:root {
  --component-tab-line: 3px;
  --component-fab-offset: 20px;
  --component-progress-time: 8s;
}

.chip-row,
.badge-row,
.platform-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.chip-row,
.badge-row {
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip,
.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font: 600 12px/1.2 var(--font-mono);
  white-space: nowrap;
}

.chip-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-brand);
}

.chip-cyan .chip-dot {
  background: var(--color-link);
}

.chip-warning .chip-dot {
  background: var(--color-warning);
}

.badge-primary {
  border-color: var(--color-brand);
  background: var(--color-brand-soft);
  color: var(--color-brand-deep);
}

.badge-recommended {
  border-color: var(--color-link);
  background: var(--color-link-soft);
  color: var(--color-text);
}

.badge-success {
  border-color: var(--color-success);
  background: var(--color-success-soft);
  color: var(--color-text);
}

.badge-warning,
.badge-archived {
  border-color: var(--color-warning);
  background: var(--color-warning-soft);
  color: var(--color-text);
}

.badge-danger {
  border-color: var(--color-danger);
  background: var(--color-danger-soft);
  color: var(--color-text);
}

.platform-row {
  justify-content: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.platform-link {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 550;
  text-decoration: none;
}

.platform-link:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.platform-link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.tab-browser {
  display: grid;
  grid-template-columns: minmax(210px, 0.7fr) minmax(0, 2fr);
  gap: clamp(22px, 4vw, 48px);
  align-items: stretch;
}

.tab-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tab-list [role="tab"] {
  position: relative;
  display: flex;
  width: 100%;
  min-height: 58px;
  align-items: center;
  padding: 13px 16px 13px 20px;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-text-muted);
  font-weight: 600;
  text-align: left;
}

.tab-list [role="tab"]::before {
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 0;
  width: var(--component-tab-line);
  border-radius: var(--radius-pill);
  background: var(--color-brand);
  content: "";
  opacity: 0;
}

.tab-list [role="tab"]::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--color-brand);
  content: "";
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
}

.tab-list [role="tab"]:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.tab-list [role="tab"][aria-selected="true"],
.tab-list [role="tab"].is-active {
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 750;
}

.tab-list [role="tab"][aria-selected="true"]::before,
.tab-list [role="tab"].is-active::before {
  opacity: 1;
}

.tab-list.is-auto [role="tab"][aria-selected="true"]::after {
  opacity: 1;
  animation: tab-progress var(--component-progress-time) linear forwards;
}

@keyframes tab-progress {
  to {
    transform: scaleX(1);
  }
}

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

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

.feature-panel {
  display: grid;
  min-height: 390px;
  grid-template-columns: minmax(0, 1.08fr) minmax(220px, 0.92fr);
  gap: 28px;
  padding: clamp(22px, 4vw, 38px);
  align-items: center;
  border: 1px solid var(--color-brand);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.feature-panel.tone-cyan {
  border-color: var(--color-link);
}

.feature-panel.tone-warning {
  border-color: var(--color-warning);
}

.feature-panel__demo {
  min-width: 0;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-ink-line);
  border-radius: var(--radius-medium);
  background: var(--color-ink);
  color: var(--color-ink-text);
  font: 500 13px/1.75 var(--font-mono);
}

.feature-panel__demo code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

.feature-panel__demo .syntax-key {
  color: var(--color-link);
}

.feature-panel__demo .syntax-value {
  color: var(--color-ink-text);
}

.feature-panel__demo .syntax-warn {
  color: var(--color-warning);
}

.feature-panel__copy p {
  color: var(--color-text-muted);
}

.switch-row {
  display: flex;
  min-width: 240px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-block: 9px;
  border-bottom: 1px solid var(--color-ink-line);
  color: var(--color-ink-text);
  font-family: var(--font-body);
}

.switch-track {
  position: relative;
  width: 38px;
  height: 22px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-ink-control);
}

.switch-track::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-pill);
  background: var(--color-ink-muted);
  content: "";
}

.switch-track.is-on {
  background: var(--color-brand);
}

.switch-track.is-on::after {
  left: 19px;
  background: var(--color-on-brand);
}

.toc-shell {
  position: sticky;
  z-index: 20;
  top: var(--header-height);
  width: calc(100% - var(--gutter) * 2);
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-block: 10px;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  color: var(--color-text);
}

.toc-tabs {
  display: flex;
  max-width: 100%;
  gap: 8px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-width: thin;
}

