/* ------------------------------------------------------------------
   report.css — the long-form reading page for a technical report.

   Loaded after site.css, which supplies the palette tokens, the spacing
   scale, the .bar header chrome and the .eyebrow/.wrap primitives. Every
   colour here is a token, so light and dark both follow from site.css and
   there is nothing to keep in sync.

   Generated pages come from tools/build_reports.py.
   ------------------------------------------------------------------ */

/* Keyboard users land here first. */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  color: var(--text);
  padding: var(--s2) var(--s3);
  border: 1px solid var(--rule);
  border-radius: 0 0 6px 0;
  z-index: 10;
}
.skip:focus { left: 0; }

/* ---------- the document column ---------- */
.doc {
  padding: var(--s5) 0 var(--s6);
}
.doc > h1 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.9rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: var(--s2) 0 var(--s3);
  max-width: 24em;
}
.doc .standfirst {
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: var(--measure);
  margin: 0 0 var(--s4);
}

/* ---------- source / PDF links ---------- */
.doclinks {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2) var(--s3);
  margin: 0 0 var(--s5);
  padding-bottom: var(--s4);
  border-bottom: 1px solid var(--rule);
}
.doclink {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--accent-ink);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: .45rem var(--s3);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}
.doclink:hover { background: var(--accent-wash); border-color: var(--accent); }

/* ---------- table of contents ---------- */
.toc {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
  padding: var(--s3) var(--s4);
  margin: 0 0 var(--s5);
  max-width: var(--measure);
}
.toc ol {
  margin: var(--s2) 0 0;
  padding-left: 1.4em;
  columns: 2;
  column-gap: var(--s4);
}
.toc li { margin: .3rem 0; break-inside: avoid; }
.toc a { color: var(--muted); text-decoration: none; border-bottom: 1px solid transparent; }
.toc a:hover { color: var(--accent-ink); border-bottom-color: var(--accent); }
@media (max-width: 640px) { .toc ol { columns: 1; } }

/* ---------- the prose itself ---------- */
.prose-doc {
  font-family: var(--serif);
  font-size: 1.04rem;
  line-height: 1.68;
  color: var(--text);
}
.prose-doc > * { max-width: var(--measure); }

.prose-doc h2,
.prose-doc h3 {
  font-family: var(--sans);
  line-height: 1.25;
  letter-spacing: -0.01em;
  scroll-margin-top: var(--s4);
}
.prose-doc h2 {
  font-size: 1.42rem;
  margin: var(--s5) 0 var(--s3);
  padding-top: var(--s3);
  border-top: 1px solid var(--rule-soft);
}
.prose-doc h3 {
  font-size: 1.1rem;
  margin: var(--s4) 0 var(--s2);
  color: var(--accent-ink);
}
.prose-doc h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }

/* The anchor stays out of the way until the heading is hovered. */
.anchor {
  margin-left: .45em;
  font-family: var(--mono);
  font-weight: 400;
  font-size: .72em;
  color: var(--faint);
  text-decoration: none;
  opacity: 0;
  transition: opacity .2s var(--ease);
}
h2:hover .anchor, h3:hover .anchor, .anchor:focus { opacity: 1; }

.prose-doc p { margin: 0 0 var(--s3); }
.prose-doc ul, .prose-doc ol { margin: 0 0 var(--s3); padding-left: 1.5em; }
.prose-doc li { margin: .35rem 0; }
.prose-doc li > ul, .prose-doc li > ol { margin: .35rem 0; }

.prose-doc a { color: var(--accent-ink); text-decoration: none; border-bottom: 1px solid var(--rule); }
.prose-doc a:hover { background: var(--accent-wash); border-bottom-color: var(--accent); }

.prose-doc strong { font-weight: 650; }
.prose-doc hr { border: 0; border-top: 1px solid var(--rule-soft); margin: var(--s5) 0; }

.prose-doc blockquote {
  margin: 0 0 var(--s3);
  padding: var(--s2) var(--s3);
  border-left: 3px solid var(--rule);
  background: var(--surface-2);
  border-radius: 0 6px 6px 0;
  color: var(--muted);
}
.prose-doc blockquote p:last-child { margin-bottom: 0; }

/* ---------- code ---------- */
.prose-doc pre {
  font-family: var(--mono);
  font-size: .82rem;
  line-height: 1.6;
  background: var(--surface-2);
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
  padding: var(--s3);
  margin: 0 0 var(--s3);
  overflow-x: auto;          /* code may be wider than the column */
  max-width: 100%;
}
.prose-doc pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

/* ---------- tables ---------- */
/* Tables are the other thing allowed to exceed the reading column, so each
   one scrolls inside its own box rather than widening the page. */
.tablewrap {
  overflow-x: auto;
  margin: 0 0 var(--s4);
  max-width: 100%;
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
}
.prose-doc table {
  border-collapse: collapse;
  width: 100%;
  font-family: var(--sans);
  font-size: .88rem;
  line-height: 1.5;
}
.prose-doc thead th {
  text-align: left;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 500;
  background: var(--surface);
  padding: var(--s2) var(--s3);
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
.prose-doc tbody td {
  padding: var(--s2) var(--s3);
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}
.prose-doc tbody tr:last-child td { border-bottom: 0; }

/* ---------- colophon ---------- */
.colophon {
  border-top: 1px solid var(--rule);
  padding: var(--s4) 0 var(--s5);
  color: var(--muted);
  font-size: .92rem;
}
.colophon p { max-width: var(--measure); margin: var(--s2) 0 0; }
.colophon a { color: var(--accent-ink); text-decoration: none; border-bottom: 1px solid var(--rule); }
.colophon a:hover { border-bottom-color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  .doclink, .anchor { transition: none; }
}

/* ---------- figures ---------- */
/* box-sizing is explicit: max-width:100% caps the CONTENT box, so the 1px
   border would otherwise push the rendered width 2px past the viewport.
   Nothing constrained images until the first report page with a figure. A
   1408px-wide PNG stretched the document to 1448px inside a 390px viewport,
   and that also defeated .tablewrap above: once the document itself was
   over-wide the tables fitted inside it, so they never scrolled and the whole
   page scrolled sideways instead. Constraining the image fixes both. */
.prose-doc img {
  display: block;
  box-sizing: border-box;
  max-width: 100%;
  height: auto;
  margin: var(--s4) auto;
  border: 1px solid var(--rule-soft);
  border-radius: 8px;
}

/* Inline code carries long identifiers -- the worst here is
   test_move_index_in_range_for_all_legal_start_moves -- and monospace text
   with no hyphen or space has no break opportunity, so it pushed the page
   69px past a 390px viewport. Scoped to inline code deliberately: code inside
   <pre> must keep its own line breaks and scroll horizontally (handled
   above), not re-wrap. */
.prose-doc :not(pre) > code {
  overflow-wrap: anywhere;
}