/* ===========================================================================
   Documentation pages. The landing page's paper, ink and type, arranged as a
   three-column reference: sections on the left, the page in the middle, the
   page's own contents on the right.
   =========================================================================== */

.wrap-docs{ max-width:1360px; margin:0 auto; padding-inline:var(--gutter); }

/* ---- shell -------------------------------------------------------------- */
.docs-shell{
  display:grid; grid-template-columns:220px minmax(0,1fr) 200px; gap:56px;
  align-items:start;
}
.docs-bar{ display:none; }
.docs-main{ min-width:0; padding:40px 0 112px; }

/* ---- sidebar ------------------------------------------------------------ */
.side{
  position:sticky; top:var(--nav-h); max-height:calc(100vh - var(--nav-h));
  overflow:auto; padding:40px 4px 48px 0;
}
.side-group + .side-group{ margin-top:28px; }
.side-h{
  font-family:var(--font-sans); font-size:0.8125rem; font-weight:500;
  color:var(--graphite); margin-bottom:8px;
}
.side a{
  display:flex; align-items:center; gap:6px;
  padding:5px 0 5px 13px; border-left:1px solid var(--rule);
  font-size:0.9375rem; line-height:1.4; color:var(--graphite); text-decoration:none;
  transition:color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.side a:hover{ color:var(--ink); border-left-color:var(--graphite); }
.side a[aria-current="page"]{ color:var(--ink); font-weight:500; border-left:2px solid var(--ink); padding-left:12px; }

/* ---- contents column ---------------------------------------------------- */
.toc{
  position:sticky; top:var(--nav-h); max-height:calc(100vh - var(--nav-h));
  overflow:auto; padding:44px 0 48px; font-size:0.8125rem;
}
.toc-h{ font-weight:500; margin-bottom:10px; }
.toc a{
  display:block; padding:4px 0 4px 12px; border-left:1px solid var(--rule);
  color:var(--graphite); text-decoration:none; line-height:1.4;
}
.toc .l3 a{ padding-left:24px; }
.toc a:hover{ color:var(--ink); }
.toc a.cur{ color:var(--ink); border-left:2px solid var(--accent); padding-left:11px; }
.toc .l3 a.cur{ padding-left:23px; }

/* ---- page head ---------------------------------------------------------- */
.prose{ max-width:700px; }
.prose p{ max-width:none; }
.page-head{ padding-bottom:32px; border-bottom:1px solid var(--rule); }
.crumbs{ display:flex; gap:8px; margin-bottom:14px; font-size:0.875rem; color:var(--graphite); }
.crumbs a{ color:var(--graphite); }
.page-head h1{ font-size:clamp(2rem, 1.5rem + 2vw, 2.75rem); line-height:1.12; letter-spacing:-0.02em; }
.page-head .lede{ margin-top:16px; color:var(--graphite); }
.page-meta{ margin-top:18px; font-size:0.875rem; color:var(--graphite); }
.page-actions{ display:flex; gap:10px; flex-wrap:wrap; margin-top:18px; }

/* ---- prose -------------------------------------------------------------- */
.prose h2, .prose h3, .prose h4{ scroll-margin-top:calc(var(--nav-h) + 24px); }
.prose h2{ font-size:1.625rem; line-height:1.2; letter-spacing:-0.015em; margin-top:64px; }
.prose h3{ font-size:1.1875rem; line-height:1.3; margin-top:40px; }
.prose h4{ font-size:1rem; margin-top:28px; }
.prose > :is(p, ul, ol, dl, .code, .table, figure, .note, .cards){ margin-top:16px; }
.prose > :is(h2, h3) + *{ margin-top:14px; }
.prose p, .prose li{ line-height:1.7; }
.prose ul{ list-style:disc; padding-left:22px; }
.prose ol{ list-style:decimal; padding-left:24px; }
.prose li + li{ margin-top:6px; }
.prose li > ul, .prose li > ol{ margin-top:6px; }
.prose li::marker{ color:var(--graphite); }
.prose strong{ font-weight:500; }
.prose hr{ border:0; border-top:1px solid var(--rule); margin:48px 0; }

.anchor{
  margin-left:10px; font-family:var(--font-sans); font-weight:400; color:var(--graphite);
  text-decoration:none; opacity:0; transition:opacity var(--dur-fast) var(--ease);
}
:is(h2, h3):hover > .anchor, .anchor:focus-visible{ opacity:1; }

