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

.tab-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-page);
  color: var(--color-ink);
}

.tab-button {
  position: relative;
  display: flex;
  min-height: 86px;
  min-width: 0;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-right: 1px solid var(--color-border);
  border-bottom: 3px solid transparent;
  background: var(--color-page);
  color: var(--color-ink-muted);
  padding: 16px;
  font-weight: 620;
  text-align: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.tab-button:last-child {
  border-right: 0;
}

.tab-button:hover {
  background: var(--color-panel);
  color: var(--color-ink);
}

.tab-button[aria-selected="true"],
.tab-button.is-active {
  border-bottom-color: var(--color-accent);
  background: var(--color-page);
  color: var(--color-ink);
}

.tab-button svg {
  width: 20px;
  height: 20px;
}

.tab-panel {
  margin-top: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-page);
  color: var(--color-ink);
  padding: clamp(24px, 4vw, 48px);
  box-shadow: var(--shadow-mid);
}

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

.tab-panel-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 44px;
  align-items: start;
}

.toc {
  position: sticky;
  z-index: 5;
  top: 16px;
  display: flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-low);
  padding: 6px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.toc a {
  display: inline-flex;
  min-height: 38px;
  flex: 0 0 auto;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 7px 13px;
  color: var(--color-ink-muted);
  font-size: 13px;
  font-weight: 580;
}

.toc a:hover,
.toc a.is-active {
  background: var(--color-panel);
  color: var(--color-ink);
}

.faq-list {
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-page);
  color: var(--color-ink);
}

.faq-item summary {
  position: relative;
  display: block;
  min-height: 68px;
  padding: 22px 50px 22px 0;
  color: var(--color-ink);
  font-size: 17px;
  font-weight: 650;
  list-style: none;
}

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

.faq-item summary::before,
.faq-item summary::after {
  position: absolute;
  top: 33px;
  right: 8px;
  width: 14px;
  height: 1px;
  background: var(--color-ink-muted);
  content: "";
}

.faq-item summary::after {
  transform: rotate(90deg);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(0);
}

.faq-answer {
  max-width: 820px;
  padding: 0 50px 24px 0;
  color: var(--color-ink-muted);
}

.term-card {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-page);
  color: var(--color-ink);
  padding: 24px;
  box-shadow: var(--shadow-low);
}

.term-card::before {
  position: absolute;
  top: 24px;
  left: 0;
  width: 3px;
  height: 28px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.term-card h3 {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 18px;
}

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

.client-card {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-page);
  color: var(--color-ink);
  padding: clamp(22px, 3vw, 32px);
  box-shadow: var(--shadow-card);
}

.client-card-header {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  gap: 16px;
}

.client-card-header img {
  width: 56px;
  height: 56px;
  flex: 0 0 auto;
}

.client-card-title {
  min-width: 0;
  flex: 1;
}

.client-card-title h2,
.client-card-title h3 {
  margin-bottom: 5px;
}

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

.client-downloads {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.client-downloads .button {
  width: 100%;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.badge {
  display: inline-flex;
  min-height: 27px;
  max-width: 100%;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-ink);
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 650;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

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

.badge-recommended {
  border-color: var(--color-accent);
  background: var(--color-page);
  color: var(--color-accent-dark);
}

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

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

.badge-warning {
  border-color: var(--color-warning);
  background: var(--color-page);
  color: var(--color-ink);
}

.article-card {
  display: flex;
  min-width: 0;
  height: 100%;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-page);
  color: var(--color-ink);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: var(--shadow-low);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-bottom: 18px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.article-card h3 {
  margin-bottom: 14px;
  font-size: 21px;
}

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

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: auto;
  color: var(--color-accent-dark);
  font-size: 14px;
  font-weight: 650;
}

.callout {
  position: relative;
  margin-block: 28px;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  color: var(--color-ink);
  padding: 20px 22px;
}

.callout strong:first-child {
  display: block;
  margin-bottom: 5px;
  color: var(--color-ink);
}

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

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

.callout-success {
  border-left-color: var(--color-success);
  background: var(--color-panel);
  color: var(--color-ink);
}

.download-guide-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  margin-top: 56px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  color: var(--color-ink);
  padding: clamp(24px, 4vw, 38px);
}

.download-guide-card h2,
.download-guide-card h3 {
  margin-bottom: 8px;
}

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

.dl-fab {
  position: fixed;
  z-index: 80;
  right: 28px;
  bottom: 28px;
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-fab);
  padding: 9px 18px 9px 14px;
  font-size: 14px;
  font-weight: 680;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.dl-fab:hover {
  border-color: var(--color-ink-muted);
  box-shadow: var(--shadow-card);
}

.dl-fab svg {
  width: 17px;
  height: 17px;
  color: var(--color-accent);
}

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

.mini-ui {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-panel), var(--color-page));
  color: var(--color-ink);
  padding: 14px;
}

.mini-rule {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding-block: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.mini-rule:last-child {
  border-bottom: 0;
}

.mini-radio {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-block: 5px;
  color: var(--color-ink-muted);
  font-size: 12px;
}

.mini-radio::before {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-page);
  content: "";
}

.mini-radio.is-selected {
  color: var(--color-ink);
  font-weight: 620;
}

.mini-radio.is-selected::before {
  border: 4px solid var(--color-accent);
}

@media (max-width: 768px) {
  .tab-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tab-button {
    min-height: 68px;
    border-bottom: 1px solid var(--color-border);
  }

  .tab-button:nth-child(2n) {
    border-right: 0;
  }

  .tab-button[aria-selected="true"],
  .tab-button.is-active {
    box-shadow: inset 0 -3px var(--color-accent);
  }

  .tab-panel-layout {
    grid-template-columns: 1fr;
    gap: 26px;
  }

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

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

  .download-guide-card .button {
    width: 100%;
  }

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

@media (max-width: 480px) {
  .tab-button {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    font-size: 13px;
    text-align: left;
  }

  .faq-item summary {
    padding-right: 40px;
    font-size: 16px;
  }

  .faq-answer {
    padding-right: 8px;
  }

  .dl-fab {
    min-height: 44px;
    padding: 8px 14px 8px 12px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-card:hover {
    transform: none;
  }
}