/* =========================================================================
   Static pages — About, Contact, Terms, Privacy, Accessibility, Sitemap.

   One stylesheet for every page that is prose rather than a tool. Scoped to
   .qdt-doc so nothing here can reach a tool page, and built entirely from the
   site tokens (--paper, --rule, --ink, --mark) so it follows the theme and
   dark mode without a single hard-coded colour.

   The layout is the same "technical paper" idea as the rest of the site: a
   wide measure for structure, a narrow measure for reading, hairline rules
   instead of boxes, and monospace for anything a machine would care about.
   ========================================================================= */

.qdt-doc{
  --doc-measure: 72ch;
  padding: 0 0 calc(var(--u) * 3);
}
.qdt-doc .doc-shell{
  margin-inline: auto;
  width: min(calc(100% - var(--u) * 2), var(--qdt-shell));
}

/* ------------------------------------------------------------ breadcrumb */
.qdt-doc .doc-crumb{
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 18px 0 0;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .04em;
  color: var(--ink-3);
}
.qdt-doc .doc-crumb a{ color: var(--ink-3); text-decoration: none; }
.qdt-doc .doc-crumb a:hover{ color: var(--mark); text-decoration: underline; }

/* ------------------------------------------------------------------ head */
.qdt-doc .doc-head{
  padding: 26px 0 30px;
  border-bottom: 1px solid var(--rule);
}
.qdt-doc .doc-kicker{
  display: inline-block;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--mark);
  padding-bottom: 10px;
}
.qdt-doc .doc-head h1{
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 50px);
  line-height: 1.08;
  letter-spacing: -.022em;
  color: var(--ink);
}
.qdt-doc .doc-lead{
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.68;
  color: var(--ink-2);
}

/* A row of small facts under the title — effective date, contact, standard. */
.qdt-doc .doc-facts{
  display: flex; flex-wrap: wrap;
  margin: 26px 0 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.qdt-doc .doc-facts > div{
  padding: 11px 20px 11px 0; margin-right: 20px;
  border-right: 1px solid var(--rule);
}
.qdt-doc .doc-facts > div:last-child{ border-right: 0; margin-right: 0; padding-right: 0; }
.qdt-doc .doc-facts dt{
  font-family: var(--font-mono); font-size: 9.5px; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3);
}
.qdt-doc .doc-facts dd{
  margin: 4px 0 0;
  font-family: var(--font-mono); font-size: 12px; color: var(--ink);
}
.qdt-doc .doc-facts dd a{ color: var(--mark); text-decoration: none; }
.qdt-doc .doc-facts dd a:hover{ text-decoration: underline; }

/* ---------------------------------------------------------------- layout */
/* Two columns on wide screens: a sticky contents rail and the prose. The
   rail collapses away below 1000px rather than stacking a long list of links
   above the content the reader actually came for. */
.qdt-doc .doc-layout{
  display: grid;
  grid-template-columns: 216px minmax(0, 1fr);
  gap: calc(var(--u) * 2);
  padding-top: calc(var(--u) * 1.4);
  align-items: start;
}
.qdt-doc .doc-layout.is-single{ grid-template-columns: minmax(0, 1fr); }

.qdt-doc .doc-toc{ position: sticky; top: calc(var(--u) * 3.6); }
.qdt-doc .doc-toc-title{
  font-family: var(--font-mono); font-size: 9.5px; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3);
  padding-bottom: 12px; border-bottom: 1px solid var(--rule);
}
.qdt-doc .doc-toc ol{ list-style: none; margin: 10px 0 0; padding: 0; counter-reset: toc; }
.qdt-doc .doc-toc li{ counter-increment: toc; }
.qdt-doc .doc-toc a{
  display: flex; gap: 9px;
  padding: 6px 0;
  font-size: 13px; line-height: 1.45;
  color: var(--ink-2); text-decoration: none;
  border-left: 2px solid transparent; padding-left: 10px;
  transition: color .15s, border-color .15s;
}
.qdt-doc .doc-toc a::before{
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-3);
  padding-top: 2px;
}
.qdt-doc .doc-toc a:hover{ color: var(--mark); border-left-color: var(--mark); }

/* ----------------------------------------------------------------- prose */
.qdt-doc .doc-body{ min-width: 0; }
.qdt-doc .doc-section{ padding: 0 0 calc(var(--u) * 1.5); scroll-margin-top: calc(var(--u) * 3.4); }
.qdt-doc .doc-section + .doc-section{ padding-top: calc(var(--u) * .6); }

