instances with different left positions and delays.

But generating them via JavaScript might be easier than writing in CSS.

Alternatively, in the CSS for the rain-layer, use a pseudo-element to generate raindrops via a gradient or some other method, but that might be tricky.

Alternatively, in the HTML for the rain-layer, have multiple raindrop divs, each with an animation.

But for simplicity, maybe use a pseudo-element for each raindrop or use a canvas. But since the user wants HTML/CSS/JS, perhaps using multiple elements with JS to create them.

Hmm, perhaps better to use CSS animations with multiple raindrop elements generated via pseudo-elements or a loop in JS.

Alternatively, in the rain-layer, we can have a div with multiple raindrop elements, each with a different animation delay.

Like:

.rain-layer {
position: relative;
height: 100%;
}

.raindrop {
position: absolute;
width: 2px;
height: 15px;
background: #00f;
animation: drop 2s linear infinite;
}

Then in JavaScript, create a number of raindrops with random positions and delays.

Wait, but the user wants the code to be self-contained, so maybe in the HTML, we can have a loop in JS to generate them when the page loads.

Alternatively, in CSS, use a repeating pattern with multiple raindrops.

Alternatively, use a for loop in the JavaScript to create the raindrops when the rain is activated.

Hmm, perhaps that's the way to go.

So, for each weather layer:

Wind: uses a moving gradient as lines.
Rain: uses multiple divs (raindrops) that fall from top to bottom, with random positions and delays.
Sun: has a sun icon and rays that pulse, and the background color changes to a light yellow.
Snow: similar to rain but with white flakes, slower falling, and accumulating at the bottom (maybe a snowdrift at the bottom of the card).
Alright, let me structure the code.

Starting with HTML:

The container holds four weather-card divs.

Each weather-card has a controls div with four buttons (wind, rain, sun, snow) and an animation-area div that holds all the layers for each weather.

So the HTML structure would be like:

<div class="container">
<div class="weather-card">
<div class="controls">
<button onclick="setWeather(this, 'wind')">Wind</button>
<button onclick="setWeather(this, 'rain')">Rain</button>
<button onclick="setWeather(this, 'sun')">Sun</button>
<button onclick="setWeather(this, 'snow')">Snow</button>
</div>
<div class="animation-area">
<div class="wind-layer"></div>
<div class="rain-layer"></div>
<div class="sun-layer"></div>
<div class="snow-layer"></div>
</div>
</div>
<!-- Repeat for three more cards -->
</div>

Wait, but the user wants all the cards to be shown side by side. So four instances of the weather-card div. Each will have their own controls and animation layers.

But this would require a lot of HTML. Alternatively, use a loop in JavaScript to create them, but since it's a single file, maybe better to write them out manually.

Alternatively, the user might prefer that each card is a separate container with its own elements, but that's more code. Let me proceed.

Now, the CSS.

The container uses flex to display the cards side by side.

.container {
display: flex;
gap: 20px;
padding: 20px;
}

.weather-card {
width: 200px;
height: 300px;
background-color: #000;
position: relative;
border-radius: 10px;
overflow: hidden;
}

.controls {
padding: 10px;
background: rgba(0,0,0,0.5);
}

.animation-area {
height: 100%;
position: relative;
}

Each layer (wind, rain, etc.) is initially hidden, and shown when their weather is selected.

So:

.wind-layer, .rain-layer, .sun-layer, .snow-layer {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: none;
}

Then, when a weather is active, its layer is displayed.

But perhaps using opacity and transitions would be better, but for now, display: none is okay.

Alternatively, use a class 'active' to show them.

So in JavaScript, when setting the weather, we can do:

function setWeather(button, weatherType) {
const card = button.closest('.weather-card');
// Hide all layers
const layers = card.querySelectorAll('.animation-area > div');
layers.forEach(layer => layer.style.display = 'none');
// Show the selected layer
const selectedLayer = card.querySelector('.' + weatherType + '-layer');
selectedLayer.style.display = 'block';
// Maybe start animations here, but they can be triggered by CSS
}

But the animations should start when the layer is visible. So in the CSS, the animations can be applied when the layer is displayed.

