:root {
  color-scheme: light;
  --paper: #f6f1e6;
  --linen: #eee6d6;
  --sheet: #fffdf8;
  --ink: #2a2420;
  --muted: #6e655a;
  --line: #cbbfa8;
  --accent: #a84b2a;
  --accent-dark: #7f351c;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 16px; line-height: 1.65; }
a { color: var(--accent); text-underline-offset: 4px; }
a:hover { color: var(--accent-dark); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; }
h1 { margin-bottom: 26px; font-size: clamp(3rem, 5.6vw, 5.3rem); line-height: 1.06; letter-spacing: -0.045em; }
h1 em { color: var(--accent); font-weight: 400; }
h2 { margin-bottom: 18px; font-size: clamp(2.4rem, 4vw, 3.5rem); line-height: 1.12; letter-spacing: -0.035em; }
h3 { margin-bottom: 10px; font-size: 1.6rem; line-height: 1.2; }
p:last-child { margin-bottom: 0; }
.skip-link { position: absolute; z-index: 100; top: -100px; left: 16px; padding: 12px 18px; background: var(--sheet); }
.skip-link:focus { top: 12px; }
.topbar, main, footer { width: min(1280px, calc(100% - 80px)); margin-inline: auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 25px 0; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-size: 1.25rem; font-weight: 700; letter-spacing: -0.03em; }
.brand img { border-radius: 7px; }
.brand small { display: block; font-size: 0.67rem; letter-spacing: 0.18em; font-weight: 500; text-transform: uppercase; }
.topbar nav { display: flex; flex-wrap: wrap; gap: 24px; }
.topbar nav a { color: var(--ink); font-size: 0.88rem; text-decoration: none; padding-block: 6px; }
.topbar nav a:hover { color: var(--accent); text-decoration: underline; }
.hero { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: clamp(36px, 6vw, 90px); align-items: center; padding: 88px 0 76px; }
.eyebrow { margin: 0 0 20px; color: var(--accent); font-size: 0.69rem; font-weight: 650; letter-spacing: 0.13em; text-transform: uppercase; }
.lead { max-width: 580px; color: #453d35; font-size: 1.08rem; line-height: 1.8; }
.action-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 22px; min-height: 48px; border: 1px solid var(--line); border-radius: 4px; padding: 11px 20px; color: var(--ink); background: var(--sheet); text-decoration: none; font-size: 0.86rem; font-weight: 600; transition: background 160ms ease; }
.button:hover { color: var(--ink); background: var(--linen); }
.button.primary { color: white; border-color: var(--accent); background: var(--accent); }
.button.primary:hover { color: white; background: var(--accent-dark); }
.boundary { margin: 24px 0 0; max-width: 490px; color: var(--muted); font-size: 0.77rem; line-height: 1.7; }
.notebook { position: relative; padding: 28px 30px 25px; background: var(--sheet); border: 1px solid var(--line); box-shadow: 5px 5px 0 var(--linen), 6px 6px 0 var(--line); }
.notebook::before { content: ""; position: absolute; top: -1px; right: 28px; width: 18px; height: 47px; background: var(--accent); clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 82%, 0 100%); }
.notebook-heading { display: flex; justify-content: space-between; padding-right: 44px; padding-bottom: 19px; border-bottom: 3px double var(--line); color: var(--muted); font-size: 0.67rem; text-transform: uppercase; letter-spacing: 0.1em; }
.notebook-title { margin: 28px 0; font-family: var(--serif); font-size: 1.9rem; line-height: 1.3; }
.principles { list-style: none; padding: 0; margin: 0; }
.principles li { display: flex; gap: 18px; padding: 17px 0; border-top: 1px solid #e2d9c8; }
.principles li > span { color: var(--accent); font-family: var(--serif); font-style: italic; }
.principles strong { font-size: 0.85rem; font-weight: 600; }
.principles p { margin: 4px 0 0; color: var(--muted); font-size: 0.8rem; line-height: 1.65; }
.notebook-foot { margin-top: 24px; padding-top: 16px; border-top: 3px double var(--line); font-size: 0.64rem; color: var(--muted); }
.strip { display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--line); padding: 25px 0; gap: 32px; }
.strip article { padding-right: 32px; }
.strip article + article { border-left: 1px solid var(--line); padding-left: 32px; }
.strip strong { font-family: var(--serif); font-size: 1.2rem; font-weight: 500; }
.strip p { margin: 5px 0 0; color: var(--muted); font-size: 0.83rem; }
.section { padding-block: 78px; }
.section + .section { border-top: 1px solid var(--line); }
