:root {
  --component-focus-ring: 0 0 0 3px var(--color-panel-warm);
  --component-success-soft: rgba(59, 165, 92, 0.12);
  --component-error-soft: rgba(222, 75, 62, 0.1);
  --component-warning-soft: rgba(232, 161, 59, 0.14);
}

/* Tabs */
.tabs {
  min-width: 0;
}

.tab-list {
  display: flex;
  max-width: 100%;
  gap: 6px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  padding: 5px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

[role="tab"] {
  min-height: 42px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  color: var(--color-muted);
  font-weight: 650;
  white-space: nowrap;
}

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

[role="tab"][aria-selected="true"],
[role="tab"].is-active {
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

[role="tab"]:focus-visible,
.button:focus-visible,
.faq-question:focus-visible,
.toc-nav a:focus-visible,
.dl-fab:focus-visible {
  outline: none;
  box-shadow: var(--component-focus-ring);
}

[role="tabpanel"] {
  min-width: 0;
  padding-top: 28px;
}

[role="tabpanel"][hidden] {
  display: none;
}

/* Long-page category navigation */
.toc-nav {
  position: sticky;
  z-index: 20;
  top: 12px;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 6px;
  box-shadow: var(--shadow-soft);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.toc-nav ul {
  display: flex;
  min-width: max-content;
  gap: 4px;
  list-style: none;
}

.toc-nav a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 8px 15px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 650;
}

.toc-nav a:hover,
.toc-nav a[aria-current="true"] {
  background: var(--color-panel);
  color: var(--color-text);
}

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

.faq-item {
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-block);
  background: var(--color-bg);
  color: var(--color-text);
}

.faq-question {
  display: flex;
  width: 100%;
  min-height: 60px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
  color: var(--color-text);
  text-align: left;
  font-weight: 700;
}

.faq-question::after {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  content: "+";
  font-family: var(--font-mono);
  line-height: 20px;
  text-align: center;
}

.faq-item[open] .faq-question::after,
.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  border-top: 1px solid var(--color-border);
  padding: 18px 20px 20px;
  color: var(--color-muted);
}

details.faq-item summary {
  list-style: none;
}

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

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

.term-card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.term-card dt,
.term-card h3 {
  margin-bottom: 9px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 750;
}

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

.term-alias {
  display: inline-flex;
  max-width: 100%;
  margin-top: 14px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text);
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Download client cards */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.download-card {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.download-card.is-featured {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
}

.download-card-head {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  gap: 14px;
}

.download-card-icon {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
}

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

.download-card p {
  margin-top: 12px;
  color: var(--color-muted);
}

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

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

.version-slot:not(:empty) {
  display: inline-flex;
  margin-top: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

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

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

.badge-featured {
  border-color: var(--color-accent);
  background: var(--color-panel-warm);
  color: var(--color-accent-ink);
}

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

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

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

/* Blog cards */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.post-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

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

.post-card h3 {
  font-size: 19px;
}

.post-card p {
  margin-top: 12px;
  color: var(--color-muted);
}

.post-card-link {
  display: inline-flex;
  align-items: center;
  margin-top: auto;
  padding-top: 20px;
  color: var(--color-accent-ink);
  font-weight: 700;
}

/* Callouts */
.callout {
  position: relative;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-block);
  background: var(--color-panel-warm);
  color: var(--color-text);
  padding: 18px 20px;
}

.callout-title {
  display: block;
  margin-bottom: 5px;
  font-weight: 750;
}

.callout p,
.callout li {
  color: var(--color-text);
}

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

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

.callout-error {
  border-left-color: var(--color-error);
  background: var(--component-error-soft);
}

/* End-of-article download card */
.article-download-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  margin-top: 48px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-panel);
  background: var(--color-panel);
  color: var(--color-text);
  padding: clamp(22px, 4vw, 34px);
}

.article-download-card p {
  margin-top: 6px;
  color: var(--color-muted);
}

/* Persistent download guide used on blog articles only */
.dl-fab {
  position: fixed;
  z-index: 80;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  display: flex;
  max-width: min(310px, calc(100vw - 32px));
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-card);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 12px 16px 12px 12px;
  box-shadow: var(--shadow-menu);
}

.dl-fab-icon {
  display: grid;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  color: var(--color-bg);
}

.dl-fab-icon svg {
  width: 17px;
  height: 17px;
}

.dl-fab-copy {
  min-width: 0;
}

.dl-fab-copy strong,
.dl-fab-copy span {
  display: block;
}

.dl-fab-copy strong {
  font-size: 14px;
}

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

/* Feature comparison */
.compare-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-panel);
}

.compare-pane {
  background: var(--color-bg);
  color: var(--color-text);
  padding: clamp(28px, 5vw, 56px);
}

.compare-pane + .compare-pane {
  border-left: 1px solid var(--color-border);
  background: var(--color-panel);
}

.compare-list {
  display: grid;
  gap: 18px;
  margin-top: 28px;
  list-style: none;
}

.compare-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.compare-mark {
  display: grid;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  place-items: center;
  border-radius: var(--radius-pill);
  font-weight: 800;
}

.compare-mark.is-negative {
  background: var(--component-error-soft);
  color: var(--color-error);
}

.compare-mark.is-positive {
  background: var(--component-success-soft);
  color: var(--color-success);
}

/* Alternating long feature rows */
.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  align-items: center;
  gap: clamp(36px, 7vw, 88px);
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.feature-row.is-reversed .feature-copy {
  order: 2;
}

.feature-copy p {
  margin-top: 18px;
  color: var(--color-muted);
}

.mini-interface {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.mini-interface-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
}

.mini-interface-row {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--color-border);
  padding: 14px 2px;
}

.mini-interface-row:first-of-type {
  border-top: 0;
}

.mini-interface-value {
  margin-left: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text);
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
}

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

@media (max-width: 900px) {
  .post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature-row {
    grid-template-columns: 1fr;
  }

  .feature-row.is-reversed .feature-copy {
    order: initial;
  }
}

@media (max-width: 700px) {
  .glossary-grid,
  .download-grid,
  .post-grid,
  .compare-split {
    grid-template-columns: 1fr;
  }

  .compare-pane + .compare-pane {
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

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

@media (max-width: 640px) {
  .tab-list {
    border-radius: var(--radius-block);
  }

  [role="tab"] {
    padding-inline: 14px;
  }

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

  .faq-question,
  .faq-answer {
    padding-inline: 16px;
  }

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

  .download-card,
  .term-card,
  .post-card {
    padding: 20px;
  }
}