/* ============================================================
   TrustXD ExamOS — long-form document pages
   PRD · Architecture blueprint · Psychometric specification
   ============================================================ */

.dochero {
  padding-top: clamp(8rem, 16vh, 12rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--line);
}
.dochero__meta { display: flex; flex-wrap: wrap; gap: .5rem 2rem; align-items: center; margin-bottom: 1.75rem; }
.dochero h1 { font-size: clamp(2.4rem, 5.5vw, 4.6rem); max-width: 18ch; }
.dochero .lead { margin-top: 1.5rem; max-width: 58ch; }
.dochero__facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  margin-top: clamp(2rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}
.dochero__fact { background: var(--paper); padding: 1rem 1.15rem; }
.dochero__fact b { display: block; font-size: var(--t-mono); font-family: var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-4); margin-bottom: .4rem; font-weight: 400; }
.dochero__fact span { font-size: var(--t-sm); letter-spacing: -.015em; }
@media (max-width: 800px) { .dochero__facts { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* Layout: sticky TOC + article */
.doc {
  display: grid;
  grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 5rem);
  align-items: start;
  padding-block: clamp(2.5rem, 6vw, 5rem) clamp(4rem, 9vw, 8rem);
}
.toc { position: sticky; top: 108px; max-height: calc(100vh - 140px); overflow-y: auto; padding-right: .5rem; }
.toc h2 { font-family: var(--mono); font-size: var(--t-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-4); font-weight: 400; margin-bottom: 1rem; }
.toc ol { display: flex; flex-direction: column; border-left: 1px solid var(--line); }
.toc__link {
  position: relative;
  display: block;
  padding: .5rem 0 .5rem 1rem;
  font-size: var(--t-sm);
  color: var(--ink-3);
  line-height: 1.3;
  transition: color .4s var(--ease), padding .4s var(--ease);
}
.toc__link::before {
  content: "";
  position: absolute;
  left: -1px; top: 0; bottom: 0;
  width: 2px; background: var(--accent);
  transform: scaleY(0); transform-origin: top;
  transition: transform .5s var(--ease);
}
.toc__link:hover { color: var(--ink); }
.toc__link.is-active { color: var(--ink); padding-left: 1.25rem; }
.toc__link.is-active::before { transform: scaleY(1); }
.toc__sub { padding-left: 2rem; font-size: var(--t-xs); }

@media (max-width: 940px) {
  .doc { grid-template-columns: minmax(0, 1fr); }
  .toc { position: static; max-height: none; padding-bottom: 1.5rem; border-bottom: 1px solid var(--line); }
  .toc ol { flex-direction: row; flex-wrap: wrap; border-left: 0; gap: .25rem; }
  .toc__link { padding: .35rem .75rem; box-shadow: inset 0 0 0 1px var(--line); border-radius: 100px; font-size: var(--t-xs); }
  .toc__link::before { display: none; }
  .toc__link.is-active { padding-left: .75rem; background: var(--accent-wash); color: var(--accent-deep); box-shadow: inset 0 0 0 1px var(--accent-line); }
  .toc__sub { padding-left: .75rem; }
}

/* Article typography */
.prose { max-width: 78ch; }
.prose > * + * { margin-top: 1.15rem; }
.prose section { scroll-margin-top: 110px; }
.prose section + section { margin-top: clamp(3rem, 6vw, 5rem); padding-top: clamp(2rem, 4vw, 3rem); border-top: 1px solid var(--line); }
.prose h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.3rem);
  letter-spacing: -.035em;
  margin-bottom: 1.25rem;
}
.prose h2 .sn { font-family: var(--mono); font-size: .42em; letter-spacing: .12em; color: var(--accent-deep); display: block; margin-bottom: .9rem; text-transform: uppercase; }
.prose h3 { font-size: 1.22rem; letter-spacing: -.028em; margin-top: 2.25rem; margin-bottom: .65rem; }
.prose h4 { font-size: 1rem; letter-spacing: -.02em; margin-top: 1.6rem; margin-bottom: .4rem; }
.prose p { color: var(--ink-2); text-wrap: pretty; }
.prose strong { font-weight: 500; color: var(--ink); }
.prose em { font-family: var(--serif); font-style: italic; font-size: 1.06em; }
.prose a:not(.btn):not(.chip) { color: var(--accent-deep); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; text-decoration-color: var(--accent-line); }
.prose a:not(.btn):not(.chip):hover { text-decoration-color: var(--accent); }

.prose ul.bullets, .prose ol.steps { display: flex; flex-direction: column; gap: .6rem; }
.prose ul.bullets li { position: relative; padding-left: 1.35rem; color: var(--ink-2); }
.prose ul.bullets li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 5px; height: 5px; border-radius: 100px; background: var(--accent);
}
.prose ol.steps { counter-reset: s; }
.prose ol.steps li { position: relative; padding-left: 2.1rem; counter-increment: s; color: var(--ink-2); }
.prose ol.steps li::before {
  content: counter(s, decimal-leading-zero);
  position: absolute; left: 0; top: .12em;
  font-family: var(--mono); font-size: var(--t-mono);
  color: var(--ink-4); letter-spacing: .06em;
}