.section-heading { max-width: 690px; margin-bottom: 38px; }
.section-heading > p:not(.eyebrow) { max-width: 650px; color: var(--muted); }
.chapter-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 24px; }
.chapter { border-top: 3px double var(--line); padding-top: 20px; }
.chapter-number { display: block; color: var(--accent); font-size: 0.67rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 16px; }
.chapter h3 { font-size: 1.4rem; }
.chapter p { color: var(--muted); font-size: 0.85rem; }
.section-note { margin: 30px 0 0; color: var(--muted); font-size: 0.82rem; }
kbd { border: 1px solid var(--line); border-radius: 3px; padding: 2px 5px; font-size: 0.75rem; }
.capture-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 40px; }
.capture { margin: 0; border: 1px solid var(--line); background: var(--sheet); }
.capture.wide { grid-column: 1 / -1; }
.capture a { display: block; }
.capture img { width: 100%; }
.capture figcaption { padding: 18px 20px; border-top: 1px solid var(--line); font-size: 0.84rem; }
.capture figcaption strong, .capture figcaption span { display: block; }
.capture figcaption span { margin-top: 5px; color: var(--muted); }
.evidence-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.evidence-card { padding: 30px; border: 1px solid var(--line); background: var(--sheet); }
.evidence-card .eyebrow { display: block; margin-bottom: 25px; }
.evidence-card p { color: var(--muted); font-size: 0.87rem; }
.evidence-card a { font-size: 0.8rem; }
.model-note { margin-top: 28px; border-left: 3px solid var(--accent); padding: 16px 24px; background: var(--linen); font-size: 0.85rem; }
.model-note p { color: #453d35; margin: 8px 0 0; }
.launch-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 36px; }
.launch-card { display: block; padding: 25px 0; border-top: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.launch-card .eyebrow { display: block; margin-bottom: 14px; }
.launch-card h3 { display: flex; justify-content: space-between; gap: 18px; }
.launch-card h3 span { color: var(--accent); }
.launch-card p { color: var(--muted); font-size: 0.89rem; max-width: 490px; }
.launch-card:hover h3 { color: var(--accent); text-decoration: underline; text-underline-offset: 5px; }
.safety { display: grid; grid-template-columns: 1fr auto; gap: 64px; padding: 40px; margin-bottom: 60px; border-block: 3px double var(--line); background: var(--linen); }
.safety h2 { font-size: 2.4rem; }
.safety p:not(.eyebrow) { max-width: 770px; font-size: 0.86rem; color: #453d35; }
.safety-actions { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 18px; }
.text-link { font-size: 0.77rem; }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 24px 0 36px; border-top: 1px solid var(--line); font-size: 0.75rem; color: var(--muted); }
@media (max-width: 1050px) {
  .hero { grid-template-columns: 1fr 0.85fr; gap: 35px; padding-top: 60px; }
  .chapter-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .evidence-card { padding: 22px; }
  .safety { gap: 30px; }
}
@media (max-width: 780px) {
  .topbar, main, footer { width: calc(100% - 40px); }
  .topbar { align-items: flex-start; flex-direction: column; gap: 16px; }
  .topbar nav { gap: 20px; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 50px; }
  h1 { font-size: clamp(3.1rem, 10vw, 4.6rem); }
  .notebook { max-width: 550px; }
  .strip { gap: 18px; }
  .strip article { padding-right: 0; }
  .strip article + article { padding-left: 18px; }
  .chapter-grid, .evidence-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .evidence-card:last-child { grid-column: 1 / -1; }
  .section { padding-block: 55px; }
  .safety { grid-template-columns: 1fr; padding: 28px; }
}
@media (max-width: 500px) {
  .topbar, main, footer { width: calc(100% - 32px); }
  .topbar nav { gap: 18px; }
  .topbar nav a { font-size: 0.78rem; }
  .notebook { padding: 22px; }
  .strip, .chapter-grid, .evidence-grid, .launch-grid, .capture-grid { grid-template-columns: 1fr; }
  .strip article + article { border-left: 0; border-top: 1px solid var(--line); padding: 16px 0 0; }
  .chapter-grid { gap: 22px; }
  .chapter { padding-top: 16px; }
  .chapter-number { margin-bottom: 12px; }
  .launch-grid { gap: 0; }
  .capture.wide, .evidence-card:last-child { grid-column: auto; }
  .action-row .button { width: 100%; }
  .safety { padding: 24px; margin-bottom: 30px; }