So for each layer's CSS:

.wind-layer {
background: linear-gradient(transparent 50%, #fff 50%) no-repeat;
background-size: 200% 100%;
animation: wind 2s linear infinite;
}

@keyframes wind {
to {
background-position-x: -100%;
}
}

.rain-layer {
/ when displayed, raindrops are created /
/ but maybe need to have the raindrop elements already present /
/ perhaps in the HTML, but that would need JS to create them /
}

Hmm, for the rain-layer, maybe in the HTML, it contains multiple raindrop divs, each with their own animation.

Alternatively, in the CSS for rain-layer, have a pseudo-element to create the rain, but that's tricky. Alternatively, in the CSS, use a before pseudo-element with a gradient or something, but it's not straightforward.

Alternatively, in the rain-layer's CSS, use a repeating linear gradient to create the rain effect. Not sure.

Alternatively, in JavaScript, when the rain-layer is displayed, dynamically create the raindrop elements.

So when the user selects rain for a card, the JS code would generate a number of raindrop divs within the rain-layer, each with their own animation.

This approach requires some JavaScript to handle the creation.

Let me think of the steps:

When the user selects a weather (e.g., Rain), the rain-layer is shown, and the raindrop elements are created inside it.
So in the setWeather function, after showing the layer, if it's the rain-layer, then create raindrops.

Alternatively, pre-create all possible elements and just show/hide them.

Hmm, perhaps the best approach is to have all the elements in the HTML but hidden, and only show the ones needed.

Alternatively, the rain-layer has a class that when active, triggers the raindrop creation.

Alternatively, let's structure each layer's content:

Wind-layer: as before with the gradient animation.

Rain-layer: contains multiple div.raindrop elements with their own divs for raindrops, each with their own animation.

Sun-layer: a sun icon (maybe a circle with rays) and a background color change.

Snow-layer: similar to rain, but with snowflakes.

So in the HTML for each card:

The rain-layer would have, say, 20 raindrop divs as children.

But writing all that in HTML for each of four cards would be tedious. Maybe better to use JavaScript to generate them when the page loads, or when the layer is activated.

Alternatively, use a template in the HTML for each card and clone it, but that might be complex.

Alternatively, use a for loop in the JavaScript to create the raindrops when the rain layer is activated.

Let me outline the code for the rain-layer.

When the user selects rain, the rain-layer is shown. Then, if it hasn't been initialized yet, create the raindrop elements inside it.

So in the setWeather function:

function setWeather(button, weatherType) {
const card = button.closest('.weather-card');
const layers = card.querySelectorAll('.animation-area > div');
layers.forEach(layer => layer.style.display = 'none');

const selectedLayer = card.querySelector('.' + weatherType + '-layer');  
selectedLayer.style.display = 'block';

if (weatherType === 'rain') {  
    if (selectedLayer.querySelector('.raindrop') === null) {  
        // Create raindrops  
        for (let i = 0; i < 20; i++) {  
            const raindrop = document.createElement('div');  
            raindrop.className = 'raindrop';  
            raindrop.style.left = Math.random() * 100 + '%';  
            raindrop.style.animationDelay = Math.random() * 2 + 's';  
            selectedLayer.appendChild(raindrop);  
        }  
    }  
}
Copy
}

But this requires the raindrop elements to have the necessary CSS animations.

The CSS for raindrop:

.raindrop {
position: absolute;
width: 2px;
height: 15px;
background: #00f;
animation: drop 2s linear infinite;
}

@keyframes drop {
0% { transform: translateY(-100%); }
100% { transform: translateY(120%); }
}

This makes the raindrop fall from above the card to below.

Similarly, for snow, but with a slower animation and maybe different color and size.

So snow-layer's snowflakes could be white, larger, and have a slower animation.

.snow-layer {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}

.snowflake {
position: absolute;
width: 4px;
height: 4px;
background: white;
border-radius: 50%;
animation: snow 5s linear infinite;
}

The animation for snow:

@keyframes snow {
0% { transform: translateY(-100%) rotate(0deg); }
1.5% { transform: translateY(-100%) rotate(45deg); }
100% { transform: translateY(120%) rotate(360deg); }
}

This creates a slow falling effect with some rotation.

For the sun-layer, perhaps a sun icon in the center with a glowing effect, and a background that lightens.

.sun-layer {
display: flex;
justify-content: center;
align-items: center;
background-color: #fffa;
border-radius: 50%;
width: 60px;
height: 60px;
animation: pulse 2s infinite;
}

But maybe better to have a sun element with rays.

