.vocabulary-copy-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}

.vocabulary-copy-actions button {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--text-color);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.8em;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.vocabulary-copy-actions button:hover {
  transform: translateY(-1px);
  opacity: 0.9;
}

#vocabulary-section {
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
}

:root[data-theme='light'] {
  --bg-color: #ffffff;
  --text-color: #000000;
  --search-bg: #f5f5f5;
  --item-bg: #ffffff;
  --hover-bg: #f0f0f0;
  --tag-active: #ff2400;
  --tag-active-bg: #ffffff;
  --category-text: #666;
}

:root[data-theme='dark'] {
  --bg-color: #1a1a1a;
  --text-color: #ffffff;
  --search-bg: #2a2a2a;
  --item-bg: #2d2d2d;
  --hover-bg: #333333;
  --tag-active: #ff6b6b;
  --tag-active-bg: #2d2d2d;
  --category-text: #b3b3b3;
}

.search-container {
  text-align: center;
  margin: 20px auto;
  max-width: 800px;
  padding: 20px;
  background: var(--search-bg);
  border-radius: 8px;
}

#vocab-search {
  width: 80%;
  padding: 12px;
  font-size: 16px;
  border: 1px solid var(--text-color);
  border-radius: 4px;
  margin-bottom: 15px;
  background: var(--bg-color);
  color: var(--text-color);
}

#sort-select {
  width: 200px;
  padding: 8px;
  margin: 15px auto;
  display: block;
  border: 1px solid var(--text-color);
  border-radius: 4px;
  background: var(--bg-color);
  color: var(--text-color);
}

.category-tags {
  margin-top: 20px;
}

.category-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 12px;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -webkit-appearance: none;
  appearance: none;
  transition: all 0.3s ease;
  border: 1px solid var(--text-color);
  background: var(--bg-color);
  color: var(--text-color);
  font-size: 15px;
  margin: 4px;
}

.category-tag.active {
  background: var(--tag-active-bg);
  color: var(--tag-active);
  border-color: var(--tag-active);
}

.category-tag:hover {
  transform: translateY(-2px);
  background: var(--hover-bg);
}

.vocabulary-item {
  margin: 15px auto;
  padding: 15px;
  border: 1px solid var(--text-color);
  border-radius: 8px;
  background: var(--item-bg);
  max-width: 1000px;
}

.vocabulary-category {
  color: var(--category-text);
  font-size: 0.9em;
  margin-bottom: 10px;
}

.detail-toggle {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

#detail-checkboxes label {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
  padding-left: 25px;
  position: relative;
  font-size: 0.9em;
}

#detail-checkboxes label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  border: 1px solid #777;
  background-color: #eee;
  border-radius: 3px;
  transition: all 0.2s ease;
}

#detail-checkboxes label::after {
  content: '✓';
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  color: white;
  font-size: 14px;
  font-weight: bold;
  opacity: 0.1;
  transition: opacity 0.2s ease;
}

#detail-checkboxes .detail-toggle:checked + label::before {
  background-color: #ff2400 !important;
  border-color: #cc1d00 !important;
}

#detail-checkboxes .detail-toggle:checked + label::after {
  opacity: 1 !important;
}

#toggle-vocab-button:hover {
  opacity: 1;
}

#toggle-vocab-button.is-active {
  background: #4caf50;
  color: white;
  border-color: #4caf50;
  opacity: 1;
}

.definition-link {
  position: relative;
  display: inline-block;
  border-bottom: none;
  padding-bottom: 2px;
  cursor: default;
}

body.vocab-feature-active .definition-link {
  cursor: pointer;
  border-bottom: 3px solid var(--text-color);
}

.definition-popover {
  position: absolute;
  min-width: 300px;
  max-width: 800px;
  box-sizing: border-box;
  word-wrap: break-word;
  word-break: break-word;
  white-space: normal;
  margin: 0;
  z-index: 9999;
  padding: 10px;
  border-radius: 8px;
  background: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--table-border, #ccc);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

@media screen and (max-width: 768px) {
  .definition-popover {
    min-width: 200px;
    max-width: calc(100vw - 20px);
  }
}

@media screen and (max-width: 480px) {
  .definition-popover {
    min-width: 160px;
    max-width: calc(100vw - 20px);
  }
}

.definition-popover.is-active {
  opacity: 1 !important;
  pointer-events: auto !important;
}

.definition-popover::after {
  content: '';
  position: absolute;
  top: 100%;
  border-width: 5px;
  border-style: solid;
  border-color: var(--bg-color) transparent transparent transparent;
}

.popover-arrow-left::after {
  left: 15px;
  right: auto;
}

.popover-arrow-right::after {
  left: auto;
  right: 15px;
}

.popover-close {
  position: absolute;
  top: 5px;
  right: 5px;
  cursor: pointer;
  font-size: 1.2em;
  font-weight: bold;
  color: var(--text-color);
  line-height: 1;
  padding: 2px 5px;
}

.popover-close:hover {
  background: #ccc;
  border-radius: 4px;
}