#mainContent {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

#leftColumn {
  flex: 2;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#rightColumn {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* タブボタンの共通デザイン */
#tab-buttons {
  color: #444;
  display: none;
  justify-content: space-around;
  margin-bottom: 12px;
  border-bottom: 2px solid #ddd;
}

#tab-buttons button {
  flex: 1;
  padding: 10px 0;
  border: none;
  background: none;
  font-size: 14px;
  color: #666;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
}

#tab-buttons button.active {
  color: #004c99;
  border-bottom: 3px solid #004c99;
  font-weight: 600;
}

.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}

#search-box {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
  background: #f5f7fa;
  padding: 16px 20px;
  border: 1px solid #dee2e6;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  top: 0;
  z-index: 999;
}

#searchInput {
  flex: 1 1 240px;
  min-width: 200px;
  padding: 10px 16px;
  font-size: 15px;
  border: 1px solid #bbb;
  border-radius: 30px;
  outline: none;
  transition: all 0.3s ease;
  background: #fff;
}
#searchInput:focus {
  border-color: #004c99;
  box-shadow: 0 0 0 2px rgba(0, 76, 153, 0.2);
}

#sortSelect {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' fill='none' stroke='gray' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-position: right 12px center;
  background-size: 16px;
  padding: 8px 36px 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid #bbb;
  background-color: #fff;
  transition: box-shadow 0.2s ease;
}
#sortSelect:hover {
  box-shadow: 0 0 0 2px rgba(0, 87, 163, 0.1);
}

.genre-scroll-wrapper {
  position: relative;
}

#genres {
  display: flex;
  flex-wrap: nowrap; /* 折り返さない */
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  gap: 4px;
}

/* スクロールバー非表示（必要なら） */
#genres::-webkit-scrollbar {
  display: none;
}
#genres {
  -ms-overflow-style: none; /* IE/Edge */
  scrollbar-width: none;    /* Firefox */
}

/* グラデーション影（左右） */
.genre-scroll-wrapper::before,
.genre-scroll-wrapper::after {
  content: "";
  position: absolute;
  top: 0;
  width: 30px;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}
.genre-scroll-wrapper::before {
  left: 0;
  background: linear-gradient(to right, white 0%, transparent 100%);
}
.genre-scroll-wrapper::after {
  right: 0;
  background: linear-gradient(to left, white 0%, transparent 100%);
}
.genre-scroll-wrapper::before,
.genre-scroll-wrapper::after {
  display: none;
}

/* ◀▶ボタン */
.scroll-indicator {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  background: rgba(255, 255, 255, 0.85);
  color: #999;
  padding: 4px 8px;
  cursor: pointer;
  z-index: 2;
  user-select: none;
}
.scroll-indicator.left {
  left: 0;
}
.scroll-indicator.right {
  right: 0;
}

#genres button {
  padding: 10px 14px;
  margin: 0;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 15px;
  color: #334;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.1s ease;
  font-weight: bold;
}

#genres button:hover {
  color: #1b2b4f;
  border-bottom-color: #5a6b8c;
}

#genres button.active {
  background-color: #004c99;
  color: #fff;
  box-shadow: inset 0 -2px 4px rgba(0,0,0,0.2);
}

#scrollSentinel {
  height: 50px;
}
#scrollToTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
  z-index: 999;
  font-size: 24px;
  background: #004c99;
  color: white;
  border-radius: 50%;
  padding: 10px;
  border: none;
  cursor: pointer;
}

#ios-tip {
  display: none;
  position: fixed;
  bottom: 20px;
  left: 0;
  right: 0;
  padding: 10px;
  background: #fff;
  text-align: center;
  box-shadow:0 0 5px #000;
}

#updateNotice {
  display: none;
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  z-index: 9999;
  cursor: pointer;
  font-size: 14px;
  transition: opacity 0.5s ease;
}

.article-image {
  width: 200px;
  height: auto;
  margin: 8px 0;
  border: 1px solid #ccc;
  cursor: zoom-in;
  transition: opacity 0.2s ease;
}
.article-image:hover {
  opacity: 0.8;
}
#imageModal img {
  box-shadow: 0 0 20px #fff;
  border-radius: 8px;
}
.modal {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-color: rgba(0,0,0,0.85);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;

  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal.show {
  opacity: 1;
  pointer-events: auto;
}
.modal img {
  max-width: 90vw;
  max-height: 90vh;
  box-shadow: 0 0 30px #fff;
  border-radius: 10px;
  transition: transform 0.3s ease;
  transform: scale(0.95);
}
.modal.show img {
  transform: scale(1);
}
.hidden {
  display: none;
}
.close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  color: white;
  font-size: 32px;
  border: none;
  cursor: pointer;
  z-index: 1001;
  transition: transform 0.2s ease;
}
.close-btn:hover {
  transform: scale(1.2);
}
.button {
  background-color: #85dcb0;
  color: #2f3640;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  text-decoration: none;
  display: inline-block;
  font-weight: bold;
  transition: background-color 0.3s ease;
}
.button:hover {
  background-color: #41b3a3;
}
#tag-actions {
  margin: 8px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag-button {
  margin: 4px;
  padding: 4px 10px;
  font-size: 13px;
  color: #333;
  background: none;
  border: 1px solid #ccc;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.tag-button:hover {
  border-color: #888;
  color: #000;
}
.tag-button.active {
  background: linear-gradient(to bottom, #004c99, #003366);
  color: #fff;
  font-weight: bold;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