Alternatively:

.sun-layer {
background-color: #fffa;
animation: backgroundPulse 3s infinite;
}

.sun-icon {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 50px;
height: 50px;
border-radius: 50%;
background: #ff0;
box-shadow: 0 0 20px #ff0;
animation: pulse 2s infinite;
}

Then in the sun-layer's HTML:

<div class="sun-layer">
<div class="sun-icon"></div>
</div>

The CSS for the animations:

@keyframes pulse {
0% { transform: scale(1); }
50% { transform: scale(1.1); }
100% { transform: scale(1); }
}

@keyframes backgroundPulse {
0% { background-color: #fffa; }
50% { background-color: #ffff; }
100% { background-color: #fffa; }
}

This makes the sun icon pulse and the background color change.

Putting this all together, the HTML for each card would need the sun-layer with the sun-icon inside.

But this requires adding the sun-icon in the HTML for each card's sun-layer.

Alternatively, in JavaScript, when the sun-layer is activated, add the sun-icon element if it doesn't exist.

But this might complicate the code. Maybe better to have the sun-icon in the HTML initially but hidden, then shown when needed.

Hmm, perhaps this is getting too involved, but I need to proceed.

Now, putting it all together:

The full HTML would have four weather-card elements, each with their controls and animation-area containing all four layers (wind, rain, sun, snow). Each layer's content is either present in the HTML with hidden styles or created dynamically via JavaScript.

Given the time constraints, I'll proceed with writing the code, using some dynamic elements for rain and snow.

Putting it all together, here's the code structure:

HTML:

<div class="container">
<div class="weather-card">
<div class="controls">
<button onclick="setWeather(this, 'wind')">Wind</button>
<button onclick="setWeather(this, 'rain')">Rain</button>
<button onclick="setWeather(this, 'sun')">Sun</button>
<button onclick="setWeather(this, 'snow')">Snow</button>
</div>
<div class="animation-area">
<div class="wind-layer"></div>
<div class="rain-layer"></div>
<div class="sun-layer"></div>
<div class="snow-layer"></div>
</div>
</div>
<!-- Repeat for three more cards -->
</div>

CSS:

/ Global styles /
body {
margin: 0;
padding: 0;
background-color: #1a1a1a;
}

.container {
display: flex;
justify-content: center;
gap: 20px;
padding: 20px;
}

.weather-card {
width: 200px;
height: 300px;
background-color: #000;
position: relative;
border-radius: 10px;
overflow: hidden;
box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.controls {
padding: 10px;
background-color: rgba(0,0,0,0.7);
border-bottom: 1px solid rgba(255,255,255,0.2);
}

.controls button {
background-color: rgba(0,0,0,0.5);
border: none;
color: white;
padding: 8px 12px;
margin-right: 5px;
cursor: pointer;
border-radius: 4px;
}

.controls button:hover {
background-color: rgba(0,0,0,0.3);
}

.animation-area {
height: 100%;
position: relative;
}

/ Weather layers /
.wind-layer, .rain-layer, .sun-layer, .snow-layer {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: none;
}

/ Wind /
.wind-layer {
background: linear-gradient(transparent 50%, #fff 50%) no-repeat;
background-size: 200% 100%;
animation: wind 2s linear infinite;
}

@keyframes wind {
to {
background-position-x: -100%;
}
}

/ Rain /
.rain-layer .raindrop {
position: absolute;
width: 2px;
height: 15px;
background: #00f;
animation: drop 2s linear infinite;
}

@keyframes drop {
0% { transform: translateY(-100%); }
100% { transform: translateY(120%); }
}

/ Sun /
.sun-layer {
background-color: #fffa;
animation: backgroundPulse 3s infinite;
}

.sun-layer .sun-icon {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 50px;
height: 50px;
border-radius: 50%;
background: #ff0;
box-shadow: 10px 10px 30px rgba(255, 255, 0, 0.5);
animation: pulse 2s infinite;
}

@keyframes pulse {
0% { transform: scale(1); }
50% { transform: scale(1.1); }
100% { transform: scale(1); }
}

@keyframes backgroundPulse {
0% { background-color: #fffa; }
50% { background-color: #ffff; }
100% { background-color: #fffa; }
}

/ Snow /
.snow-layer .snowflake {
position: absolute;
width: 4px;
height: 4px;
background: white;
border-radius: 50%;
animation: snow 5s linear infinite;
}

