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Mock up a SortableJS example, put it all (javascript, css, and html) into one html file. The items to be moved should be "cards" with text where the cards should be possible to drag and drop horisontally.

Here's a complete HTML file that demonstrates how to use SortableJS to create draggable and horizontally sortable "cards." This file includes all the necessary HTML, CSS, and JavaScript code in one place.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>SortableJS Horizontal Cards Example</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Container for the cards */
        #card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #f0f0f0;
        }
        /* Individual card styling */
        .card {
            width: 150px;
            height: 200px;
            margin: 0 10px;
            padding: 10px;
            background-color: #ffffff;
            border: 1px solid #cccccc;
            border-radius: 5px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
        }
        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }
    </style>
</head>
<body>
    <!-- Container holding the draggable cards -->
    <div id="card-container">
        <div class="card">Card 1 Content</div>
        <div class="card">Card 2 Content</div>
        <div class="card">Card 3 Content</div>
        <div class="card">Card 4 Content</div>
        <div class="card">Card 5 Content</div>
    </div>

    <script>
        // Initialize SortableJS on the card container
        var el = document.getElementById('card-container');
        var sortable = Sortable.create(el, {
            animation: 150, // Animation speed during sorting (ms)
            ghostClass: 'sortable-ghost', // Class name for the drop placeholder
            direction: 'horizontal' // Set the sorting direction to horizontal
        });
    </script>
</body>
</html>

Explanation:

HTML Structure:
- A <div> with the id card-container acts as the container for all the cards.
- Multiple <div class="card"> elements represent individual cards with text content.
CSS Styles:
- #card-container uses Flexbox to arrange cards horizontally (flex-direction: row).
- .card styles define the appearance of each card, including size, margin, padding, background, border, and text alignment.
- .sortable-ghost class provides visual feedback for the card being dragged.
JavaScript Initialization:
- The SortableJS library is included via a CDN link.
- Sortable.create is called on the card-container element to enable drag-and-drop functionality.
- The animation option adds smoothness to the dragging experience.
- The direction: 'horizontal' option ensures that the cards can be dragged horizontally.

Usage:

Simply open the HTML file in a web browser.
You can click and drag any card to reorder them horizontally within the container.

Perfect! Add another horisontal card div, above card-container. THis new div should contain one card that can be dropped into card-container but it shouldn't be possible to drop any cards from card-container into this new div above.

Certainly! Here's the updated HTML file that includes a new horizontal card container above the existing one. This new container holds one card that can be dragged into the card-container but doesn't accept any cards from it.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>SortableJS Horizontal Cards Example with Source Container</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #f0f0f0;
            margin-bottom: 20px;
        }
        /* Individual card styling */
        .card {
            width: 150px;
            height: 200px;
            margin: 0 10px;
            padding: 10px;
            background-color: #ffffff;
            border: 1px solid #cccccc;
            border-radius: 5px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
        }
        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }
    </style>
</head>
<body>
    <!-- New source container holding the initial card -->
    <div id="source-container" class="card-container">
        <div class="card">New Card</div>
    </div>
    <!-- Container holding the draggable cards -->
    <div id="card-container" class="card-container">
        <div class="card">Card 1 Content</div>
        <div class="card">Card 2 Content</div>
        <div class="card">Card 3 Content</div>
        <div class="card">Card 4 Content</div>
        <div class="card">Card 5 Content</div>
    </div>

    <script>
        // Initialize SortableJS on the source container
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                pull: 'clone', // Allow cloning items from this list
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });
    </script>
</body>
</html>

Explanation:

HTML Structure:
- source-container: A new <div> with the id source-container is added above the existing card-container. It contains one card (<div class="card">New Card</div>).
- card-container: The existing container holds multiple cards that can be sorted and accepts new cards from source-container.
CSS Styles:
- .card-container: A common class for both containers to ensure consistent styling and horizontal alignment.
- .card: Styles remain the same to ensure the new card matches the existing ones.
JavaScript Initialization:
- sourceSortable: Initialized on source-container with the following group options:
  - name: 'cards': Assigns the same group name as card-container to allow interaction.
  - pull: 'clone': Allows the card to be dragged (cloned) into card-container.
  - put: false: Prevents any cards from being dropped into source-container.
  - sort: false: Disables sorting within source-container (useful if more cards are added in the future).
- cardSortable: Initialized on card-container with group options:
  - name: 'cards': Same group name to accept cards from source-container.
  - pull: false: Prevents cards from being dragged out to other containers.
  - put: true: Allows cards to be dropped into this container from source-container.
- Common Options:
  - animation: 150: Adds smoothness to the dragging experience.
  - ghostClass: 'sortable-ghost': Applies a visual effect to the dragged card.
  - direction: 'horizontal': Ensures horizontal dragging and dropping.

Usage:

Dragging the New Card:
- You can click and drag the "New Card" from the source-container into the card-container.
- The card is cloned, so the original remains in source-container for future use.
Sorting within card-container:
- Cards within card-container can be rearranged freely.
Restrictions:
- Cards from card-container cannot be moved into source-container.
- The "New Card" in source-container cannot be rearranged within its own container.

Visual Flow:

Initial State:
- source-container at the top with one card: "New Card".
- card-container below with multiple cards.
Dragging "New Card":
- Dragging it into card-container adds a clone of the card.
- The original "New Card" remains in source-container.
After Dragging:
- card-container now contains the new card along with existing ones.
- You can rearrange all cards within card-container.

Feel free to copy this code into an .html file and open it in a web browser to see it in action.

Add a custom attribute to each card called emission_fa, mockup real values here between 0.0 and 100.0 . Also add a button that checks if the cards in card-container are int he right order, that is, with the card with the lowest ef to the left, followed by the card with the second lowest ef, etc.

Certainly! Here's the updated HTML file with the requested features:

Each card now includes a custom attribute emission_fa with mock values between 0.0 and 100.0.
A button has been added to check if the cards in card-container are ordered from lowest to highest emission_fa values.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>SortableJS Horizontal Cards with Emission Factor</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #f0f0f0;
            margin-bottom: 20px;
        }
        /* Individual card styling */
        .card {
            width: 150px;
            height: 200px;
            margin: 0 10px;
            padding: 10px;
            background-color: #ffffff;
            border: 1px solid #cccccc;
            border-radius: 5px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
            position: relative;
        }
        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }
        /* Message display */
        #message {
            font-family: Arial, sans-serif;
            font-size: 18px;
            margin-top: 20px;
        }
        /* Button styling */
        #check-order-btn {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            margin-top: 10px;
        }
        /* Display emission_fa value */
        .emission-value {
            font-size: 14px;
            color: #666;
            position: absolute;
            bottom: 10px;
        }
    </style>
</head>
<body>
    <!-- New source container holding the initial card -->
    <div id="source-container" class="card-container">
        <div class="card" emission_fa="50.0">
            New Card
            <div class="emission-value">EF: 50.0</div>
        </div>
    </div>
    <!-- Container holding the draggable cards -->
    <div id="card-container" class="card-container">
        <div class="card" emission_fa="20.5">
            Card 1 Content
            <div class="emission-value">EF: 20.5</div>
        </div>
        <div class="card" emission_fa="75.2">
            Card 2 Content
            <div class="emission-value">EF: 75.2</div>
        </div>
        <div class="card" emission_fa="10.0">
            Card 3 Content
            <div class="emission-value">EF: 10.0</div>
        </div>
        <div class="card" emission_fa="55.8">
            Card 4 Content
            <div class="emission-value">EF: 55.8</div>
        </div>
        <div class="card" emission_fa="30.1">
            Card 5 Content
            <div class="emission-value">EF: 30.1</div>
        </div>
    </div>

    <!-- Button to check the order -->
    <button id="check-order-btn">Check Order</button>

    <!-- Message display -->
    <div id="message"></div>

    <script>
        // Initialize SortableJS on the source container
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                pull: 'clone', // Allow cloning items from this list
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Function to check if the cards are in correct order
        function checkOrder() {
            var cards = document.querySelectorAll('#card-container .card');
            var isCorrect = true;
            var prevEF = -Infinity;

            for (var i = 0; i < cards.length; i++) {
                var ef = parseFloat(cards[i].getAttribute('emission_fa'));
                if (ef < prevEF) {
                    isCorrect = false;
                    break;
                }
                prevEF = ef;
            }

            var messageEl = document.getElementById('message');
            if (isCorrect) {
                messageEl.style.color = 'green';
                messageEl.textContent = 'Correct order!';
            } else {
                messageEl.style.color = 'red';
                messageEl.textContent = 'Incorrect order. Please arrange the cards from lowest to highest EF.';
            }
        }

        // Add event listener to the button
        var checkOrderBtn = document.getElementById('check-order-btn');
        checkOrderBtn.addEventListener('click', checkOrder);
    </script>
</body>
</html>

Explanation:

Custom Attribute emission_fa:
- Each card now includes a custom attribute emission_fa with a mock value between 0.0 and 100.0.
```
html
<div class="card" emission_fa="20.5">
    Card 1 Content
    <div class="emission-value">EF: 20.5</div>
</div>
```
- The emission_fa value is displayed within each card using a <div class="emission-value"> element.
Button to Check Order:
- A <button> element with the id check-order-btn is added below the card-container.
```
html
<button id="check-order-btn">Check Order</button>
```
- When clicked, it triggers the checkOrder() function to verify if the cards are sorted correctly.

