Modal / 17 ジオメトリック

デザイン見本

直線構成とオレンジ色を基調とし、背景には複数の`linear-gradient`と`repeating-linear-gradient`を重ね合わせた複雑な幾何学模様（グリッド・斜線）を作り出しています。全体的に角丸を使わずソリッドな印象に。

実装コード

HTML

<!-- モーダルを開くボタン -->
<button class="modal-button">Geometric Pattern 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>【Geometric Pattern Modal】</p>
    <p>幾何学模様のモダンなモーダルウィンドウです。</p>
    <button class="close-btn">Close</button>
  </div>
</div>

CSS

/* 開くボタンのスタイル */
.modal-button {
  padding: 12px 24px;
  background: linear-gradient(135deg, #FF5722 0%, #FF7043 50%, #FF8A65 100%);
  color: #fff;
  border: none;
  border-radius: 0;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 87, 34, 0.3);
}

.modal-button:hover {
  background: linear-gradient(135deg, #D84315 0%, #FF5722 50%, #FF7043 100%);
  box-shadow: 0 6px 20px rgba(255, 87, 34, 0.4);
  transform: translateY(-2px);
}

/* 背景マスクのスタイル */
.mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 87, 34, 0.4);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s 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);
  background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 50%, #FFCC80 100%);
  padding: 40px;
  border-radius: 0;
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
  max-width: 500px;
  width: 90%;
  box-shadow: 0 10px 30px rgba(255, 87, 34, 0.2);
  border: 3px solid #FF5722;
  overflow: hidden;
}

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

/* 幾何学模様を構成するpseudo element */
.modal::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(45deg, transparent 40%, rgba(255, 87, 34, 0.1) 50%, transparent 60%),
    linear-gradient(-45deg, transparent 30%, rgba(255, 152, 0, 0.1) 50%, transparent 70%),
    repeating-linear-gradient(90deg,
      transparent,
      transparent 20px,
      rgba(255, 87, 34, 0.05) 20px,
      rgba(255, 87, 34, 0.05) 22px),
    repeating-linear-gradient(0deg,
      transparent,
      transparent 20px,
      rgba(255, 152, 0, 0.05) 20px,
      rgba(255, 152, 0, 0.05) 22px);
  pointer-events: none;
}

/* 内側にある細い枠線 */
.modal::after {
  content: '';
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  bottom: 10px;
  border: 2px solid rgba(255, 87, 34, 0.3);
  pointer-events: none;
}

.modal p {
  color: #E65100;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
  position: relative;
  z-index: 2;
}

/* 閉じるボタンのスタイル */
.close-btn {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 32px;
  height: 32px;
  background: rgba(255, 87, 34, 0.9);
  color: #fff;
  border: none;
  border-radius: 0;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 15;
  line-height: 1;
}

.close-btn:hover {
  background: rgba(255, 152, 0, 0.9);
  transform: scale(1.1);
  box-shadow: 0 2px 8px rgba(255, 87, 34, 0.4);
}

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