.qdt-doc .doc-section h2{
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 25px);
  line-height: 1.2; letter-spacing: -.014em;
  color: var(--ink);
}
.qdt-doc .doc-section h3{
  margin: 24px 0 8px;
  font-family: var(--font-display);
  font-size: 16.5px; line-height: 1.3; letter-spacing: -.008em;
  color: var(--ink);
}
.qdt-doc .doc-body p{
  margin: 0 0 14px;
  max-width: var(--doc-measure);
  font-size: 15px; line-height: 1.75; color: var(--ink-2);
}
.qdt-doc .doc-body p:last-child{ margin-bottom: 0; }
.qdt-doc .doc-body strong{ color: var(--ink); font-weight: 600; }
.qdt-doc .doc-body a{ color: var(--mark); text-decoration: underline; text-underline-offset: 2px; }
.qdt-doc .doc-body a:hover{ color: var(--mark-deep); }
.qdt-doc .doc-body code{
  font-family: var(--font-mono); font-size: .88em;
  padding: 1px 5px; border-radius: var(--r-sm);
  background: var(--paper-2); border: 1px solid var(--rule-2); color: var(--ink);
}

.qdt-doc .doc-body ul,
.qdt-doc .doc-body ol{
  margin: 0 0 16px; padding-left: 0; list-style: none;
  max-width: var(--doc-measure);
  display: grid; gap: 8px;
}
.qdt-doc .doc-body li{
  position: relative; padding-left: 20px;
  font-size: 15px; line-height: 1.7; color: var(--ink-2);
}
.qdt-doc .doc-body ul li::before{
  content: ""; position: absolute; left: 2px; top: .72em;
  width: 6px; height: 1px; background: var(--mark);
}
.qdt-doc .doc-body ol{ counter-reset: doclist; }
.qdt-doc .doc-body ol li{ counter-increment: doclist; padding-left: 28px; }
.qdt-doc .doc-body ol li::before{
  content: counter(doclist) ".";
  position: absolute; left: 2px; top: 0;
  font-family: var(--font-mono); font-size: 12px; color: var(--mark);
}

/* --------------------------------------------------------------- callout */
.qdt-doc .doc-note{
  margin: 18px 0; padding: 15px 18px;
  max-width: var(--doc-measure);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--mark);
  border-radius: var(--r);
  background: var(--paper-2);
}
.qdt-doc .doc-note.is-warn{ border-left-color: var(--warn); }
.qdt-doc .doc-note strong{ display: block; margin-bottom: 5px; font-size: 13.5px; color: var(--ink); }
.qdt-doc .doc-note p{ margin: 0; font-size: 13.5px; line-height: 1.65; }

/* ----------------------------------------------------------------- cards */
.qdt-doc .doc-grid{
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  margin: 4px 0 20px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--r);
  overflow: hidden;
}
.qdt-doc .doc-card{ padding: 20px; background: var(--paper); }
.qdt-doc .doc-card .num{
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--mark);
}
.qdt-doc .doc-card h3{ margin: 9px 0 6px; font-size: 15.5px; }
.qdt-doc .doc-card p{ margin: 0; font-size: 13.5px; line-height: 1.6; }

/* ------------------------------------------------------------ definition */
/* Used by Privacy ("what we collect") and Terms ("definitions"): a two-column
   list that degrades to stacked rows on narrow screens. */
.qdt-doc .doc-dl{
  margin: 4px 0 20px; max-width: var(--doc-measure);
  border-top: 1px solid var(--rule);
}
.qdt-doc .doc-dl > div{
  display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 18px;
  padding: 14px 0; border-bottom: 1px solid var(--rule);
}
.qdt-doc .doc-dl dt{
  font-family: var(--font-mono); font-size: 11.5px; line-height: 1.55;
  letter-spacing: .02em; color: var(--ink);
}
.qdt-doc .doc-dl dd{ margin: 0; font-size: 14px; line-height: 1.65; color: var(--ink-2); }

/* --------------------------------------------------------------- contact */
.qdt-doc .contact-grid{
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  margin: 4px 0 24px;
}
.qdt-doc .contact-card{
  display: block; padding: 20px;
  border: 1px solid var(--rule); border-radius: var(--r);
  background: var(--paper); text-decoration: none;
  transition: border-color .18s, transform .18s, box-shadow .18s;
}
.qdt-doc a.contact-card:hover{
  border-color: var(--mark); transform: translateY(-2px); box-shadow: var(--qdt-shadow);
}
.qdt-doc .contact-card .tagline{
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--mark);
}
.qdt-doc .contact-card strong{ display: block; margin: 8px 0 5px; font-size: 15.5px; color: var(--ink); }
.qdt-doc .contact-card span{ display: block; font-size: 13.5px; line-height: 1.6; color: var(--ink-2); }
.qdt-doc .contact-card .addr{
  display: inline-block; margin-top: 10px;
  font-family: var(--font-mono); font-size: 12px; color: var(--mark);
}

