:root {
  --paper: #faf6ef;
  --paper-2: #f1eadd;
  --ink: #201c17;
  --ink-2: #5b5347;
  --ink-3: #8a8072;
  --line: #ddd2bd;
  --accent: #8a5a26;
  --accent-dark: #6b4419;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --maxw: 1080px;
  --maxw-narrow: 700px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17140f;
    --paper-2: #1e1a14;
    --ink: #f2ece1;
    --ink-2: #c9beac;
    --ink-3: #8f8570;
    --line: #362f24;
    --accent: #d19a52;
    --accent-dark: #e6b06a;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; color: var(--ink); margin: 0; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper); padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.wrap-narrow { max-width: var(--maxw-narrow); }

a { color: var(--accent-dark); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  font-family: var(--serif); font-weight: 600; font-size: 19px;
  color: var(--ink); text-decoration: none; letter-spacing: 0.01em;
}
.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a {
  color: var(--ink-2); text-decoration: none; font-size: 14.5px; font-weight: 500;
}
.site-nav a:hover { color: var(--ink); }
.nav-cta {
  color: var(--paper) !important; background: var(--ink);
  padding: 8px 16px; border-radius: 3px;
}
.nav-cta:hover { background: var(--accent-dark); }

/* Hero */
.hero { padding: 96px 0 72px; text-align: center; }
.eyebrow {
  font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent-dark); font-weight: 600; margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(48px, 8vw, 86px); line-height: 1.02; margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.hero-author { font-size: 18px; color: var(--ink-2); margin: 0; }
.rule {
  width: 64px; height: 1px; background: var(--line);
  margin: 34px auto;
}
.motto {
  max-width: 560px; margin: 0 auto 40px; font-family: var(--serif);
  font-style: italic; font-size: 21px; line-height: 1.5; color: var(--ink);
  border: none; padding: 0;
}
.motto cite {
  display: block; font-style: normal; font-size: 14px; color: var(--ink-3);
  margin-top: 14px; font-family: var(--sans); letter-spacing: 0.02em;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 3px;
  font-size: 15px; font-weight: 600; text-decoration: none; transition: 0.15s ease;
  border: 1px solid transparent;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-ghost-invert { border: 1px solid rgba(255,255,255,0.35); color: #fff; }
.btn-ghost-invert:hover { border-color: #fff; }

/* Sub-page hero */
.hero-sub { padding: 64px 0 40px; }
.h1-sub { font-size: clamp(36px, 6vw, 52px); line-height: 1.05; margin: 0 0 14px; }

/* Chapter annotations */
.chapters-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--line); border: 1px solid var(--line); margin-top: 8px;
}
.chapter-card { background: var(--paper); padding: 30px 32px; }
.chapter-card .pillar-num { display: block; margin-bottom: 10px; }
.chapter-card h3 { font-size: 18px; margin: 0 0 10px; line-height: 1.3; }
.chapter-card p { font-size: 14.5px; color: var(--ink-2); line-height: 1.6; margin: 0; }

/* Bibliography list */
.biblio-list {
  list-style: decimal; margin: 0; padding: 0 0 0 26px;
  display: grid; gap: 16px; font-size: 15.5px; line-height: 1.6; color: var(--ink-2);
}
.biblio-list li::marker { color: var(--ink-3); font-family: var(--serif); }
.biblio-list em { color: var(--ink); font-style: italic; }

/* Sections */
.section { padding: 88px 0; }
.section-alt { background: var(--paper-2); }
.section-label {
  font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent-dark); font-weight: 700; margin: 0 0 22px;
}
.lead { font-size: 19px; line-height: 1.7; color: var(--ink); }
.lead-sm { font-size: 17px; color: var(--ink-2); margin: 0 0 32px; }
.section p { color: var(--ink); }
.section p + p { margin-top: 18px; }

.book-layout {
  display: grid; grid-template-columns: 300px 1fr; gap: 64px; align-items: start;
}
.book-cover {
  background: var(--paper-2); border: 1px solid var(--line); padding: 18px;
}
.book-frame {
  aspect-ratio: 3 / 4; overflow: hidden; border-radius: 2px;
}
.book-cover img {
  width: 100%; height: 100%; display: block;
  object-fit: cover; object-position: center 42%;
  transform: scale(1.2);
}

.pillars {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
  margin: 40px 0; padding: 32px 0; border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.pillar-num {
  font-family: var(--serif); font-size: 14px; color: var(--ink-3); font-weight: 600;
}
.pillar h3 { font-size: 17px; margin: 10px 0 8px; }
.pillar p { font-size: 14.5px; color: var(--ink-2); line-height: 1.55; margin: 0; }