JavaScript Functionality:

checkOrder() Function:

Retrieves all cards within card-container and checks if they are in ascending order based on emission_fa.
Compares each card's emission_fa to the previous one.
Displays a message indicating whether the order is correct.

javascript
function checkOrder() {
    var cards = document.querySelectorAll('#card-container .card');
    var isCorrect = true;
    var prevEF = -Infinity;

    for (var i = 0; i < cards.length; i++) {
        var ef = parseFloat(cards[i].getAttribute('emission_fa'));
        if (ef < prevEF) {
            isCorrect = false;
            break;
        }
        prevEF = ef;
    }

    var messageEl = document.getElementById('message');
    if (isCorrect) {
        messageEl.style.color = 'green';
        messageEl.textContent = 'Correct order!';
    } else {
        messageEl.style.color = 'red';
        messageEl.textContent = 'Incorrect order. Please arrange the cards from lowest to highest EF.';
    }
}

Event Listener:

Adds a click event listener to the "Check Order" button.

javascript
var checkOrderBtn = document.getElementById('check-order-btn');
checkOrderBtn.addEventListener('click', checkOrder);

CSS Styling:

.emission-value: Styles the emission factor display within each card.

css
.emission-value {
    font-size: 14px;
    color: #666;
    position: absolute;
    bottom: 10px;
}

#message: Styles the message displayed after checking the order.

css
#message {
    font-family: Arial, sans-serif;
    font-size: 18px;
    margin-top: 20px;
}

Usage Instructions:

Open the HTML File:
- Save the provided code into a file with a .html extension.
- Open the file in a modern web browser (e.g., Chrome, Firefox).
Interact with the Cards:
- Drag and Drop:
  - Rearrange the cards within the card-container by dragging and dropping them horizontally.
- Add New Cards:
  - Drag the "New Card" from the source-container into the card-container.
  - The "New Card" has its own emission_fa value (e.g., 50.0).
Check the Order:
- Click the "Check Order" button below the card-container.
- A message will appear indicating whether the cards are in the correct order.
  - Correct Order: "Correct order!" displayed in green.
  - Incorrect Order: "Incorrect order. Please arrange the cards from lowest to highest EF." displayed in red.
Objective:
- Arrange the cards in the card-container so that they are ordered from left to right, with the emission_fa values increasing.
- Use the displayed EF values to guide the arrangement.

Example Scenario:

Initial State:
- The cards might not be in the correct order based on their emission_fa values.
- For example, EF values might be: 20.5, 75.2, 10.0, 55.8, 30.1.
Reordering:
- Rearrange the cards to be in ascending order:
  - 10.0, 20.5, 30.1, 55.8, 75.2.
Verification:
- Click "Check Order" to confirm the arrangement.
- The message should display "Correct order!" if arranged properly.

Additional Notes:

Adding More Cards:
- You can duplicate cards or modify the HTML to add more cards with different emission_fa values.
- Ensure each new card includes the emission_fa attribute and displays the EF value.
Customization:
- Feel free to adjust the styling, card content, and emission_fa values to suit your needs.
Browser Compatibility:
- The code uses standard HTML, CSS, and JavaScript features compatible with most modern browsers.

Conclusion:

This interactive example allows users to practice ordering items based on a numerical attribute, providing immediate feedback on their arrangement. It can be a useful tool for educational purposes or demonstrations involving sorting and order validation.

Feel free to copy and paste the code into an HTML file to test it out!

What we're iterating on here is going to be a simple game that's going to go like this: * In the code there's a list with of candidate cards, where each card has a description and an ef value. * Each round the player get's a card, randomly selected without replacement from this list into the source-container. At this point the ef value is hidden from the new card * The player then tries to place the card in the right spot, only knowing the description and the ef values of the other card. Once the place has pressed the check-order-btn the ef value is revealed and the order is checked. * If the order is correct, the player gets a point, and get's to place another card. * If the order is wrong, the game is over, the player sees the total score, and gets an opportunity to start over. Based on the code we have so far, could you mockup this game?

Certainly! Below is the complete HTML file that implements the game as you've described:

Features:
- A list of candidate cards, each with a description and an ef (emission factor) value.
- Each round, a random card (without replacement) is added to the source-container with its ef value hidden.
- The player tries to place the card in the correct position among existing cards that have their ef values displayed.
- After placing the card, the player clicks the "Check Order" button.
  - The ef value of the new card is revealed.
  - The order is checked.
  - If correct, the player gains a point and proceeds to the next round.
  - If incorrect, the game ends, and the total score is displayed.
- The player can restart the game after it ends.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>SortableJS Ordering Game</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #f0f0f0;
            margin-bottom: 20px;
        }
        /* Individual card styling */
        .card {
            width: 150px;
            height: 200px;
            margin: 0 10px;
            padding: 10px;
            background-color: #ffffff;
            border: 1px solid #cccccc;
            border-radius: 5px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
            position: relative;
        }
        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }
        /* Message display */
        #message {
            font-family: Arial, sans-serif;
            font-size: 18px;
            margin-top: 20px;
        }
        /* Button styling */
        #check-order-btn, #restart-btn {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            margin-top: 10px;
            margin-right: 10px;
        }
        /* Display emission_fa value */
        .emission-value {
            font-size: 14px;
            color: #666;
            position: absolute;
            bottom: 10px;
        }
        /* Hide emission value */
        .hidden-ef .emission-value {
            display: none;
        }
    </style>
</head>
<body>
    <!-- Source container for the new card -->
    <div id="source-container" class="card-container">
        <!-- New card will be added here -->
    </div>
    <!-- Container holding the player's cards -->
    <div id="card-container" class="card-container">
        <!-- Existing cards will be added here -->
    </div>

    <!-- Button to check the order -->
    <button id="check-order-btn">Check Order</button>
    <!-- Button to restart the game (hidden initially) -->
    <button id="restart-btn" style="display: none;">Restart Game</button>

    <!-- Message display -->
    <div id="message"></div>

    <!-- Score display -->
    <div id="score" style="font-family: Arial, sans-serif; font-size: 18px; margin-top: 10px;"></div>

    <script>
        // Candidate cards list
        var candidateCards = [
            { description: "Solar Panels", ef: 10.2 },
            { description: "Electric Car", ef: 20.5 },
            { description: "Wind Turbine", ef: 15.0 },
            { description: "Coal Power Plant", ef: 90.0 },
            { description: "Bicycle", ef: 5.0 },
            { description: "Gasoline Car", ef: 70.3 },
            { description: "Hydroelectric Dam", ef: 25.0 },
            { description: "Nuclear Power Plant", ef: 30.0 },
            { description: "Public Transport", ef: 12.0 },
            { description: "Walking", ef: 0.0 }
        ];

        var score = 0;
        var gameOver = false;
        var usedCards = []; // Keep track of used cards
        var currentCard = null; // The card currently in source-container

        // Initialize the game
        function initGame() {
            // Reset variables
            score = 0;
            gameOver = false;
            usedCards = [];
            currentCard = null;

            // Clear containers
            document.getElementById('source-container').innerHTML = '';
            document.getElementById('card-container').innerHTML = '';
            document.getElementById('message').textContent = '';
            document.getElementById('score').textContent = 'Score: ' + score;
            document.getElementById('restart-btn').style.display = 'none';
            document.getElementById('check-order-btn').style.display = 'inline-block';

            // Start the first round
            nextRound();
        }

        // Function to start the next round
        function nextRound() {
            if (usedCards.length === candidateCards.length) {
                // No more cards left
                gameOver = true;
                document.getElementById('message').textContent = 'Congratulations! You have placed all cards correctly!';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
                return;
            }

            // Randomly select a card that hasn't been used
            var remainingCards = candidateCards.filter(function(card) {
                return usedCards.indexOf(card) === -1;
            });

            var randomIndex = Math.floor(Math.random() * remainingCards.length);
            currentCard = remainingCards[randomIndex];
            usedCards.push(currentCard);

            // Create the card element
            var cardDiv = document.createElement('div');
            cardDiv.className = 'card hidden-ef';
            cardDiv.setAttribute('emission_fa', currentCard.ef);
            cardDiv.innerHTML = currentCard.description + '<div class="emission-value">EF: ' + currentCard.ef + '</div>';

            // Add the card to the source-container
            var sourceContainer = document.getElementById('source-container');
            sourceContainer.innerHTML = ''; // Clear previous card
            sourceContainer.appendChild(cardDiv);

            // Re-initialize the source sortable
            sourceSortable.destroy();
            sourceSortable = Sortable.create(sourceContainer, {
                group: {
                    name: 'cards',
                    pull: 'clone',
                    put: false
                },
                sort: false,
                animation: 150,
                ghostClass: 'sortable-ghost',
                direction: 'horizontal'
            });
        }

        // Initialize SortableJS on the source container (empty initially)
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                pull: 'clone', // Allow cloning items from this list
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Function to check if the cards are in correct order
        function checkOrder() {
            var cards = document.querySelectorAll('#card-container .card');
            var isCorrect = true;
            var prevEF = -Infinity;

            for (var i = 0; i < cards.length; i++) {
                var ef = parseFloat(cards[i].getAttribute('emission_fa'));
                if (ef < prevEF) {
                    isCorrect = false;
                    break;
                }
                prevEF = ef;
            }

            // Reveal the ef value of the new card
            var newCards = document.querySelectorAll('#card-container .card.hidden-ef');
            newCards.forEach(function(card) {
                card.classList.remove('hidden-ef');
            });

            var messageEl = document.getElementById('message');
            if (isCorrect) {
                score++;
                document.getElementById('score').textContent = 'Score: ' + score;
                messageEl.style.color = 'green';
                messageEl.textContent = 'Correct order!';
                // Proceed to next round after a short delay
                setTimeout(function() {
                    messageEl.textContent = '';
                    nextRound();
                }, 1000);
            } else {
                gameOver = true;
                messageEl.style.color = 'red';
                messageEl.textContent = 'Incorrect order. Game over! Your total score is ' + score + '.';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
            }
        }

        // Add event listener to the button
        var checkOrderBtn = document.getElementById('check-order-btn');
        checkOrderBtn.addEventListener('click', function() {
            // Check if the new card has been placed into the card-container
            var newCardInContainer = false;
            var cardsInContainer = document.querySelectorAll('#card-container .card');
            for (var i = 0; i < cardsInContainer.length; i++) {
                if (cardsInContainer[i].getAttribute('emission_fa') == currentCard.ef) {
                    newCardInContainer = true;
                    break;
                }
            }
            if (!newCardInContainer) {
                alert('Please place the new card into the sequence.');
                return;
            }
            checkOrder();
        });

        // Add event listener to the restart button
        var restartBtn = document.getElementById('restart-btn');
        restartBtn.addEventListener('click', function() {
            initGame();
        });

        // Start the game
        initGame();
    </script>
</body>
</html>

Explanation:

Candidate Cards:

A JavaScript array candidateCards holds objects, each with a description and an ef value.

javascript
var candidateCards = [
    { description: "Solar Panels", ef: 10.2 },
    { description: "Electric Car", ef: 20.5 },
    // ... other cards
];

Game Variables:
- score: Tracks the player's score.
- gameOver: Indicates whether the game has ended.
- usedCards: Keeps track of cards that have already been played.
- currentCard: The card currently in the source-container.

