/* Plain reading counterpart to the existing paper/forest editorial identity.
   Every control is a native link or disclosure; no runtime stylesheet needed. */
:root {
  color-scheme: light;
  --bg: #f7f6f0;
  --panel: #fffefa;
  --panel-soft: #edf1e9;
  --ink: #192c27;
  --muted: #59655f;
  --line: #d2d8cd;
  --accent: #255b48;
  --warning: #805c27;
  --serif: Georgia, 'Times New Roman', serif;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 1.5rem; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 1rem/1.75 Inter, 'Segoe UI', Arial, sans-serif; }
a { color: var(--accent); text-underline-offset: .2em; overflow-wrap: anywhere; }
a:hover { color: var(--ink); text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
::selection { color: var(--ink); background: #dce8d8; }
main, .plain-masthead, .plain-footer { width: min(1200px, calc(100% - 6rem)); margin-inline: auto; }
.plain-skip { position: absolute; top: .5rem; left: 1rem; z-index: 2; padding: .65rem 1rem; background: var(--panel); transform: translateY(-200%); }
.plain-skip:focus { transform: translateY(0); }
.plain-masthead { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding-block: 1.75rem; border-bottom: 1px solid var(--line); }
.plain-brand { flex: none; font: 600 1.85rem/1 var(--serif); letter-spacing: .015em; text-decoration: none; color: var(--ink); }
.plain-brand span { display: block; margin-top: .65rem; font: 500 .6875rem/1.3 'Segoe UI', sans-serif; letter-spacing: .25em; text-align: center; }
.plain-brand .brand-kicker { margin:0 0 .45rem; }
.plain-masthead nav, .plain-footer nav { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
.plain-masthead nav a, .plain-footer nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: .9rem; }
.plain-title { max-width: 900px; padding-block: 2.5rem 2rem; }
h1, h2 { font-family: var(--serif); font-weight: 400; letter-spacing: -.025em; text-wrap: balance; }
h1 { margin: 0 0 1rem; font-size: 3rem; line-height: 1.12; }
h2 { margin: 0 0 1rem; font-size: 1.85rem; line-height: 1.25; }
h3, h4, h5, h6 { margin: 1.5rem 0 .6rem; font-size: 1.1rem; line-height: 1.45; }
p { margin: .7rem 0 1rem; max-width: 72ch; }
li { margin-block: .4rem; }
ul, ol { padding-left: 1.5rem; }
img, svg { max-width: 100%; height: auto; }
figure { margin: 1.5rem 0; }
figcaption { margin-top: 1rem; }
.muted, .plain-reading-note, .plain-personal-note { color: var(--muted); }
.plain-personal-note { font-size: .9rem; }
.plain-reader-separator { margin-inline: .6rem; }
.plain-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 3.5rem; align-items: start; }
.plain-layout > article { min-width: 0; }
.plain-contents { position: sticky; top: 1.5rem; padding-block: 1.2rem; border-top: 1px solid var(--line); }
.plain-contents h2 { font: 600 1rem/1.5 'Segoe UI', Arial, sans-serif; letter-spacing: 0; }
.plain-contents ul { list-style: none; padding: 0; margin: 0; }
.plain-contents li { margin: 0; }
.plain-contents a { display: block; padding-block: .55rem; font-size: .9rem; }
#deep-dive-body { max-width: 76ch; overflow-wrap: anywhere; }
#deep-dive-body > .eyebrow { margin-top: 1rem; color: var(--muted); font-size: .95rem; }
#deep-dive-body > section, #deep-dive-body > div { border-top: 1px solid var(--line); padding-block: 2rem; }
#deep-dive-body section[id], #deep-dive-body article[id] { scroll-margin-top: 1.5rem; }
#deep-dive-body :target { outline: 2px solid var(--accent); outline-offset: .6rem; }
.dossier-stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 2rem; }
.dossier-stat span, .dossier-stat strong { display: block; }
.dossier-stat span { color: var(--muted); font-size: .9rem; }
.claim-ledger-card, .topic-assessment-question, .deep-dive-source { margin-block: 1.5rem; padding-block: 1rem; border-bottom: 1px solid var(--line); }
.claim-ledger-card h3, .topic-assessment-question h3, .deep-dive-source h3 { margin-top: 0; }
.claim-ledger-sources, .feature-source-links, .feature-related, .related-topic-list { display: grid; gap: .8rem; }
.claim-ledger-sources, .feature-source-links { font-size: .9rem; }
.mechanism-flow { display: grid; gap: .6rem; margin-block: 1.5rem; }
.mechanism-node { border-top: 1px solid var(--line); padding-block: .7rem; }
.mechanism-node h3 { margin-top: .2rem; }
.mechanism-step { color: var(--muted); font-size: .9rem; }
.mechanism-arrow { display: none; }
.evidence-timeline-item { margin-block: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.evidence-timeline-date { color: var(--muted); font-variant-numeric: tabular-nums; }
.evidence-timeline-item h3 { margin-top: .25rem; }
