Tab Menu / 09 グラスモーフィズム

デザイン見本

Tab 1
Tab 2
Tab 3

Good morning. This is the content of Tab 1.

Hello. This is the content of Tab 2.

Good evening. This is the content of Tab 3.

すりガラスのような質感（Glassmorphism）を取り入れたデザインです。背景の流体グラデーションが透けて見え、洗練された美しさを演出します。最新のOSデザインのようなトレンド感を取り入れたい場合に最適です。

実装コード

HTML

<div class="tab-container">
  <ul>
    <li class="selected" data-id="tab-1">Tab 1</li>
    <li data-id="tab-2">Tab 2</li>
    <li data-id="tab-3">Tab 3</li>
  </ul>
  <div class="tab-content selected" id="tab-1">
    Tab 1 のコンテンツ
  </div>
  <div class="tab-content" id="tab-2">
    Tab 2 のコンテンツ
  </div>
  <div class="tab-content" id="tab-3">
    Tab 3 のコンテンツ
  </div>
</div>

CSS

.tab-container {
  border-radius: 16px;
  position: relative;
  background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4, #feca57);
  padding: 2px;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4, #feca57); }
  25% { background: linear-gradient(45deg, #4ecdc4, #45b7d1, #96ceb4, #feca57, #ff6b6b); }
  50% { background: linear-gradient(45deg, #45b7d1, #96ceb4, #feca57, #ff6b6b, #4ecdc4); }
  75% { background: linear-gradient(45deg, #96ceb4, #feca57, #ff6b6b, #4ecdc4, #45b7d1); }
}

.tab-container ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 16px 16px 0 0;
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: none;
}

.tab-container ul::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
      rgba(255, 255, 255, 0.1) 0%, 
      rgba(255, 255, 255, 0.05) 50%, 
      rgba(255, 255, 255, 0.1) 100%);
  pointer-events: none;
}

.tab-container ul li {
  flex: 1;
  padding: 18px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  letter-spacing: 0.5px;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.tab-container ul li:last-child {
  border-right: none;
}

.tab-container ul li::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
      transparent 0%, 
      rgba(255, 255, 255, 0.1) 50%, 
      transparent 100%);
  transition: left 0.6s ease;
}

.tab-container ul li:hover::before {
  left: 100%;
}

.tab-container ul li.selected {
  color: #fff;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  box-shadow: 
      0 8px 32px rgba(0, 0, 0, 0.1),
      inset 0 1px 0 rgba(255, 255, 255, 0.3);
  font-weight: 600;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.tab-container ul li.selected::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4, #feca57);
  animation: rainbowFlow 3s linear infinite;
}

@keyframes rainbowFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

.tab-container ul li:not(.selected):hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.tab-container .tab-content {
  display: none;
  padding: 32px;
  min-height: 180px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: rgba(255, 255, 255, 0.9);
  border-radius: 0 0 16px 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-top: none;
  position: relative;
  overflow: hidden;
  box-shadow: 
      0 8px 32px rgba(0, 0, 0, 0.1),
      inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.tab-container .tab-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
      rgba(255, 255, 255, 0.05) 0%, 
      rgba(255, 255, 255, 0.02) 50%, 
      rgba(255, 255, 255, 0.05) 100%);
  pointer-events: none;
}

.tab-container .tab-content.selected {
  display: block;
  animation: glassFadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes glassFadeIn {
  from { 
      opacity: 0; 
      transform: translateY(-20px) scale(0.95);
      backdrop-filter: blur(10px);
  }
  to { 
      opacity: 1; 
      transform: translateY(0) scale(1);
      backdrop-filter: blur(20px);
  }
}

const tabContainer = document.querySelector('.tab-container');
const tabMenuItems = tabContainer.querySelectorAll('ul li');
const tabContents = tabContainer.querySelectorAll('.tab-content');

tabMenuItems.forEach(tabMenuItem => {
  tabMenuItem.addEventListener('click', () => {
    tabMenuItems.forEach(item => {
      item.classList.remove('selected');
    });
    tabMenuItem.classList.add('selected');

    tabContents.forEach(tabContent => {
      tabContent.classList.remove('selected');
    });
    document.getElementById(tabMenuItem.dataset.id).classList.add('selected');
  });
});