:root {
  color-scheme: light;
  --bg: #fdfcf8;
  --paper: #ffffff;
  --text-main: #2b2826;
  --text-reading: #1f1d1c;
  --text-muted: #8c857e;
  --border: #e6dfd7;
  --accent-red: #9e3d32;
  --accent-green: #2d5a4c;
  --link: #2d5a4c;
  --status-text: #fffdf9;
  --shadow: 0 16px 32px rgba(43, 40, 38, 0.08);
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, sans-serif;
  --font-serif: "Charter", "Bitstream Charter", "Iowan Old Style", Georgia, serif;
  --spacer-sm: 8px;
  --spacer-md: 16px;
  --spacer-lg: 32px;
  --spacer-xl: 64px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1c1a19;
  --paper: #262322;
  --text-main: #dfdbd6;
  --text-reading: #ebe6df;
  --text-muted: #88827c;
  --border: #3b3633;
  --accent-red: #d96356;
  --accent-green: #5ca187;
  --link: #5ca187;
  --status-text: #1c1a19;
  --shadow: 0 16px 32px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-main);
  font-family: var(--font-ui);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacer-lg);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: var(--spacer-md) 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacer-lg);
}

.logo {
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.1;
}

.logo-accent {
  color: var(--accent-red);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacer-lg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacer-lg);
  font-size: 14px;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-muted);
  padding: 4px 0;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text-main);
}

.theme-toggle {
  display: inline-grid;
  width: 36px;
  height: 36px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--paper);
  color: var(--text-main);
  cursor: pointer;
  font: inherit;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.theme-icon {
  grid-area: 1 / 1;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.theme-icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-icon-moon {
  display: none;
}

html[data-theme="dark"] .theme-icon-sun {
  display: block;
}

main.container {
  padding-top: 48px;
  padding-bottom: 72px;
}

.hero,
.page-title,
.book-head {
  padding: var(--spacer-md) 0 48px;
}

.hero {
  max-width: 800px;
}

.hero h1,
.page-title h1,
.book-head h1,
.chapter-head h1 {
  max-width: 900px;
  margin: 0 0 var(--spacer-md);
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 400;
  line-height: 1.12;
}

.hero p,
.page-title p,
.book-head p {
  max-width: 720px;
  margin: 0 0 14px;
  color: var(--text-muted);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.6;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-red);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
}

.content-section {
  margin-top: 24px;
}

.content-section h2 {
  margin: 0 0 var(--spacer-lg);
  padding-bottom: var(--spacer-sm);
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 220px);
  justify-content: start;
  gap: 48px 32px;
  padding-bottom: var(--spacer-xl);
}

.book-card {
  display: flex;
  width: 220px;
  flex-direction: column;
  gap: var(--spacer-md);
  color: var(--text-main);
  text-decoration: none;
}

.book-card:hover,
.book-card:focus-visible,
.author-card:hover,
.author-card:focus-visible {
  text-decoration: none;
}

.book-card-cover-link {
  display: block;
  color: inherit;
}

.book-card-cover,
.book-cover-placeholder.is-card-cover {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--paper);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.4s ease,
    border-color 0.4s ease;
}

.book-card-cover {
  object-fit: cover;
}

.book-card:hover .book-card-cover,
.book-card:focus-visible .book-card-cover,
.book-card:hover .book-cover-placeholder.is-card-cover,
.book-card:focus-visible .book-cover-placeholder.is-card-cover {
  border-color: transparent;
  box-shadow: var(--shadow);
  transform: translateY(-6px);
}

.book-card-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.book-card-meta {
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
}

.card-title {
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.22;
  transition: color 0.2s ease;
}

.book-card:hover .card-title,
.book-card:focus-visible .card-title,
.author-card:hover .card-title,
.author-card:focus-visible .card-title {
  color: var(--accent-red);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.book-card-body small {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.45;
}

.status {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 20px;
  margin-top: 4px;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--accent-green);
  color: var(--status-text);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
}

.author-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 220px);
  justify-content: start;
  gap: 48px 32px;
}

.author-card {
  display: flex;
  width: 220px;
  flex-direction: column;
  gap: var(--spacer-md);
  color: var(--text-main);
  text-decoration: none;
}

.author-portrait,
.author-portrait-placeholder {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--paper);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.4s ease,
    border-color 0.4s ease;
}

.author-portrait {
  object-fit: cover;
}

.author-portrait-placeholder {
  display: grid;
  place-items: center;
  background:
    linear-gradient(155deg, color-mix(in srgb, var(--accent-green) 18%, transparent), transparent 44%),
    linear-gradient(25deg, color-mix(in srgb, var(--accent-red) 16%, transparent), transparent 50%),
    var(--paper);
}

.author-portrait-placeholder span {
  color: var(--accent-green);
  font-size: 40px;
  font-weight: 700;
}

