.tab-strip {
  display: flex;
  width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
}
.tab-strip [role="tab"] {
  position: relative;
  flex: 1 0 0;
  min-width: 130px;
  min-height: 76px;
  padding: 16px 14px;
  border: 0;
  border-right: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-muted);
  font: 15px/1.5 var(--font-body);
  text-align: left;
}
.tab-strip [role="tab"]:last-child { border-right: 0; }
.tab-strip [role="tab"] small { display: block; margin-top: 5px; font: 11px/1.4 var(--font-mono); }
.tab-strip [role="tab"][aria-selected="true"] { color: var(--text); }
.tab-strip [role="tab"][aria-selected="true"]::before { content: ""; position: absolute; top: 0; left: 14px; width: 32px; height: 2px; background: var(--accent); }
.tab-strip [role="tab"]:focus-visible { outline-offset: -4px; }
.tab-panel { padding: 32px; border: 1px solid var(--border); border-top: 0; background: var(--bg-panel-2); color: var(--text); }
.feature-stage { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: 48px; align-items: center; min-height: 370px; }
.feature-copy h3 { margin-top: 0; }
.feature-copy p { color: var(--text-muted); font-size: 15px; line-height: 1.85; }
.setting-list { padding-left: 1.2em; font-size: 14px; }
.setting-list li + li { margin-top: 8px; }
.ui-window { border: 1px solid var(--border); border-radius: var(--radius-xs); background: var(--bg-panel); color: var(--text); box-shadow: var(--shadow-front); }
.ui-window .win-bar { border-radius: var(--radius-xs) var(--radius-xs) 0 0; }
.ui-window .opt { padding-inline: 20px; min-height: 54px; font-size: 14px; }
.ui-window .tabs { padding-inline: 20px; min-height: 40px; font-size: 12px; }
.ui-caption { margin: 16px 0 0; font-size: 12px; color: var(--text-muted); }
.toc {
  position: sticky;
  top: 0;
  z-index: 8;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding: 16px;
  margin-bottom: 40px;
  border-block: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
}
.toc a { display: inline-flex; align-items: center; min-height: 32px; font-size: 13px; text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.toc.is-static { position: static; }
.faq-item { border-bottom: 1px solid var(--border); background: var(--bg-panel); color: var(--text); }
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-item summary { position: relative; min-height: 64px; padding: 20px 48px 20px 20px; list-style: none; font-size: 16px; cursor: pointer; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; top: 19px; right: 20px; font: 22px/1 var(--font-mono); color: var(--text-muted); }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 20px 24px; color: var(--text-muted); }
.faq-answer p:last-child { margin-bottom: 0; }
.term-card { padding: 28px; border-top: 1px solid var(--border); background: var(--bg-panel); color: var(--text); }
.term-card h3 { margin: 12px 0 14px; font-size: 24px; }
.term-category { font: 11px/1.5 var(--font-mono); color: var(--text-muted); }
.term-card p { font-size: 14px; color: var(--text-muted); line-height: 1.85; }
.term-card a { font-size: 13px; }
.client-card { padding: 32px; border: 1px solid var(--border); border-radius: var(--radius-xs); background: var(--bg-panel); color: var(--text); box-shadow: var(--shadow-back); }
.client-head { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.app-logo { width: 56px; height: 56px; flex-shrink: 0; }
.client-title { flex: 1; min-width: 0; }
.client-title h3 { margin: 0 0 6px; }
.client-title p { margin: 0; font-size: 13px; color: var(--text-muted); }
.client-card .btn-row { margin-top: 24px; }
.client-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; font: 12px/1.6 var(--font-mono); color: var(--text-muted); }
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.badge { display: inline-flex; align-items: center; gap: 6px; max-width: 100%; padding: 4px 8px; border: 1px solid var(--border); border-radius: var(--radius-2xs); background: var(--bg-panel-2); color: var(--text); font-size: 11px; line-height: 1.4; overflow-wrap: anywhere; }
.badge-first { background: var(--text); color: var(--on-dark); border-color: var(--text); }
.badge-recommended { background: var(--bg-panel); color: var(--text); border-color: var(--border-strong); }
.badge-retired { background: var(--bg-panel-2); color: var(--text-muted); }
.status-dot { width: 5px; height: 5px; flex-shrink: 0; border-radius: var(--radius-round); background: var(--text); }
.article-card { display: flex; flex-direction: column; padding: 28px; border-top: 1px solid var(--border); background: var(--bg-panel); color: var(--text); }
.article-card h3 { margin: 20px 0 16px; font-size: 22px; line-height: 1.45; }
.article-card h3 a { text-decoration: none; }
.article-card h3 a:hover { text-decoration: underline; }
.article-card p { color: var(--text-muted); font-size: 14px; line-height: 1.8; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; font: 11px/1.5 var(--font-mono); color: var(--text-muted); }
.article-more { margin-top: auto; padding-top: 16px; font-size: 13px; }