@keyframes snow {
0% { transform: translateY(-100%); }
100% { transform: translateY(120%); }
}

JavaScript:

function setWeather(button, weatherType) {
const card = button.closest('.weather-card');
const layers = card.querySelectorAll('.animation-area > div');
layers.forEach(layer => layer.style.display = 'none');

const selectedLayer = card.querySelector('.' + weatherType + '-layer');  
selectedLayer.style.display = 'block';

// Initialize rain and snow elements if needed  
if (weatherType === 'rain') {  
    if (selectedLayer.querySelector('.raindrop') === null) {  
        for (let i = 0; i < 20; i++) {  
            const raindrop = document.createElement('div');  
            raindrop.className = 'raindrop';  
            raindrop.style.left = Math.random() * 100 + '%';  
            raindrop.style.animationDelay = Math.random() * 2 + 's';  
            selectedLayer.appendChild(raindrop);  
        }  
    }  
} else if (weatherType === 'snow') {  
    if (selectedLayer.querySelector('.snowflake') === null) {  
        for (let i = 0; i < 15; i++) {  
            const snowflake = document.createElement('div');  
            snowflake.className = 'snowflake';  
            snowflake.style.left = Math.random() * 100 + '%';  
            snowflake.style.animationDelay = Math.random() * 4 + 's';  
            selectedLayer.appendChild(snowflake);  
        }  
    }  
}

// Initialize sun icon if needed  
if (weatherType === 'sun') {  
    if (selectedLayer.querySelector('.sun-icon') === null) {  
        const sunIcon = document.createElement('div');  
        sunIcon.className = 'sun-icon';  
        selectedLayer.appendChild(sunIcon);  
    }  
}
Copy
}

// Initialize the first card's layers
document.addEventListener('DOMContentLoaded', () => {
const cards = document.querySelectorAll('.weather-card');
cards.forEach(card => {
const layers = card.querySelectorAll('.animation-area > div');
layers[0].style.display = 'block'; // default to wind
setWeather(layers[0], 'wind'); // to initialize rain/snow
});
});

Wait, but in the initialization, I might need to trigger the setWeather function for each card's first layer to ensure the raindrops and snowflakes are created. Alternatively, when the page loads, each card could default to a particular weather, and the setWeather is called to initialize the elements.

Hmm, maybe the code above will handle it. Let me check.

When the DOMContentLoaded event fires, it loops through all cards and calls setWeather on their first layer (assuming the first is wind). That would trigger the creation of raindrops and snowflakes for the first card. Wait, no, because for the first layer (wind-layer), the weatherType is 'wind', so the else if for rain and snow won't execute. Hmm, so the initial setup might not create the rain/snow elements until they're selected.

Therefore, when a user first selects rain on a card, the raindrops will be created then.

That's okay, but the initial state of each card could be set to wind, which doesn't require any creation.

Alternatively, the default could be sun, which requires the sun-icon to be created.

Hmm, but the code should work as is.

Testing this code:

When a card is first displayed, it shows the wind layer, which has the gradient animation.

When the user clicks Rain, the rain-layer is displayed, and the raindrops are created (since they were null before).

Similarly for snow.

The sun-layer will have the sun icon added when selected.

This should work.

Now, to write the complete HTML file with all four cards.

But writing four weather-card divs manually would be tedious. Let me see if there's a way to loop in the HTML, but since it's a single file, perhaps better to write them out.

Alternatively, in the JavaScript, dynamically create the cards, but the user wants a single HTML file with all code.

So here's the full HTML file:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Animated Weather Cards</title>
<style>
body {
margin: 0;
padding: 0;
background-color: #1a1a1a;
}

    .container {  
        display: flex;  
        justify-content: center;  
        gap: 20px;  
        padding: 20px;  
    }

    .weather-card {  
        width: 200px;  
        height: 300px;  
        background-color: #000;  
        position: relative;  
        border-radius: 10px;  
        overflow: hidden;  
        box-shadow: 0 0 10px rgba(0,0,0,0.5);  
    }

    .controls {  
        padding: 10px;  
        background-color: rgba(0,0,0,0.7);  
        border-bottom: 1px solid rgba(255,255,255,0.2);  
    }

    .controls button {  
        background-color: rgba(0,0,0,0.5);  
        border: none;  
        color: white;  
        padding: 8px 12px;  
        margin-right: 5px;  
        cursor: pointer;  
        border-radius: 4px;  
    }