/* requirement keywords of BCP 14 */
.bcp{ font-weight:500; letter-spacing:0.02em; }

/* ---- code --------------------------------------------------------------- */
.prose :not(pre) > code{
  font-family:var(--font-mono); font-size:0.875em;
  background:var(--paper-sunk); padding:1px 5px; border-radius:var(--radius-sm);
  overflow-wrap:anywhere;
}
.code{ border:1px solid var(--rule); border-radius:var(--radius-md); background:var(--sheet); overflow:hidden; }
.code-bar{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  min-height:36px; padding:0 6px 0 14px; border-bottom:1px solid var(--rule);
  font-family:var(--font-mono); font-size:0.75rem; color:var(--graphite);
}
.copy{
  display:none; align-items:center; gap:6px; height:28px; padding:0 8px;
  border:0; border-radius:var(--radius-sm); background:none; cursor:pointer;
  font-family:var(--font-mono); font-size:0.75rem; color:var(--graphite);
  transition:color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.js .copy{ display:inline-flex; }
.copy:hover{ color:var(--ink); background:var(--paper-sunk); }
.copy svg{ width:14px; height:14px; fill:none; stroke:currentColor; stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }
.code pre{
  padding:14px 16px; overflow-x:auto;
  font-family:var(--font-mono); font-size:0.8125rem; line-height:1.65; tab-size:2;
}
.t-c{ color:var(--graphite); }
.t-s{ color:#7A4A12; }
.t-k{ font-weight:500; }

/* ---- tables ------------------------------------------------------------- */
.table{ overflow-x:auto; }
.prose table{ width:100%; border-collapse:collapse; font-size:0.9375rem; line-height:1.55; }
.prose th{ text-align:left; font-weight:500; padding:10px 18px 10px 0; border-bottom:1px solid var(--ink); vertical-align:bottom; }
.prose td{ padding:10px 18px 10px 0; border-bottom:1px solid var(--rule); vertical-align:top; }
.prose :is(th, td):last-child{ padding-right:0; }
.prose td code{ white-space:nowrap; }

/* ---- notes -------------------------------------------------------------- */
.note{ border-left:2px solid var(--ink); background:var(--paper-sunk); padding:14px 18px; border-radius:0 var(--radius-sm) var(--radius-sm) 0; }
.note p{ font-size:0.9375rem; }
.note p + p{ margin-top:8px; }
.note-k{ font-weight:500; }

/* ---- figures ------------------------------------------------------------ */
.prose figure{ border:1px solid var(--rule); border-radius:var(--radius-md); padding:clamp(16px, 3vw, 28px); }
.prose figcaption{ margin-top:18px; font-size:0.875rem; color:var(--graphite); max-width:66ch; }
.prose figure .loop-steps{ margin-top:28px; }
.prose figure .loop-steps li{ font-size:0.875rem; }
.prose figure .loop-steps li + li{ margin-top:0; }

/* the structure of a stamp: one band per layer */
.layers{ display:grid; border-top:1px solid var(--rule); }
.layer{
  display:grid; grid-template-columns:150px minmax(0,1fr); gap:20px; align-items:center;
  padding:16px 0; border-bottom:1px solid var(--rule);
}
.layer-k{ font-family:var(--font-serif); font-weight:500; font-size:1rem; line-height:1.3; }
.layer-k a{ display:block; font-family:var(--font-sans); font-weight:400; font-size:0.8125rem; color:var(--graphite); }
.layer-v{ min-width:0; font-family:var(--font-mono); font-size:0.8125rem; overflow-wrap:anywhere; }
.layer-v .dim{ display:block; margin-top:4px; font-family:var(--font-sans); font-size:0.8125rem; color:var(--graphite); }
.carrier{ display:flex; align-items:center; gap:16px; }
.carrier .qr{ width:56px; flex:none; }
.strip{ display:grid; }
.strip.env{ grid-template-columns:minmax(0,3fr) minmax(0,4fr) minmax(0,2fr); }
.strip.list{ grid-template-columns:repeat(5, minmax(0,1fr)) auto; }
.strip > span{
  display:flex; flex-direction:column; justify-content:center; min-width:0;
  padding:8px 10px; border:1px solid var(--ink); margin-left:-1px; line-height:1.35;
}
.strip > span:first-child{ margin-left:0; }
.strip > span{ overflow-wrap:normal; }
.strip small{ font-family:var(--font-sans); font-size:0.75rem; color:var(--graphite); }
.strip .more{ border-style:dashed; color:var(--graphite); }
.signed{ display:grid; grid-template-columns:minmax(0,7fr) minmax(0,2fr); margin-top:6px; }
.signed > span{
  height:12px; border:1px solid var(--accent); border-top:0;
  position:relative;
}
.signed b{
  position:absolute; left:50%; top:12px; transform:translateX(-50%);
  font-family:var(--font-sans); font-weight:400; font-size:0.75rem; color:var(--accent); white-space:nowrap;
}
.with-signed{ padding-bottom:22px; }