.toc-tabs a {
  display: inline-flex;
  min-height: 40px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.toc-tabs a:hover,
.toc-tabs a[aria-current="true"] {
  border-color: var(--color-brand);
  color: var(--color-brand-deep);
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: 0 8px 22px var(--color-shadow-soft);
}

.faq-item:nth-child(3n + 1) {
  border-color: var(--color-brand);
}

.faq-item:nth-child(3n + 2) {
  border-color: var(--color-link);
}

.faq-item:nth-child(3n) {
  border-color: var(--color-warning);
}

.faq-item summary {
  position: relative;
  display: flex;
  min-height: 60px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 54px 17px 20px;
  color: var(--color-text);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  position: absolute;
  top: 50%;
  right: 20px;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-muted);
  color: var(--color-text);
  content: "+";
  font: 700 17px/22px var(--font-body);
  text-align: center;
  transform: translateY(-50%);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 20px 20px;
  color: var(--color-text-muted);
}

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

.term-card {
  position: relative;
  min-height: 180px;
  padding: 24px;
  border: 1px solid var(--color-link);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.term-card::before {
  display: block;
  width: 30px;
  height: 3px;
  margin-bottom: 20px;
  border-radius: var(--radius-pill);
  background: var(--color-link);
  content: "";
}

.term-card h3 {
  font-size: 20px;
}

.term-card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.download-card {
  display: flex;
  min-height: 220px;
  flex-direction: column;
  gap: 17px;
  padding: 26px;
  border: 1px solid var(--color-link);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.download-card.is-featured {
  border-color: var(--color-brand);
}

.download-card.is-archived {
  border-color: var(--color-warning);
}

.download-card__head {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}

.download-card__icon {
  width: 54px;
  height: 54px;
  flex-shrink: 0;
}

.download-card__title {
  min-width: 0;
  flex: 1;
}

.download-card__title h3 {
  margin-bottom: 6px;
  font-size: 21px;
}

.download-card__description {
  color: var(--color-text-muted);
}

.download-card__actions {
  display: flex;
  margin-top: auto;
  flex-wrap: wrap;
  gap: 10px;
}

.version-slot:empty {
  display: none;
}

.version-slot:not(:empty) {
  display: inline-flex;
  color: var(--color-text-muted);
  font: 600 12px/1.3 var(--font-mono);
}

.post-card {
  display: flex;
  min-height: 270px;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.post-card:nth-child(3n + 1) {
  border-color: var(--color-brand);
}

.post-card:nth-child(3n + 2) {
  border-color: var(--color-link);
}

.post-card:nth-child(3n) {
  border-color: var(--color-warning);
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.post-card__meta {
  display: flex;
  margin-bottom: 18px;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  color: var(--color-text-muted);
  font: 600 12px/1.3 var(--font-mono);
}

.post-card h3 {
  font-size: 22px;
}

.post-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card p {
  color: var(--color-text-muted);
}

.post-card__link {
  display: inline-flex;
  min-height: 40px;
  margin-top: auto;
  align-items: center;
  color: var(--color-link);
  font-weight: 700;
  text-decoration: none;
}

.callout {
  position: relative;
  margin-block: 26px;
  padding: 20px 22px 20px 26px;
  border: 1px solid var(--color-link);
  border-radius: var(--radius-medium);
  background: var(--color-link-soft);
  color: var(--color-text);
}

.callout::before {
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 0;
  width: 4px;
  border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
  background: var(--color-link);
  content: "";
}

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

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

.callout-success {
  border-color: var(--color-success);
  background: var(--color-success-soft);
}

.callout-success::before {
  background: var(--color-success);
}

.callout-danger {
  border-color: var(--color-danger);
  background: var(--color-danger-soft);
}

.callout-danger::before {
  background: var(--color-danger);
}

.callout h3,
.callout h4 {
  margin-bottom: 7px;
}

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

.article-download {
  display: grid;
  margin-top: 48px;
  padding: clamp(22px, 4vw, 34px);
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  border: 1px solid var(--color-brand);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.article-download p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.dl-fab {
  position: fixed;
  z-index: 60;
  right: var(--component-fab-offset);
  bottom: var(--component-fab-offset);
  display: inline-flex;
  min-height: 58px;
  max-width: min(310px, calc(100vw - 32px));
  align-items: center;
  gap: 12px;
  padding: 10px 18px 10px 11px;
  border: 1px solid var(--color-brand);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  text-decoration: none;
}

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

.dl-fab__icon {
  display: grid;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-brand);
  color: var(--color-on-brand);
}

