:root {
  --ink: #27251f;
  --muted: #625d53;
  --paper: #f5f0e4;
  --paper-deep: #e9dfcb;
  --green: #254f3e;
  --green-light: #dce9df;
  --rust: #963d26;
  --gold: #d19b3c;
  --line: #cfc3ad;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }

body { margin: 0; line-height: 1.65; }

a { color: var(--green); text-underline-offset: 0.16em; }

.site-header {
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 74rem;
  padding: 1.25rem 2rem;
}

.brand { font-size: 1.25rem; font-weight: bold; text-decoration: none; white-space: nowrap; }
.brand::before { color: var(--gold); content: "✦"; margin-right: 0.45rem; }
.tagline, .byline, .eyebrow { color: var(--muted); }
.tagline { font-size: 0.9rem; }
.site-nav { display: flex; gap: 0.35rem; }
.site-nav a { border: 1px solid transparent; border-radius: 2rem; font-family: system-ui, sans-serif; font-size: 0.82rem; padding: 0.35rem 0.75rem; text-decoration: none; white-space: nowrap; }
.site-nav a[aria-current="page"] { background: var(--green-light); border-color: #9bb8a5; font-weight: 700; }
.eyebrow { font-family: system-ui, sans-serif; font-size: 0.76rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }

main { margin: 0 auto; max-width: 74rem; padding: 4rem 2rem; }
article { margin: 0 auto; max-width: 46rem; }
article:not(.book-intro) { font-size: 1.125rem; max-width: 43rem; }

h1, h2, h3 { line-height: 1.12; }
h1 { font-size: clamp(2.6rem, 8vw, 5.4rem); font-weight: 500; letter-spacing: -0.04em; margin: 0.2em 0 0.4em; }
h2 { font-size: 1.75rem; margin-top: 2.5em; }
h3 { font-size: 1.18rem; margin-top: 2em; }
.preview-title { font-size: clamp(2rem, 5vw, 3rem); }
.review-title { font-size: clamp(2rem, 4.5vw, 2.625rem); }

.hero { align-items: center; border-bottom: 1px solid var(--line); display: grid; gap: clamp(2rem, 5vw, 5rem); grid-template-columns: minmax(0, 0.85fr) minmax(20rem, 1.15fr); padding: 2rem 0 5rem; }
.hero h1 { max-width: 12ch; }
.hero em { color: var(--rust); }
.hero-copy > p:last-child { font-size: 1.25rem; max-width: 38rem; }
.hero-art { margin: 0 0.7rem 0.7rem 0; }
.hero-art img { background: #f4efe3; border: 2px solid var(--ink); border-radius: 0.45rem; box-shadow: 0.7rem 0.7rem 0 var(--gold); display: block; height: auto; width: 100%; }

.book-grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); }
.book-card { background: var(--green); border: 2px solid var(--ink); border-radius: 0.3rem; box-shadow: 0.4rem 0.4rem 0 var(--gold); color: white; display: flex; flex-direction: column; min-height: 19rem; overflow: hidden; padding: 2rem; position: relative; text-decoration: none; transition: transform 140ms ease, box-shadow 140ms ease; }
.book-card:nth-child(even) { background: var(--rust); }
.book-card.under-construction { background: #596159; box-shadow: 0.4rem 0.4rem 0 var(--line); }
.book-card:hover { box-shadow: 0.2rem 0.2rem 0 var(--gold); transform: translate(0.2rem, 0.2rem); }
.book-card:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }
.book-card strong { font-size: 2rem; line-height: 1.1; margin: auto 0 0.5rem; }
.book-card > span:not([class]) { font-size: 1.05rem; }
.book-card-label { color: white; font-family: system-ui, sans-serif; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.book-card:nth-child(even) .book-card-label { color: #f2d7c8; }
.book-card.under-construction .book-card-label { color: #eef2eb; }
.book-card-model { font-family: system-ui, sans-serif; font-size: 0.82rem; margin-top: 0.75rem; opacity: 0.9; }
.book-card-art { color: var(--gold); display: block; height: 5rem; margin: 1.25rem 0 1rem; position: relative; width: 8rem; }
.book-card-art span { border: 2px solid currentColor; display: block; position: absolute; }
.book-card-art span::before, .book-card-art span::after { border-top: 1px solid currentColor; content: ""; left: 0.25rem; position: absolute; right: 0.25rem; }
.book-card-art span::before { top: 0.4rem; }
.book-card-art span::after { bottom: 0.4rem; }
.book-card:nth-child(odd) .book-card-art span { border-radius: 0.15rem 0.35rem 0.35rem 0.15rem; bottom: 0; width: 1.75rem; }
.book-card:nth-child(odd) .book-card-art span:nth-child(1) { height: 4rem; left: 0.15rem; transform: rotate(-4deg); }
.book-card:nth-child(odd) .book-card-art span:nth-child(2) { height: 4.7rem; left: 2.15rem; }
.book-card:nth-child(odd) .book-card-art span:nth-child(3) { height: 3.65rem; left: 4.15rem; transform: rotate(5deg); }
.book-card:nth-child(even) .book-card-art { color: var(--paper); }
.book-card:nth-child(even) .book-card-art span { border-radius: 0.15rem 0.35rem 0.35rem 0.15rem; height: 1.3rem; left: 0; width: 6.8rem; }
.book-card:nth-child(even) .book-card-art span:nth-child(1) { top: 0.15rem; transform: rotate(3deg); }
.book-card:nth-child(even) .book-card-art span:nth-child(2) { left: 0.35rem; top: 1.75rem; transform: rotate(-2deg); }
.book-card:nth-child(even) .book-card-art span:nth-child(3) { left: 0.1rem; top: 3.35rem; transform: rotate(1deg); }