    .controls button:hover {  
        background-color: rgba(0,0,0,0.3);  
    }

    .animation-area {  
        height: 100%;  
        position: relative;  
    }

    .wind-layer, .rain-layer, .sun-layer, .snow-layer {  
        position: absolute;  
        top: 0;  
        left: 0;  
        width: 100%;  
        height: 100%;  
        display: none;  
    }

    /* Wind */  
    .wind-layer {  
        background: linear-gradient(transparent 50%, #fff 50%) no-repeat;  
        background-size: 200% 100%;  
        animation: wind 2s linear infinite;  
    }

    @keyframes wind {  
        to {  
            background-position-x: -100%;  
        }  
    }

    /* Rain */  
    .rain-layer .raindrop {  
        position: absolute;  
        width: 2px;  
        height: 15px;  
        background: #00f;  
        animation: drop 2s linear infinite;  
    }

    @keyframes drop {  
        0% { transform: translateY(-100%); }  
        100% { transform: translateY(120%); }  
    }

    /* Sun */  
    .sun-layer {  
        background-color: #fffa;  
        animation: backgroundPulse 3s infinite;  
    }

    .sun-layer .sun-icon {  
        position: absolute;  
        top: 50%;  
        left: 50%;  
        transform: translate(-50%, -50%);  
        width: 50px;  
        height: 50px;  
        border-radius: 50%;  
        background: #ff0;  
        box-shadow: 10px 10px 30px rgba(255, 255, 0, 0.5);  
        animation: pulse 2s infinite;  
    }

    @keyframes pulse {  
        0% { transform: scale(1); }  
        50% { transform: scale(1.1); }  
        100% { transform: scale(1); }  
    }

    @keyframes backgroundPulse {  
        0% { background-color: #fffa; }  
        50% { background-color: #ffff; }  
        100% { background-color: #fffa; }  
    }

    /* Snow */  
    .snow-layer .snowflake {  
        position: absolute;  
        width: 4px;  
        height: 4px;  
        background: white;  
        border-radius: 50%;  
        animation: snow 5s linear infinite;  
    }

    @keyframes snow {  
        0% { transform: translateY(-100%); }  
        100% { transform: translateY(120%); }  
    }  
</style>
Copy
</head>
<body>
<div class="container">
<!-- First Weather Card -->
<div class="weather-card">
<div class="controls">
<button onclick="setWeather(this, 'wind')">Wind</button>
<button onclick="setWeather(this, 'rain')">Rain</button>
<button onclick="setWeather(this, ' div.raindrop elements with animations.

Sun-layer: contains a sun icon and some rays.

Snow-layer: similar to rain but with snowflakes.

So, for Rain-layer:

In the HTML, within the rain-layer, have a div that holds the raindrops.

<div class="rain-layer">
<div class="rain-container"></div>
</div>

Then. Then in JavaScript, when the rain-layer is activated, create a number of raindrops inside .rain-container.

So in the setWeather function:

if (weatherType === 'rain') {
const rainContainer = selectedLayer.querySelector('.rain-container');
// Generate raindrops if they don't exist yet
if (rainContainer.childElementCount === 0) {
for (let i = 0; i < 20; i++) {
const raindrop = document.createElement('div');
raindrop.className = 'raindrop';
raindrop.style.left = Math.random() * 100 + '%';
// set some random delay
raindrop.style.animationDelay = Math.random() * 2 + 's';
rainContainer.appendChild(raindrop);
}
}
}

Similarly for snow, maybe.

Alternatively, this could be done in the CSS for the raindrop elements.

Alternatively, the raindrops can be generated via CSS with multiple pseudo-elements, but that's complex.

Alternatively, the rain-layer can have a CSS animation for a raindrop-like effect without using multiple elements. Maybe a linear gradient that moves down.

Hmm, but that might not look as realistic. Maybe the gradient approach is better for simplicity.

Alternatively, use an SVG for the raindrops, but that's more code.

Alternatively, use a keyframe animation for each raindrop.

Wait, here's an idea for rain:

.rain-layer .raindrop {
position: absolute;
width: 2px;
height: 15px;
background: #00f;
animation: drop 2s linear infinite;
left: calc(var(--x) * 1%);
}

But this would require variables, which might be tricky.

Alternatively, in CSS, using multiple raindrops with different left positions and delays using nth-child pseudo-classes.

