:root {
  --primary-blue: #0066cc;
  --hover-blue: #0052a3;
  --light-gray: #f5f5f5;
  --border-gray: #e0e0e0;
}

html {
  overflow-y: scroll;
}

body {
  margin: 0;
  font-family: sans-serif;
  background-color: white;
  color: #333;
}

/* ヘッダー */
.site-header {
  background-color: white;
  border-bottom: 1px solid var(--border-gray);
  padding: 1em;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
}

.logo {
  font-weight: bold;
  font-size: 1.2em;
}

.logo a {
  text-decoration: none;
  color: inherit;
}

/* ナビゲーション */
.main-nav a {
  margin-left: 1em;
  text-decoration: none;
  color: #333;
  transition: all 0.3s ease;
}

.main-nav a:hover {
  color: var(--primary-blue);
  text-decoration: none;
}

.main-nav a.cta {
  background-color: var(--primary-blue);
  color: white;
  padding: 8px 16px;
  border-radius: 4px;
  text-decoration: none;
}

.main-nav a.cta:hover {
  background-color: var(--hover-blue);
  text-decoration: none;
}

/* パンくずリスト */
.breadcrumb {
  background-color: white;
  border-bottom: 1px solid var(--border-gray);
  padding: 0.8em 0;
}

.breadcrumb-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1em;
  font-size: 0.9em;
}

.breadcrumb a {
  color: var(--primary-blue);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb .separator {
  margin: 0 0.5em;
  color: #999;
}

.breadcrumb .current {
  color: #333;
  font-weight: bold;
}

/* メインコンテンツ */
.content-wrapper {
  display: flex;
  justify-content: center;
  max-width: 960px;
  margin: 2em auto;
  padding: 0 1em;
}

.main-content {
  flex: 1;
  max-width: 800px;
}

.main-content h1 {
  font-size: 1.8em;
  border-bottom: 2px solid #ddd;
  padding-bottom: 0.2em;
  margin-bottom: 1em;
}

.main-content h2 {
  background-color: rgba(0, 136, 220, 0.05);
  color: #2c3e50;
  padding: 8px 16px;
  border-radius: 4px;
  margin: 1.5em 0 1em 0;
  font-size: 1.4em;
  border-left: 4px solid #2c3e50;
}

.main-content h3,
.body h3 {
  color: #34495e;
  padding-left: 0.8em;
  margin: 1.2em 0 0.8em 0;
  font-size: 1.15em;
  background: rgba(44, 62, 80, 0.03);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.main-content h2 {
  background-color: rgba(0, 136, 220, 0.05);
  color: #2c3e50;
  padding: 8px 16px;
  border-radius: 4px;
  margin: 1.5em 0 1em 0;
  font-size: 1.4em;
  border-left: 4px solid #2c3e50;
}

.body blockquote {
  background: #f0f0f0;
  padding: 1em;
  margin: 1em 0;
  font-style: italic;
}

.body h2 {
  background-color: rgba(0, 136, 220, 0.05);
  color: #2c3e50;
  padding: 8px 16px;
  border-radius: 4px;
  margin: 1.5em 0 1em 0;
  font-size: 1.4em;
  border-left: 4px solid #2c3e50;
}

/* カードコンテナ */
.card-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 2rem 0;
}

.content-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: white;
  border: 1px solid var(--border-gray);
  border-radius: 8px;
  padding: 2rem;
  transition: all 0.3s ease;
}

.content-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-blue);
}

.card-content h2 {
  color: var(--primary-blue);
  margin: 0 0 1rem 0;
}

.card-content p {
  margin: 0;
  color: #666;
}

/* フッター */
.site-footer {
  background-color: var(--light-gray);
  border-top: 1px solid var(--border-gray);
  text-align: center;
  padding: 1em;
  font-size: 0.9em;
}

.footer-links a {
  color: var(--primary-blue);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ブログページ */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2em;
  margin: 2em 0;
}

.blog-card {
  aspect-ratio: 16 / 9;
  width: 100%;
  max-width: 400px; /* 必要に応じて調整 */
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid #0088dc;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blog-card:hover {
  transform: translateY(-5px);
}

.blog-card a {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.blog-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
  display: block;
  background: #fff;
}

/* ツールページ */
.tools-grid,
.sql_tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2em;
  margin: 2em 0;
}

.tools-card,
.sql_tools-card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  overflow: hidden;
  transition: transform 0.2s;
  aspect-ratio: 16/9;
}

.tools-card:hover,
.sql_tools-card:hover {
  transform: translateY(-5px);
}

.tools-card a,
.sql_tools-card a {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.tools-card img,
.sql_tools-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  background: #f5f5f5;
  border-radius: 8px;
}

/* カテゴリーページ共通スタイル */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2em;
  margin: 2em 0;
}

.category-card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  overflow: hidden;
  transition: transform 0.2s;
  aspect-ratio: 16/9;
}

.category-card:hover {
  transform: translateY(-5px);
}

.category-card a {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.category-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  background: #f5f5f5;
  border-radius: 8px;
}

/* タグ関連 */
.tag-filter {
  margin: 2em 0;
}

.tag-filter select {
  padding: 0.5em;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1em;
}

.tag-list {
  margin: 2em 0;
}

.tag {
  display: inline-block;
  background: #f0f0f0;
  padding: 0.3em 0.8em;
  border-radius: 20px;
  margin: 0.3em;
  font-size: 0.9em;
  color: #666;
}

/* モバイルメニュー */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: 10px;
  cursor: pointer;
  position: relative;
  z-index: 1000;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: #333;
  margin: 5px 0;
  transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 998;
}

.overlay.active {
  display: block;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .main-nav {
    display: none;
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background: white;
    padding: 60px 20px 20px;
    box-shadow: -2px 0 5px rgba(0,0,0,0.1);
    transition: right 0.3s ease;
    z-index: 999;
  }
  
  .main-nav.active {
    display: block;
    right: 0;
  }
  
  .main-nav a {
    display: block;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
    font-size: 16px;
  }
  
  .main-nav a:last-child {
    border-bottom: none;
  }
  
  .card-container {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1rem 0;
  }
  
  .content-card {
    padding: 1.5rem;
  }
  
  .category-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) {
  .menu-toggle {
    display: none;
  }
  
  .overlay {
    display: none !important;
  }
}

.tools-notice {
  background-color: var(--light-gray);
  padding: 1em;
  border-radius: 4px;
  margin: 1em 0;
}

details {
  margin: 1em 0;
}

details summary {
  background-color: #fff3cd;
  padding: 1em;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid #ffeeba;
}

details summary:hover {
  background-color: #ffeeba;
}

details .tools-notice {
  background-color: #fff3cd;
  padding: 1em;
  border-radius: 4px;
  margin-top: 0.5em;
  border: 1px solid #ffeeba;
}

a {
  text-decoration: none;
}

a:hover,
a:active {
  text-decoration: underline;
}