Game Initialization:

The initGame() function resets all game variables and starts the first round.

javascript
function initGame() {
    // Reset variables
    // Clear containers and messages
    // Start the first round
    nextRound();
}

Next Round Logic:

The nextRound() function selects a random card from candidateCards that hasn't been used yet.

The selected card is added to the source-container with its ef value hidden by applying the hidden-ef CSS class.

javascript
function nextRound() {
    // Check if all cards have been used
    // Select a random unused card
    // Create the card element
    var cardDiv = document.createElement('div');
    cardDiv.className = 'card hidden-ef';
    // Add card to source-container
}

SortableJS Initialization:

Source Container (source-container): Holds the new card for the current round.

Configured to allow cloning the card (since we don't want the original to move).

javascript
var sourceSortable = Sortable.create(sourceEl, {
    group: {
        name: 'cards',
        pull: 'clone',
        put: false
    },
    // Other options...
});

Card Container (card-container): Holds the cards that the player is arranging.

Configured to accept new cards and allow sorting within itself.

javascript
var cardSortable = Sortable.create(cardEl, {
    group: {
        name: 'cards',
        pull: false,
        put: true
    },
    // Other options...
});

Checking the Order:
- The checkOrder() function checks if the cards in card-container are in ascending order based on their emission_fa values.
- Before checking, it verifies that the new card has been placed into card-container.
- Reveals the ef values of any new cards by removing the hidden-ef class.
```
javascript
function checkOrder() {
    // Verify new card placement
    // Reveal 'ef' values
    // Check order
    // Update score or end game
}
```

Event Listeners:

"Check Order" Button:

Triggers the checkOrder() function.
Ensures the player has placed the new card before proceeding.

javascript
checkOrderBtn.addEventListener('click', function() {
    // Ensure new card is placed
    checkOrder();
});

"Restart Game" Button:

Calls initGame() to restart the game.

javascript
restartBtn.addEventListener('click', function() {
    initGame();
});

Game Flow:
1. Start of Game:
  - The game initializes and presents the first card in the source-container.
2. Player Action:
  - The player drags the new card into the card-container, trying to place it correctly among existing cards.
  - Existing cards display their ef values; the new card's ef is hidden.
3. Checking Order:
  - The player clicks "Check Order".
  - The game reveals the ef value of the new card.
  - The order is checked.
  - If correct:
    - The player gains a point.
    - The next round begins automatically after a short delay.
  - If incorrect:
    - The game ends.
    - The player's total score is displayed.
    - The "Restart Game" button appears.
4. Game End:
  - If the player correctly places all cards, a congratulatory message is displayed.
  - The game ends, and the player can restart.

CSS Styling:

.hidden-ef: Hides the emission-value div within the card, concealing the ef value.
```
css
.hidden-ef .emission-value {
    display: none;
}
```

.emission-value: Styles the display of the ef value within each card.

css
.emission-value {
    font-size: 14px;
    color: #666;
    position: absolute;
    bottom: 10px;
}

Visual Feedback:
- Messages are displayed to the player based on their actions:
  - Correct order: "Correct order!" in green.
  - Incorrect order: "Incorrect order. Game over! Your total score is X." in red.
  - All cards placed: "Congratulations! You have placed all cards correctly!"

Usage Instructions:

Open the Game:
- Save the provided code into an HTML file (e.g., ordering-game.html).
- Open the file in a modern web browser (e.g., Chrome, Firefox).
Playing the Game:
- Round Start:
  - A new card appears in the source-container with its description visible and ef value hidden.
- Placing the Card:
  - Drag the new card into the card-container, placing it where you believe it fits based on its ef value relative to the other cards (whose ef values are visible).
- Checking the Order:
  - Click the "Check Order" button.
  - The ef value of the new card is revealed.
  - The game checks if the cards are in ascending order of ef values.
- Outcome:
  - If Correct:
    - The message "Correct order!" appears.
    - Your score increases by 1.
    - The next round begins automatically after a brief pause.
  - If Incorrect:
    - The message "Incorrect order. Game over! Your total score is X." appears.
    - The game ends.
    - The "Restart Game" button becomes available.
Restarting the Game:
- Click the "Restart Game" button to start over from the beginning.
Game Objective:
- Try to correctly place as many cards as possible by accurately estimating where each new card fits in the sequence based on its description and your knowledge of its likely ef value.

Notes:

No Peeking:
- The ef value of the new card is intentionally hidden to challenge the player to use their understanding or intuition about the items described.
Educational Aspect:
- This game can help players learn about the relative emission factors of different technologies or activities.
Extending the Game:
- You can add more cards to the candidateCards array to expand the game's content.
- Adjust the descriptions and ef values to fit different themes or educational goals.

Conclusion:

This interactive game provides an engaging way to test and enhance understanding of emission factors associated with various technologies or activities. By challenging players to order items based on hidden values, it encourages critical thinking and learning through gameplay.

Feel free to copy the code into an HTML file and enjoy the game!

Perfect! I want to make some modifications. It's ok to respond with only the modified code. * I want to start the game with that two cards needs to be placed. after that it's one card per turn, as normal. * When dragging the card from source-container into card-container it should not remain in source-container.

Here are the modifications to implement your requested changes:

Remove the cloning behavior so that dragging a card from source-container moves it instead of cloning:

javascript
// Update the sourceSortable initialization
sourceSortable.destroy();
sourceSortable = Sortable.create(sourceContainer, {
    group: {
        name: 'cards',
        put: false     // Do not allow items to be put into this list
    },
    sort: false,       // Disable sorting within this list
    animation: 150,
    ghostClass: 'sortable-ghost',
    direction: 'horizontal'
});

Start the game with two cards that need to be placed. After that, it's one card per turn as normal:

Add a variable to track the number of cards to place:
```
javascript
var cardsToPlace;
```

Modify the initGame function:

javascript
function initGame() {
    // Reset variables
    score = 0;
    gameOver = false;
    usedCards = [];
    currentCard = null;
    cardsToPlace = 2; // Start with two cards to place

    // Clear containers
    document.getElementById('source-container').innerHTML = '';
    document.getElementById('card-container').innerHTML = '';
    document.getElementById('message').textContent = '';
    document.getElementById('score').textContent = 'Score: ' + score;
    document.getElementById('restart-btn').style.display = 'none';
    document.getElementById('check-order-btn').style.display = 'inline-block';

    // Start the first round
    nextRound();
}

Modify the nextRound function to handle multiple cards:

javascript
function nextRound() {
    if (usedCards.length === candidateCards.length) {
        // No more cards left
        gameOver = true;
        document.getElementById('message').textContent = 'Congratulations! You have placed all cards correctly!';
        document.getElementById('check-order-btn').style.display = 'none';
        document.getElementById('restart-btn').style.display = 'inline-block';
        return;
    }

    // Determine the number of cards to place
    if (!cardsToPlace) {
        cardsToPlace = 1; // After the first round, place one card per turn
    }

    // Randomly select 'cardsToPlace' cards that haven't been used
    var remainingCards = candidateCards.filter(function(card) {
        return usedCards.indexOf(card) === -1;
    });

    if (remainingCards.length < cardsToPlace) {
        cardsToPlace = remainingCards.length;
    }

    // Create cards and add them to the source-container
    var sourceContainer = document.getElementById('source-container');
    sourceContainer.innerHTML = ''; // Clear previous cards

    for (var i = 0; i < cardsToPlace; i++) {
        var randomIndex = Math.floor(Math.random() * remainingCards.length);
        var selectedCard = remainingCards.splice(randomIndex, 1)[0];
        usedCards.push(selectedCard);

        // Create the card element
        var cardDiv = document.createElement('div');
        cardDiv.className = 'card hidden-ef';
        cardDiv.setAttribute('emission_fa', selectedCard.ef);
        cardDiv.innerHTML = selectedCard.description + '<div class="emission-value">EF: ' + selectedCard.ef + '</div>';

        sourceContainer.appendChild(cardDiv);
    }

    // Re-initialize the source sortable
    sourceSortable.destroy();
    sourceSortable = Sortable.create(sourceContainer, {
        group: {
            name: 'cards',
            put: false
        },
        sort: false,
        animation: 150,
        ghostClass: 'sortable-ghost',
        direction: 'horizontal'
    });

    // After the initial round, set cardsToPlace to 1
    cardsToPlace = 1;
}

Update the event listener for the "Check Order" button to ensure all new cards are placed:

javascript
checkOrderBtn.addEventListener('click', function() {
    // Check if all new cards have been placed into the card-container
    var sourceCards = document.querySelectorAll('#source-container .card');
    if (sourceCards.length > 0) {
        alert('Please place all new cards into the sequence.');
        return;
    }
    checkOrder();
});

These modifications will start the game with two cards that need to be placed and ensure that dragging a card from the source-container moves it without leaving a clone behind.