But with CSS alone, this is possible but requires a lot of code.

Alternatively, use a for loop in the CSS to generate multiple raindrops, but CSS doesn't support loops.

Hmm, this is getting complicated. Maybe it's better to proceed with the JavaScript approach for rain and snow, as it allows for more dynamic elements.

So, in the JavaScript function setWeather, when the weather is set to rain, check if the raindrops are already present in the rain-layer. If not, create them.

Same for snow.

Now, the Sun-layer: maybe a yellow circle with a gradient background.

.sun-layer {
background: #ffff00;
background: linear-gradient(to bottom, #ffff00, #fff);
border-radius: 50%;
width: 100px;
height: 100px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
animation: pulse 2s infinite;
}

@keyframes pulse {
50% {
transform: scale(1.2);
}
}

The snow-layer can be similar to the rain-layer but with white flakes and a slower animation.

Now, putting this all together.

First, the HTML structure with four weather cards.

Then the CSS for the container, cards, layers, and animations.

JavaScript functions to toggle the layers and generate the rain/snow elements.

Now, let me code this step by step.

Starting with the HTML:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Animated Weather Cards</title>
<style>
/ CSS goes here /
</style>
</head>
<body>
<div class="container">
<!-- First weather card -->
<div class="weather-card">
<div class="controls">
<button onclick="setWeather(this, 'wind')">Wind</button>
<button onclick="setWeather(this, 'rain')">Rain</button>
<button onclick="setWeather(this, 'sun')">Sun</button>
<button onclick="setWeather(this, 'snow')">Snow</button>
</div>
<div class="animation-area">
<div class="wind-layer"></div>
<div class="rain-layer">
<div class="rain-container"></div>
</div>
<div class="sun-layer"></div>
<div class="snow-layer">
<div class="snow-container"></div>
</div>
</div>
</div>
<!-- Repeat for three more cards -->
<!-- Copy-paste the above weather-card three times -->
</div>

<script>  
    // JavaScript functions  
</script>
Copy
</body>
</html>

Okay, but manually copying the weather-card three times is tedious. To save space, maybe just have one and use a loop in JS, but since this is a single file, perhaps it's okay to repeat the HTML four times.

Alternatively, use a template string and loop, but that complicates the code.

Alternatively, the user might not mind having the four cards written out explicitly.

Now, the CSS.

First, the container and card styling.

.container {
display: flex;
gap: 20px;
padding: 20px;
}

.weather-card {
width: 200px;
height: 300px;
background-color: #000;
position: relative;
border-radius: 10px;
overflow: hidden;
}

.controls {
padding: 10px;
background: rgba(0,0,0,0.5);
}

.animation-area {
height: 100%;
position: relative;
}

/ Hide all layers by default /
.wind-layer, .rain-layer, .sun-layer, .snow-layer {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: none;
}

Now, each layer's specific styles.

Wind:

.wind-layer {
background: linear-gradient(transparent 50%, #fff 50%) no-repeat;
background-size: 200% 100%;
animation: wind 2s linear infinite;
}

@keyframes wind {
to {
background-position-x: -100%;
}
}

Rain:

.rain-container {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}

.raindrop {
position: absolute;
width: 2px;
height: 15px;
background: #00f;
animation: drop 2s linear infinite;
}

@keyframes drop {
from {
transform: translateY(-100%);
}
to {
transform: translateY(100%);
}
}

Sun:

.sun-layer {
background: linear-gradient(to bottom, #ffff00, #fff);
border-radius: 50%;
width: 100px;
height: 100px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
animation: pulse 2s infinite;
}

@keyframes pulse {
50% {
transform: translate(-50%, -50%) scale(1.2);
}
}

Snow:

.snow-layer .snow-container {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}

.snowflake {
position: absolute;
width: 4px;
height: 4px;
background: white;
border-radius: 50%;
animation: snowfall 3s linear infinite;
}

@keyframes snowfall {
from {
transform: translateY(-100%);
left: var(--x);
}
to {
transform: translateY(200%);
}
}

Wait, but for the snowflakes, each needs a random position and delay. So perhaps in the CSS, the variables won't work, so we need to set them via JavaScript.

Alternatively, the snowflake's left position can be randomized using inline styles in JavaScript when they are created.

Now, the JavaScript functions.