.dl-fab__icon svg {
  width: 18px;
  height: 18px;
}

.dl-fab__text {
  display: grid;
  gap: 2px;
}

.dl-fab__text strong {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.2;
}

.dl-fab__text span {
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.2;
}

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

.mock-window {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-brand);
  border-radius: var(--radius-medium);
  background: var(--color-ink);
  color: var(--color-ink-text);
  box-shadow: var(--shadow-card);
}

.mock-window__bar {
  display: grid;
  height: 40px;
  padding-inline: 14px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--color-ink-line);
  background: var(--color-ink-raised);
  color: var(--color-ink-muted);
}

.mock-window__dots {
  display: flex;
  gap: 7px;
}

.mock-window__dots i {
  width: 11px;
  height: 11px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-ink-control);
}

.mock-window__title {
  font-size: 13px;
  font-weight: 550;
  letter-spacing: 0.02em;
}

.mock-window__body {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
}

.mock-window__menu {
  display: flex;
  padding: 14px 10px;
  flex-direction: column;
  gap: 2px;
  border-right: 1px solid var(--color-ink-line);
}

.mock-window__menu span {
  position: relative;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--color-ink-muted);
  font-size: 13px;
}

.mock-window__menu .is-active {
  background: var(--color-ink-control);
  color: var(--color-ink-text);
  font-weight: 600;
}

.mock-window__menu .is-active::before {
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-brand);
  content: "";
}

.mock-window__pane {
  min-width: 0;
  padding: 20px 24px 18px;
}

.mock-window__label {
  margin-bottom: 10px;
  color: var(--color-ink-muted);
  font: 600 12px/1.2 var(--font-body);
  letter-spacing: 0.06em;
}

.segmented {
  display: inline-grid;
  margin-bottom: 20px;
  padding: 3px;
  grid-template-columns: repeat(3, minmax(76px, 96px));
  border-radius: var(--radius-small);
  background: var(--color-ink-control);
  color: var(--color-ink-muted);
}

.segmented span {
  display: grid;
  height: 30px;
  place-items: center;
  border-radius: 8px;
  font-size: 13px;
}

.segmented .is-active {
  background: var(--color-brand);
  color: var(--color-on-brand);
}

.mock-settings {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-ink-line);
  list-style: none;
}

.mock-settings li {
  display: flex;
  padding-block: 10px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--color-ink-line);
}

.mock-settings strong {
  display: block;
  color: var(--color-ink-text);
  font-size: 14px;
  line-height: 1.3;
}

.mock-settings small {
  display: block;
  margin-top: 3px;
  color: var(--color-ink-muted);
  font-size: 12px;
}

.mock-window__foot {
  display: flex;
  padding-top: 14px;
  flex-wrap: wrap;
  gap: 22px;
  color: var(--color-ink-muted);
  font: 400 12px/1.4 var(--font-mono);
}

.mock-window__foot b {
  color: var(--color-link);
  font-weight: 600;
}

@media (max-width: 800px) {
  .tab-browser {
    grid-template-columns: minmax(0, 1fr);
  }

  .tab-list {
    flex-direction: row;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    padding-bottom: 4px;
  }

  .tab-list [role="tab"] {
    width: auto;
    min-width: max-content;
    min-height: 44px;
    padding: 10px 15px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-pill);
    background: var(--color-surface);
  }

  .tab-list [role="tab"]::before {
    display: none;
  }

  .tab-list [role="tab"][aria-selected="true"] {
    border-color: var(--color-brand);
    color: var(--color-brand-deep);
  }

  .feature-panel {
    min-height: 0;
    grid-template-columns: minmax(0, 1fr);
  }

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

@media (max-width: 640px) {
  .chip-row,
  .badge-row,
  .platform-row {
    flex-direction: row;
    justify-content: center;
  }

  .mock-window__body {
    grid-template-columns: minmax(0, 1fr);
  }

  .mock-window__menu {
    flex-direction: row;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--color-ink-line);
  }

  .mock-window__menu span {
    flex: 0 0 auto;
  }

  .mock-window__menu .is-active::before {
    top: auto;
    right: 8px;
    bottom: 0;
    left: 8px;
    width: auto;
    height: 3px;
  }

  .mock-window__pane {
    padding: 18px 16px;
  }

  .segmented {
    display: grid;
    width: 100%;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .dl-fab {
    right: 16px;
    bottom: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tab-list.is-auto [role="tab"][aria-selected="true"]::after {
    animation: none;
  }
}