  footer { flex-direction: column; gap: 8px; }
}
/* Archive selectors: radios + :has(), no JavaScript (tool/wiki_svg/site_archive.py). */
:root {
  --card-top: #f2ebdd;
  --card-left: #ded3bf;
  --card-right: #cdbfa6;
  --enter: cubic-bezier(0.22, 1, 0.36, 1);
  --smooth: cubic-bezier(0.65, 0, 0.35, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}
/* Custom properties do not validate, so the linear() spring needs @supports. */
@supports (transition-timing-function: linear(0, 1)) {
  :root { --spring: linear(0, 0.06 1.5%, 0.23 3.5%, 0.86 9%, 1.12 13%, 1.2 15.5%, 1.19 18%, 1.08 23%, 0.97 29%, 0.94 33%, 0.96 38%, 1.01 46%, 1.02 52%, 1 64%, 0.995 78%, 1); }
}
.archive-heading { max-width: 690px; margin-top: 64px; }
.archive-heading h3 { font-size: 2rem; }
.archive-heading p:not(.eyebrow) { color: var(--muted); }
.archive { --sc: 0; --sr: 0; display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: clamp(24px, 4vw, 56px); align-items: start; margin-top: 34px; padding-top: 30px; border-top: 3px double var(--line); }
.archive-field { width: 100%; height: auto; overflow: visible;
  mask-image: linear-gradient(to right, transparent, #000 7%, #000 90%, transparent), linear-gradient(to bottom, transparent, #000 10%, #000 90%, transparent);
  mask-composite: intersect; }
.archive .cf { fill: var(--card-left); stroke: var(--line); stroke-width: 0.6; }
.archive .cs { fill: var(--card-right); stroke: var(--line); stroke-width: 0.6; }
.archive .ct { fill: var(--card-top); stroke: var(--line); stroke-width: 0.6; }
.archive .cf-hot { fill: var(--sheet); stroke: none; }
.archive .spine { stroke: #a39888; stroke-width: 1.4; stroke-linecap: round; }
.archive .spine-hot { stroke: var(--accent); stroke-width: 2; stroke-linecap: round; }
.archive .hole { fill: var(--ink); }
/* Distance from the chosen card: columns weigh three rows. max(a, -a) is |a|. */
.archive .card {
  --pick: 0;
  --dc: max(var(--c) - var(--sc), var(--sc) - var(--c));
  --dr: max(var(--r) - var(--sr), var(--sr) - var(--r));
  --same: max(0, 1 - var(--dc));
  --d: calc(var(--dc) * 3 + var(--dr));
  opacity: calc(0.34 + 0.66 * var(--same));
  transition: opacity 480ms var(--smooth) calc(var(--d) * 24ms);
}
.archive .lift {
  transform: translateY(calc((var(--same) * max(0, 3 - var(--dr)) * 5 + var(--pick) * 64) * -1px));
  transition: transform 760ms var(--spring) calc(var(--d) * 24ms + var(--pick) * 260ms);
}
.archive .crest { animation: 900ms var(--smooth) both; animation-delay: calc(var(--d) * 30ms); }
.archive .cf-hot, .archive .spine-hot { opacity: var(--pick); transition: opacity 420ms var(--enter) calc(var(--pick) * 420ms); }
.archive-panel { min-width: 0; }
.archive-index { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 6px 4px; min-inline-size: 0; margin: 0 0 26px; padding: 0 0 14px; border: 0; border-bottom: 1px solid var(--ink); }
.archive-index legend { grid-column: 1 / -1; float: left; width: 100%; padding: 0; margin-bottom: 12px; color: var(--muted); font-size: 0.67rem; letter-spacing: 0.13em; text-transform: uppercase; }
.pick { position: relative; display: grid; gap: 2px; padding: 6px 10px 8px; cursor: pointer; border-bottom: 2px solid transparent; color: var(--muted); transition: color 160ms ease, border-color 160ms ease; }
.pick input { position: absolute; clip-path: inset(50%); overflow: hidden; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; white-space: nowrap; }
.pick-n { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.78rem; }
.pick-t { font-size: 0.68rem; letter-spacing: 0.04em; }
.pick:hover { color: var(--ink); }
.pick:has(input:checked) { color: var(--ink); border-bottom-color: var(--accent); }
.pick:has(input:focus-visible) { outline: 3px solid var(--accent); outline-offset: 2px; }
.rec { display: none; animation: rec-in 520ms var(--enter) both; }
.rec:first-of-type { display: block; }
.archive:has(.pick input:checked) .rec { display: none; }
.rec h3 { font-size: 1.55rem; margin-bottom: 18px; }
.rec dl { margin: 0; }
.rec dt { margin-top: 14px; color: var(--muted); font-size: 0.67rem; letter-spacing: 0.13em; text-transform: uppercase; }
.rec dd { margin: 4px 0 0; font-size: 0.9rem; color: #453d35; }
.archive-note { margin: 26px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.78rem; }