.editorial-history-item + .editorial-history-item { margin-top: 2rem; }
.warning { color: var(--warning); }
.source-review-note, .protocol-scaffold, .feature-media { background: var(--panel-soft); padding: 1rem 1.25rem; margin-block: 1rem; }
.source-review-note p:last-child { margin-bottom: 0; }
details { margin-block: 1rem; }
summary { cursor: pointer; min-height: 44px; padding-block: .6rem; font-weight: 600; color: var(--accent); }
details > p { margin-left: 1rem; }
dt { font-weight: 600; }
dd { margin: .2rem 0 1rem; }
.study-snapshot { margin-block: 1.25rem; }
.topic-assessment-options { margin-block: 1rem; }
.research-study-figure { padding: 1.5rem; background: var(--panel-soft); }
.research-study-figure svg { display: block; width: 100%; }
.research-rate-group { margin-block: 1.5rem; }
.research-rate-row { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: .8rem; align-items: center; margin-block: .5rem; font-size: .9rem; font-variant-numeric: tabular-nums; }
.research-rate-track { height: 22px; background: var(--line); }
.research-rate-track span { display: block; height: 100%; background: var(--accent); }
.research-rate-track .is-comparator { background: var(--muted); }
.research-rate-axis > div { display: flex; justify-content: space-between; }
.research-outcome-map { list-style: none; padding: 0; }
.research-outcome-map li { border-top: 1px solid var(--line); padding-block: .75rem; }
.outcome-number { display: block; font: 400 2rem var(--serif); margin-bottom: .5rem; }
.feature-result { font-weight: 600; }
.feature-reading-block { border-top: 1px solid var(--line); margin-top: 1.5rem; padding-top: 1rem; }
.plain-alphabet { display: flex; flex-wrap: wrap; gap: .3rem; padding-block: 1rem; border-block: 1px solid var(--line); }
.plain-alphabet a { display: grid; place-items: center; min-width: 44px; min-height: 44px; }
.plain-directory { max-width: 900px; }
.plain-directory section { display: grid; grid-template-columns: 4rem minmax(0, 1fr); gap: 2rem; border-bottom: 1px solid var(--line); padding-block: 2rem; scroll-margin-top: 1.5rem; }
.plain-directory ul { list-style: none; margin: 0; padding: 0; }
.plain-directory li { margin: 0 0 1.3rem; }
.plain-directory a { display: inline-block; padding-block: .4rem; font-size: 1.1rem; }
.plain-directory p { margin: 0; font-size: .9rem; color: var(--muted); }
.plain-footer { margin-top: 4rem; border-top: 1px solid var(--line); padding-block: 2rem; font-size: .9rem; color: var(--muted); }
@media (max-width: 900px) {
  main, .plain-masthead, .plain-footer { width: calc(100% - 3rem); }
  .plain-masthead { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .plain-layout { grid-template-columns: minmax(0, 1fr); gap: 1rem; }
  .plain-contents { position: static; }
  .plain-contents ul { columns: 2; column-gap: 1.5rem; }
  .plain-contents li { break-inside: avoid; }
  #deep-dive-body { max-width: none; }
}
@media (max-width: 540px) {
  main, .plain-masthead, .plain-footer { width: calc(100% - 2rem); }
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.6rem; }
  .plain-title { padding-block: 2rem 1rem; }
  .plain-contents ul { columns: 1; }
  .plain-contents a { min-height: 44px; }
  .plain-masthead nav { gap: .2rem 1.2rem; }
  .plain-directory section { grid-template-columns: 2rem minmax(0, 1fr); gap: 1rem; }
  .dossier-stat-grid { gap: 1rem; }
  .research-study-figure { padding: 1rem; }
  .research-rate-row { grid-template-columns: 1fr; gap: .3rem; }
}
@media print {
  @page { margin: 18mm; }
  body { background: white; color: black; font-size: 10pt; line-height: 1.5; }
  main, .plain-footer { width: 100%; }
  .plain-masthead, .plain-contents, .plain-skip, .plain-footer nav, .plain-title > p:not(.plain-reading-note), .plain-alphabet { display: none; }
  .plain-layout { display: block; }
  #deep-dive-body { max-width: none; }
  .plain-title { padding-block: 0 1rem; }
  h1 { font-size: 26pt; }
  h2 { font-size: 19pt; }
  h2, h3, h4, summary { break-after: avoid; }
  .deep-dive-source, .topic-assessment-question, figure { break-inside: auto; }
  details::details-content { display: block !important; content-visibility: visible !important; height: auto !important; }
  details > :not(summary) { display: block !important; }
  summary { list-style: none; min-height: 0; }
  a { color: black; text-decoration: underline; }
  .deep-dive-source > a[href^="http"]::after { content: " (" attr(href) ")"; overflow-wrap: anywhere; }
  .research-rate-track, .research-rate-track span { print-color-adjust: exact; }
}