.book-intro { margin-bottom: 2rem; }
.book-intro + section h2 { margin-top: 1.5em; }
.byline { font-size: 1.15rem; font-style: italic; }
.model-credit, .edition-credit { color: var(--muted); font-family: system-ui, sans-serif; font-size: 0.78rem; }
.button { background: var(--green); border-radius: 2rem; color: white; display: inline-block; margin: 0.5rem 0.75rem 0.5rem 0; padding: 0.65rem 1.1rem; text-decoration: none; }
.text-link { display: inline-block; }

.note-list { list-style: none; margin: 0; padding: 0; }
.note-list li { align-items: center; border-top: 1px solid var(--line); display: grid; gap: 1rem; grid-template-columns: minmax(8rem, 0.65fr) minmax(20rem, 2fr); padding: 0.8rem 0; }
.note-list li:last-child { border-bottom: 1px solid var(--line); }
.note-list li > div { align-items: center; display: flex; gap: 0.5rem; }
.note-list .unit-label strong { color: var(--rust); font-size: 1.45rem; line-height: 1.2; }
.note-list a { white-space: nowrap; }
.note-list .section-actions { flex-wrap: wrap; }
.action-button, .recall-button { border: 1px solid var(--line); border-radius: 2rem; font-family: system-ui, sans-serif; font-size: 0.78rem; font-weight: 700; line-height: 1; padding: 0.55rem 0.75rem; text-decoration: none; }
.action-button.prepare { background: var(--green-light); border-color: #9bb8a5; }
.action-button.read { background: var(--green); border-color: var(--green); color: white; }
.action-button.review { background: var(--rust); border-color: var(--rust); color: white; }
.recall-button { color: var(--muted); }
.recall-intro { margin-bottom: 3rem; }
.recall-section { margin: 0 auto; max-width: 46rem; }
.recall-list { list-style: none; margin: 0; padding: 0; }
.recall-list li { margin-bottom: 0.75rem; }
.recall-card { border: 1px solid var(--line); border-radius: 0.25rem; scroll-margin-top: 1rem; }
.recall-card:target { outline: 3px solid var(--gold); outline-offset: 2px; }
.recall-card > summary { align-items: center; cursor: pointer; display: flex; font-family: system-ui, sans-serif; justify-content: space-between; padding: 1rem 1.2rem; }
.recall-card > summary strong { color: var(--rust); font-size: 1.2rem; }
.recall-card > summary span { color: var(--green); font-size: 0.84rem; font-weight: 700; }
.recall-card[open] > summary { background: var(--green-light); border-bottom: 1px solid var(--line); }
.recall-hide, .recall-card[open] .recall-show { display: none; }
.recall-card[open] .recall-hide { display: inline; }
.recall-body { background: var(--paper-deep); padding: 1rem 1.2rem; }
.recall-body ul { margin: 0; padding-left: 1.25rem; }
.recall-nav { border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1fr; padding: 0.8rem 1.2rem; }
.recall-nav a { font-size: 0.88rem; }
.recall-nav :last-child { text-align: right; }

.reading-flow { margin: 2rem 0; }
.reading-flow ol, .reading-flow-cards { display: grid; gap: 0.75rem; grid-template-columns: repeat(3, 1fr); list-style: none; margin: 0; padding: 0; }
.reading-flow li, .reading-flow-cards li { border: 1px solid var(--line); border-radius: 0.6rem; display: flex; flex-direction: column; overflow: hidden; }
.reading-flow li.active { background: var(--green-light); border-color: #9bb8a5; }
.reading-flow strong, .reading-flow a, .reading-flow-cards strong { font-family: system-ui, sans-serif; font-size: 1rem; }
.reading-flow span, .reading-flow-cards span { color: var(--muted); font-size: 0.9rem; line-height: 1.5; margin-top: 0.2rem; }
.reading-flow li > a { display: flex; flex: 1; flex-direction: column; padding: 0.8rem 0.9rem; text-decoration: none; }
.reading-flow li > a:hover { background: color-mix(in srgb, var(--green-light) 65%, transparent); }
.reading-flow-cards li { padding: 0.8rem 0.9rem; }
.home-workflow { border-bottom: 1px solid var(--line); padding-bottom: 3rem; }
.reading-flow-cards li { background: var(--paper-deep); min-height: 7rem; }
.reading-flow-cards strong { color: var(--rust); font-size: 1.15rem; }
.reading-flow-cards span { font-size: 1rem; line-height: 1.5; }

