.feature-console {
  display: grid;
  grid-template-columns: minmax(190px, .72fr) minmax(0, 2.1fr);
  gap: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-banner);
  background: var(--color-surface);
  color: var(--color-text);
  padding: clamp(18px, 3vw, 32px);
  box-shadow: var(--shadow-card);
}

.tab-list {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 4px;
}

.tab-list[role="tablist"] {
  align-items: stretch;
}

.tab-button {
  position: relative;
  display: flex;
  width: 100%;
  min-height: 50px;
  align-items: center;
  border: 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: transparent;
  color: var(--color-text-muted);
  padding: 11px 14px 11px 18px;
  font-weight: 600;
  text-align: left;
}

.tab-button::before {
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 4px;
  border-radius: var(--radius-pill);
  background: transparent;
  content: "";
}

.tab-button:hover {
  background: var(--color-canvas);
  color: var(--color-text);
}

.tab-button[aria-selected="true"],
.tab-button.active {
  background: var(--color-canvas);
  color: var(--color-text);
  font-weight: 800;
}

.tab-button[aria-selected="true"]::before,
.tab-button.active::before {
  background: var(--color-accent);
}

.tab-panel {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  padding: clamp(24px, 4vw, 42px);
}

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

.tab-panel-head {
  display: flex;
  margin-bottom: 18px;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.tab-panel-version {
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: .75rem;
}

.platform-tabs {
  display: flex;
  max-width: 100%;
  gap: 8px;
  overflow-x: auto;
  padding: 4px;
  scrollbar-width: thin;
}

.platform-tabs .tab-button {
  width: auto;
  min-width: max-content;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 10px 17px;
}

.platform-tabs .tab-button::before {
  display: none;
}

.platform-tabs .tab-button[aria-selected="true"] {
  border-color: var(--color-accent-strong);
  background: var(--color-accent);
  color: var(--color-ink-panel);
}

.toc-tabs {
  position: sticky;
  z-index: 20;
  top: 10px;
  display: flex;
  max-width: 100%;
  gap: 8px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-text);
  padding: 7px;
  box-shadow: var(--shadow-card);
  scrollbar-width: thin;
}

.toc-tabs a {
  display: inline-flex;
  min-width: max-content;
  min-height: 40px;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  color: var(--color-text-muted);
  font-size: .88rem;
  font-weight: 650;
  text-decoration: none;
}

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

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

.faq-item {
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
}

.faq-item summary {
  display: flex;
  min-height: 62px;
  cursor: pointer;
  list-style: none;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  color: var(--color-text);
  font-weight: 750;
}

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

.faq-item summary::after {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  border-right: 2px solid var(--color-text);
  border-bottom: 2px solid var(--color-text);
  content: "";
  transform: rotate(45deg);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(225deg);
}

.faq-answer {
  border-top: 1px solid var(--color-border);
  padding: 18px 20px 22px;
  color: var(--color-text-muted);
}

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

.term-card {
  position: relative;
  overflow-x: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 26px;
  box-shadow: var(--shadow-card);
}

.term-card::after {
  position: absolute;
  top: 0;
  right: 24px;
  width: 52px;
  height: 5px;
  border-radius: 0 0 var(--radius-pill) var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.term-card dt {
  margin-bottom: 9px;
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 800;
}

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

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

.download-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-canvas);
  color: var(--color-text);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: var(--shadow-card);
}

.download-card-head {
  display: flex;
  min-width: 0;
  margin-bottom: 18px;
  align-items: flex-start;
  gap: 14px;
}

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

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

.download-card-title h3 {
  overflow-wrap: anywhere;
}

.download-card-body {
  flex: 1;
  color: var(--color-text-muted);
}

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

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

.version-slot:not(:empty) {
  display: inline-flex;
  margin-top: 8px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: .78rem;
}

.client-badge {
  display: inline-flex;
  max-width: 100%;
  min-height: 26px;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 4px 9px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .72rem;
  font-weight: 750;
  line-height: 1.25;
}

.client-badge--top,
.client-badge--recommended {
  border-color: var(--color-accent-strong);
  background: var(--color-accent);
  color: var(--color-ink-panel);
}

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

.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-canvas);
  color: var(--color-text);
  padding: 25px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 2px 4px var(--color-shadow-soft), 0 18px 36px -12px var(--color-shadow-mid);
}

.post-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-bottom: 15px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: .74rem;
}

.post-card h3 {
  font-size: 1.15rem;
}

.post-card p {
  flex: 1;
  color: var(--color-text-muted);
  font-size: .92rem;
}