/* Callouts */
.note {
  border-radius: var(--r);
  padding: 1.1rem 1.25rem;
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--line);
  font-size: var(--t-sm);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
}
.note b { display: block; margin-bottom: .2rem; color: var(--ink); }
.note svg { margin-top: 2px; }
.note--accent { background: var(--accent-wash); box-shadow: inset 0 0 0 1px var(--accent-line); color: var(--accent-deep); }
.note--accent b, .note--accent p { color: var(--accent-deep); }
.note--warn { background: var(--st-review-bg); box-shadow: inset 0 0 0 1px rgba(250,178,25,.4); color: #7A5300; }
.note--warn b { color: #7A5300; }

/* Tables */
.dtable { margin-top: 1.5rem; overflow-x: auto; border-radius: var(--r); box-shadow: inset 0 0 0 1px var(--line); background: var(--surface); }
.dtable table { min-width: 560px; font-size: var(--t-sm); }
.dtable th, .dtable td { text-align: left; padding: .78rem 1rem; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.dtable thead th {
  font-family: var(--mono); font-size: var(--t-mono); letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-4); font-weight: 400;
  background: var(--surface-2); position: sticky; top: 0;
}
.dtable tbody tr:last-child td { border-bottom: 0; }
.dtable tbody tr:hover { background: var(--surface-2); }
.dtable td code, .prose code {
  font-family: var(--mono); font-size: .82em;
  background: var(--paper-sunk); padding: .12em .4em; border-radius: 4px;
  color: var(--ink);
}
.dtable .id { font-family: var(--mono); font-size: var(--t-mono); color: var(--accent-deep); white-space: nowrap; letter-spacing: .06em; }
.dtable .num { font-variant-numeric: tabular-nums; }

/* Requirement / story cards */
.story {
  background: var(--surface);
  border-radius: var(--r);
  box-shadow: inset 0 0 0 1px var(--line);
  padding: 1.25rem 1.4rem;
  margin-top: 1rem;
}
.story__head { display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: center; justify-content: space-between; margin-bottom: .75rem; }
.story__q { font-size: 1.06rem; letter-spacing: -.025em; line-height: 1.35; }
.story__ac { margin-top: 1rem; padding-top: .9rem; border-top: 1px dashed var(--line); }
.story__ac b { font-family: var(--mono); font-size: var(--t-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-4); display: block; margin-bottom: .5rem; font-weight: 400; }
.story__ac li { position: relative; padding-left: 1.4rem; font-size: var(--t-sm); color: var(--ink-2); }
.story__ac li + li { margin-top: .35rem; }
.story__ac li::before {
  content: ""; position: absolute; left: 0; top: .48em;
  width: 9px; height: 5px; border-left: 1.5px solid var(--st-clear); border-bottom: 1.5px solid var(--st-clear);
  transform: rotate(-45deg);
}

/* Code / payload blocks */
.code {
  background: var(--ink);
  color: #E7E7E2;
  border-radius: var(--r);
  padding: 1.15rem 1.3rem;
  font-family: var(--mono);
  font-size: .78rem;
  line-height: 1.75;
  overflow-x: auto;
  margin-top: 1.25rem;
  white-space: pre;
  tab-size: 2;
}
.code .k { color: #8FA3FF; }
.code .s { color: #9FD8A6; }
.code .c { color: #7C7F86; }
.code .n { color: #F0C070; }

/* Diagram frame */
.figure { margin-top: 1.75rem; }
.figure__frame {
  background: var(--surface);
  border-radius: var(--r-lg);
  box-shadow: inset 0 0 0 1px var(--line);
  padding: clamp(1rem, 2.5vw, 2rem);
  overflow-x: auto;
}
.figure svg { min-width: 620px; }
.figure figcaption {
  font-size: var(--t-xs);
  color: var(--ink-3);
  margin-top: .8rem;
  display: flex;
  gap: .6rem;
}
.figure figcaption b { font-family: var(--mono); font-size: var(--t-mono); letter-spacing: .1em; color: var(--ink-4); flex: none; font-weight: 400; }

/* Doc nav footer */
.docnav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.docnav a {
  background: var(--surface);
  border-radius: var(--r);
  box-shadow: inset 0 0 0 1px var(--line);
  padding: 1.15rem 1.35rem;
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.docnav a:hover { transform: translateY(-3px); box-shadow: inset 0 0 0 1px var(--accent-line), var(--shadow-2); }
.docnav b { display: block; font-family: var(--mono); font-size: var(--t-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-4); margin-bottom: .4rem; font-weight: 400; }
.docnav span { font-size: 1.05rem; letter-spacing: -.025em; }
.docnav a:last-child { text-align: right; }
@media (max-width: 620px) { .docnav { grid-template-columns: minmax(0, 1fr); } .docnav a:last-child { text-align: left; } }

/* Print — documents should print cleanly */
@media print {
  .toc, .docnav { display: none !important; }
  .doc { grid-template-columns: minmax(0, 1fr); display: block; }
  .prose { max-width: none; }
  .prose section { break-inside: avoid; }
  .code { background: #f4f4f2; color: #111; }
}