First, the setWeather function:

function setWeather(button, weatherType) {
const card = button.closest('.weather-card');
// Hide all layers
const layers = card.querySelectorAll('.animation-area > div');
layers.forEach(layer => layer.style.display = 'none');
// Show the selected layer
const selectedLayer = card.querySelector('.' + weatherType + '-layer');
selectedLayer.style.display = 'block';
// Handle specific elements for each weather
if (weatherType === 'rain') {
setupRain(card);
} else if (weatherType === 'snow') {
setupSnow(card);
}
}

Then, setupRain and setupSnow functions to create the raindrops and snowflakes.

function setupRain(card) {
const rainContainer = card.querySelector('.rain-layer .rain-container');
if (rainContainer.childElementCount === 0) {
for (let i = 0; i < 20; i++) {
const raindrop = document.createElement('div');
raindrop.className = 'raindrop';
// Random position
raindrop.style.left = Math.random() * 100 + '%';
// Random delay
raindrop.style.animationDelay = Math.random() * 2 + 's';
rainContainer.appendChild(raindrop);
}
}
}

function setupSnow(card) {
const snowContainer = card.querySelector('.snow-layer .snow-container');
if (snowContainer.childElementCount === 0) {
for (let i = 0; i < 15; i++) {
const snowflake = document.createElement('div');
snowflake.className = 'snowflake';
snowflake.style.left = Math.random() * 100 + '%';
snowflake.style.animationDelay = Math.random() * 3 + 's';
snowContainer.appendChild(snowflake);
}
}
}

Wait, but the snowflake's left position is set via style.left, which is okay.

Also, the snowfall animation needs to have the left position set, but since the left is set in inline styles, the animation can just move them down.

Wait, the snowfall keyframe is:

@keyframes snowfall {
from {
transform: translateY(-100%);
}
to {
transform: translateY(200%);
}
}

But the left position is set via the style.left, so they will start at different horizontal positions.

This should work.

Now, putting all together.

The complete code would have four weather cards, each with their own controls and layers.

I need to ensure that each card has its own rain-container and snow-container, which they do in the HTML structure provided.

Testing this code should display four cards side by side. Each card has buttons to switch between the four weather conditions. Selecting a weather shows the corresponding layer, which starts its animation.

Potential issues:

The rain and snow elements are only created once when the layer is first activated. If the user switches away and back, the elements remain, so it's okay.
The animations for wind, sun, and snow are handled via CSS keyframes, while rain and snow require dynamic elements.
The snowflakes might need a larger height to fall further, but the keyframe moves them down beyond the container.
The sun's pulse animation scales it slightly larger.
This should fulfill the user's request.
</think>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animated Weather Cards</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background: #1a1a1a;
        }
        .container {
            display: flex;
            gap: 20px;
            padding: 20px;
            justify-content: center;
        }
        .weather-card {
            width: 200px;
            height: 300px;
            background-color: #000;
            position: relative;
            border-radius: 10px;
            overflow: hidden;
        }
        .controls {
            padding: 10px;
            background: rgba(0,0,0,0.5);
            display: flex;
            gap: 5px;
        }
        .controls button {
            padding: 5px 10px;
            background: #333;
            border: none;
            color: white;
            cursor: pointer;
            border-radius: 5px;
        }
        .controls button:hover {
            background: #555;
        }
        .animation-area {
            height: 100%;
            position: relative;
        }
        /* Default layer styles */
        .wind-layer, .rain-layer, .sun-layer, .snow-layer {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: none;
        }
        /* Wind styles */
        .wind-layer {
            background: linear-gradient(transparent 50%, #fff 50%) no-repeat;
            background-size: 200% 100%;
            animation: wind 2s linear infinite;
        }
        @keyframes wind {
            to {
                background-position-x: -100%;
            }
        }
        /* Rain styles */
        .rain-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .raindrop {
            position: absolute;
            width: 2px;
            height: 15px;
            background: #00f;
            animation: drop 2s linear infinite;
        }
        @keyframes drop {
            from {
                transform: translateY(-100%);
            }
            to {
                transform: translateY(120%);
            }
        }
        /* Sun styles */
        .sun-layer {
            background: linear-gradient(to bottom, #ffff00, #fff);
            border-radius: 50%;
            width: 100px;
            height: 100px;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            50% {
                transform: translate(-50%, -50%) scale(1.2);
            }
        }
        /* Snow styles */
        .snow-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .snowflake {
            position: absolute;
            width: 4px;
            height: 4px;
            background: white;
            border-radius: 50%;
            animation: snowfall 3s linear infinite;
        }
        @keyframes snowfall {
            from {
                transform: translateY(-100%);
            }
            to {
                transform: translateY(200%);
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <!-- Card 1 -->
        <div class="weather-card">
            <div class="controls">
                <button onclick="setWeather(this, 'wind')">Wind</button>
                <button onclick="setWeather(this, 'rain')">Rain</button>
                <button onclick="setWeather(this, 'sun')">Sun</button>
                <button onclick="setWeather(this, 'snow')">Snow</button>
            </div>
            <div class="animation-area">
                <div class="wind-layer"></div>
                <div class="rain-layer">
                    <div class="rain-container"></div>
                </div>
                <div class="sun-layer"></div>
                <div class="snow-layer">
                    <div class="snow-container"></div>
                </div>
            </div>
        </div>
        <!-- Card 2 -->
        <div class="weather-card">
            <div class="controls">
                <button onclick="setWeather(this, 'wind')">Wind</button>
                <button onclick="setWeather(this, 'rain')">Rain</button>
                <button onclick="setWeather(this, 'sun')">Sun</button>
                <button onclick="setWeather(this, 'snow')">Snow</button>
            </div>
            <div class="animation-area">
                <div class="wind-layer"></div>
                <div class="rain-layer">
                    <div class="rain-container"></div>
                </div>
                <div class="sun-layer"></div>
                <div class="snow-layer">
                    <div class="snow-container"></div>
                </div>
            </div>
        </div>
        <!-- Card 3 -->
        <div class="weather-card">
            <div class="controls">
                <button onclick="setWeather(this, 'wind')">Wind</button>
                <button onclick="setWeather(this, 'rain')">Rain</button>
                <button onclick="setWeather(this, 'sun')">Sun</button>
                <button onclick="setWeather(this, 'snow')">Snow</button>
            </div>
            <div class="animation-area">
                <div class="wind-layer"></div>
                <div class="rain-layer">
                    <div class="rain-container"></div>
                </div>
                <div class="sun-layer"></div>
                <div class="snow-layer">
                    <div class="snow-container"></div>
                </div>
            </div>
        </div>
        <!-- Card 4 -->
        <div class="weather-card">
            <div class="controls">
                <button onclick="setWeather(this, 'wind')">Wind</button>
                <button onclick="setWeather(this, 'rain')">Rain</button>
                <button onclick="setWeather(this, 'sun')">Sun</button>
                <button onclick="setWeather(this, 'snow')">Snow</button>
            </div>
            <div class="animation-area">
                <div class="wind-layer"></div>
                <div class="rain-layer">
                    <div class="rain-container"></div>
                </div>
                <div class="sun-layer"></div>
                <div class="snow-layer">
                    <div class="snow-container"></div>
                </div>
            </div>
        </div>
    </div>

    <script>
        function setWeather(button, weatherType) {
            const card = button.closest('.weather-card');
            const layers = card.querySelectorAll('.animation-area > div');
            layers.forEach(layer => {
                if (layer.classList.contains(`${weatherType}-layer`)) {
                    layer.style.display = 'block';
                    if (weatherType === 'rain') {
                        // Add raindrops dynamically
                        const rainContainer = layer.querySelector('.rain-container');
                        rainContainer.innerHTML = '';
                        for (let i = 0; i < 20; i++) {
                            const drop = document.createElement('div');
                            drop.className = 'raindrop';
                            drop.style.left = `${Math.random() * 100}%`;
                            drop.style.animationDuration = `${Math.random() * 1 + 1.5}s`;
                            rainContainer.appendChild(drop);
                        }
                    } else if (weatherType === 'snow') {
                        // Add snowflakes dynamically
                        const snowContainer = layer.querySelector('.snow-container');
                        snowContainer.innerHTML = '';
                        for (let i = 0; i < 20; i++) {
                            const flake = document.createElement('div');
                            flake.className = 'snowflake';
                            flake.style.left = `${Math.random() * 100}%`;
                            flake.style.animationDuration = `${Math.random() * 2 + 1}s`;
                            snowContainer.appendChild(flake);
                        }
                    }
                } else {
                    layer.style.display = 'none';
                }
            });
        }
    </script>
</body>
</html>