#toggle-tags {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 4px;
  padding: 4px 10px;
  background-color: #004c99;
  color: white;
  font-weight: normal;
  font-size: 13px;
  border: 1px solid #ccc;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}
#toggle-tags:hover {
  background-color: #003366;
}
#clear-tags {
  margin: 4px;
  padding: 4px 10px;
  font-size: 13px;
  color: #004c99;
  background: none;
  border-color: #004c99;
  border: 1px solid #0057a3;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
}
#clear-tags:hover {
  background-color: #e6f0fa;
  color: #003366;
  border-color: #003366;
}
#toggle-tags:active, #clear-tags:active {
  transform: scale(0.95); /* 押したとき少し縮む */
}

.clickable-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  color: #007aff;
  background-color: #f0f0f0;
  padding: 2px 8px;
  margin: 4px 4px 0 0;
  border-radius: 12px;
  font-size: 12px;
  line-height: 1.7;
  text-decoration: none;
  cursor: pointer;
}
.clickable-tag:hover {
  transform: scale(1.05);
  color: #0057a3;
}
.wikipedia-icon {
  margin-left: 4px;
  display: inline-flex;
  align-items: center;
  height: 1em;
}
.wikipedia-icon img {
  height: 1em;
  width: 1em;
  display: block;
  opacity: 0.75;
  transition: opacity 0.2s ease;
}
.wikipedia-icon:hover img {
  opacity: 1;
}

.no-results-message {
  text-align: center;
  padding: 2rem;
  color: #666;
  font-style: italic;
  font-size: 1rem;
}
.hidden {
  display: none;
}

body {
  background-color: #ffffff;
  font-family: 'Inter', 'Helvetica Neue', 'Segoe UI', sans-serif;
  color: #222; /* 濃いグレーで読みやすく */
  line-height: 1.7;
}

.title {
  font-size: 24px;
  font-weight: bold;
  color: #111;
  margin-bottom: 0.5em;
}
.date {
  font-size: 0.85rem;
  color: #888;
  margin-bottom: 0.5rem;
  text-align: right;
}
.article-body {
  font-size: 16px;
  line-height: 1.8;
  margin-top: 0.5em;
  margin-bottom: 1rem;
  white-space: normal;
  color: #333;
}

.article-body p {
  text-align: justify;
  line-height: 1.8;
  margin-bottom: 1.5em;
}

.genre {
  background-color: #004c99;
  color: white;
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: bold;
  display: inline-block;
  margin-bottom: 0.5rem;
}
.article {
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid #ddd;
  transition: all 0.3s ease;
  background-color: white;
}
.article:hover {
  background-color: #f9f9f9;
  border-color: #ccc;
  box-shadow: 0 6px 12px rgba(0,0,0,0.06);
}

#thumbnailGallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); /* スマホ対応 */
  gap: 8px;
  margin: 16px 0; /* 余白を減らす */
}

img.thumbnail {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: zoom-in;
}

img.thumbnail:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* PC用のレイアウト調整 */
@media (min-width: 800px) {
  #genres {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .genre-scroll-wrapper::before,
  .genre-scroll-wrapper::after,
  .scroll-indicator {
    display: none;
  }

  #mainContent {
    flex-direction: row;
  }
  #news {
    display: block;
    flex: 3;
  }
  #mainContent.active-articles #news {
    display: block;
  }
  #mainContent.active-tags #tag-filter {
    display: block;
  }
  #mainContent.active-thumbnails #thumbnailGallery {
    display: block;
  }
}

/* スマホ時のみ表示 */
@media (max-width: 799px) {
  .body {
    font-size: 14px;
    line-height: 1.6;
  }
  #genres {
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch; /* iOSスムーズスクロール対応 */
    scrollbar-width: none; /* Firefox用: スクロールバー非表示（任意） */
  }

  #genres::-webkit-scrollbar {
    display: none; /* Chrome, Safariでスクロールバー非表示（任意） */
  }

  #genres button {
    display: inline-block;
    white-space: nowrap;
    flex: 0 0 auto;
  }

  #tab-buttons {
    display: flex;
    justify-content: space-around;
    margin-bottom: 16px;
    border-bottom: 2px solid #ddd;
  }
  #tab-buttons button {
    flex: 1;
    padding: 10px;
    font-size: 14px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    color: #444;
  }
  #tab-buttons button.active {
    color: #0a3d62;
    border-bottom: 3px solid #0a3d62;
    font-weight: 600;
  }

  /* 表示切替 */
  #news, #tag-filter, #thumbnailGallery {
    display: none;
  }
  #mainContent.active-articles #news,
  #mainContent.active-tags #tag-filter {
    display: block;
  }
  #mainContent.active-thumbnails #thumbnailGallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
  }
  h2 {
    display: none;
  }
}