:root {
  --ink: #1c1917;
  --mut: #78716c;
  --soft: #57534e;
  --line: #e7e5e4;
  --bg: #fafaf9;
  --card: #fff;
  --ok: #047857;
  --ok-bg: #ecfdf5;
  --warn: #b45309;
  --warn-bg: #fffbeb;
  --bad: #b91c1c;
  --bad-bg: #fef2f2;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0 auto;
  max-width: 40rem;
  padding: 1.5rem 1.1rem 4rem;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  font-size: 1.05rem;
}
p { margin: 1rem 0; }
p b {
  font-family: system-ui, -apple-system, sans-serif;
  font-weight: 650;
  font-size: 0.95em;
}
.lead {
  color: var(--soft);
  font-size: 1.12rem;
  font-style: italic;
  margin: 0 0 1.4rem;
  line-height: 1.55;
}
.ui { font-family: system-ui, -apple-system, sans-serif; }
.back a { color: var(--mut); font-size: 0.85rem; text-decoration: none; }
.back a:hover { text-decoration: underline; }
h1 {
  font-size: 1.7rem;
  line-height: 1.25;
  margin: 0.75rem 0 0.4rem;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
}
h2 {
  font-size: 1.2rem;
  margin: 2.4rem 0 0.7rem;
  font-family: system-ui, sans-serif;
  font-weight: 650;
}
h3 {
  font-size: 1rem;
  margin: 1.4rem 0 0.4rem;
  font-family: system-ui, sans-serif;
}
.sub {
  color: var(--mut);
  margin: 0 0 1.2rem;
  font-family: system-ui, sans-serif;
  font-size: 0.95rem;
}
a { color: #1d4ed8; }
.badge {
  font-size: 0.7rem;
  background: var(--ok-bg);
  color: var(--ok);
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  margin-left: 0.25rem;
  font-family: system-ui, sans-serif;
  font-weight: 600;
  vertical-align: middle;
}
.grid { display: grid; gap: 0.7rem; margin: 0.9rem 0; }
.card {
  display: block;
  padding: 0.95rem 1.05rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  font-family: system-ui, sans-serif;
}
.card:hover { border-color: #d6d3d1; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.card strong { display: block; margin-bottom: 0.2rem; }
.card span { font-size: 0.88rem; color: var(--soft); }
.card.live { border-color: var(--ink); }
.note, .callout {
  font-family: system-ui, sans-serif;
  font-size: 0.92rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin: 1rem 0;
}
.callout.warn { background: var(--warn-bg); border-color: #fcd34d; }
.callout.ok { background: var(--ok-bg); border-color: #6ee7b7; }
.callout.bad { background: var(--bad-bg); border-color: #fecaca; }
.check {
  list-style: none;
  padding: 0;
  margin: 0.8rem 0;
  font-family: system-ui, sans-serif;
}
.check li {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  padding: 0.45rem 0;
  border-bottom: 1px solid #f5f5f4;
  font-size: 0.95rem;
}
.check li:last-child { border-bottom: none; }
.check input { margin-top: 0.25rem; }
.toc {
  font-family: system-ui, sans-serif;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin: 1.1rem 0 1.6rem;
}
.toc ol { margin: 0.4rem 0 0; padding-left: 1.2rem; }
.toc li { margin: 0.25rem 0; font-size: 0.92rem; }
.toc a { color: var(--ink); text-decoration: none; }
.toc a:hover { text-decoration: underline; }
figure {
  margin: 1.3rem 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.65rem;
  overflow: hidden;
}
figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  background: #111;
}
figcaption {
  font-family: system-ui, sans-serif;
  font-size: 0.84rem;
  color: var(--mut);
  margin-top: 0.55rem;
  padding: 0 0.25rem 0.2rem;
}
.q {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  padding: 1rem;
  margin: 1.4rem 0;
}
.q .tag {
  font-family: system-ui, sans-serif;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--mut);
  margin-bottom: 0.35rem;
}
.q .ask {
  font-family: system-ui, sans-serif;
  font-size: 1.02rem;
  font-weight: 600;
  margin: 0.2rem 0 0.75rem;
}
.q details {
