Modal / 20 マテリアルデザイン｜Material Design

<!-- モーダルを開くボタン -->
<button class="modal-button">Material Design 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>【Material Design Modal】</p>
    <p>Google風マテリアルデザイン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: #2196F3;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 5px rgba(33, 150, 243, 0.2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.modal-button:hover {
  background: #1976D2;
  box-shadow: 0 4px 8px rgba(33, 150, 243, 0.3);
  transform: translateY(-1px);
}

.modal-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(33, 150, 243, 0.2);
}

/* 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, 0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.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(0.9);
  background: #fff;
  padding: 0;
  border-radius: 8px;
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  max-width: 500px;
  width: 90%;
  /* マテリアル特有の高度な影 */
  box-shadow: 
    0 11px 15px -7px rgba(0, 0, 0, 0.2), 
    0 24px 38px 3px rgba(0, 0, 0, 0.14), 
    0 9px 46px 8px rgba(0, 0, 0, 0.12);
  overflow: hidden;
}

.modal.appear {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.modal-content {
  padding: 24px;
}

.modal p {
  color: rgba(0, 0, 0, 0.87);
  font-size: 16px;
  line-height: 1.5;
  margin-bottom: 24px;
  font-weight: 400;
  text-align: center;
}

.close-btn-container {
  display: flex;
  justify-content: flex-end;
  padding: 8px 0;
  border-top: 1px solid rgba(0, 0, 0, 0.12);
  margin-top: 16px;
}

.close-btn {
  padding: 8px 16px;
  background: transparent;
  color: #2196F3;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  min-width: 64px;
  position: relative;
  overflow: hidden;
}

.close-btn:hover {
  background: rgba(33, 150, 243, 0.08);
}

.close-btn:active {
  background: rgba(33, 150, 243, 0.12);
}

/* JSで追加されるリップルエフェクト用 */
.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(33, 150, 243, 0.3);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

(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');
  }

  // 波紋(リップル)エフェクトを追加する関数
  function createRipple(event, element) {
    var rect = element.getBoundingClientRect();
    var size = Math.max(rect.width, rect.height);
    var x = event.clientX - rect.left - size / 2;
    var y = event.clientY - rect.top - size / 2;

    var ripple = document.createElement('span');
    ripple.style.width = ripple.style.height = size + 'px';
    ripple.style.left = x + 'px';
    ripple.style.top = y + 'px';
    ripple.className = 'ripple-effect';
    element.appendChild(ripple);

    setTimeout(function () {
      ripple.remove();
    }, 600);
  }

  btn.addEventListener('click', openModal);

  mask.addEventListener('click', closeModal);

  closeBtns.forEach(function(b) {
    b.addEventListener('click', function(e) {
      createRipple(e, b);
      // ボタンの波紋アニメーションを見せるため少し待つ
      setTimeout(closeModal, 200);
    });
  });

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