/* Статические страницы тем /temy/ (app.cli.export_topic_pages). Тот же мир, что у
   приложения: миллиметровка, графит, маркер. Всё оформление — здесь: CSP сайта
   (style-src 'self') не пускает атрибуты style и встроенные стили. Формулы — MathML,
   их рисует браузер, CSS и шрифты KaTeX не нужны. */

@font-face {
  font-family: "Unbounded";
  src: url("../fonts/unbounded-cyrillic.woff2") format("woff2");
  font-weight: 200 900;
  font-display: swap;
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: "Unbounded";
  src: url("../fonts/unbounded-latin.woff2") format("woff2");
  font-weight: 200 900;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Golos Text";
  src: url("../fonts/golos-text-cyrillic.woff2") format("woff2");
  font-weight: 400 900;
  font-display: swap;
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: "Golos Text";
  src: url("../fonts/golos-text-latin.woff2") format("woff2");
  font-weight: 400 900;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  color-scheme: light dark;
  --canvas: #ecf0ee;
  --grid: #dde5e1;
  --paper: #fbfcfb;
  --paper-sunk: #f1f5f3;
  --line: #c9d4cf;
  --ink: #16201c;
  --ink-soft: #4a5853;
  --accent: #16201c;
  --accent-hover: #2f3c37;
  --on-accent: #ffffff;
  --accent-text: #4b5c00;
  --marker: #dff55a;
  --marker-soft: #f3fac6;
  --focus: #2d59f0;
  --font-display: "Unbounded", "Golos Text", ui-sans-serif, sans-serif;
  --font-text: "Golos Text", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #111715;
    --grid: #19211e;
    --paper: #182020;
    --paper-sunk: #131a19;
    --line: #2d3a37;
    --ink: #e3ebe7;
    --ink-soft: #9fb0aa;
    --accent: #d4ee45;
    --accent-hover: #e2f877;
    --on-accent: #16201c;
    --accent-text: #d4ee45;
    --marker: #d4ee45;
    --marker-soft: #252e12;
    --focus: #8aa6ff;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100dvh;
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  background-color: var(--canvas);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 40px 40px;
  background-attachment: fixed;
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration-color: var(--line);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: var(--accent-text);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection {
  background: var(--marker);
  color: #16201c;
}

.bar,
.crumbs,
.sheet,
.foot {
  max-width: 46rem;
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.9rem;
  padding-bottom: 0.4rem;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.bar__link {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  margin: 0;
  padding: 0.25rem 0 0.75rem;
  list-style: none;
  color: var(--ink-soft);
  font-size: 0.875rem;
}

.crumbs li + li::before {
  content: "›";
  margin-right: 0.5rem;
  color: var(--line);
}

.sheet {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-bottom: 2rem;
}

.hero,
.block {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.25rem 1.1rem;
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.kicker {
  margin: 0;
  color: var(--accent-text);
  font-size: 0.9rem;
  font-weight: 600;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(1.7rem, 6.5vw, 2.6rem);
  letter-spacing: -0.04em;
  hyphens: manual;
}

h2 {
  font-size: clamp(1.2rem, 4vw, 1.45rem);
  margin-bottom: 0.75rem;
  hyphens: auto;
}

h3 {
  font-family: var(--font-text);
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin-bottom: 0.35rem;
}

p {
  margin: 0 0 0.75rem;
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.headline {
  font-weight: 650;
}

.prose ul,
.definitions,
.notation,
.steps {
  margin: 0;
  padding-left: 1.25rem;
}

.prose li,
.definitions li,
.notation li,
.steps li {
  margin-bottom: 0.5rem;
}

.prose li::marker,
.definitions li::marker,
.notation li::marker {
  color: var(--accent-text);
}

.key-idea {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: var(--marker-soft);
}

.cta {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0.7rem 1.15rem;
  border-radius: 10px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 650;
  text-decoration: none;
}

.cta:hover {
  background: var(--accent-hover);
}

.block--cta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: var(--marker-soft);
}

.block--cta .cta {
  margin-top: 0.5rem;
}

.formulas,
.notebook__lines {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.formula,
.notebook__lines li {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: var(--paper-sunk);
  border: 1px solid var(--line);
  min-width: 0;
}

.notebook__lines {
  counter-reset: line;
  margin-bottom: 1rem;
}

.formula__math,
.formula__tex {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0;
}

.formula__tex {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95rem;
}

.formula__note {
  margin-top: 0.35rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

math {
  font-size: 1.12em;
}

math[display="block"] {
  margin: 0.25rem 0;
  font-size: 1.3em;
}

.katex {
  white-space: normal;
}

.figure {
  margin: 0;
  padding: 0.5rem;
  border-radius: 10px;
  background: #fbfcfb;
}

.figure svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 24rem;
}

.topic-list {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.topic-list a {
  font-weight: 600;
}

.topic-list .muted {
  display: block;
  margin: 0.15rem 0 0;
}

.muted {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.foot {
  padding-bottom: 2rem;
  color: var(--ink-soft);
  font-size: 0.875rem;
}

@media (min-width: 720px) {
  .hero,
  .block {
    padding: 1.75rem 2rem;
  }

  .hero {
    padding-top: 2.25rem;
    padding-bottom: 2.25rem;
  }

  .topic-list--wide {
    grid-template-columns: 1fr 1fr;
    gap: 1rem 1.5rem;
  }
}