.boundary { background: var(--paper-deep); border-left: 5px solid var(--gold); display: grid; gap: 0.4rem; margin: 2.5rem 0; padding: 1.2rem 1.4rem; }
.boundary strong { font-family: system-ui, sans-serif; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.boundary span { display: block; }
.callout { border: 1px solid var(--line); border-radius: 0.25rem; margin: 2rem 0; padding: 1.1rem 1.3rem; }
.callout > :last-child { margin-bottom: 0; }
.callout-label { font-family: system-ui, sans-serif; font-size: 0.76rem; font-weight: bold; letter-spacing: 0.09em; margin: 0 0 0.5rem; text-transform: uppercase; }
.callout-context { background: var(--green-light); border-color: #9bb8a5; }
.callout-ideas { background: var(--green-light); border-left: 5px solid var(--green); }
.callout-language { border-left: 5px solid var(--gold); }
.callout-recall { background: var(--paper-deep); border-left: 5px solid var(--gold); }
.unit-heading { color: var(--rust); display: block; font-family: system-ui, sans-serif; font-size: clamp(1.2rem, 3vw, 1.5rem); font-weight: 700; letter-spacing: 0.08em; margin-bottom: 0.5rem; text-transform: uppercase; }

.status-badge { background: var(--gold); border-radius: 2rem; color: #241d12; display: inline-block; font-family: system-ui, sans-serif; font-size: 0.75rem; font-weight: 800; letter-spacing: 0.08em; padding: 0.4rem 0.75rem; text-transform: uppercase; }
.backlog-units { margin: 0 auto; max-width: 46rem; }
.backlog-units ol { list-style: none; margin: 0; padding: 0; }
.backlog-units li { align-items: center; border-top: 1px solid var(--line); display: flex; gap: 1rem; justify-content: space-between; padding: 0.75rem 0; }
.backlog-units li:last-child { border-bottom: 1px solid var(--line); }

article details { border: 1px solid var(--line); border-radius: 0.25rem; margin: 1rem 0 2rem; padding: 0.8rem 1rem; }
article details > summary { color: var(--green); cursor: pointer; font-family: system-ui, sans-serif; font-weight: bold; }

blockquote { border-left: 3px solid var(--line); color: var(--muted); margin-left: 0; padding-left: 1.25rem; }

.chapter-nav { border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1fr 1fr; margin: 4rem auto 0; max-width: 46rem; padding-top: 1rem; }
.chapter-nav a:nth-child(2) { text-align: center; }
.chapter-nav a:nth-child(3) { text-align: right; }

footer { border-top: 1px solid var(--line); color: var(--muted); display: flex; flex-direction: column; font-size: 0.85rem; gap: 0.4rem; margin: 2rem auto 0; max-width: 74rem; padding: 2rem; text-align: center; }
footer a { white-space: nowrap; }
.site-revision { color: var(--ink); font-family: system-ui, sans-serif; font-size: 0.82rem; }
.site-revision code { color: var(--ink); }

@media (max-width: 40rem) {
  .tagline { display: none; }
  main { padding: 2.5rem 1.2rem; }
  .site-header { gap: 0.5rem; padding: 1rem 0.75rem; }
  .site-nav a { font-size: 0.75rem; padding: 0.35rem 0.5rem; }
  .hero { grid-template-columns: 1fr; padding-top: 0.5rem; }
  .hero-art { margin-right: 0.6rem; }
  .chapter-nav { font-size: 0.85rem; }
  .note-list li { grid-template-columns: 1fr; }
  .note-list .section-actions { align-items: stretch; display: grid; grid-template-columns: repeat(2, 1fr); }
  .action-button, .recall-button { text-align: center; }
  .reading-flow ol, .reading-flow-cards { grid-template-columns: 1fr; }
  .reading-flow-cards li { min-height: 0; }
  .backlog-units li { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  .book-card { transition: none; }
}

@media (prefers-color-scheme: dark) {
  :root { --ink: #eee8db; --muted: #bcb4a5; --paper: #1e211d; --paper-deep: #2d332b; --line: #4a5047; --green: #3f765e; --green-light: #283a31; --rust: #df8264; }
  a, article details > summary, .recall-card > summary span { color: #91cbaa; }
  .action-button.review { color: var(--paper); }
  .book-card:nth-child(even):not(.under-construction),
  .book-card:nth-child(even):not(.under-construction) .book-card-label,
  .book-card:nth-child(even):not(.under-construction) .book-card-art { color: var(--paper); }
  .book-card:nth-child(odd) .book-card-art { color: var(--ink); }
}