@keyframes rec-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.figures { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; margin: 0; }
.figures div { border-top: 3px double var(--line); padding-top: 18px; }
.figures dt { font-family: var(--serif); font-size: 2.4rem; line-height: 1.1; color: var(--ink); }
.figures dd { margin: 8px 0 0; color: var(--muted); font-size: 0.84rem; }
/* archive:generated:start */
.archive:has(#ev-0:checked) { --sc: 2; --sr: 9; }
.archive:has(#ev-0:checked) .crest { animation-name: archive-crest-0; }
.archive:has(#ev-0:checked) .card[data-k="ev-0"] { --pick: 1; }
.archive:has(#ev-0:checked) .rec[data-k="ev-0"] { display: block; }
.archive:has(#ev-1:checked) { --sc: 1; --sr: 5; }
.archive:has(#ev-1:checked) .crest { animation-name: archive-crest-1; }
.archive:has(#ev-1:checked) .card[data-k="ev-1"] { --pick: 1; }
.archive:has(#ev-1:checked) .rec[data-k="ev-1"] { display: block; }
.archive:has(#ev-2:checked) { --sc: 3; --sr: 4; }
.archive:has(#ev-2:checked) .crest { animation-name: archive-crest-2; }
.archive:has(#ev-2:checked) .card[data-k="ev-2"] { --pick: 1; }
.archive:has(#ev-2:checked) .rec[data-k="ev-2"] { display: block; }
.archive:has(#ev-3:checked) { --sc: 2; --sr: 13; }
.archive:has(#ev-3:checked) .crest { animation-name: archive-crest-3; }
.archive:has(#ev-3:checked) .card[data-k="ev-3"] { --pick: 1; }
.archive:has(#ev-3:checked) .rec[data-k="ev-3"] { display: block; }
.archive:has(#ev-4:checked) { --sc: 4; --sr: 8; }
.archive:has(#ev-4:checked) .crest { animation-name: archive-crest-4; }
.archive:has(#ev-4:checked) .card[data-k="ev-4"] { --pick: 1; }
.archive:has(#ev-4:checked) .rec[data-k="ev-4"] { display: block; }
.archive:has(#ev-5:checked) { --sc: 1; --sr: 11; }
.archive:has(#ev-5:checked) .crest { animation-name: archive-crest-5; }
.archive:has(#ev-5:checked) .card[data-k="ev-5"] { --pick: 1; }
.archive:has(#ev-5:checked) .rec[data-k="ev-5"] { display: block; }
.archive:has(#lg-0:checked) { --sc: 1; --sr: 3; }
.archive:has(#lg-0:checked) .crest { animation-name: archive-crest-0; }
.archive:has(#lg-0:checked) .card[data-k="lg-0"] { --pick: 1; }
.archive:has(#lg-0:checked) .rec[data-k="lg-0"] { display: block; }
.archive:has(#lg-1:checked) { --sc: 0; --sr: 8; }
.archive:has(#lg-1:checked) .crest { animation-name: archive-crest-1; }
.archive:has(#lg-1:checked) .card[data-k="lg-1"] { --pick: 1; }
.archive:has(#lg-1:checked) .rec[data-k="lg-1"] { display: block; }
.archive:has(#lg-2:checked) { --sc: 2; --sr: 6; }
.archive:has(#lg-2:checked) .crest { animation-name: archive-crest-2; }
.archive:has(#lg-2:checked) .card[data-k="lg-2"] { --pick: 1; }
.archive:has(#lg-2:checked) .rec[data-k="lg-2"] { display: block; }
.archive:has(#lg-3:checked) { --sc: 2; --sr: 10; }
.archive:has(#lg-3:checked) .crest { animation-name: archive-crest-3; }
.archive:has(#lg-3:checked) .card[data-k="lg-3"] { --pick: 1; }
.archive:has(#lg-3:checked) .rec[data-k="lg-3"] { display: block; }
@keyframes archive-crest-0 { 0% { transform: translateY(0); } 35% { transform: translateY(-16px); } 62% { transform: translateY(4px); } 100% { transform: translateY(0); } }
@keyframes archive-crest-1 { 0% { transform: translateY(0); } 35% { transform: translateY(-16px); } 62% { transform: translateY(4px); } 100% { transform: translateY(0); } }
@keyframes archive-crest-2 { 0% { transform: translateY(0); } 35% { transform: translateY(-16px); } 62% { transform: translateY(4px); } 100% { transform: translateY(0); } }
@keyframes archive-crest-3 { 0% { transform: translateY(0); } 35% { transform: translateY(-16px); } 62% { transform: translateY(4px); } 100% { transform: translateY(0); } }
@keyframes archive-crest-4 { 0% { transform: translateY(0); } 35% { transform: translateY(-16px); } 62% { transform: translateY(4px); } 100% { transform: translateY(0); } }
@keyframes archive-crest-5 { 0% { transform: translateY(0); } 35% { transform: translateY(-16px); } 62% { transform: translateY(4px); } 100% { transform: translateY(0); } }
/* archive:generated:end */
@media (max-width: 900px) {
  .archive { grid-template-columns: 1fr; }
  .figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 500px) {
  .figures { grid-template-columns: 1fr; }
  .figures dt { font-size: 2rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.not-found { width: min(760px, calc(100% - 40px)); margin: 18vh auto 12vh; }