/* DUX-0102. Opt-in shell only: article/Lab styles keep their own migration scope. */
.dux-v1 {
  --text:var(--dux-ink); --text-muted:var(--dux-muted); --border:var(--dux-line);
  --blue:var(--dux-action); --ui-tone:var(--dux-action);
  color:var(--dux-ink); background:var(--dux-surface); font:1rem/1.5 var(--dux-font); color-scheme:light;
}
.dux-shell {border-bottom:1px solid var(--dux-line)}
.dux-header {display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:0 32px;max-width:var(--dux-wide);margin:auto;padding:12px 32px 0}
.dux-brand {grid-column:1;grid-row:1;font-size:1.625rem;font-weight:800;letter-spacing:-.04em;text-decoration:none;min-height:44px;display:flex;align-items:center;color:var(--dux-ink)}
.dux-brand span {color:var(--dux-action)}
.dux-search {grid-column:3;grid-row:1;display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--dux-control);border-radius:8px;min-height:44px;color:var(--dux-ink);font-size:1rem;text-decoration:none}
.dux-search {min-width:44px}
.dux-search svg {width:20px;height:20px;flex-shrink:0}
.dux-menu,.dux-menu-panel {display:contents}
.dux-menu>summary {display:none}
.dux-primary {grid-column:2;grid-row:1;display:flex;justify-content:center;gap:24px;flex-wrap:wrap}
.dux-primary a,.dux-utility>a {display:flex;align-items:center;min-height:44px;color:var(--dux-ink);text-decoration:none;padding:8px 0;overflow-wrap:anywhere}
.dux-primary [aria-current] {color:var(--dux-action);text-decoration:underline;text-underline-offset:8px;text-decoration-thickness:2px}
.dux-utility {grid-column:1/-1;grid-row:2;display:flex;justify-content:flex-end;align-items:center;flex-wrap:wrap;gap:8px 24px;border-top:1px solid var(--dux-line);margin-top:12px;padding:4px 0;font-size:.875rem}
.dux-utility>a {color:var(--dux-muted)}
.dux-utility .auth-guest,.dux-utility .auth-user {flex-wrap:wrap;justify-content:flex-start;padding:0;border:0}
.dux-utility .auth-link {min-height:44px;border-radius:8px;font-size:.875rem;padding:8px 12px}
.dux-utility .auth-link-primary {color:var(--dux-action);background:var(--dux-surface);border-color:var(--dux-control)}
.dux-utility .auth-greeting {white-space:normal;overflow-wrap:anywhere}
.dux-utility .locale-picker {position:relative;font:inherit;max-width:100%}
.dux-utility .locale-picker summary {min-height:44px;padding:10px 12px;border:1px solid var(--dux-control);border-radius:8px;color:var(--dux-ink);cursor:pointer}
.dux-utility .locale-picker ul {position:absolute;right:0;top:100%;z-index:60;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:min(400px,calc(100vw - 40px));max-height:60dvh;overflow-y:auto;list-style:none;margin:8px 0;padding:12px;background:var(--dux-surface);border:1px solid var(--dux-control);border-radius:8px;box-shadow:0 8px 24px #18262d18}
.dux-utility .locale-picker li {min-width:0;margin:0}
.dux-utility .locale-picker a {display:flex;align-items:center;min-height:44px;padding:8px;color:var(--dux-ink);white-space:normal;overflow-wrap:anywhere;text-decoration:none}
.dux-utility .locale-picker [aria-current] {color:var(--dux-action);text-decoration:underline;text-underline-offset:4px}
.dux-v1 :is(a,button,summary):hover {text-decoration:underline;text-underline-offset:4px}
.dux-shell-site :is(.dux-v1 a,.dux-v1 button,.dux-v1 summary,.dux-skip):focus-visible {outline:3px solid #b45309;outline-offset:4px}
.dux-skip {font-size:1rem;color:#18262d;min-height:44px;border:1px solid #72808a}
