Modal / 10 アニメーション｜Animated

<!-- モーダルを開くボタン -->
<button class="modal-button">Animated Modal</button>

<!-- モーダルの背景マスク -->
<div class="mask"></div>

<!-- モーダル本体 -->
<div class="modal">
  <div class="modal-content">
    <p>【Animated Modal】</p>
    <p>3D回転しながら現れる、動きのあるモーダルウィンドウです。</p>
    <div class="close-btn-container">
      <button class="close-btn">CLOSE</button>
    </div>
  </div>
</div>

/* 開くボタンのスタイル */
.modal-button {
  padding: 15px 30px;
  background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.4s ease;
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
  position: relative;
  overflow: hidden;
}

.modal-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.modal-button:hover::before {
  left: 100%;
}

.modal-button:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
}

/* 背景マスクのスタイル */
.mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
  backdrop-filter: blur(8px);
}

.mask.appear {
  opacity: 1;
  visibility: visible;
}

/* モーダル本体のスタイル */
.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8) rotateY(90deg);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 40px;
  border-radius: 20px;
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.modal.appear {
  opacity: 1;
  visibility: visible;
  /* 3D回転アニメーションで表示 */
  transform: translate(-50%, -50%) scale(1) rotateY(0deg);
}

.modal p {
  color: #fff;
  line-height: 1.7;
  margin-bottom: 30px;
  font-size: 16px;
  text-align: center;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* 閉じるボタンのスタイル */
.close-btn {
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 25px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: block;
  margin: 0 auto;
  backdrop-filter: blur(10px);
}

.close-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

(function () {
  var btn = document.querySelector('.modal-button');
  var mask = document.querySelector('.mask');
  var modal = document.querySelector('.modal');
  var closeBtns = document.querySelectorAll('.close-btn');

  if (!btn || !mask || !modal) return;

  function openModal() {
    mask.classList.add('appear');
    modal.classList.add('appear');
    // JSでアニメーションを強制リフローさせて確実に発火させる場合
    setTimeout(function() {
      modal.style.transform = 'translate(-50%, -50%) scale(1) rotateY(0deg)';
    }, 50);
  }

  function closeModal() {
    mask.classList.remove('appear');
    modal.classList.remove('appear');
    modal.style.transform = 'translate(-50%, -50%) scale(0.8) rotateY(90deg)';
  }

  btn.addEventListener('click', openModal);
  mask.addEventListener('click', closeModal);
  closeBtns.forEach(function(b) { b.addEventListener('click', closeModal); });

  document.addEventListener('keydown', function (e) {
    if (e.key === 'Escape' && modal.classList.contains('appear')) {
      closeModal();
    }
  });
})();