:root {
  --bg: #ffffff;
  --text: #222;
  --card: #f9f9f9;
  --border: #ddd;
  --tag-bg: #e6e6e6;
  --tag-active: #4a6cf7;
}

[data-theme="dark"] {
  --bg: #121212;
  --text: #eaeaea;
  --card: #1e1e1e;
  --border: #333;
  --tag-bg: #2a2a2a;
  --tag-active: #8aa4ff;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 20px;
  max-width: 1000px;
  margin-inline: auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 15px;
  border-radius: 6px;
  margin-bottom: 15px;
}

.card .card-links {
  margin-top: 8px;
  display: flex;
  gap: 12px;
  font-size: 0.9em;
}

.card .card-links a {
  color: var(--tag-active);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.card .card-links a:hover,
.card .card-links a:focus-visible {
  border-bottom-color: currentColor;
}

.tag {
  display: inline-block;
  background: var(--tag-bg);
  padding: 6px 10px;
  margin: 4px;
  border-radius: 20px;
  font-size: 0.9em;
  cursor: pointer;
}

.tag.active {
  background: var(--tag-active);
  color: white;
}

.tag.small {
  font-size: 0.8em;
  cursor: default;
}

.chip-row {
  margin-top: 8px;
}

.card {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.card.enter {
  opacity: 0;
  transform: translateY(8px);
}

.card.exit {
  opacity: 0;
  transform: translateY(-8px);
}

.tag {
  transition:
    background-color 150ms ease,
    transform 120ms ease;
}

.tag:hover {
  transform: translateY(-1px);
}

.tag:active {
  transform: scale(0.95);
}

body {
  transition:
    background-color 200ms ease,
    color 200ms ease;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

input[type="text"] {
  transition: box-shadow 150ms ease;
}

input[type="text"]:focus {
  box-shadow: 0 0 0 2px var(--tag-active);
  outline: none;
}

.controls label {
  cursor: pointer;
  transition: opacity 120ms ease;
}

.controls label:hover {
  opacity: 0.8;
}

:focus-visible {
  outline: 2px solid var(--tag-active);
  outline-offset: 2px;
}

.tag:focus-visible {
  box-shadow: 0 0 0 2px var(--tag-active);
}

.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
}

.theme-toggle .icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transform: translateY(7px);

  transition:
    transform 300ms ease,
    opacity 200ms ease;
}

/* Light mode: show moon */
:root .moon {
  opacity: 1;
  transform: translateY(7px) rotate(0deg) scale(1);
}

:root .sun {
  opacity: 0;
  transform: translateY(7px) rotate(-90deg) scale(0.5);
}

/* Dark mode: show sun */
[data-theme="dark"] .moon {
  opacity: 0;
  transform: translateY(7px) rotate(90deg) scale(0.5);
}

[data-theme="dark"] .sun {
  opacity: 1;
  transform: translateY(7px) rotate(0deg) scale(1);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--tag-active);
  outline-offset: 3px;
}

#compoundFilters {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.compound-filter {
  position: relative;
}

.compound-btn {
  padding: 8px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
}

.compound-btn.active {
  background: var(--tag-active);
  color: white;
}

.compound-panel {
  position: absolute;
  top: 110%;
  left: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  z-index: 10;
}

.compound-option {
  padding: 6px 10px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--tag-bg);
  cursor: pointer;
}

.compound-option.active {
  background: var(--tag-active);
  color: white;
}

.compound-panel {
  animation: fadeSlide 150ms ease;
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.groupedResults {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

#compoundFilters {
  display: flex;
}

.card h3 a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    border-color 150ms ease,
    color 150ms ease;
}

.card h3 a:hover,
.card h3 a:focus-visible {
  border-bottom-color: var(--tag-active);
  color: var(--tag-active);
}

.card {
  transition:
    transform 150ms ease,
    box-shadow 150ms ease,
    border-color 150ms ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card .meta {
  font-size: 0.85em;
  color: var(--meta, #666);
}