Actually, could your write out the full game code, including these modifications?

Certainly! Below is the complete game code with your requested modifications implemented:

Modifications:
- The game starts with two cards that need to be placed. After that, it's one card per turn as normal.
- When dragging a card from the source-container into the card-container, it does not remain in the source-container.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>SortableJS Ordering Game</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #f0f0f0;
            margin-bottom: 20px;
        }
        /* Individual card styling */
        .card {
            width: 150px;
            height: 200px;
            margin: 0 10px;
            padding: 10px;
            background-color: #ffffff;
            border: 1px solid #cccccc;
            border-radius: 5px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
            position: relative;
        }
        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }
        /* Message display */
        #message {
            font-family: Arial, sans-serif;
            font-size: 18px;
            margin-top: 20px;
        }
        /* Button styling */
        #check-order-btn, #restart-btn {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            margin-top: 10px;
            margin-right: 10px;
        }
        /* Display emission_fa value */
        .emission-value {
            font-size: 14px;
            color: #666;
            position: absolute;
            bottom: 10px;
        }
        /* Hide emission value */
        .hidden-ef .emission-value {
            display: none;
        }
    </style>
</head>
<body>
    <!-- Source container for the new cards -->
    <div id="source-container" class="card-container">
        <!-- New cards will be added here -->
    </div>
    <!-- Container holding the player's cards -->
    <div id="card-container" class="card-container">
        <!-- Existing cards will be added here -->
    </div>

    <!-- Button to check the order -->
    <button id="check-order-btn">Check Order</button>
    <!-- Button to restart the game (hidden initially) -->
    <button id="restart-btn" style="display: none;">Restart Game</button>

    <!-- Message display -->
    <div id="message"></div>

    <!-- Score display -->
    <div id="score" style="font-family: Arial, sans-serif; font-size: 18px; margin-top: 10px;"></div>

    <script>
        // Candidate cards list
        var candidateCards = [
            { description: "Solar Panels", ef: 10.2 },
            { description: "Electric Car", ef: 20.5 },
            { description: "Wind Turbine", ef: 15.0 },
            { description: "Coal Power Plant", ef: 90.0 },
            { description: "Bicycle", ef: 5.0 },
            { description: "Gasoline Car", ef: 70.3 },
            { description: "Hydroelectric Dam", ef: 25.0 },
            { description: "Nuclear Power Plant", ef: 30.0 },
            { description: "Public Transport", ef: 12.0 },
            { description: "Walking", ef: 0.0 }
        ];

        var score = 0;
        var gameOver = false;
        var usedCards = []; // Keep track of used cards
        var currentCards = []; // Cards currently in source-container
        var cardsToPlace; // Number of cards to place this round

        // Initialize the game
        function initGame() {
            // Reset variables
            score = 0;
            gameOver = false;
            usedCards = [];
            currentCards = [];
            cardsToPlace = 2; // Start with two cards to place

            // Clear containers
            document.getElementById('source-container').innerHTML = '';
            document.getElementById('card-container').innerHTML = '';
            document.getElementById('message').textContent = '';
            document.getElementById('score').textContent = 'Score: ' + score;
            document.getElementById('restart-btn').style.display = 'none';
            document.getElementById('check-order-btn').style.display = 'inline-block';

            // Start the first round
            nextRound();
        }

        // Function to start the next round
        function nextRound() {
            if (usedCards.length === candidateCards.length) {
                // No more cards left
                gameOver = true;
                document.getElementById('message').textContent = 'Congratulations! You have placed all cards correctly!';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
                return;
            }

            // Determine the number of cards to place
            if (cardsToPlace === undefined) {
                cardsToPlace = 1; // After the first round, place one card per turn
            }

            // Randomly select 'cardsToPlace' cards that haven't been used
            var remainingCards = candidateCards.filter(function(card) {
                return usedCards.indexOf(card) === -1;
            });

            if (remainingCards.length < cardsToPlace) {
                cardsToPlace = remainingCards.length;
            }

            // Create cards and add them to the source-container
            var sourceContainer = document.getElementById('source-container');
            sourceContainer.innerHTML = ''; // Clear previous cards
            currentCards = []; // Reset current cards

            for (var i = 0; i < cardsToPlace; i++) {
                var randomIndex = Math.floor(Math.random() * remainingCards.length);
                var selectedCard = remainingCards.splice(randomIndex, 1)[0];
                usedCards.push(selectedCard);

                // Create the card element
                var cardDiv = document.createElement('div');
                cardDiv.className = 'card hidden-ef';
                cardDiv.setAttribute('emission_fa', selectedCard.ef);
                cardDiv.innerHTML = selectedCard.description + '<div class="emission-value">EF: ' + selectedCard.ef + '</div>';

                sourceContainer.appendChild(cardDiv);
                currentCards.push(selectedCard);
            }

            // Re-initialize the source sortable
            sourceSortable.destroy();
            sourceSortable = Sortable.create(sourceContainer, {
                group: {
                    name: 'cards',
                    put: false     // Do not allow items to be put into this list
                },
                sort: false,
                animation: 150,
                ghostClass: 'sortable-ghost',
                direction: 'horizontal'
            });

            // After the initial round, set cardsToPlace to 1
            if (cardsToPlace > 1) {
                cardsToPlace = 1;
            }
        }

        // Initialize SortableJS on the source container (empty initially)
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Function to check if the cards are in correct order
        function checkOrder() {
            var cards = document.querySelectorAll('#card-container .card');
            var isCorrect = true;
            var prevEF = -Infinity;

            for (var i = 0; i < cards.length; i++) {
                var ef = parseFloat(cards[i].getAttribute('emission_fa'));
                if (ef < prevEF) {
                    isCorrect = false;
                    break;
                }
                prevEF = ef;
            }

            // Reveal the ef values of the new cards
            var newCards = document.querySelectorAll('#card-container .card.hidden-ef');
            newCards.forEach(function(card) {
                card.classList.remove('hidden-ef');
            });

            var messageEl = document.getElementById('message');
            if (isCorrect) {
                score++;
                document.getElementById('score').textContent = 'Score: ' + score;
                messageEl.style.color = 'green';
                messageEl.textContent = 'Correct order!';
                // Proceed to next round after a short delay
                setTimeout(function() {
                    messageEl.textContent = '';
                    nextRound();
                }, 1000);
            } else {
                gameOver = true;
                messageEl.style.color = 'red';
                messageEl.textContent = 'Incorrect order. Game over! Your total score is ' + score + '.';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
            }
        }

        // Add event listener to the "Check Order" button
        var checkOrderBtn = document.getElementById('check-order-btn');
        checkOrderBtn.addEventListener('click', function() {
            // Ensure all new cards have been moved to the card-container
            var sourceCards = document.querySelectorAll('#source-container .card');
            if (sourceCards.length > 0) {
                alert('Please place all new cards into the sequence.');
                return;
            }
            checkOrder();
        });

        // Add event listener to the "Restart Game" button
        var restartBtn = document.getElementById('restart-btn');
        restartBtn.addEventListener('click', function() {
            initGame();
        });

        // Start the game
        initGame();
    </script>
</body>
</html>

Explanation of Modifications:

Starting with Two Cards to Place:

cardsToPlace Variable:

Added to track the number of cards to place in the current round.

Initialized to 2 in the initGame function.

javascript
var cardsToPlace; // Number of cards to place this round
function initGame() {
    // ...
    cardsToPlace = 2; // Start with two cards to place
    // ...
}

Modified nextRound Function:

Uses cardsToPlace to determine how many cards to add to the source-container.

After the first round, cardsToPlace is set to 1 for subsequent rounds.

javascript
function nextRound() {
    // ...
    if (cardsToPlace === undefined) {
        cardsToPlace = 1; // After the first round, place one card per turn
    }
    // ...
    // After the initial round, set cardsToPlace to 1
    if (cardsToPlace > 1) {
        cardsToPlace = 1;
    }
}

Dragging Cards Removes Them from Source-Container:

Changed sourceSortable Configuration:

Removed the pull: 'clone' option to prevent cloning.

Now, dragging a card moves it from the source-container to the card-container.

javascript
sourceSortable = Sortable.create(sourceContainer, {
    group: {
        name: 'cards',
        put: false     // Do not allow items to be put into this list
    },
    sort: false,
    // ...
});

Ensuring All New Cards Are Placed Before Checking:

Updated Event Listener for "Check Order" Button:

Checks if the source-container is empty before proceeding.

Alerts the player if not all new cards have been placed.

javascript
checkOrderBtn.addEventListener('click', function() {
    var sourceCards = document.querySelectorAll('#source-container .card');
    if (sourceCards.length > 0) {
        alert('Please place all new cards into the sequence.');
        return;
    }
    checkOrder();
});

Usage Instructions:

Starting the Game:
- Open the HTML file in a web browser.
- The game initializes with two cards in the source-container.
Placing Cards:
- Drag both cards from the source-container into the card-container in the order you believe is correct.
- The source-container will be empty after the cards are moved.
Checking the Order:
- Click the "Check Order" button.
- The emission_fa (EF) values of the new cards are revealed.
- The game checks if all cards in the card-container are in ascending order based on their EF values.
- If correct:
  - You gain a point.
  - The next round starts after a brief delay.
- If incorrect:
  - The game ends.
  - Your total score is displayed.
  - The "Restart Game" button appears.
Subsequent Rounds:
- Each new round presents one new card in the source-container.
- Repeat the process of placing the card and checking the order.
Restarting the Game:
- Click the "Restart Game" button to start over.

