/* Палитра обложки: CoverInk #0C2236, CoverSteel #2F6E95 (scripts/figures/gen_cover.py). */
:root {
  color-scheme: light dark;
  --bg: #f5f8fc;
  --text: #0c2236;
  --muted: #45607a;
  --accent: #2f6e95;
  --accent-ink: #ffffff;
  --border: rgba(12, 34, 54, 0.14);
  --panel: rgba(207, 224, 241, 0.45);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a1622;
    --text: #dde8f3;
    --muted: #9db4ca;
    --accent: #7fb2d9;
    --accent-ink: #0a1622;
    --border: rgba(191, 212, 233, 0.18);
    --panel: rgba(47, 110, 149, 0.18);
  }
}
* {
  box-sizing: border-box;
}
html {
  background: var(--bg);
}
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "PT Sans", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
main {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}
a {
  color: var(--accent);
}
.hero {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: center;
}
.cover img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  box-shadow: 0 12px 32px rgba(12, 34, 54, 0.18);
}
.kicker {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
h1 {
  margin: 0;
  font-size: 44px;
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.author {
  margin: 8px 0 4px;
  font-size: 20px;
  font-weight: 700;
}
.subtitle {
  margin: 0 0 24px;
  color: var(--muted);
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 16px;
}
.button {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  text-decoration: none;
}
.button.ghost {
  background: transparent;
  color: var(--accent);
}
.meta {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.meta a,
pre {
  font-family: "PT Mono", ui-monospace, monospace;
}
h2 {
  margin: 56px 0 12px;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.en {
  color: var(--muted);
  font-size: 15px;
}
.toc {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: chapter;
  columns: 2;
  column-gap: 40px;
}
.toc > li {
  break-inside: avoid;
  margin: 0 0 20px;
}
.toc .part {
  font-weight: 700;
}
.toc ol {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}
.toc ol li {
  counter-increment: chapter;
  padding-left: 2.2em;
  text-indent: -2.2em;
}
.toc ol li::before {
  content: counter(chapter) ".";
  display: inline-block;
  width: 2.2em;
  text-indent: 0;
  color: var(--muted);
}
.cite {
  margin: 0 0 8px;
}
details {
  font-size: 15px;
}
summary {
  cursor: pointer;
  color: var(--accent);
}
pre {
  overflow-x: auto;
  padding: 12px 16px;
  border-radius: 6px;
  background: var(--panel);
  font-size: 13px;
}
footer {
  margin-top: 56px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
}
@media (max-width: 640px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .cover {
    max-width: 200px;
  }
  h1 {
    font-size: 32px;
  }
  .toc {
    columns: 1;
  }
}