.feature-browser {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.8fr);
  gap: 26px;
  align-items: stretch;
}

.tab-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tab-button {
  position: relative;
  display: flex;
  width: 100%;
  min-height: 62px;
  align-items: center;
  padding: 14px 18px;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink-muted);
  font-weight: 750;
  text-align: left;
  transition: color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.tab-button:hover {
  color: var(--color-ink);
  transform: translateX(3px);
}

.tab-button[aria-selected="true"],
.tab-button.is-active {
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

.tab-button[aria-selected="true"]::after,
.tab-button.is-active::after {
  position: absolute;
  right: 16px;
  bottom: 8px;
  left: 16px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-action);
  content: "";
}

.tab-panels {
  min-width: 0;
}

.tab-panel {
  min-height: 100%;
  padding: clamp(26px, 5vw, 58px);
  border-radius: var(--radius-lg);
  background: var(--gradient-brand);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.tab-panel[hidden] {
  display: none;
}

.tab-panel h2,
.tab-panel h3,
.tab-panel strong {
  color: var(--color-ink);
}

.tab-panel p {
  max-width: 48em;
}

.element-index {
  display: inline-grid;
  width: 68px;
  height: 68px;
  margin-bottom: 28px;
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 900;
  place-items: center;
}

.element-index small {
  position: absolute;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 9px;
}

.config-line {
  display: block;
  max-width: 100%;
  margin-top: 24px;
  padding: 14px 17px;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.toc-tabs {
  position: sticky;
  z-index: 20;
  top: 12px;
  display: flex;
  max-width: 100%;
  margin-bottom: 40px;
  padding: 8px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  gap: 6px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.toc-tabs a {
  display: inline-flex;
  min-height: 42px;
  flex: 0 0 auto;
  align-items: center;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.toc-tabs a:hover {
  background: var(--color-panel-mint);
  color: var(--color-ink);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  overflow: clip;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink);
}

.faq-item[open] {
  background: var(--color-canvas);
  box-shadow: var(--shadow-card);
}

.faq-question {
  display: flex;
  min-height: 64px;
  padding: 18px 22px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--color-ink);
  font-weight: 780;
  cursor: pointer;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  border-right: 2px solid var(--color-action);
  border-bottom: 2px solid var(--color-action);
  content: "";
  transform: rotate(45deg) translateY(-3px);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  transform: rotate(225deg) translate(-2px, -2px);
}

.faq-answer {
  padding: 0 22px 22px;
  color: var(--color-ink-muted);
}

.faq-answer > :last-child {
  margin-bottom: 0;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.term-card {
  padding: 26px;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink);
}

.term-card dt {
  margin-bottom: 10px;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 850;
}

.term-card dd {
  margin: 0;
  color: var(--color-ink-muted);
}

.term-code {
  display: inline-block;
  margin-top: 14px;
  color: var(--color-action-hover);
  font-family: var(--font-mono);
  font-size: 12px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.download-card {
  display: flex;
  min-width: 0;
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  flex-direction: column;
}

.download-card.is-featured {
  background: var(--gradient-soft);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
}

.download-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.download-card-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}

.download-card h3 {
  margin-bottom: 8px;
}

.download-card p {
  color: var(--color-ink-muted);
}

.download-card-actions {
  display: flex;
  margin-top: auto;
  padding-top: 18px;
  flex-wrap: wrap;
  gap: 10px;
}

.client-badge {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  padding: 5px 10px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 800;
  line-height: 1.35;
}

.client-badge-primary {
  background: var(--color-action);
  color: var(--color-white);
}

.client-badge-recommended {
  background: var(--color-success);
  color: var(--color-white);
}

.client-badge-eol {
  background: var(--color-error);
  color: var(--color-white);
}

[data-cdnver] {
  display: none;
}

[data-cdnver]:not(:empty) {
  display: inline-flex;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.article-card {
  display: flex;
  min-width: 0;
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
  transform: translateY(-4px);
}

.article-card-meta {
  display: flex;
  margin-bottom: 16px;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.article-card h3 {
  font-size: 21px;
}