.post-card-link {
  margin-top: 16px;
  color: var(--color-accent-strong);
  font-weight: 750;
  text-decoration: none;
}

.callout {
  position: relative;
  overflow-x: clip;
  border: 1px solid var(--color-border);
  border-left: 5px solid var(--color-accent-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 19px 22px;
}

.callout strong:first-child {
  display: block;
  margin-bottom: 4px;
}

.callout--success {
  border-left-color: var(--color-success);
  background: var(--color-success-wash);
  color: var(--color-text);
}

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

.callout--error {
  border-left-color: var(--color-error);
  background: var(--color-error-wash);
  color: var(--color-text);
}

.dl-fab {
  position: fixed;
  z-index: 50;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  display: inline-flex;
  max-width: min(310px, calc(100vw - 36px));
  min-height: 64px;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-accent-strong);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-ink-panel);
  padding: 10px 20px 10px 11px;
  box-shadow: var(--shadow-button);
  font-weight: 800;
  line-height: 1.25;
  text-decoration: none;
}

.dl-fab-icon {
  display: inline-flex;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--color-ink-panel);
  color: var(--color-accent);
}

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

.article-download-card {
  display: grid;
  margin-top: 48px;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  color: var(--color-text);
  padding: clamp(24px, 4vw, 36px);
  box-shadow: var(--shadow-card);
}

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

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

.preview-hero {
  min-height: calc(100svh - var(--header-height) - 46px);
  display: grid;
  align-content: center;
  gap: 22px;
  padding-top: 6px;
  padding-bottom: 10px;
}

.migration-banner {
  position: relative;
  display: grid;
  min-height: 520px;
  overflow: hidden;
  grid-template-columns: 42fr 58fr;
  align-items: center;
  gap: 48px;
  border-radius: var(--radius-banner);
  background: radial-gradient(72% 118% at 76% 44%, var(--color-ink-lift) 0%, transparent 62%), linear-gradient(128deg, var(--color-ink-deep) 0%, var(--color-ink-panel) 52%);
  color: var(--color-on-dark);
  padding: 52px 56px 48px;
  box-shadow: inset 0 1px 0 var(--color-banner-topline), var(--shadow-banner);
}

.migration-copy {
  position: relative;
  z-index: 2;
}

.migration-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 0;
  color: var(--color-on-dark-soft);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
}

.migration-banner h1 {
  margin: 18px 0 0;
  color: var(--color-on-dark);
  font-size: clamp(34px, 3.3vw, 44px);
  line-height: 1.18;
}

.migration-banner h1 span {
  display: block;
}

.migration-lead {
  max-width: 29em;
  margin-top: 18px;
  color: var(--color-on-dark-soft);
  font-size: .92rem;
  line-height: 1.72;
}

.migration-lead strong {
  color: var(--color-on-dark);
}

.migration-banner .button-row {
  margin-top: 28px;
}

.migration-chips {
  margin-top: 32px;
}

.migration-chips .chip {
  border-color: var(--color-chip-border);
  background: transparent;
  color: var(--color-chip-text);
  font-family: var(--font-mono);
  font-size: .72rem;
}

.migration-figure {
  min-width: 0;
}

.migration-figure svg {
  width: 100%;
  height: auto;
}

.diagram-frame {
  stroke: var(--color-guide-faint);
  stroke-width: 1;
}

.diagram-guide {
  stroke: var(--color-guide);
  stroke-width: 1.5;
  stroke-dasharray: 2 8;
  stroke-linecap: round;
}

.diagram-old {
  fill: none;
  stroke: var(--color-line-ghost);
  stroke-width: 1.6;
  stroke-linejoin: round;
}

.diagram-chord {
  stroke: var(--color-line-ghost);
  stroke-width: .9;
  opacity: .5;
}

.diagram-node {
  fill: var(--color-line-ghost);
}

.diagram-old-core {
  fill: none;
  stroke: var(--color-line-ghost);
  stroke-width: 1.1;
}

.diagram-old-label {
  fill: var(--color-on-dark-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 1.5px;
}

.diagram-stem {
  stroke: var(--color-stem);
  stroke-width: 1.5;
}

.diagram-tag {
  fill: var(--color-tag-bg);
  stroke: var(--color-tag-border);
}

.diagram-tag-text {
  fill: var(--color-tag-text);
  font-family: var(--font-mono);
  font-size: 11px;
  text-anchor: middle;
}

