Modal / 30 グラスカード フルスクリーン｜Glass Card Fullscreen

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

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

<!-- モーダル本体（フルスクリーン背景） -->
<div class="modal fullscreen">
  <!-- グラスカード（コンテンツ） -->
  <div class="modal-content">
    <div class="close-btn-container">
      <button class="close-btn">×</button>
    </div>
    <div class="fullscreen-content">
      <p class="modal-title">Glassmorphism</p>
      <p>画面全体に美しいカラーグラデーションを敷き、その中央にすりガラスのようなカード（Glassmorphism）を配置するリッチな表現のモーダルです。背景の全画面表示と遅れてカードが浮き上がるアニメーションが特徴です。</p>
      <div class="close-btn-container">
        <button class="action-btn close-btn">Accept</button>
      </div>
    </div>
  </div>
</div>

/* 開くボタンのスタイル */
.modal-button {
  padding: 15px 30px;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: #ffffff;
  border: none;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.4);
}

.modal-button:hover {
  background: linear-gradient(135deg, #f5576c 0%, #f093fb 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 87, 108, 0.6);
}

/* 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); 
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
}

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

/* フルスクリーンモーダル（背景） */
.modal.fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #ff9a9e;
  background-image: 
    radial-gradient(at 40% 20%, hsla(28,100%,74%,1) 0px, transparent 50%),
    radial-gradient(at 80% 0%, hsla(189,100%,56%,1) 0px, transparent 50%),
    radial-gradient(at 0% 50%, hsla(355,100%,93%,1) 0px, transparent 50%),
    radial-gradient(at 80% 50%, hsla(340,100%,76%,1) 0px, transparent 50%),
    radial-gradient(at 0% 100%, hsla(22,100%,77%,1) 0px, transparent 50%),
    radial-gradient(at 80% 100%, hsla(242,100%,70%,1) 0px, transparent 50%),
    radial-gradient(at 0% 0%, hsla(343,100%,76%,1) 0px, transparent 50%);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.fullscreen.appear {
  opacity: 1;
  visibility: visible;
}

/* モーダル内部のグラスカード */
.modal-content {
  width: 100%;
  max-width: 700px;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.2);
  display: flex;
  flex-direction: column;
  position: relative;
  transform: translateY(30px) scale(0.95);
  opacity: 0;
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1) 0.1s;
}

/* appear時のカードの動き */
.modal.fullscreen.appear .modal-content {
  transform: translateY(0) scale(1);
  opacity: 1;
}

/* 右上が絶対配置で「×」ボタン */
.modal.fullscreen > .modal-content > .close-btn-container {
  position: absolute;
  top: 15px;
  right: 15px;
  z-index: 10;
}

.modal.fullscreen > .modal-content > .close-btn-container .close-btn {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.3);
  color: #333333;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  font-size: 24px;
  font-weight: 300;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.modal.fullscreen > .modal-content > .close-btn-container .close-btn:hover {
  background: rgba(255, 255, 255, 0.6);
  transform: rotate(90deg);
}

/* コンテンツ中央揃え */
.fullscreen-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 50px;
  text-align: center;
}

.fullscreen-content .modal-title {
  color: #1f2937;
  font-size: 2rem;
  margin-top: 0;
  margin-bottom: 15px;
  font-weight: 700;
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.5);
}

.fullscreen-content p {
  color: #4b5563;
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 25px;
  max-width: 600px;
}

/* 下部アクションボタン */
.fullscreen-content .close-btn-container {
  margin-top: 20px;
}

.fullscreen-content .action-btn {
  padding: 14px 40px;
  background: rgba(255, 255, 255, 0.5);
  color: #1f2937;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(4px);
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1.5;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.fullscreen-content .action-btn:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px 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');
    if (modal.classList.contains('fullscreen')) {
      document.body.style.overflow = 'hidden';
    }
  }

  function closeModal() {
    mask.classList.remove('appear');
    modal.classList.remove('appear');
    if (modal.classList.contains('fullscreen')) {
      document.body.style.overflow = '';
    }
  }

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