  font-family: system-ui, sans-serif;
  margin-top: 0.7rem;
  border-top: 1px dashed var(--line);
  padding-top: 0.65rem;
}
.q summary {
  cursor: pointer;
  color: #1d4ed8;
  font-weight: 600;
  list-style: none;
}
.q summary::-webkit-details-marker { display: none; }
.q summary::before { content: "▸ "; }
.q details[open] summary::before { content: "▾ "; }
.q .ans { margin-top: 0.55rem; color: var(--soft); font-size: 0.95rem; line-height: 1.55; }
.q .ans b { color: var(--ink); }
.nums {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 0.55rem;
  margin: 1rem 0;
  font-family: system-ui, sans-serif;
}
.nums div {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
}
.nums strong { display: block; font-size: 1.15rem; }
.nums span { font-size: 0.8rem; color: var(--mut); }
.nav-bottom {
  margin-top: 2.8rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: system-ui, sans-serif;
  font-size: 0.9rem;
  flex-wrap: wrap;
}
.steps { counter-reset: step; margin: 1rem 0; padding: 0; list-style: none; }
.steps li {
  position: relative;
  padding: 0.85rem 0.9rem 0.85rem 3rem;
  margin: 0.55rem 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-family: system-ui, sans-serif;
  font-size: 0.95rem;
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0.75rem;
  top: 0.85rem;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 700;
}
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0 1.2rem; }
.chips a {
  font-family: system-ui, sans-serif;
  font-size: 0.82rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}
.chips a:hover, .chips a.active { background: var(--ink); color: #fff; border-color: var(--ink); }
table {
  width: 100%;
  border-collapse: collapse;
  font-family: system-ui, sans-serif;
  font-size: 0.9rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  margin: 0.9rem 0;
}
th, td { padding: 0.55rem 0.7rem; text-align: left; border-bottom: 1px solid #f5f5f4; vertical-align: top; }
th { background: #fafaf9; font-weight: 600; }
tr:last-child td { border-bottom: none; }
.say {
  font-family: system-ui, sans-serif;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  padding: 0.65rem 0.85rem;
  margin: 0.55rem 0 0;
  font-size: 0.92rem;
  color: #1e3a8a;
  line-height: 1.45;
}
.say::before {
  content: "На экзамене скажи: ";
  font-weight: 700;
  color: #1d4ed8;
}
.memo {
  font-family: system-ui, sans-serif;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  margin: 0.9rem 0 1.2rem;
}
.memo th, .memo td {
  padding: 0.55rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid #f5f5f4;
  vertical-align: top;
}
.memo th { background: #fafaf9; font-weight: 600; width: 38%; }
.memo tr:last-child td, .memo tr:last-child th { border-bottom: none; }
.memo td b { color: var(--ink); }
.faq details {
  font-family: system-ui, sans-serif;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem 0.95rem;
  margin: 0.55rem 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 650;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "▸ "; color: var(--mut); }
.faq details[open] summary::before { content: "▾ "; }
.faq .a { margin: 0.55rem 0 0.15rem; color: var(--soft); font-size: 0.95rem; line-height: 1.55; }
.faq .a b { color: var(--ink); }
.path {
  font-family: system-ui, sans-serif;
  display: grid;
  gap: 0.45rem;
  margin: 1rem 0 1.3rem;
}
.path .row {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.6rem;
  align-items: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  font-size: 0.92rem;
}
.path .if {
  font-weight: 700;
  color: var(--warn);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
@media (max-width: 560px) {
  body { padding: 1.1rem 0.85rem 3rem; }
  h1 { font-size: 1.4rem; }
  .path .row { grid-template-columns: 1fr; }
}