.diagram-arrow {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 12;
  stroke-linecap: round;
}

.diagram-arrow-head,
.diagram-core {
  fill: var(--color-accent);
}

.diagram-rivet {
  fill: var(--color-arrow-rivet);
}

.diagram-ring {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1.4;
  opacity: .45;
}

.diagram-ring-faint {
  fill: none;
  stroke: var(--color-accent);
  opacity: .14;
}

.diagram-core-title {
  fill: var(--color-ink-panel);
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: 4px;
  text-anchor: middle;
}

.diagram-core-sub {
  fill: var(--color-ink-panel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-anchor: middle;
}

.diagram-legend {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-inline: 8px;
  color: var(--color-on-dark-faint);
  font-family: var(--font-mono);
  font-size: .71rem;
}

.diagram-legend strong {
  color: var(--color-accent);
  font-weight: 600;
}

.hero-support-band {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 36px;
}

.support-group {
  display: grid;
  gap: 10px;
}

.support-label {
  margin: 0;
  color: var(--color-text-muted);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .14em;
}

.platform-row,
.region-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.platform-link,
.region-chip {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  color: var(--color-text);
  font-size: .84rem;
  font-weight: 650;
  text-decoration: none;
}

.platform-link {
  background: var(--color-canvas);
  box-shadow: var(--shadow-card);
}

.platform-link:hover {
  border-color: var(--color-accent-strong);
  transform: translateY(-2px);
}

.platform-link svg {
  width: 15px;
  height: 15px;
}

.region-chip {
  background: var(--color-surface);
}

.mini-flag {
  width: 25px;
  height: 18px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: 5px;
}

.flag-red {
  fill: var(--color-flag-red);
}

.flag-blue {
  fill: var(--color-flag-blue);
}

.flag-navy {
  fill: var(--color-flag-navy);
}

.flag-white {
  fill: var(--color-flag-white);
}

.flag-yellow {
  fill: var(--color-flag-yellow);
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.swatch {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-text);
}

.swatch-color {
  height: 86px;
}

.swatch-body {
  padding: 13px;
}

.swatch-body strong,
.swatch-body code {
  display: block;
}

.swatch-body code {
  margin-top: 4px;
  padding: 0;
  background: transparent;
  color: var(--color-text-muted);
}

.swatch-canvas {
  background: var(--color-canvas);
}

.swatch-surface {
  background: var(--color-surface);
}

.swatch-ink {
  background: var(--color-ink-panel);
}

.swatch-border {
  background: var(--color-border);
}

.swatch-accent {
  background: var(--color-accent);
}

.swatch-accent-strong {
  background: var(--color-accent-strong);
}

.swatch-text {
  background: var(--color-text);
}

.swatch-muted {
  background: var(--color-text-muted);
}

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

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

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

.preview-block {
  margin-bottom: 30px;
}

@media (max-width: 1040px) {
  .migration-banner {
    min-height: 0;
    grid-template-columns: 1fr;
    padding: 42px 34px;
  }

  .migration-figure {
    max-width: 740px;
    margin-inline: auto;
  }

  .hero-support-band {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .palette-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .feature-console {
    grid-template-columns: 1fr;
  }

  .tab-list {
    flex-direction: row;
    overflow-x: auto;
  }

  .tab-list .tab-button {
    width: auto;
    min-width: max-content;
    border-radius: var(--radius-pill);
    padding-inline: 16px;
  }

  .tab-list .tab-button::before {
    display: none;
  }

  .tab-list .tab-button[aria-selected="true"] {
    background: var(--color-accent);
    color: var(--color-ink-panel);
  }

  .download-grid,
  .glossary-grid,
  .post-grid {
    grid-template-columns: 1fr;
  }

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

  .migration-banner {
    gap: 30px;
    border-radius: var(--radius-card);
    padding: 34px 24px;
  }

  .migration-banner h1 {
    font-size: clamp(24px, 7.5vw, 30px);
  }

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

@media (max-width: 480px) {
  .palette-grid {
    grid-template-columns: 1fr;
  }

  .tab-panel-head {
    flex-direction: column;
    gap: 6px;
  }

  .migration-banner {
    padding: 30px 20px;
  }

  .migration-figure {
    margin-inline: -8px;
  }

  .diagram-legend {
    font-size: .62rem;
  }

  .platform-link,
  .region-chip {
    padding-inline: 11px;
  }

  .dl-fab {
    right: 12px;
    bottom: 12px;
    max-width: calc(100vw - 24px);
  }
}