.article-card p {
  color: var(--color-ink-muted);
}

.article-card-link {
  margin-top: auto;
  color: var(--color-action-hover);
  font-weight: 750;
}

.callout {
  position: relative;
  margin: 28px 0;
  padding: 22px 24px 22px 30px;
  border-radius: var(--radius-md);
  background: var(--color-panel-mint);
  color: var(--color-ink);
}

.callout::before {
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 12px;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-action);
  content: "";
}

.callout strong,
.callout h3,
.callout h4 {
  color: var(--color-ink);
}

.callout > :last-child {
  margin-bottom: 0;
}

.callout-warning {
  background: var(--color-warning);
  color: var(--color-ink);
}

.callout-error {
  background: var(--color-error);
  color: var(--color-white);
}

.callout.callout-error strong,
.callout.callout-error h3,
.callout.callout-error h4,
.callout.callout-error p,
.callout.callout-error a {
  color: var(--color-white);
}

.prose .button-primary,
.prose .button-primary:hover {
  color: var(--color-white);
}

.prose {
  color: var(--color-ink);
}

.prose h2 {
  margin-top: 2.2em;
  scroll-margin-top: 90px;
}

.prose h3 {
  margin-top: 1.8em;
  scroll-margin-top: 90px;
}

.prose p,
.prose li {
  color: var(--color-ink-muted);
}

.prose a {
  color: var(--color-action-hover);
}

.prose > .data-table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.end-download-card {
  display: grid;
  margin-top: 56px;
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius-lg);
  background: var(--gradient-soft);
  color: var(--color-ink);
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 26px;
}

.end-download-card p {
  margin-bottom: 0;
  color: var(--color-ink-muted);
}

.dl-fab {
  position: fixed;
  z-index: 80;
  right: max(18px, var(--gutter));
  bottom: 20px;
  display: flex;
  max-width: min(340px, calc(100vw - var(--gutter) * 2));
  min-height: 64px;
  align-items: center;
  gap: 12px;
  padding: 12px 17px;
  border-radius: var(--radius-md);
  background: var(--color-action);
  color: var(--color-white);
  box-shadow: var(--shadow-action);
  text-decoration: none;
}

.dl-fab:hover {
  background: var(--color-action-hover);
  color: var(--color-white);
  transform: translateY(-2px);
}

.dl-fab-icon {
  display: grid;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  color: var(--color-action-hover);
  place-items: center;
}

.dl-fab-icon svg {
  width: 20px;
  height: 20px;
}

.dl-fab-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.dl-fab-copy strong {
  color: var(--color-white);
  font-size: 14px;
}

.dl-fab-copy small {
  color: var(--color-white);
  font-size: 12px;
}

.preview-type-stack {
  display: grid;
  gap: 22px;
}

.preview-type-display {
  margin: 0;
  font-size: 48px;
  font-weight: 900;
}

.preview-type-body {
  max-width: 46em;
  color: var(--color-ink-muted);
}

.preview-type-mono {
  color: var(--color-action-hover);
  font-family: var(--font-mono);
}

.preview-button-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (max-width: 900px) {
  .feature-browser {
    grid-template-columns: 1fr;
  }

  .tab-list {
    max-width: 100%;
    overflow-x: auto;
    flex-direction: row;
    -webkit-overflow-scrolling: touch;
  }

  .tab-button {
    min-width: 170px;
    flex: 0 0 auto;
  }

  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .download-grid,
  .article-grid,
  .glossary-grid {
    grid-template-columns: 1fr;
  }

  .tab-panel {
    padding: 24px;
  }

  .end-download-card {
    grid-template-columns: 1fr;
  }

  .dl-fab {
    right: 16px;
    bottom: 16px;
    left: 16px;
    max-width: none;
  }

  .preview-type-display {
    font-size: 30px;
  }

  .toc-tabs {
    top: 8px;
    border-radius: var(--radius-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tab-button,
  .article-card,
  .dl-fab {
    transition: none;
  }
}