/* Composer: a plain form that builds a mailto: link. No server, no storage,
   no third party — which is also the honest answer to "where does this go?". */
.qdt-doc .compose{
  max-width: var(--doc-measure);
  padding: 20px; margin: 4px 0 8px;
  border: 1px solid var(--rule); border-radius: var(--r); background: var(--paper);
}
.qdt-doc .compose .field{ display: grid; gap: 6px; margin-bottom: 14px; }
.qdt-doc .compose label{
  font-family: var(--font-mono); font-size: 9.5px; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3);
}
.qdt-doc .compose input,
.qdt-doc .compose select,
.qdt-doc .compose textarea{
  width: 100%; padding: 10px 12px;
  font-family: var(--font-body); font-size: 14px; color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--rule); border-radius: var(--r-sm);
  transition: border-color .15s, box-shadow .15s;
}
.qdt-doc .compose textarea{ min-height: 130px; resize: vertical; line-height: 1.6; }
.qdt-doc .compose input:focus,
.qdt-doc .compose select:focus,
.qdt-doc .compose textarea:focus{
  outline: none; border-color: var(--mark); box-shadow: 0 0 0 3px var(--mark-soft);
}
.qdt-doc .compose-actions{ display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.qdt-doc .btn-mark{
  padding: 11px 20px; border: 0; border-radius: var(--r-sm);
  font-family: var(--font-body); font-size: 14px; font-weight: 600;
  color: var(--paper); background: var(--ink);
  cursor: pointer; transition: transform .15s, box-shadow .15s;
}
.qdt-doc .btn-mark:hover{ transform: translateY(-1px); box-shadow: var(--qdt-shadow-lg); }
.qdt-doc .btn-ghost{
  padding: 11px 18px; border: 1px solid var(--rule); border-radius: var(--r-sm);
  font-family: var(--font-body); font-size: 14px; color: var(--ink-2);
  background: transparent; cursor: pointer; transition: border-color .15s, color .15s;
}
.qdt-doc .btn-ghost:hover{ border-color: var(--mark); color: var(--mark); }
.qdt-doc .compose-hint{ font-size: 12.5px; color: var(--ink-3); }

/* --------------------------------------------------------------- sitemap */
.qdt-doc .map-group{ padding: 0 0 calc(var(--u) * 1.1); scroll-margin-top: calc(var(--u) * 3.4); }
.qdt-doc .map-head{
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  padding-bottom: 10px; margin-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.qdt-doc .map-head h2{ margin: 0; border: 0; padding: 0; font-size: 19px; }
.qdt-doc .map-head .count{
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-3);
}
.qdt-doc .map-head .desc{ flex: 1 1 100%; font-size: 13.5px; color: var(--ink-2); line-height: 1.6; }
.qdt-doc .map-links{
  display: grid; gap: 8px;
  grid-template-columns: repeat(auto-fill, minmax(238px, 1fr));
}
.qdt-doc .map-link{
  display: flex; align-items: center; gap: 9px;
  padding: 10px 13px;
  border: 1px solid var(--rule); border-radius: var(--r-sm);
  background: var(--paper);
  font-size: 13.5px; color: var(--ink); text-decoration: none;
  transition: border-color .15s, color .15s, transform .15s;
}
.qdt-doc .map-link::before{
  content: "/"; font-family: var(--font-mono); font-size: 12px; color: var(--ink-3);
}
.qdt-doc .map-link:hover{ border-color: var(--mark); color: var(--mark); transform: translateX(2px); }
.qdt-doc .map-link:hover::before{ color: var(--mark); }
.qdt-doc .map-empty{
  padding: 14px; border: 1px dashed var(--rule); border-radius: var(--r-sm);
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .04em;
  text-transform: uppercase; color: var(--ink-3);
}

/* ------------------------------------------------------------------ tail */
.qdt-doc .doc-tail{
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  margin-top: calc(var(--u) * 1.2); padding-top: 20px;
  border-top: 1px solid var(--rule);
}
.qdt-doc .doc-tail p{ margin: 0; font-size: 13px; color: var(--ink-3); }
.qdt-doc .doc-tail .doc-tail-links{ display: flex; gap: 16px; flex-wrap: wrap; }
.qdt-doc .doc-tail a{ font-size: 13px; color: var(--ink-2); text-decoration: none; }
.qdt-doc .doc-tail a:hover{ color: var(--mark); text-decoration: underline; }

/* ------------------------------------------------------------ responsive */
@media (max-width: 1000px){
  .qdt-doc .doc-layout{ grid-template-columns: minmax(0, 1fr); gap: var(--u); }
  .qdt-doc .doc-toc{ position: static; }
  .qdt-doc .doc-toc ol{
    display: grid; gap: 2px;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  }
}
@media (max-width: 640px){
  .qdt-doc .doc-facts > div{ padding-right: 14px; margin-right: 14px; }
  .qdt-doc .doc-dl > div{ grid-template-columns: minmax(0, 1fr); gap: 5px; }
  .qdt-doc .map-links{ grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce){
  .qdt-doc *{ transition: none !important; }
  .qdt-doc a.contact-card:hover,
  .qdt-doc .btn-mark:hover,
  .qdt-doc .map-link:hover{ transform: none; }
}

@media print{
  .qdt-doc .doc-toc, .qdt-doc .doc-crumb, .qdt-doc .doc-tail{ display: none; }
  .qdt-doc .doc-layout{ grid-template-columns: minmax(0, 1fr); }
  .qdt-doc .doc-section{ page-break-inside: avoid; }
}