.callout { margin: 28px 0; padding: 22px 24px; border: 1px solid var(--border); border-left: 3px solid var(--text); border-radius: var(--radius-2xs); background: var(--bg-panel-2); color: var(--text); }
.callout p:last-child { margin-bottom: 0; }
.callout-title { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.callout-note { border-left-color: var(--text-muted); }
.callout-warn { border-left-color: var(--warn); }
.callout-error { border-left-color: var(--error); }
.table-scroll { overflow-x: auto; max-width: 100%; min-width: 0; -webkit-overflow-scrolling: touch; overscroll-behavior-x: contain; }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--bg-panel); color: var(--text); }
.data-table th, .data-table td, .prose table th, .prose table td {
  min-width: 7em;
  padding: 14px 18px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  overflow-wrap: normal;
  word-break: normal;
}
.data-table th, .prose table th { font-weight: 500; background: var(--bg-panel-2); color: var(--text); }
.data-table caption { padding-bottom: 12px; text-align: left; font-size: 13px; color: var(--text-muted); }
.prose table {
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
  min-width: 0;
  border-collapse: collapse;
  background: var(--bg-panel);
  color: var(--text);
}
.dl-fab { position: fixed; right: max(20px, env(safe-area-inset-right)); bottom: max(20px, env(safe-area-inset-bottom)); z-index: 15; display: inline-flex; align-items: center; gap: 12px; max-width: calc(100% - 40px); padding: 14px 18px; border: 1px solid var(--text); border-radius: var(--radius-sm); background: var(--text); color: var(--on-dark); box-shadow: var(--shadow-back); text-decoration: none; font-size: 14px; }
.dl-fab svg { width: 20px; height: 20px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.dl-fab small { display: block; margin-top: 2px; font-size: 11px; }
.dl-fab:hover { background: var(--text-hover); color: var(--on-dark); }
.article-download { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-top: 56px; padding: 28px; border-block: 1px solid var(--border); background: var(--bg-panel-2); color: var(--text); }
.article-download h2 { margin: 0 0 8px; font-size: 24px; }
.article-download p { margin: 0; font-size: 14px; color: var(--text-muted); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; font-size: 12px; color: var(--text-muted); }
.breadcrumb a { text-decoration: none; }
.breadcrumb span[aria-hidden] { flex-shrink: 0; }

/* Preview-only specimen layout, with no inline presentation values. */
.specimen-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.swatch-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 36px; }
.swatch { margin: 0; }
.swatch-paint { display: block; height: 64px; border: 1px solid var(--border); border-radius: var(--radius-xs); }
.swatch figcaption { margin-top: 8px; font: 11px/1.6 var(--font-mono); color: var(--text); overflow-wrap: anywhere; }
.sw-bg { background: var(--bg); }
.sw-panel { background: var(--bg-panel); }
.sw-panel2 { background: var(--bg-panel-2); }
.sw-border { background: var(--border); }
.sw-border-strong { background: var(--border-strong); }
.sw-accent { background: var(--accent); }
.sw-accent-dark { background: var(--accent-dark); }
.sw-text { background: var(--text); }
.sw-hover { background: var(--text-hover); }
.sw-muted { background: var(--text-muted); }
.sw-faint { background: var(--text-faint); }
.sw-ghost { background: var(--text-ghost); }
.sw-success { background: var(--success); }
.sw-warn { background: var(--warn); }
.sw-error { background: var(--error); }
.sw-on-dark { background: var(--on-dark); }
.sw-marker { background: var(--marker-muted); }
.sw-term-bg { background: var(--term-bg); }
.sw-term-bar { background: var(--term-bar); }
.sw-term-edge { background: var(--term-edge); }
.sw-term-fg { background: var(--term-fg); }
.sw-term-out { background: var(--term-out); }
.sw-term-dim { background: var(--term-dim); }
.sw-clear { background: var(--clear); }
.type-display { margin-top: 0; font: 400 var(--size-h1)/1.14 var(--font-display); }
.specimen-row { margin-top: 28px; }
.preview-spacer { margin-top: 48px; }
@media (max-width: 900px) {
  .feature-stage { gap: 28px; grid-template-columns: minmax(0, 1fr); }
  .specimen-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .swatch-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .tab-strip [role="tab"] { flex: 0 0 140px; }
  .tab-panel { padding: 24px 20px; }
  .feature-stage { min-height: 0; }
  .specimen-grid { grid-template-columns: minmax(0, 1fr); }
  .swatch-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .term-card, .article-card { padding: 22px; }
  .client-card { padding: 24px 20px; }
  .client-head { align-items: flex-start; flex-wrap: wrap; }
  .article-download { flex-direction: column; align-items: flex-start; padding: 24px 20px; }
  .toc { position: static; gap: 8px 16px; }
  .ui-window .opt { font-size: 12px; padding-inline: 12px; }
  .dl-fab { right: 16px; bottom: 16px; padding: 12px 14px; }
  .dl-fab small { display: none; }
}