Game Objective:

Arrange the Cards Correctly:
- Your goal is to place the cards in the card-container in ascending order based on their hidden EF values.
- Use the descriptions and your knowledge to estimate where each card fits relative to the others.
Scoring:
- You earn one point for each correct placement.
- The game continues until you make an incorrect placement or all cards have been placed.

Enjoy the Game!

This game challenges your understanding of the emission factors associated with different technologies and activities.
It's both educational and engaging, helping you learn through interactive play.

Feel free to copy this code into an .html file and open it in a web browser to play the game.

Perfect, now let's add some flair and style to this game! * Modify the CSS to make this more interesting to look at (fun, but not over the top). * Mockup a title at the top of the game and a short instructions text. * Put the current score in the top right corner.

Certainly! Here is the complete HTML code for the game with your requested modifications:

CSS Enhancements: The styling has been updated to make the game more visually appealing while keeping it clean and not over the top.
Title and Instructions: A title and short instructions have been added at the top of the game.
Score Display: The current score is now displayed in the top right corner.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Emission Factor Ordering Game</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Overall page styling */
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f9f9f9;
            margin: 0;
            padding: 0;
        }

        /* Container for the game */
        .game-container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            position: relative;
        }

        /* Title styling */
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 10px;
        }

        /* Instructions styling */
        .instructions {
            text-align: center;
            color: #555;
            margin-bottom: 20px;
            font-size: 16px;
        }

        /* Score display */
        #score {
            position: fixed;
            top: 20px;
            right: 30px;
            font-size: 20px;
            color: #333;
        }

        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #e0e0e0;
            margin-bottom: 20px;
            border-radius: 10px;
        }

        /* Individual card styling */
        .card {
            width: 150px;
            height: 220px;
            margin: 0 10px;
            padding: 15px;
            background-color: #fff;
            border: 2px solid #ccc;
            border-radius: 10px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: space-between;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
            position: relative;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            transition: transform 0.2s;
        }

        .card:hover {
            transform: scale(1.05);
        }

        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }

        /* Message display */
        #message {
            font-family: Arial, sans-serif;
            font-size: 18px;
            margin-top: 20px;
            text-align: center;
        }

        /* Button styling */
        #check-order-btn, #restart-btn {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            margin-top: 10px;
            margin-right: 10px;
            background-color: #28a745;
            color: #fff;
            border: none;
            border-radius: 5px;
        }

        #check-order-btn:hover, #restart-btn:hover {
            background-color: #218838;
        }

        /* Display emission_fa value */
        .emission-value {
            font-size: 14px;
            color: #666;
            position: absolute;
            bottom: 10px;
        }

        /* Hide emission value */
        .hidden-ef .emission-value {
            display: none;
        }

        /* Adjustments for better layout */
        #controls {
            text-align: center;
        }
    </style>
</head>
<body>
    <!-- Score display -->
    <div id="score">Score: 0</div>

    <div class="game-container">
        <!-- Title -->
        <h1>Emission Factor Ordering Game</h1>

        <!-- Instructions -->
        <div class="instructions">
            Place the cards in order of increasing emission factor (EF).<br>
            Drag the cards from the deck to the sequence and arrange them correctly.
        </div>

        <!-- Source container for the new cards -->
        <div id="source-container" class="card-container">
            <!-- New cards will be added here -->
        </div>
        <!-- Container holding the player's cards -->
        <div id="card-container" class="card-container">
            <!-- Existing cards will be added here -->
        </div>

        <!-- Controls -->
        <div id="controls">
            <!-- Button to check the order -->
            <button id="check-order-btn">Check Order</button>
            <!-- Button to restart the game (hidden initially) -->
            <button id="restart-btn" style="display: none;">Restart Game</button>
        </div>

        <!-- Message display -->
        <div id="message"></div>
    </div>

    <!-- Include SortableJS and the game script -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <script>
        // Candidate cards list
        var candidateCards = [
            { description: "Solar Panels", ef: 10.2 },
            { description: "Electric Car", ef: 20.5 },
            { description: "Wind Turbine", ef: 15.0 },
            { description: "Coal Power Plant", ef: 90.0 },
            { description: "Bicycle", ef: 5.0 },
            { description: "Gasoline Car", ef: 70.3 },
            { description: "Hydroelectric Dam", ef: 25.0 },
            { description: "Nuclear Power Plant", ef: 30.0 },
            { description: "Public Transport", ef: 12.0 },
            { description: "Walking", ef: 0.0 }
        ];

        var score = 0;
        var gameOver = false;
        var usedCards = []; // Keep track of used cards
        var currentCards = []; // Cards currently in source-container
        var cardsToPlace; // Number of cards to place this round

        // Initialize the game
        function initGame() {
            // Reset variables
            score = 0;
            gameOver = false;
            usedCards = [];
            currentCards = [];
            cardsToPlace = 2; // Start with two cards to place

            // Clear containers
            document.getElementById('source-container').innerHTML = '';
            document.getElementById('card-container').innerHTML = '';
            document.getElementById('message').textContent = '';
            document.getElementById('score').textContent = 'Score: ' + score;
            document.getElementById('restart-btn').style.display = 'none';
            document.getElementById('check-order-btn').style.display = 'inline-block';

            // Start the first round
            nextRound();
        }

        // Function to start the next round
        function nextRound() {
            if (usedCards.length === candidateCards.length) {
                // No more cards left
                gameOver = true;
                document.getElementById('message').textContent = 'Congratulations! You have placed all cards correctly!';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
                return;
            }

            // Determine the number of cards to place
            if (cardsToPlace === undefined) {
                cardsToPlace = 1; // After the first round, place one card per turn
            }

            // Randomly select 'cardsToPlace' cards that haven't been used
            var remainingCards = candidateCards.filter(function(card) {
                return usedCards.indexOf(card) === -1;
            });

            if (remainingCards.length < cardsToPlace) {
                cardsToPlace = remainingCards.length;
            }

            // Create cards and add them to the source-container
            var sourceContainer = document.getElementById('source-container');
            sourceContainer.innerHTML = ''; // Clear previous cards
            currentCards = []; // Reset current cards

            for (var i = 0; i < cardsToPlace; i++) {
                var randomIndex = Math.floor(Math.random() * remainingCards.length);
                var selectedCard = remainingCards.splice(randomIndex, 1)[0];
                usedCards.push(selectedCard);

                // Create the card element
                var cardDiv = document.createElement('div');
                cardDiv.className = 'card hidden-ef';
                cardDiv.setAttribute('emission_fa', selectedCard.ef);
                cardDiv.innerHTML = '<div>' + selectedCard.description + '</div><div class="emission-value">EF: ' + selectedCard.ef + '</div>';

                sourceContainer.appendChild(cardDiv);
                currentCards.push(selectedCard);
            }

            // Re-initialize the source sortable
            sourceSortable.destroy();
            sourceSortable = Sortable.create(sourceContainer, {
                group: {
                    name: 'cards',
                    put: false     // Do not allow items to be put into this list
                },
                sort: false,
                animation: 150,
                ghostClass: 'sortable-ghost',
                direction: 'horizontal'
            });

            // After the initial round, set cardsToPlace to 1
            if (cardsToPlace > 1) {
                cardsToPlace = 1;
            }
        }

        // Initialize SortableJS on the source container (empty initially)
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Function to check if the cards are in correct order
        function checkOrder() {
            var cards = document.querySelectorAll('#card-container .card');
            var isCorrect = true;
            var prevEF = -Infinity;

            for (var i = 0; i < cards.length; i++) {
                var ef = parseFloat(cards[i].getAttribute('emission_fa'));
                if (ef < prevEF) {
                    isCorrect = false;
                    break;
                }
                prevEF = ef;
            }

            // Reveal the ef values of the new cards
            var newCards = document.querySelectorAll('#card-container .card.hidden-ef');
            newCards.forEach(function(card) {
                card.classList.remove('hidden-ef');
            });

            var messageEl = document.getElementById('message');
            if (isCorrect) {
                score++;
                document.getElementById('score').textContent = 'Score: ' + score;
                messageEl.style.color = 'green';
                messageEl.textContent = 'Correct order!';
                // Proceed to next round after a short delay
                setTimeout(function() {
                    messageEl.textContent = '';
                    nextRound();
                }, 1000);
            } else {
                gameOver = true;
                messageEl.style.color = 'red';
                messageEl.textContent = 'Incorrect order. Game over! Your total score is ' + score + '.';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
            }
        }

        // Add event listener to the "Check Order" button
        var checkOrderBtn = document.getElementById('check-order-btn');
        checkOrderBtn.addEventListener('click', function() {
            // Ensure all new cards have been moved to the card-container
            var sourceCards = document.querySelectorAll('#source-container .card');
            if (sourceCards.length > 0) {
                alert('Please place all new cards into the sequence.');
                return;
            }
            checkOrder();
        });

        // Add event listener to the "Restart Game" button
        var restartBtn = document.getElementById('restart-btn');
        restartBtn.addEventListener('click', function() {
            initGame();
        });

        // Start the game
        initGame();
    </script>
</body>
</html>

Explanation of Modifications:

CSS Enhancements:
- Body Styling:
  - Set a light background color (#f9f9f9) for a subtle, clean look.
  - Applied a modern sans-serif font for readability.
- Game Container:
  - Centered the game content using .game-container.
  - Added padding for spacing.
- Title and Instructions:
  - Centered and styled the title (<h1>) and instructions to make them stand out.
  - Used neutral colors to keep the design clean.
- Score Display:
  - Positioned the score at the top right corner using position: fixed.
  - Increased font size for visibility.
- Card Styling:
  - Enhanced cards with:
    - Rounded corners (border-radius).
    - Box shadows for depth.
    - Hover effect to slightly enlarge the card (transform: scale(1.05)).
    - Smooth transition on hover.
  - Adjusted padding and margins for better spacing.
- Buttons:
  - Styled the buttons with a green background and white text to make them prominent.
  - Added hover effects to change the background color slightly when the user hovers over them.
HTML Structure Changes:
- Added Title and Instructions:
  - Included a <h1> tag for the game title.
  - Provided a <div class="instructions"> with a brief explanation of the game.
- Moved Score Display:
  - Placed the <div id="score"> at the top of the body to position it in the top right corner.
- Wrapped Game Content:
  - Enclosed all game elements within a <div class="game-container"> for centralized styling.
- Adjusted Controls and Message:
  - Wrapped the buttons within a <div id="controls"> for better layout management.
  - Moved the message display inside the .game-container for consistent styling.
JavaScript Adjustments:
- Score Display Update:
  - Ensured the score is updated in the new position by referencing document.getElementById('score') appropriately.