.meta-list {
  list-style: none; margin: 36px 0 0; padding: 0;
  display: flex; gap: 24px; flex-wrap: wrap; font-size: 14px; color: var(--ink-2);
}
.meta-list li::before { content: "· "; color: var(--line); }
.meta-list li:first-child::before { content: ""; }

/* TOC */
.toc { border-top: 1px solid var(--line); }
.toc-chapter { border-bottom: 1px solid var(--line); }
.toc-chapter summary {
  list-style: none; cursor: pointer; padding: 18px 0;
  display: flex; align-items: baseline; gap: 18px;
  font-family: var(--serif); font-size: 19px;
}
.toc-chapter summary::-webkit-details-marker { display: none; }
.toc-chapter summary::after {
  content: "+"; margin-left: auto; color: var(--ink-3); font-family: var(--sans);
  font-size: 18px; font-weight: 400;
}
.toc-chapter[open] summary::after { content: "–"; }
.toc-num { color: var(--accent-dark); font-weight: 600; min-width: 22px; }
.toc-title { color: var(--ink); }
.toc-sub {
  list-style: none; margin: 0; padding: 0 0 20px 40px;
  display: grid; gap: 9px; font-size: 14.5px; color: var(--ink-2);
}
.toc-sub li { display: flex; gap: 10px; }
.toc-sub li span { color: var(--ink-3); min-width: 40px; flex-shrink: 0; }
.toc-sub-sub { margin-left: 18px; font-size: 14px; opacity: 0.9; }
.toc-chapter-flat {
  padding: 18px 0; display: flex; align-items: baseline; gap: 18px;
  font-family: var(--serif); font-size: 19px;
}

/* Excerpt */
.excerpt {
  position: relative; font-family: var(--serif); font-size: 18.5px; line-height: 1.75;
  max-height: 560px; overflow: hidden; padding-bottom: 8px;
}
.excerpt p + p { margin-top: 20px; }
.excerpt .fade {
  position: absolute; bottom: 0; left: 0; right: 0; height: 140px;
  background: linear-gradient(to bottom, transparent, var(--paper));
}
.link-more {
  display: inline-block; margin-top: 28px; font-weight: 600; text-decoration: none;
}

/* Author */
.author { display: flex; gap: 40px; align-items: flex-start; }
.author-mark {
  flex-shrink: 0; width: 84px; height: 84px; border-radius: 50%;
  background: var(--ink); color: var(--paper); font-family: var(--serif);
  font-size: 26px; display: flex; align-items: center; justify-content: center;
}
.author-text h2 { font-size: 26px; margin-bottom: 16px; }
.author-text p + p { margin-top: 16px; }
.author-text p { color: var(--ink-2); font-size: 15.5px; line-height: 1.7; }

/* Tags */
.tag-list {
  list-style: none; margin: 0 0 22px; padding: 0;
  display: flex; flex-wrap: wrap; gap: 10px;
}
.tag-list li {
  border: 1px solid var(--line); padding: 7px 14px; border-radius: 20px;
  font-size: 14px; color: var(--ink-2);
}
.fineprint { font-size: 13.5px; color: var(--ink-3); margin: 0; }

/* CTA */
.section-cta { background: var(--ink); color: var(--paper); }
.section-label-invert { color: var(--accent); }
.get-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: rgba(255,255,255,0.14); margin-top: 8px; }
.get-card { background: var(--ink); padding: 34px; }
.get-card h3 { color: var(--paper); font-size: 21px; margin-bottom: 10px; }
.get-card p { color: rgba(255,255,255,0.68); font-size: 14.5px; margin: 0 0 22px; line-height: 1.6; }
.get-card .btn-primary { background: var(--accent); color: #1a1305; }
.get-card .btn-primary:hover { background: var(--accent-dark); }
.btn-row { display: flex; gap: 10px; }
.btn-row .btn { flex: 1; text-align: center; }
@media (max-width: 420px) {
  .btn-row { flex-direction: column; }
}

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; }
.footer-row {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 20px; flex-wrap: wrap; font-size: 13.5px; color: var(--ink-3); line-height: 1.7;
}
.footer-contact a { color: var(--ink-2); }

/* Responsive */
@media (max-width: 780px) {
  .site-nav { gap: 14px; }
  .site-nav a:not(.nav-cta) { display: none; }
  .hero { padding: 64px 0 52px; }
  .pillars { grid-template-columns: 1fr; gap: 26px; }
  .book-layout { grid-template-columns: 1fr; gap: 32px; }
  .book-cover { max-width: 220px; margin: 0 auto; }
  .chapters-grid { grid-template-columns: 1fr; }
  .author { flex-direction: column; gap: 20px; }
  .get-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
}