/* ---- cards: the documentation by task ----------------------------------- */
.cards{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.card{
  display:flex; flex-direction:column; gap:6px;
  padding:18px 20px 20px; border:1px solid var(--rule); border-radius:var(--radius-md);
  text-decoration:none; background:var(--paper);
  transition:border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.card:hover{ border-color:var(--ink); background:var(--sheet); }
.card-k{ font-family:var(--font-mono); font-size:0.75rem; color:var(--graphite); }
.card-t{ font-family:var(--font-serif); font-weight:500; font-size:1.125rem; line-height:1.3; }
.card-d{ font-size:0.9375rem; color:var(--graphite); line-height:1.55; }

.card-t .ext{ display:inline-block; vertical-align:-1px; margin-left:2px; }

/* ---- a verifier's display, as an example of section 9.1 ----------------- */
.vmock{ max-width:440px; border:1px solid var(--rule); border-radius:var(--radius-md); background:var(--sheet); overflow:hidden; }
.vmock-own{ padding:18px 20px; }
.vmock-k{ display:inline-flex; align-items:center; min-height:22px; padding:2px 8px; border-radius:var(--radius-sm);
  font-family:var(--font-mono); font-size:0.75rem; color:var(--ok); background:var(--ok-bg); }
.vmock-dom{ margin-top:10px; font-family:var(--font-mono); font-size:1.25rem; font-weight:500; overflow-wrap:anywhere; }
.vmock-meta{ margin-top:4px; font-size:0.8125rem; color:var(--graphite); }
.vmock-fields{ padding:16px 20px 18px; border-top:1px solid var(--rule); background:var(--paper); }
.vmock-h{ font-size:0.8125rem; color:var(--graphite); }
.vmock dl{ display:grid; grid-template-columns:auto 1fr; margin-top:8px; font-size:0.875rem; }
.vmock dt, .vmock dd{ padding:6px 0; border-bottom:1px solid var(--paper-sunk); }
.vmock dt{ color:var(--graphite); padding-right:16px; }
.vmock dd{ margin:0; text-align:right; }

/* ---- terms -------------------------------------------------------------- */
.terms{ display:grid; grid-template-columns:180px minmax(0,1fr); border-top:1px solid var(--rule); }
.terms dt, .terms dd{ padding:12px 0; border-bottom:1px solid var(--rule); }
.terms dt{ font-weight:500; padding-right:20px; }
.terms dd{ margin:0; font-size:0.9375rem; line-height:1.6; }
.terms dd a.ref{ font-size:0.8125rem; color:var(--graphite); white-space:nowrap; }

/* ---- previous and next -------------------------------------------------- */
.pager{ display:grid; grid-template-columns:1fr 1fr; gap:16px; max-width:700px; margin-top:80px; }
.pg{
  display:flex; flex-direction:column; gap:2px; padding:14px 18px;
  border:1px solid var(--rule); border-radius:var(--radius-md); text-decoration:none;
  transition:border-color var(--dur-fast) var(--ease);
}
.pg:hover{ border-color:var(--ink); }
.pg-next{ align-items:flex-end; text-align:right; }
.pg-k{ font-size:0.8125rem; color:var(--graphite); }
.pg-t{ display:inline-flex; align-items:center; gap:8px; font-family:var(--font-serif); font-weight:500; font-size:1.0625rem; }
.pg svg{ width:16px; height:16px; flex:none; fill:none; stroke:currentColor; stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }

/* ---- responsive --------------------------------------------------------- */
@media (max-width:1180px){
  .docs-shell{ grid-template-columns:220px minmax(0,1fr); gap:48px; }
  .toc{ display:none; }
}
@media (max-width:920px){
  .docs-shell{ grid-template-columns:minmax(0,1fr); gap:0; }
  .js .docs-bar{
    display:block; position:sticky; top:var(--nav-h); z-index:40;
    background:var(--paper); border-bottom:1px solid var(--rule);
  }
  .docs-bar-in{ display:flex; align-items:center; height:44px; }
  .side-toggle{
    padding:0; border:0; background:none; cursor:pointer;
    font-family:var(--font-mono); font-size:0.8125rem; font-weight:500; color:var(--ink);
  }
  .side{
    position:static; max-height:none; overflow:visible;
    padding:20px 0 24px; border-bottom:1px solid var(--rule);
  }
  .js .side{ display:none; }
  .js .side.open{ display:block; }
  .docs-main{ padding-top:28px; }
  .cards, .pager{ grid-template-columns:1fr; }
}
@media (max-width:620px){
  .layer{ grid-template-columns:1fr; gap:8px; }
  .terms{ grid-template-columns:1fr; }
  .terms dt{ padding-bottom:0; border-bottom:0; }
  .strip{ font-size:0.75rem; }
  .strip > span{ padding:6px 6px; }
  .strip small{ font-size:0.6875rem; }
  .strip.env{ grid-template-columns:minmax(0,3fr) minmax(0,3fr) minmax(0,2.5fr); }
  .signed{ grid-template-columns:minmax(0,6fr) minmax(0,2.5fr); }
}

/* ---- search ------------------------------------------------------------- */
.search{ position:relative; display:none; }
.js .search-head{ display:block; width:300px; margin-left:24px; }
.search-input{
  width:100%; height:38px; padding:0 36px 0 36px;
  border:1px solid var(--rule); border-radius:var(--radius-sm); background:var(--sheet);
  font-family:var(--font-sans); font-size:0.875rem; color:var(--ink);
  -webkit-appearance:none; appearance:none;
  transition:border-color var(--dur-fast) var(--ease);
}
.search-input::placeholder{ color:var(--graphite); }
.search-input:hover{ border-color:var(--graphite); }
.search-input:focus{ outline:none; border-color:var(--ink); }
.search-input::-webkit-search-cancel-button{ -webkit-appearance:none; appearance:none; }
.search-icon{
  position:absolute; left:11px; top:11px; width:16px; height:16px; pointer-events:none;
  fill:none; stroke:var(--graphite); stroke-width:2; stroke-linecap:round; stroke-linejoin:round;
}
.search-key{
  position:absolute; right:8px; top:8px; min-width:22px; height:22px; padding:0 6px;
  display:flex; align-items:center; justify-content:center; pointer-events:none;
  border:1px solid var(--rule); border-radius:var(--radius-sm); background:var(--paper);
  font-family:var(--font-mono); font-size:0.75rem; color:var(--graphite);
}
.search-input:focus ~ .search-key, .search-input:not(:placeholder-shown) ~ .search-key{ display:none; }
.search-results{
  position:absolute; top:calc(100% + 6px); left:0; z-index:70;
  width:min(480px, calc(100vw - 2 * var(--gutter)));
  max-height:min(70vh, 560px); overflow:auto; padding:6px;
  background:var(--paper); border:1px solid var(--rule); border-radius:var(--radius-md);
  box-shadow:0 12px 32px rgba(16,20,24,0.10);
}
.search-results[hidden]{ display:none; }
.search-results a{ display:block; padding:10px 12px; border-radius:var(--radius-sm); text-decoration:none; }
.search-results [aria-selected="true"] a, .search-results a:hover{ background:var(--paper-sunk); }
.hit-k{ display:block; font-size:0.75rem; color:var(--graphite); }
.hit-h{ display:block; font-weight:500; font-size:0.9375rem; line-height:1.35; }
.hit-s{ display:block; margin-top:3px; font-size:0.8125rem; line-height:1.5; color:var(--graphite); }
.hit-s mark, .hit-h mark{ background:rgba(37,99,235,0.14); color:var(--ink); border-radius:1px; }
.search-empty{ padding:12px; font-size:0.875rem; color:var(--graphite); }

@media (max-width:920px){
  .js .search-head{ display:none; }
  .js .search-bar{ display:block; flex:1; margin-left:20px; }
  .docs-bar-in{ height:56px; }
  .search-bar .search-key{ display:none; }
  .search-bar .search-results{ left:auto; right:0; width:min(480px, calc(100vw - 2 * var(--gutter))); }
}