Usage Instructions:

Save the Code:
- Copy the provided code into a file with an .html extension (e.g., emission_game.html).
Open in Browser:
- Open the HTML file in a modern web browser like Chrome or Firefox.
Play the Game:
- Read the instructions at the top.
- Start by dragging the two initial cards from the deck (top container) into the sequence (bottom container).
- Arrange the cards in what you believe is the correct order based on their descriptions.
- Click "Check Order" to see if you've placed them correctly.
- Continue playing, placing one new card per round, until the game ends.
Restarting:
- If the game ends, click "Restart Game" to play again.

Enjoy the Enhanced Game!

The game now has an improved visual design, making it more engaging and user-friendly. The title and instructions provide context, and the score display keeps you informed of your progress.

Feel free to further customize the styling or content to suit your preferences.

Perfect! Some more small modifications: * The source-container collapses when there's no card in it. Is it possible to have it stay the same height, independent of if it contains a card, or not. * The page could be a bit wider, right now it can only contain 5-6 cards before it overflows. * Format the displayed ef value like this: 3.12 kg CO2e / KG . * When the result is revealed, after pressing the "Check Order" button, make the reveal of the ef value more noticeable, maybe by a flashing animation, or similar, and by adding a ✅ emoji under it if it's correct, and a ❌ emoji under it, if it was wrong.

Certainly! Below is the complete HTML code for the game with your requested modifications:

Modifications Implemented:
1. Persistent Source Container Height: The source-container now maintains its height even when empty.
2. Increased Page Width: The game container width has been increased to accommodate more cards before overflowing.
3. Formatted EF Values: The emission factor (EF) values are now displayed in the format "X.XX kg CO₂e / KG".
4. Enhanced EF Reveal: When EF values are revealed after checking the order, they flash briefly, and a ✅ or ❌ emoji is displayed beneath each new card based on the correctness of the order.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Emission Factor Ordering Game</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Overall page styling */
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f9f9f9;
            margin: 0;
            padding: 0;
        }

        /* Container for the game */
        .game-container {
            max-width: 1200px; /* Increased width */
            margin: 0 auto;
            padding: 20px;
            position: relative;
        }

        /* Title styling */
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 10px;
        }

        /* Instructions styling */
        .instructions {
            text-align: center;
            color: #555;
            margin-bottom: 20px;
            font-size: 16px;
        }

        /* Score display */
        #score {
            position: fixed;
            top: 20px;
            right: 30px;
            font-size: 20px;
            color: #333;
        }

        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #e0e0e0;
            margin-bottom: 20px;
            border-radius: 10px;
            min-height: 250px; /* Maintains height when empty */
        }

        /* Individual card styling */
        .card {
            width: 150px;
            height: 220px;
            margin: 0 10px;
            padding: 15px;
            background-color: #fff;
            border: 2px solid #ccc;
            border-radius: 10px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: space-between;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
            position: relative;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            transition: transform 0.2s;
        }

        .card:hover {
            transform: scale(1.05);
        }

        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }

        /* Message display */
        #message {
            font-family: Arial, sans-serif;
            font-size: 18px;
            margin-top: 20px;
            text-align: center;
        }

        /* Button styling */
        #check-order-btn, #restart-btn {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            margin-top: 10px;
            margin-right: 10px;
            background-color: #28a745;
            color: #fff;
            border: none;
            border-radius: 5px;
        }

        #check-order-btn:hover, #restart-btn:hover {
            background-color: #218838;
        }

        /* Display emission_fa value */
        .emission-value {
            font-size: 14px;
            color: #666;
            position: absolute;
            bottom: 40px;
        }

        /* Hide emission value */
        .hidden-ef .emission-value {
            display: none;
        }

        /* Adjustments for better layout */
        #controls {
            text-align: center;
        }

        /* Flash animation for EF reveal */
        @keyframes flash {
            0% { background-color: #fff; }
            50% { background-color: #ffff99; }
            100% { background-color: #fff; }
        }

        .flash-ef {
            animation: flash 1s ease-in-out;
        }

        /* Emoji styling */
        .result-emoji {
            font-size: 24px;
            position: absolute;
            bottom: 10px;
        }
    </style>
</head>
<body>
    <!-- Score display -->
    <div id="score">Score: 0</div>

    <div class="game-container">
        <!-- Title -->
        <h1>Emission Factor Ordering Game</h1>

        <!-- Instructions -->
        <div class="instructions">
            Place the cards in order of increasing emission factor (EF).<br>
            Drag the cards from the deck to the sequence and arrange them correctly.
        </div>

        <!-- Source container for the new cards -->
        <div id="source-container" class="card-container">
            <!-- New cards will be added here -->
        </div>
        <!-- Container holding the player's cards -->
        <div id="card-container" class="card-container">
            <!-- Existing cards will be added here -->
        </div>

        <!-- Controls -->
        <div id="controls">
            <!-- Button to check the order -->
            <button id="check-order-btn">Check Order</button>
            <!-- Button to restart the game (hidden initially) -->
            <button id="restart-btn" style="display: none;">Restart Game</button>
        </div>

        <!-- Message display -->
        <div id="message"></div>
    </div>

    <!-- Include SortableJS and the game script -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <script>
        // Candidate cards list
        var candidateCards = [
            { description: "Solar Panels", ef: 10.2 },
            { description: "Electric Car", ef: 20.5 },
            { description: "Wind Turbine", ef: 15.0 },
            { description: "Coal Power Plant", ef: 90.0 },
            { description: "Bicycle", ef: 5.0 },
            { description: "Gasoline Car", ef: 70.3 },
            { description: "Hydroelectric Dam", ef: 25.0 },
            { description: "Nuclear Power Plant", ef: 30.0 },
            { description: "Public Transport", ef: 12.0 },
            { description: "Walking", ef: 0.0 }
        ];

        var score = 0;
        var gameOver = false;
        var usedCards = []; // Keep track of used cards
        var currentCards = []; // Cards currently in source-container
        var cardsToPlace; // Number of cards to place this round

        // Initialize the game
        function initGame() {
            // Reset variables
            score = 0;
            gameOver = false;
            usedCards = [];
            currentCards = [];
            cardsToPlace = 2; // Start with two cards to place

            // Clear containers
            document.getElementById('source-container').innerHTML = '';
            document.getElementById('card-container').innerHTML = '';
            document.getElementById('message').textContent = '';
            document.getElementById('score').textContent = 'Score: ' + score;
            document.getElementById('restart-btn').style.display = 'none';
            document.getElementById('check-order-btn').style.display = 'inline-block';

            // Start the first round
            nextRound();
        }

        // Function to start the next round
        function nextRound() {
            if (usedCards.length === candidateCards.length) {
                // No more cards left
                gameOver = true;
                document.getElementById('message').textContent = 'Congratulations! You have placed all cards correctly!';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
                return;
            }

            // Determine the number of cards to place
            if (cardsToPlace === undefined) {
                cardsToPlace = 1; // After the first round, place one card per turn
            }

            // Randomly select 'cardsToPlace' cards that haven't been used
            var remainingCards = candidateCards.filter(function(card) {
                return usedCards.indexOf(card) === -1;
            });

            if (remainingCards.length < cardsToPlace) {
                cardsToPlace = remainingCards.length;
            }

            // Create cards and add them to the source-container
            var sourceContainer = document.getElementById('source-container');
            sourceContainer.innerHTML = ''; // Clear previous cards
            currentCards = []; // Reset current cards

            for (var i = 0; i < cardsToPlace; i++) {
                var randomIndex = Math.floor(Math.random() * remainingCards.length);
                var selectedCard = remainingCards.splice(randomIndex, 1)[0];
                usedCards.push(selectedCard);

                // Create the card element
                var cardDiv = document.createElement('div');
                cardDiv.className = 'card hidden-ef';
                cardDiv.setAttribute('emission_fa', selectedCard.ef);
                cardDiv.innerHTML = '<div>' + selectedCard.description + '</div><div class="emission-value">' + selectedCard.ef.toFixed(2) + ' kg CO₂e / KG</div>';

                sourceContainer.appendChild(cardDiv);
                currentCards.push(selectedCard);
            }

            // Re-initialize the source sortable
            sourceSortable.destroy();
            sourceSortable = Sortable.create(sourceContainer, {
                group: {
                    name: 'cards',
                    put: false     // Do not allow items to be put into this list
                },
                sort: false,
                animation: 150,
                ghostClass: 'sortable-ghost',
                direction: 'horizontal'
            });

