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<!DOCTYPE html>
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<html lang="ja">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>モダンドロップダウンナビゲーション</title>
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<style>
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* {
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box-sizing: border-box;
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}
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body {
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font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
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margin: 0;
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background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
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min-height: 100vh;
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}
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.dropdown-nav {
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background: rgba(255, 255, 255, 0.95);
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backdrop-filter: blur(10px);
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padding: 30px 20px;
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box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
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}
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.tab-list {
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display: grid;
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grid-template-columns: repeat(4, 1fr);
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gap: 16px;
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padding: 0;
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margin: 0 auto;
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max-width: 1000px;
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list-style: none;
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}
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.tab-list-item {
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position: relative;
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}
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.tab-link {
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display: flex;
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align-items: center;
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justify-content: center;
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gap: 8px;
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padding: 16px 20px;
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background: white;
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color: #2c3e50;
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text-align: center;
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text-decoration: none;
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border-radius: 12px;
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font-weight: 600;
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font-size: 14px;
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letter-spacing: 0.3px;
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box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
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transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
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position: relative;
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overflow: hidden;
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}
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.tab-link::before {
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content: '';
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
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opacity: 0;
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transition: opacity 0.3s ease;
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z-index: -1;
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}
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.tab-link:hover {
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transform: translateY(-3px);
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box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
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color: white;
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}
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.tab-link:hover::before {
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opacity: 1;
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}
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.tab-link::after {
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content: '▼';
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font-size: 10px;
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transition: transform 0.3s ease;
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opacity: 0.6;
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}
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.tab-list-item:not(:has(.dropdown-menu)) .tab-link::after {
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display: none;
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}
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.tab-list-item:hover .tab-link::after {
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transform: rotate(180deg);
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}
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.dropdown-menu {
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position: absolute;
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top: calc(100% + 8px);
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left: 0;
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width: 100%;
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min-width: 200px;
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background: white;
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border-radius: 12px;
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box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
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list-style: none;
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padding: 8px 0;
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z-index: 100;
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visibility: hidden;
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opacity: 0;
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transform: translateY(-15px) scale(0.95);
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transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
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}
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.dropdown-menu::before {
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content: '';
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position: absolute;
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top: -6px;
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left: 50%;
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transform: translateX(-50%);
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width: 12px;
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height: 12px;
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background: white;
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border-radius: 2px;
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transform: translateX(-50%) rotate(45deg);
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box-shadow: -2px -2px 4px rgba(0, 0, 0, 0.05);
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}
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.tab-list-item:hover .dropdown-menu {
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visibility: visible;
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opacity: 1;
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transform: translateY(0) scale(1);
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}
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.dropdown-menu li {
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margin: 0;
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}
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.dropdown-menu li a {
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display: block;
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padding: 12px 20px;
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color: #2c3e50;
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text-decoration: none;
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white-space: normal;
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word-wrap: break-word;
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font-size: 14px;
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transition: all 0.2s ease;
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border-left: 3px solid transparent;
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}
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.dropdown-menu li a:hover {
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background: linear-gradient(90deg, rgba(102, 126, 234, 0.1) 0%, transparent 100%);
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border-left-color: #667eea;
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padding-left: 24px;
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color: #667eea;
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}
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.dropdown-menu li:not(:last-child) {
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border-bottom: 1px solid rgba(0, 0, 0, 0.05);
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}
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.content {
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padding: 60px 20px;
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text-align: center;
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max-width: 800px;
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margin: 0 auto;
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}
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.content h1 {
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color: #2c3e50;
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font-size: 36px;
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margin-bottom: 20px;
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font-weight: 700;
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}
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.content p {
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color: #5a6c7d;
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font-size: 16px;
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line-height: 1.6;
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}
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@media (max-width: 768px) {
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.tab-list {
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grid-template-columns: repeat(2, 1fr);
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gap: 12px;
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}
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.tab-link {
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padding: 14px 16px;
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font-size: 13px;
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}
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}
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@media (max-width: 480px) {
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.tab-list {
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grid-template-columns: 1fr;
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}
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}
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</style>
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</head>
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<body>
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<nav class="dropdown-nav">
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<ul class="tab-list">
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 1</a>
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<ul class="dropdown-menu">
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<li><a href="#">リンク A</a></li>
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<li><a href="#">リンク B</a></li>
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</ul>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 2</a>
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<ul class="dropdown-menu">
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<li><a href="#">リンク C</a></li>
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<li><a href="#">リンク D</a></li>
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<li><a href="#">リンク E(長い文章のテストです。どうでしょうか?)</a></li>
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</ul>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 3</a>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 4</a>
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<ul class="dropdown-menu">
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<li><a href="#">リンク F</a></li>
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</ul>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 5</a>
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<ul class="dropdown-menu">
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<li><a href="#">リンク G</a></li>
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<li><a href="#">リンク H</a></li>
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</ul>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 6</a>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 7</a>
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<ul class="dropdown-menu">
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<li><a href="#">リンク I</a></li>
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<li><a href="#">リンク J</a></li>
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</ul>
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</li>
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<li class="tab-list-item">
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<a href="#" class="tab-link">タブ 8</a>
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<ul class="dropdown-menu">
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<li><a href="#">リンク K</a></li>
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</ul>
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</li>
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</ul>
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</nav>
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<div class="content">
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<h1>内容</h1>
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<p>ここにウェブサイトのメインコンテンツが表示されます。</p>
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</div>
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</body>
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</html> |
