Modal / 08 3D｜3D

<!-- モーダルを開くボタン -->
<button class="modal-button">3D 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>【3D Modal】</p>
    <p>奥行きのある3Dエフェクトの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(145deg, #ffffff, #e6e6e6);
  color: #333;
  border: none;
  border-radius: 20px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 
    0 8px 16px rgba(0, 0, 0, 0.1),
    0 4px 8px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transform-style: preserve-3d;
  position: relative;
}

.modal-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(145deg, #f0f0f0, #ffffff);
  border-radius: 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.modal-button:hover {
  transform: perspective(1000px) rotateX(-2deg) translateY(-2px);
  box-shadow: 
    0 15px 30px rgba(0, 0, 0, 0.15),
    0 8px 16px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  color: #2196f3;
}

.modal-button:active {
  transform: perspective(1000px) rotateX(3deg) translateY(1px);
  box-shadow: 
    0 4px 8px rgba(0, 0, 0, 0.1),
    0 2px 4px rgba(0, 0, 0, 0.06),
    inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 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, 0.8);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.5s ease;
  backdrop-filter: blur(12px);
  pointer-events: auto;
}

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

/* モーダル本体のスタイル */
.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  /* 初期状態: 縮小+3D回転 */
  transform: translate(-50%, -50%) scale(0.7) rotateX(-15deg) rotateY(-5deg);
  background: linear-gradient(145deg, #f8f9fa, #ffffff);
  padding: 40px;
  border-radius: 20px;
  z-index: 1002;
  opacity: 0;
  visibility: hidden;
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  max-width: 500px;
  width: 90%;
  /* 厚みを感じさせる影 */
  box-shadow: 
    0 25px 50px rgba(0, 0, 0, 0.3),
    0 15px 30px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  transform-style: preserve-3d;
  perspective: 1000px;
  border: 1px solid rgba(0, 0, 0, 0.1);
  pointer-events: auto;
}

.modal.appear {
  opacity: 1;
  visibility: visible;
  /* 表示時: 正面を向く */
  transform: translate(-50%, -50%) scale(1) rotateX(0deg) rotateY(0deg);
}

.modal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.1), transparent);
}

.modal p {
  color: #555;
  line-height: 1.7;
  margin-bottom: 30px;
  font-size: 16px;
  font-weight: 500;
  text-align: center;
}

/* 閉じるボタンのスタイル */
.close-btn {
  padding: 12px 24px;
  background: linear-gradient(145deg, #2196f3, #1976d2);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 
    0 4px 8px rgba(33, 150, 243, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transform-style: preserve-3d;
  position: relative;
  z-index: 10;
  display: block;
  margin: 0 auto;
}

.close-btn:hover {
  background: linear-gradient(145deg, #1976d2, #1565c0);
  box-shadow: 
    0 6px 12px rgba(33, 150, 243, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.close-btn:active {
  box-shadow: 
    0 2px 4px rgba(33, 150, 243, 0.3),
    inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

(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');
  }

  function closeModal() {
    mask.classList.remove('appear');
    modal.classList.remove('appear');
  }

  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();
    }
  });
})();