            // After the initial round, set cardsToPlace to 1
            if (cardsToPlace > 1) {
                cardsToPlace = 1;
            }
        }

        // Initialize SortableJS on the source container (empty initially)
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Function to check if the cards are in correct order
        function checkOrder() {
            var cards = document.querySelectorAll('#card-container .card');
            var isCorrect = true;
            var prevEF = -Infinity;

            for (var i = 0; i < cards.length; i++) {
                var ef = parseFloat(cards[i].getAttribute('emission_fa'));
                if (ef < prevEF) {
                    isCorrect = false;
                    break;
                }
                prevEF = ef;
            }

            // Reveal the ef values of the new cards
            var newCards = document.querySelectorAll('#card-container .card.hidden-ef');
            newCards.forEach(function(card) {
                card.classList.remove('hidden-ef');
                card.classList.add('flash-ef');
            });

            // Add emoji under the EF value
            var emoji = isCorrect ? '✅' : '❌';
            newCards.forEach(function(card) {
                var emojiDiv = document.createElement('div');
                emojiDiv.className = 'result-emoji';
                emojiDiv.textContent = emoji;
                card.appendChild(emojiDiv);
            });

            var messageEl = document.getElementById('message');
            if (isCorrect) {
                score++;
                document.getElementById('score').textContent = 'Score: ' + score;
                messageEl.style.color = 'green';
                messageEl.textContent = 'Correct order!';
                // Proceed to next round after a short delay
                setTimeout(function() {
                    messageEl.textContent = '';
                    nextRound();
                }, 1000);
            } else {
                gameOver = true;
                messageEl.style.color = 'red';
                messageEl.textContent = 'Incorrect order. Game over! Your total score is ' + score + '.';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
            }
        }

        // Add event listener to the "Check Order" button
        var checkOrderBtn = document.getElementById('check-order-btn');
        checkOrderBtn.addEventListener('click', function() {
            // Ensure all new cards have been moved to the card-container
            var sourceCards = document.querySelectorAll('#source-container .card');
            if (sourceCards.length > 0) {
                alert('Please place all new cards into the sequence.');
                return;
            }
            checkOrder();
        });

        // Add event listener to the "Restart Game" button
        var restartBtn = document.getElementById('restart-btn');
        restartBtn.addEventListener('click', function() {
            initGame();
        });

        // Start the game
        initGame();
    </script>
</body>
</html>

Explanation of Modifications:

Persistent Source Container Height:
- CSS Adjustment:
```
css
.card-container {
    /* ...existing styles... */
    min-height: 250px; /* Maintains height when empty */
}
```
  - Added min-height: 250px to the .card-container class to ensure that both containers maintain their height even when empty.
Increased Page Width:
- CSS Adjustment:
```
css
.game-container {
    max-width: 1200px; /* Increased width */
    /* ...existing styles... */
}
```
  - Increased max-width to 1200px in the .game-container class to allow more cards to fit before overflowing.

Formatted EF Values:

JavaScript Update:

javascript
cardDiv.innerHTML = '<div>' + selectedCard.description + '</div><div class="emission-value">' + selectedCard.ef.toFixed(2) + ' kg CO₂e / KG</div>';

Updated the innerHTML of each card to format the EF value as "X.XX kg CO₂e / KG" using toFixed(2) for two decimal places.

Enhanced EF Reveal:

CSS Additions:

css
/* Flash animation for EF reveal */
@keyframes flash {
    0% { background-color: #fff; }
    50% { background-color: #ffff99; }
    100% { background-color: #fff; }
}

.flash-ef {
    animation: flash 1s ease-in-out;
}

/* Emoji styling */
.result-emoji {
    font-size: 24px;
    position: absolute;
    bottom: 10px;
}

Defined a flash keyframe animation and a .flash-ef class to animate the background color when EF values are revealed.
Created a .result-emoji class to style the ✅ or ❌ emoji displayed under the EF value.

JavaScript Update:

javascript
// Reveal the ef values of the new cards
var newCards = document.querySelectorAll('#card-container .card.hidden-ef');
newCards.forEach(function(card) {
    card.classList.remove('hidden-ef');
    card.classList.add('flash-ef');
});

// Add emoji under the EF value
var emoji = isCorrect ? '✅' : '❌';
newCards.forEach(function(card) {
    var emojiDiv = document.createElement('div');
    emojiDiv.className = 'result-emoji';
    emojiDiv.textContent = emoji;
    card.appendChild(emojiDiv);
});

After checking the order, the EF values of the new cards are revealed with a flash animation.
A ✅ emoji is added under each new card if the order is correct, or a ❌ if incorrect.

Usage Instructions:

Save the Code:
- Copy the provided code into a file with an .html extension (e.g., emission_game.html).
Open in Browser:
- Open the HTML file in a modern web browser like Chrome or Firefox.
Play the Game:
- Read the instructions at the top.
- Start by dragging the two initial cards from the deck (top container) into the sequence (bottom container).
- Arrange the cards in what you believe is the correct order based on their descriptions.
- Click "Check Order" to see if you've placed them correctly.
  - The EF values will flash into view with an animation.
  - A ✅ or ❌ emoji will appear under each new card based on the correctness.
- Continue playing, placing one new card per round, until the game ends.
Restarting:
- If the game ends, click "Restart Game" to play again.

Enjoy the Enhanced Game!

Feel free to customize the styling or game content further to suit your preferences.

Split flash-ef into two: flash-ef-correct that flashes green and flash-ef-wrong that flashes red.

Certainly! Below is the complete updated HTML code incorporating your requested modifications:

Split flash-ef into two classes:
- flash-ef-correct: Flashes green to indicate a correct order.
- flash-ef-wrong: Flashes red to indicate an incorrect order.
JavaScript Update:
- The code now applies the appropriate class (flash-ef-correct or flash-ef-wrong) to the cards based on whether the order is correct.

html
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Emission Factor Ordering Game</title>
    <!-- Include SortableJS from CDN -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <style>
        /* Overall page styling */
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f9f9f9;
            margin: 0;
            padding: 0;
        }

        /* Container for the game */
        .game-container {
            max-width: 1200px; /* Increased width */
            margin: 0 auto;
            padding: 20px;
            position: relative;
        }

        /* Title styling */
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 10px;
        }

        /* Instructions styling */
        .instructions {
            text-align: center;
            color: #555;
            margin-bottom: 20px;
            font-size: 16px;
        }

        /* Score display */
        #score {
            position: fixed;
            top: 20px;
            right: 30px;
            font-size: 20px;
            color: #333;
        }

        /* Common styles for card containers */
        .card-container {
            display: flex;
            flex-direction: row;
            align-items: flex-start;
            overflow-x: auto;
            padding: 10px;
            background-color: #e0e0e0;
            margin-bottom: 20px;
            border-radius: 10px;
            min-height: 250px; /* Maintains height when empty */
        }

        /* Individual card styling */
        .card {
            width: 150px;
            height: 220px;
            margin: 0 10px;
            padding: 15px;
            background-color: #fff;
            border: 2px solid #ccc;
            border-radius: 10px;
            box-sizing: border-box;
            cursor: move;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: space-between;
            text-align: center;
            font-family: Arial, sans-serif;
            font-size: 16px;
            position: relative;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            transition: transform 0.2s;
        }

        .card:hover {
            transform: scale(1.05);
        }

        /* Style for the ghost element while dragging */
        .sortable-ghost {
            opacity: 0.4;
        }

        /* Message display */
        #message {
            font-family: Arial, sans-serif;
            font-size: 18px;
            margin-top: 20px;
            text-align: center;
        }

        /* Button styling */
        #check-order-btn, #restart-btn {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            margin-top: 10px;
            margin-right: 10px;
            background-color: #28a745;
            color: #fff;
            border: none;
            border-radius: 5px;
        }

        #check-order-btn:hover, #restart-btn:hover {
            background-color: #218838;
        }

        /* Display emission_fa value */
        .emission-value {
            font-size: 14px;
            color: #666;
            position: absolute;
            bottom: 40px;
        }

        /* Hide emission value */
        .hidden-ef .emission-value {
            display: none;
        }

        /* Adjustments for better layout */
        #controls {
            text-align: center;
        }

        /* Flash animation for EF reveal - Correct */
        @keyframes flash-green {
            0% { background-color: #fff; }
            50% { background-color: #d4edda; }
            100% { background-color: #fff; }
        }

        .flash-ef-correct {
            animation: flash-green 1s ease-in-out;
        }

        /* Flash animation for EF reveal - Wrong */
        @keyframes flash-red {
            0% { background-color: #fff; }
            50% { background-color: #f8d7da; }
            100% { background-color: #fff; }
        }

        .flash-ef-wrong {
            animation: flash-red 1s ease-in-out;
        }

        /* Emoji styling */
        .result-emoji {
            font-size: 24px;
            position: absolute;
            bottom: 10px;
        }
    </style>
</head>
<body>
    <!-- Score display -->
    <div id="score">Score: 0</div>

    <div class="game-container">
        <!-- Title -->
        <h1>Emission Factor Ordering Game</h1>

        <!-- Instructions -->
        <div class="instructions">
            Place the cards in order of increasing emission factor (EF).<br>
            Drag the cards from the deck to the sequence and arrange them correctly.
        </div>

        <!-- Source container for the new cards -->
        <div id="source-container" class="card-container">
            <!-- New cards will be added here -->
        </div>
        <!-- Container holding the player's cards -->
        <div id="card-container" class="card-container">
            <!-- Existing cards will be added here -->
        </div>