.dux-bottom {display:none}
.dux-shell-site .dux-footer {background:#f5f4ef;border-color:#dce1df;color:#54616b}
.dux-footer .wrap {display:flex;gap:16px;flex-wrap:wrap;justify-content:space-between;padding-block:24px}
.dux-footer a {display:inline-flex;align-items:center;min-height:44px;text-decoration:underline;text-underline-offset:4px}
/* Reserve the measured fixed strip, including safe area, on every page type. */
.dux-shell-site {padding-bottom:var(--dux-bottom-inset,0px)}
html.dux-shell-ready {scroll-padding-bottom:calc(var(--dux-bottom-inset,0px) + 16px)}
.dux-shell-site :is(a,button,input,select,summary,[tabindex],iframe) {scroll-margin-bottom:calc(var(--dux-bottom-inset,0px) + 16px)}
.dux-shell-site .article-toc summary {min-height:44px}
@media(max-width:1100px) {
  .dux-header {display:flex;flex-wrap:wrap;gap:12px;padding:12px 20px}
  .dux-brand {margin-right:auto;flex-shrink:0}
  .dux-search {grid-column:2}
  .dux-menu>summary {grid-row:1;grid-column:3;display:flex;align-items:center;justify-content:center;min-height:44px;cursor:pointer;border:1px solid var(--dux-control);padding:8px 12px;border-radius:8px;font-size:1rem;list-style:none}
  .dux-menu>summary::-webkit-details-marker {display:none}
  .dux-menu[open]>summary {background:var(--dux-soft,#e8edf9)}
  .dux-menu-panel {width:calc(100vw - 40px);display:block;min-width:0;border-top:1px solid var(--dux-line);padding-top:12px}
  .dux-menu:not([open])>.dux-menu-panel {display:none}
  .dux-primary {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px}
  .dux-utility {justify-content:flex-start;gap:12px 20px;margin-top:16px;padding-top:12px}
  .dux-utility .locale-picker ul {position:static;width:100%;max-height:none;box-shadow:none;grid-template-columns:repeat(2,minmax(0,1fr))}
  .dux-utility .locale-picker[open] {width:100%}
}
@media(max-width:760px) {
  .dux-bottom {display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;border-top:1px solid var(--dux-line);padding:8px 8px calc(8px + env(safe-area-inset-bottom));z-index:30}
  .dux-bottom>a {display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:0;min-height:52px;padding:4px;color:var(--dux-muted);font-size:.8125rem;text-align:center;text-decoration:none;overflow-wrap:anywhere}
  .dux-bottom .ui-icon {width:21px;height:21px;color:currentColor}
  .dux-bottom [aria-current] {color:var(--dux-action);font-weight:700;text-decoration:underline;text-underline-offset:4px}
  .dux-shell-ready:not([data-bottom-flow]) .dux-bottom {position:fixed;inset:auto 0 0}
  .dux-utility .auth-area {width:100%}
}
@media(max-width:380px) {
  .dux-header {padding-inline:16px;gap:8px}
  .dux-menu-panel {width:calc(100vw - 32px)}
  .dux-search {padding-inline:10px}
  .dux-search span {position:absolute;width:1px;height:1px;clip-path:inset(50%);overflow:hidden}
  .dux-brand {font-size:1.5rem}
}
@media(prefers-reduced-motion:reduce) {.dux-shell-site,.dux-shell-ready {scroll-behavior:auto}.dux-v1 * {transition:none!important}}
@media print {.dux-shell,.dux-bottom,.dux-skip {display:none!important}.dux-shell-site {padding-bottom:0!important}}

/* DUX-0501: legacy article metadata must use the refresh contrast tokens. */
.design-site .post-row .date { color: var(--dux-muted); }
.design-site .post-row .lab-badge,
.design-site .lab-links .lab-badge { color: var(--dux-action-ink); background: var(--dux-action); }