:root {
  --component-track-width: 2px;
  --component-node-size: 13px;
  --component-icon-size: 48px;
}

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

.tab-list {
  display: flex;
  max-width: 100%;
  gap: 6px;
  padding: 6px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-panel);
  color: var(--color-text);
  scrollbar-width: thin;
}

.tab-list [role="tab"] {
  min-height: 42px;
  flex: 0 0 auto;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-text-muted);
  font-weight: 700;
  white-space: nowrap;
}

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

.tab-list [role="tab"][aria-selected="true"] {
  border-color: var(--color-line);
  background: var(--color-canvas);
  color: var(--color-accent-deep);
  box-shadow: 0 1px 2px var(--color-shadow-faint);
}

.tab-panel {
  padding-top: 28px;
}

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

.jump-toc {
  position: sticky;
  top: 12px;
  z-index: 5;
  display: flex;
  max-width: 100%;
  gap: 7px;
  padding: 8px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  scrollbar-width: thin;
}

.jump-toc a {
  min-height: 38px;
  flex: 0 0 auto;
  padding: 7px 12px;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.jump-toc a:hover {
  background: var(--color-panel);
  color: var(--color-accent-deep);
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: 0 1px 2px var(--color-shadow-faint);
}

.faq-item summary {
  position: relative;
  display: flex;
  min-height: 58px;
  align-items: center;
  gap: 12px;
  padding: 16px 50px 16px 18px;
  cursor: pointer;
  font-weight: 750;
  list-style: none;
}

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

.faq-item summary::before {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.faq-item summary::after {
  position: absolute;
  right: 20px;
  color: var(--color-accent-deep);
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
}

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

.faq-answer {
  padding: 0 20px 18px 38px;
  color: var(--color-text-muted);
}

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

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.glossary-card {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: 0 1px 2px var(--color-shadow-faint);
}

.glossary-card dt {
  margin-bottom: 8px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.glossary-card dd {
  margin: 0;
  color: var(--color-text-muted);
}

.download-card {
  position: relative;
  min-width: 0;
  padding: clamp(22px, 4vw, 32px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
}

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

.download-card-head img {
  width: var(--component-icon-size);
  height: var(--component-icon-size);
  flex-shrink: 0;
}

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

.download-card-copy h2,
.download-card-copy h3 {
  overflow-wrap: anywhere;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.badge {
  display: inline-flex;
  min-height: 26px;
  max-width: 100%;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 12px;
  font-weight: 750;
  line-height: 1.2;
}

.badge::before {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.badge-featured {
  border-color: var(--color-accent);
  background: var(--color-accent-wash);
  color: var(--color-accent-deep);
}

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

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

.badge-retired {
  border-color: var(--color-line);
  background: var(--color-panel-strong);
  color: var(--color-text-muted);
}

.badge-retired::before {
  background: var(--color-text-muted);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.article-card {
  display: flex;
  min-width: 0;
  min-height: 100%;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: 0 1px 2px var(--color-shadow-faint);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.article-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

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

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

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

.article-card .text-link {
  margin-top: auto;
  align-self: flex-start;
}

.callout {
  position: relative;
  padding: 20px 22px 20px 48px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-card);
  background: var(--color-accent-wash);
  color: var(--color-text);
}

.callout::before {
  position: absolute;
  top: 24px;
  left: 22px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-deep);
  content: "";
}

.callout strong,
.callout h2,
.callout h3,
.callout h4 {
  color: var(--color-text);
}

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

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

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

.feature-rail {
  position: relative;
  display: grid;
  gap: 0;
  margin-left: 8px;
}

.feature-rail::before {
  position: absolute;
  top: 22px;
  bottom: 22px;
  left: 6px;
  width: var(--component-track-width);
  background: var(--color-accent);
  content: "";
}

.feature-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(120px, 190px) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 64px);
  padding: 34px 0 34px 38px;
  border-bottom: 1px solid var(--color-line);
}

.feature-item:last-child {
  border-bottom: 0;
}

.feature-item::before {
  position: absolute;
  top: 42px;
  left: 0;
  width: var(--component-node-size);
  height: var(--component-node-size);
  border: 3px solid var(--color-canvas);
  border-radius: var(--radius-pill);
  background: var(--color-accent-deep);
  box-shadow: 0 0 0 1px var(--color-accent);
  content: "";
  transition: box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.feature-item:hover::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent), 0 0 18px var(--color-accent-halo);
}

.feature-label {
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.feature-copy p {
  max-width: 62em;
  color: var(--color-text-muted);
}

.platform-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.platform-chip {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 9px;
  padding: 8px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text-muted);
  font-weight: 650;
  box-shadow: 0 1px 2px var(--color-shadow-faint);
  transition: color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.platform-chip svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.platform-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
}

.end-download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  margin-top: 52px;
  padding: 26px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-panel);
  color: var(--color-text);
}

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

.dl-fab {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 80;
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-dark);
  color: var(--color-on-dark);
  font-size: 14px;
  font-weight: 750;
  box-shadow: 0 4px 18px var(--color-shadow-dark);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.dl-fab svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.dl-fab:hover {
  background: var(--color-accent-deep);
  color: var(--color-on-dark);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .glossary-grid,
  .article-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .feature-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

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

@media (max-width: 640px) {
  .jump-toc {
    top: 6px;
  }

  .faq-answer {
    padding-left: 20px;
  }

  .platform-strip {
    flex-direction: row;
  }

  .platform-chip {
    flex: 0 1 auto;
    padding-inline: 12px;
  }

  .download-card-head {
    align-items: center;
  }

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