        <!-- Controls -->
        <div id="controls">
            <!-- Button to check the order -->
            <button id="check-order-btn">Check Order</button>
            <!-- Button to restart the game (hidden initially) -->
            <button id="restart-btn" style="display: none;">Restart Game</button>
        </div>

        <!-- Message display -->
        <div id="message"></div>
    </div>

    <!-- Include SortableJS and the game script -->
    <script src="https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js"></script>
    <script>
        // Candidate cards list
        var candidateCards = [
            { description: "Solar Panels", ef: 10.2 },
            { description: "Electric Car", ef: 20.5 },
            { description: "Wind Turbine", ef: 15.0 },
            { description: "Coal Power Plant", ef: 90.0 },
            { description: "Bicycle", ef: 5.0 },
            { description: "Gasoline Car", ef: 70.3 },
            { description: "Hydroelectric Dam", ef: 25.0 },
            { description: "Nuclear Power Plant", ef: 30.0 },
            { description: "Public Transport", ef: 12.0 },
            { description: "Walking", ef: 0.0 }
        ];

        var score = 0;
        var gameOver = false;
        var usedCards = []; // Keep track of used cards
        var currentCards = []; // Cards currently in source-container
        var cardsToPlace; // Number of cards to place this round

        // Initialize the game
        function initGame() {
            // Reset variables
            score = 0;
            gameOver = false;
            usedCards = [];
            currentCards = [];
            cardsToPlace = 2; // Start with two cards to place

            // Clear containers
            document.getElementById('source-container').innerHTML = '';
            document.getElementById('card-container').innerHTML = '';
            document.getElementById('message').textContent = '';
            document.getElementById('score').textContent = 'Score: ' + score;
            document.getElementById('restart-btn').style.display = 'none';
            document.getElementById('check-order-btn').style.display = 'inline-block';

            // Start the first round
            nextRound();
        }

        // Function to start the next round
        function nextRound() {
            if (usedCards.length === candidateCards.length) {
                // No more cards left
                gameOver = true;
                document.getElementById('message').textContent = 'Congratulations! You have placed all cards correctly!';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
                return;
            }

            // Determine the number of cards to place
            if (cardsToPlace === undefined) {
                cardsToPlace = 1; // After the first round, place one card per turn
            }

            // Randomly select 'cardsToPlace' cards that haven't been used
            var remainingCards = candidateCards.filter(function(card) {
                return usedCards.indexOf(card) === -1;
            });

            if (remainingCards.length < cardsToPlace) {
                cardsToPlace = remainingCards.length;
            }

            // Create cards and add them to the source-container
            var sourceContainer = document.getElementById('source-container');
            sourceContainer.innerHTML = ''; // Clear previous cards
            currentCards = []; // Reset current cards

            for (var i = 0; i < cardsToPlace; i++) {
                var randomIndex = Math.floor(Math.random() * remainingCards.length);
                var selectedCard = remainingCards.splice(randomIndex, 1)[0];
                usedCards.push(selectedCard);

                // Create the card element
                var cardDiv = document.createElement('div');
                cardDiv.className = 'card hidden-ef';
                cardDiv.setAttribute('emission_fa', selectedCard.ef);
                cardDiv.innerHTML = '<div>' + selectedCard.description + '</div><div class="emission-value">' + selectedCard.ef.toFixed(2) + ' kg CO₂e / KG</div>';

                sourceContainer.appendChild(cardDiv);
                currentCards.push(selectedCard);
            }

            // Re-initialize the source sortable
            sourceSortable.destroy();
            sourceSortable = Sortable.create(sourceContainer, {
                group: {
                    name: 'cards',
                    put: false     // Do not allow items to be put into this list
                },
                sort: false,
                animation: 150,
                ghostClass: 'sortable-ghost',
                direction: 'horizontal'
            });

            // After the initial round, set cardsToPlace to 1
            if (cardsToPlace > 1) {
                cardsToPlace = 1;
            }
        }

        // Initialize SortableJS on the source container (empty initially)
        var sourceEl = document.getElementById('source-container');
        var sourceSortable = Sortable.create(sourceEl, {
            group: {
                name: 'cards',
                put: false     // Do not allow items to be put into this list
            },
            sort: false,       // Disable sorting within this list
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Initialize SortableJS on the card container
        var cardEl = document.getElementById('card-container');
        var cardSortable = Sortable.create(cardEl, {
            group: {
                name: 'cards',
                pull: false, // Do not allow items to be pulled from this list into other lists
                put: true    // Allow items to be put into this list
            },
            animation: 150,
            ghostClass: 'sortable-ghost',
            direction: 'horizontal'
        });

        // Function to check if the cards are in correct order
        function checkOrder() {
            var cards = document.querySelectorAll('#card-container .card');
            var isCorrect = true;
            var prevEF = -Infinity;

            for (var i = 0; i < cards.length; i++) {
                var ef = parseFloat(cards[i].getAttribute('emission_fa'));
                if (ef < prevEF) {
                    isCorrect = false;
                    break;
                }
                prevEF = ef;
            }

            // Reveal the ef values of the new cards
            var newCards = document.querySelectorAll('#card-container .card.hidden-ef');
            newCards.forEach(function(card) {
                card.classList.remove('hidden-ef');
                if (isCorrect) {
                    card.classList.add('flash-ef-correct');
                } else {
                    card.classList.add('flash-ef-wrong');
                }
            });

            // Add emoji under the EF value
            var emoji = isCorrect ? '✅' : '❌';
            newCards.forEach(function(card) {
                var emojiDiv = document.createElement('div');
                emojiDiv.className = 'result-emoji';
                emojiDiv.textContent = emoji;
                card.appendChild(emojiDiv);
            });

            var messageEl = document.getElementById('message');
            if (isCorrect) {
                score++;
                document.getElementById('score').textContent = 'Score: ' + score;
                messageEl.style.color = 'green';
                messageEl.textContent = 'Correct order!';
                // Proceed to next round after a short delay
                setTimeout(function() {
                    messageEl.textContent = '';
                    nextRound();
                }, 1000);
            } else {
                gameOver = true;
                messageEl.style.color = 'red';
                messageEl.textContent = 'Incorrect order. Game over! Your total score is ' + score + '.';
                document.getElementById('check-order-btn').style.display = 'none';
                document.getElementById('restart-btn').style.display = 'inline-block';
            }
        }

        // Add event listener to the "Check Order" button
        var checkOrderBtn = document.getElementById('check-order-btn');
        checkOrderBtn.addEventListener('click', function() {
            // Ensure all new cards have been moved to the card-container
            var sourceCards = document.querySelectorAll('#source-container .card');
            if (sourceCards.length > 0) {
                alert('Please place all new cards into the sequence.');
                return;
            }
            checkOrder();
        });

        // Add event listener to the "Restart Game" button
        var restartBtn = document.getElementById('restart-btn');
        restartBtn.addEventListener('click', function() {
            initGame();
        });

        // Start the game
        initGame();
    </script>
</body>
</html>

Explanation of Modifications:

Split flash-ef into flash-ef-correct and flash-ef-wrong:

CSS Adjustments:

Removed the original flash-ef class.

Created two new keyframe animations and classes:

css
/* Flash animation for EF reveal - Correct */
@keyframes flash-green {
    0% { background-color: #fff; }
    50% { background-color: #d4edda; } /* Light green */
    100% { background-color: #fff; }
}

.flash-ef-correct {
    animation: flash-green 1s ease-in-out;
}

/* Flash animation for EF reveal - Wrong */
@keyframes flash-red {
    0% { background-color: #fff; }
    50% { background-color: #f8d7da; } /* Light red */
    100% { background-color: #fff; }
}

.flash-ef-wrong {
    animation: flash-red 1s ease-in-out;
}

The colors #d4edda and #f8d7da are light green and light red, respectively, to create a subtle flash effect.

JavaScript Updates:
- Apply Appropriate Class Based on Correctness:
```
javascript
newCards.forEach(function(card) {
    card.classList.remove('hidden-ef');
    if (isCorrect) {
        card.classList.add('flash-ef-correct');
    } else {
        card.classList.add('flash-ef-wrong');
    }
});
```
  - After revealing the EF values, the code checks if the order is correct.
  - If isCorrect is true, it adds the flash-ef-correct class to each new card.
  - If isCorrect is false, it adds the flash-ef-wrong class.
- Consistency in Applying Classes:
  - Ensures that all new cards flash with the appropriate color, providing immediate visual feedback to the player.
Usage of Correct Colors for Feedback:
- Green Flash for Correct Order:
  - Green is commonly associated with correctness and success.
  - The light green flash provides a positive visual cue.
- Red Flash for Incorrect Order:
  - Red is associated with errors or warnings.
  - The light red flash indicates an incorrect placement.

Usage Instructions:

Save the Code:
- Copy the provided code into a file with an .html extension (e.g., emission_game.html).
Open in Browser:
- Open the HTML file in a modern web browser like Chrome or Firefox.
Play the Game:
- Read the instructions at the top.
- Start by dragging the two initial cards from the deck (top container) into the sequence (bottom container).
- Arrange the cards in what you believe is the correct order based on their descriptions.
- Click "Check Order" to see if you've placed them correctly.
  - The EF values will be revealed with a flashing animation.
    - If correct: Cards will flash green.
    - If incorrect: Cards will flash red.
  - A ✅ or ❌ emoji will appear under each new card based on the correctness.
- Continue playing, placing one new card per round, until the game ends.
Restarting:
- If the game ends, click "Restart Game" to play again.

Enjoy the Enhanced Game!

This modification adds clearer visual feedback, helping players quickly understand whether their placement was correct or not. The green and red flashes, along with the emojis, make the game more interactive and engaging.

Feel free to further customize the styling or content to suit your preferences.

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