.tab-shell {
  display: grid;
  grid-template-columns: minmax(180px, 0.32fr) minmax(0, 1fr);
  gap: 30px;
  align-items: stretch;
}

.tab-list {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 8px;
}

.tab-list[role="tablist"] {
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
}

.tab-list [role="tab"] {
  position: relative;
  display: flex;
  width: 100%;
  min-height: 52px;
  align-items: center;
  gap: 10px;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-muted);
  padding: 12px 16px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 650;
  text-align: left;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.tab-list [role="tab"]::before {
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
  content: "";
  opacity: 0;
  transform: scaleY(0.4);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

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

.tab-list [role="tab"][aria-selected="true"],
.tab-list [role="tab"].is-active {
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-1);
}

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

.tab-panel {
  min-width: 0;
  min-height: 330px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-bg);
  padding: 42px;
  box-shadow: var(--shadow-2);
}

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

.tab-panel-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(150px, 0.38fr);
  gap: 36px;
  align-items: center;
}

.tab-panel-copy p {
  color: var(--color-text-muted);
  line-height: 1.9;
}

.tab-panel-visual {
  display: grid;
  min-height: 180px;
  place-items: center;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  color: var(--color-accent-dark);
}

.tab-panel-visual svg {
  width: min(150px, 80%);
  height: auto;
}

.toc {
  position: relative;
  display: flex;
  max-width: 100%;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 42px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
}

.toc-title {
  padding: 6px 10px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.toc a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text-muted);
  padding: 7px 12px;
  font-size: 13px;
}

.toc a:hover {
  color: var(--color-accent-dark);
}

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

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

.faq-item summary {
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
  cursor: pointer;
  color: var(--color-text);
  font-weight: 700;
  list-style: none;
}

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

.faq-item summary::after {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-accent-dark);
  content: "+";
  font-family: var(--font-mono);
  line-height: 26px;
  text-align: center;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.faq-item[open] summary::after {
  background: var(--color-accent-tint);
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 22px 22px;
  color: var(--color-text-muted);
}

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

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

.term-card {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  padding: 26px;
  box-shadow: var(--shadow-1);
}

.term-card::before {
  position: absolute;
  top: 26px;
  left: 0;
  width: 3px;
  height: 32px;
  border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
  background: var(--gradient-brand);
  content: "";
}

.term-card dt {
  margin-bottom: 8px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
}

.term-card dd {
  color: var(--color-text-muted);
  line-height: 1.8;
}

.term-code {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.download-grid {
  display: grid;
  gap: 20px;
}

.client-card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-bg);
  padding: 30px;
  box-shadow: var(--shadow-2);
}

.client-card-head {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 22px;
}

.client-card-icon {
  width: 54px;
  height: 54px;
  flex-shrink: 0;
}

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

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

.client-card-title p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.client-card-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.client-card-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.client-meta-item {
  min-width: 0;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  padding: 14px 16px;
}

.client-meta-label {
  display: block;
  margin-bottom: 4px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.client-meta-value {
  color: var(--color-text);
  font-size: 14px;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.client-badge {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 750;
  overflow: hidden;
}

.client-badge-primary {
  border-color: var(--color-accent);
  background: var(--color-accent-tint);
  color: var(--color-accent-dark);
}

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

.client-badge-retired {
  border-color: var(--color-error);
  background: var(--color-panel);
  color: var(--color-error);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.article-card {
  display: flex;
  min-width: 0;
  min-height: 100%;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  padding: 26px;
  box-shadow: var(--shadow-1);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.article-card:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-3px);
}

.article-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

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

.article-card p {
  color: var(--color-text-muted);
  font-size: 14px;
}

.article-card-link {
  margin-top: auto;
  padding-top: 14px;
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: 700;
}

.callout {
  position: relative;
  margin: 28px 0;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  padding: 20px 22px;
  color: var(--color-text-muted);
}

.callout strong,
.callout-title {
  color: var(--color-text);
}

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

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

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

.end-download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  margin-top: 56px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  padding: 30px;
  box-shadow: var(--shadow-1);
}

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

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

.dl-fab {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 45;
  display: inline-flex;
  max-width: calc(100vw - 32px);
  min-height: 52px;
  align-items: center;
  gap: 11px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 8px 18px 8px 9px;
  box-shadow: var(--shadow-3);
  font-size: 13px;
  font-weight: 750;
}

.dl-fab-icon {
  display: grid;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
  color: var(--color-bg);
}

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

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

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

.swatch {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  padding: 12px;
}

.swatch-color {
  height: 74px;
  margin-bottom: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

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

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

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

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

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

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

.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);
}

.swatch-gradient {
  background: var(--gradient-brand);
}

.swatch code {
  border: 0;
  background: transparent;
  padding: 0;
  font-size: 11px;
}

.type-sample {
  display: grid;
  gap: 26px;
}

.type-line {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.type-line:last-child {
  border-bottom: 0;
}

.component-table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  -webkit-overflow-scrolling: touch;
}

.component-table table {
  min-width: 680px;
}

.preview-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
}

@media (max-width: 960px) {
  .tab-shell {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .tab-list [role="tab"] {
    width: auto;
    min-width: 130px;
    flex: 0 0 auto;
  }

  .tab-list [role="tab"]::before {
    top: auto;
    right: 12px;
    bottom: 0;
    left: 12px;
    width: auto;
    height: 3px;
    transform: scaleX(0.4);
  }

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

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

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

@media (max-width: 640px) {
  .tab-panel {
    min-height: 0;
    padding: 24px 20px;
  }

  .tab-panel-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .tab-panel-visual {
    min-height: 140px;
  }

  .toc {
    align-items: stretch;
  }

  .toc-title {
    flex-basis: 100%;
  }

  .toc a {
    flex: 1 1 130px;
    justify-content: center;
    text-align: center;
  }

  .term-grid,
  .blog-grid,
  .client-card-meta,
  .palette-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .client-card {
    padding: 22px 18px;
  }

  .client-card-actions .button {
    width: 100%;
  }

  .end-download-card {
    grid-template-columns: minmax(0, 1fr);
    padding: 24px 20px;
  }

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

  .faq-item summary {
    padding: 16px 18px;
  }

  .faq-answer {
    padding: 0 18px 18px;
  }
}