:root {
  color-scheme: light;
  --page: #fff;
  --ink: #171717;
  --muted: #696969;
  --line: #dedede;
  --soft: #f5f5f3;
  --focus: #676767;
  --reader-width: 720px;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #080808;
  --ink: #f3f3f3;
  --muted: #b5b5b5;
  --line: #383838;
  --soft: #171717;
  --focus: #bcbcbc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--page); }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  transition: background-color .18s ease, color .18s ease;
}
a { color: inherit; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
.site-header {
  width: min(1120px, calc(100% - 48px));
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  font-family: Arial, sans-serif;
}
.brand {
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: 12px;
  font-weight: 600;
}
.header-actions { display: flex; align-items: center; gap: 20px; }
.theme-toggle, .toc-toggle {
  border: 0;
  background: transparent;
  padding: 9px 0;
  cursor: pointer;
  font: 11px/1.2 Arial, sans-serif;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.theme-toggle span { color: var(--muted); margin-left: 5px; }
.toc-toggle { border-bottom: 1px solid var(--line); }
.hero {
  width: min(1040px, calc(100% - 48px));
  min-height: 650px;
  margin: 0 auto;
  padding: 88px 0 92px;
  display: grid;
  grid-template-columns: minmax(230px, 380px) minmax(280px, 1fr);
  gap: clamp(44px, 9vw, 120px);
  align-items: center;
}
.cover-wrap { display: flex; justify-content: center; }
.cover-image {
  display: block;
  width: min(100%, 340px);
  aspect-ratio: 2 / 3;
  object-fit: cover;
  background: var(--soft);
  border: 1px solid var(--line);
}
.cover-placeholder {
  width: min(100%, 340px);
  aspect-ratio: 2 / 3;
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  text-align: center;
  border: 1px solid var(--line);
  background: var(--soft);
}
.cover-placeholder .cover-kicker { font: 10px Arial, sans-serif; letter-spacing: .22em; text-transform: uppercase; }
.cover-placeholder strong { max-width: 270px; font-size: clamp(28px, 4vw, 42px); line-height: 1.08; font-weight: 400; }
.cover-placeholder small { font: 11px Arial, sans-serif; letter-spacing: .2em; text-transform: uppercase; }
.hero-copy { max-width: 540px; }
.eyebrow { color: var(--muted); font: 11px Arial, sans-serif; text-transform: uppercase; letter-spacing: .2em; }
.hero h1 { margin: 18px 0 24px; font-size: clamp(38px, 5vw, 62px); line-height: 1.04; font-weight: 400; }
.hero-description { color: var(--muted); font-size: 19px; line-height: 1.8; white-space: pre-line; }
.author-line { margin-top: 30px; font: 12px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }
.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  margin-top: 34px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  text-decoration: none;
  font: 11px Arial, sans-serif;
  letter-spacing: .12em;
  transition: background .15s ease, color .15s ease;
}
.primary-link:hover { background: var(--ink); color: var(--page); }
.toc-section { width: min(var(--reader-width), calc(100% - 48px)); margin: 0 auto 90px; padding-top: 32px; border-top: 1px solid var(--line); }
.toc-heading { margin: 0 0 22px; font-size: 24px; font-weight: 400; }
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { border-top: 1px solid var(--line); }
.toc-list a { display: flex; justify-content: space-between; gap: 20px; padding: 16px 0; text-decoration: none; font-size: 16px; }
.toc-list a:hover { opacity: .65; }
.toc-number { color: var(--muted); font: 10px Arial, sans-serif; letter-spacing: .12em; }
.reader { width: min(var(--reader-width), calc(100% - 48px)); margin: 0 auto; padding: 58px 0 80px; }
.chapter-kicker { margin: 10px 0 12px; text-align: center; color: var(--muted); font: 10px Arial, sans-serif; text-transform: uppercase; letter-spacing: .2em; }
.chapter-title { margin: 0 0 44px; text-align: center; font-size: clamp(32px, 5vw, 46px); line-height: 1.15; font-weight: 400; }
.chapter-body { font-size: 19px; line-height: 1.9; overflow-wrap: break-word; }
.chapter-body p { margin: 0 0 1.45em; }
.chapter-body h2 { margin: 2.2em 0 .8em; font-size: 27px; line-height: 1.25; font-weight: 400; }
.chapter-body h3 { margin: 2em 0 .7em; font-size: 22px; font-weight: 400; }
.chapter-body blockquote { margin: 2em 0; padding: 0 0 0 22px; border-left: 1px solid var(--line); color: var(--muted); font-style: italic; }
.chapter-body ul, .chapter-body ol { margin: 0 0 1.5em; padding-left: 1.5em; }
.chapter-body figure { margin: 2.5em 0; }
.chapter-body figure img { display: block; max-width: 100%; height: auto; margin: 0 auto; }
.chapter-body figcaption { margin-top: 10px; text-align: center; color: var(--muted); font: 12px/1.5 Arial, sans-serif; }
.chapter-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; width: min(var(--reader-width), calc(100% - 48px)); margin: 24px auto 42px; }
.chapter-nav a { min-height: 54px; display: flex; align-items: center; gap: 12px; text-decoration: none; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font: 11px Arial, sans-serif; letter-spacing: .08em; text-transform: uppercase; }
.chapter-nav a:last-child { justify-content: flex-end; text-align: right; }
.chapter-nav a:hover { opacity: .6; }
.chapter-nav .nav-arrow { font-size: 18px; }
.empty-state, .error-state { width: min(var(--reader-width), calc(100% - 48px)); margin: 90px auto; text-align: center; color: var(--muted); line-height: 1.7; }
.site-footer { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 28px 0 34px; border-top: 1px solid var(--line); text-align: center; color: var(--muted); font: 10px Arial, sans-serif; letter-spacing: .12em; }
.loading-screen { padding: 100px 20px; text-align: center; color: var(--muted); font-size: 16px; }
.hidden { display: none !important; }
@media (max-width: 700px) {
  .site-header { width: calc(100% - 32px); min-height: 68px; gap: 10px; }
  .brand { max-width: 48%; font-size: 10px; line-height: 1.5; }
  .header-actions { gap: 13px; }
  .theme-toggle, .toc-toggle { font-size: 9px; }
  .hero { width: calc(100% - 40px); min-height: 0; padding: 45px 0 64px; grid-template-columns: 1fr; gap: 42px; }
  .cover-image, .cover-placeholder { width: min(68%, 260px); }
  .hero-copy { text-align: center; margin: 0 auto; }
  .hero h1 { font-size: 39px; }
  .hero-description { font-size: 17px; }
  .reader { width: calc(100% - 40px); padding: 36px 0 54px; }
  .chapter-body { font-size: 18px; line-height: 1.82; }
  .chapter-nav { width: calc(100% - 40px); gap: 12px; }
  .chapter-nav a { font-size: 9px; letter-spacing: .04em; }
  .toc-section { width: calc(100% - 40px); margin-bottom: 60px; }
  .site-footer { width: calc(100% - 40px); }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; } }