<div class="demo-info">
  <h2>Fanned Card Deck</h2>
  <p>Each card's <code>transform</code> is calculated based on its index relative to the center of the stack. Uses <code>calc()</code> with <code>sibling-index()</code> and <code>sibling-count()</code>.</p>
  <div class="controls">
    <button id="add-item">Deal one! 🤚</button>
    <button id="remove-item">Burn one! 🔥</button>
  </div>
</div>
<div class="hand">
  <div class="card"></div>
  <div class="card"></div>
  <div class="card"></div>
  <div class="card"></div>
  <div class="card"></div>
</div>

:root {
  --card-width: min(30vw, 200px);
  --card-height: min(42vw, 280px);
}

.hand {
  position: relative;
  width: var(--card-width);
  height: var(--card-height);
  margin-inline: auto;
}

.card {
  --rotation-per-card: 8deg;
  --center-index: calc((sibling-count() + 1) / 2);

  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  border: 3px solid white;
  transform: rotate(
      calc(var(--rotation-per-card) * (sibling-index() - var(--center-index)))
    )
    translateY(calc(4px * (sibling-index() - 1)));
  transform-origin: bottom center;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  background-image: repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 15px,
      #f7b267 15px,
      #f7b267 50%
    ),
    repeating-linear-gradient(
      45deg,
      #f25c54,
      #f25c54 15px,
      #f79d65 15px,
      #f79d65 50%
    );
  background-size: 30px 30px, 22px 22px;
}

.hand:hover .card {
  transform: rotate(
      calc(var(--rotation-per-card) * (sibling-index() - var(--center-index)))
    )
    translateY(calc(-5px * abs(sibling-index() - var(--center-index))));
}

.card--added {
  animation: deal-in 0.5s cubic-bezier(0.2, 1, 0.4, 1);
}

.card--removing {
  animation: deal-out 0.2s linear;
}

@keyframes deal-in {
  from {
    opacity: 0;
    transform: translateY(100px) rotate(0deg);
  }
}

@keyframes deal-out {
  to {
    opacity: 0;
    transform: translateY(-100px) rotate(-5deg);
  }
}

@layer basestyles {
  :root {
    --casino-green-dark: #1d3a2d;
    --casino-green-light: #3a7559;
    --text-color-light: #f0f0f0;
    --button-red: #a31f1f;
    --button-gold: #daa520;
  }

  body {
    font-family: "Poppins", sans-serif;
    background-color: var(--casino-green-dark);
    background-image: radial-gradient(
      circle,
      var(--casino-green-light) 0%,
      var(--casino-green-dark) 100%
    );
    color: var(--text-color-light);
    margin: 0;
    padding: 3rem 1rem;
    display: grid;
    gap: 3.5rem;
    justify-items: center;
    min-height: 100vh;
    box-sizing: border-box;
  }

  .demo-info {
    max-width: 650px;
    text-align: center;
  }

  .demo-container h2 {
    margin-bottom: 0.5rem;
  }

  p code {
    background-color: rgba(0, 0, 0, 0.3);
    color: #ffd700;
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .controls {
    margin-top: 2rem;
  }

  button {
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    background-color: var(--button-red);
    border: 2px solid var(--button-gold);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease,
      background-color 0.2s ease;
    margin: 0 0.5rem 1.5rem;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
    &:hover {
      transform: translateY(-3px);
      box-shadow: 0 6px 12px rgba(0, 0, 0, 0.5);
      background-color: #c62828; /* Slightly brighter red on hover */
    }
    &:active {
      transform: translateY(-1px);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
    }
  }
}

const hand = document.querySelector(".hand");
const addItem = document.getElementById("add-item");
const removeItem = document.getElementById("remove-item");

addItem.addEventListener("click", () => {
  if (hand.children.length < 53) {
    const newCard = document.createElement("div");
    newCard.classList.add("card");
    newCard.classList.add("card--added");
    newCard.addEventListener(
      "animationend",
      () => {
        newCard.classList.remove("card--added");
      },
      { once: true }
    );

    hand.appendChild(newCard);
  }
});

removeItem.addEventListener("click", () => {
  const cardToRemove = hand.lastElementChild;
  cardToRemove.classList.add("card--removing");
  cardToRemove.addEventListener(
    "animationend",
    () => {
      cardToRemove.remove();
    },
    { once: true }
  );
});