.author-card:hover .author-portrait,
.author-card:focus-visible .author-portrait,
.author-card:hover .author-portrait-placeholder,
.author-card:focus-visible .author-portrait-placeholder {
  border-color: transparent;
  box-shadow: var(--shadow);
  transform: translateY(-6px);
}

.author-card-body {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.author-card-body small,
.author-card-body em {
  color: var(--text-muted);
  font-size: 14px;
  font-style: normal;
}

.book-head {
  display: grid;
  grid-template-columns: minmax(220px, 340px) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.book-breadcrumbs {
  margin-bottom: 24px;
}

.book-info {
  grid-column: 2;
}

.book-cover,
.chapter-image {
  display: block;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--paper);
}

.book-cover {
  grid-column: 1;
  grid-row: 1;
  max-width: 340px;
  justify-self: start;
}

.book-cover-placeholder {
  display: grid;
  width: min(100%, 360px);
  min-height: 540px;
  align-content: space-between;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background:
    linear-gradient(160deg, color-mix(in srgb, var(--accent-green) 18%, transparent), transparent 42%),
    linear-gradient(20deg, color-mix(in srgb, var(--accent-red) 16%, transparent), transparent 48%),
    var(--paper);
  color: var(--text-main);
  text-align: center;
}

.book-cover-placeholder span,
.book-cover-placeholder em {
  color: var(--text-muted);
  font-size: 14px;
  font-style: normal;
}

.book-cover-placeholder strong {
  align-self: center;
  font-family: var(--font-serif);
  font-size: 34px;
  font-weight: 400;
  line-height: 1.12;
}

.book-cover-placeholder.is-card-cover {
  min-height: auto;
  padding: 20px;
}

.book-cover-placeholder.is-card-cover strong {
  font-size: 24px;
}

.book-summary {
  max-width: 760px;
  margin-top: 22px;
  color: var(--text-reading);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.7;
}

.toc {
  display: grid;
}

.toc-row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  color: var(--text-main);
  text-decoration: none;
}

.toc-row:hover,
.toc-row:focus-visible {
  text-decoration: none;
}

.toc-row span {
  color: var(--text-muted);
  font-size: 14px;
}

.toc-row strong {
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.25;
}

.toc-row em {
  color: var(--text-muted);
  font-size: 14px;
  font-style: normal;
}

.toc-row:hover .link-title,
.toc-row:focus-visible .link-title {
  color: var(--accent-red);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.is-muted {
  color: var(--text-muted);
}

.breadcrumbs {
  margin: 0 0 var(--spacer-lg);
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.4;
  text-transform: uppercase;
}

.chapter {
  max-width: 760px;
  margin: 0 auto;
}

.chapter .breadcrumbs {
  padding: 0;
}

.chapter-head {
  margin: 0 auto var(--spacer-xl);
  text-align: center;
}

.chapter-head h1 {
  margin-left: auto;
  margin-right: auto;
}

.chapter-image {
  margin: 0 0 48px;
}

.chapter-text {
  color: var(--text-reading);
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.65;
}

.chapter-text p {
  margin: 0 0 28px;
}

.placeholder {
  color: var(--text-muted);
}

.chapter-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 18px;
  align-items: start;
  margin-top: 80px;
  padding-top: var(--spacer-lg);
  border-top: 1px solid var(--border);
}

.chapter-nav span:last-child {
  text-align: right;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: var(--spacer-md);
  padding: var(--spacer-lg) 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacer-md);
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--spacer-md);
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
    gap: var(--spacer-md);
  }

  .nav-links {
    gap: 20px;
    overflow-x: auto;
    white-space: nowrap;
  }

  main.container {
    padding-top: 40px;
  }

  .hero h1,
  .page-title h1,
  .book-head h1,
  .chapter-head h1 {
    font-size: 34px;
  }

  .book-head {
    display: block;
    padding-bottom: 28px;
  }

  .book-head::after {
    clear: both;
    content: "";
    display: block;
  }

  .book-info {
    grid-column: auto;
  }

  .book-cover {
    float: right;
    width: min(28vw, 112px);
    margin: 0 0 var(--spacer-md) var(--spacer-md);
  }

  .chapter-text {
    font-size: 18px;
  }
}

@media (max-width: 600px) {
  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 164px));
    gap: 32px 16px;
  }

  .book-card {
    width: 100%;
  }

  .author-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 164px));
    gap: 32px 16px;
  }

  .author-card {
    width: 100%;
  }

  .toc-row {
    grid-template-columns: 48px 1fr;
  }

  .toc-row em {
    grid-column: 2;
  }

  .chapter-nav {
    grid-template-columns: 1fr;
  }

  .chapter-nav span:last-child {
    text-align: left;
  }

  .site-footer {
    flex-direction: column;
  }
}