:root {
  --bg: #fbfbfd;
  --panel: #ffffff;
  --text: #1c1d24;
  --muted: #5b5e6c;
  --line: #e4e5ee;
  --accent: #6b4ce6;
  --accent-soft: #efeafe;
  --code-bg: #f4f4f8;
  --warn: #9a5b00;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111218;
    --panel: #181a22;
    --text: #e6e7ee;
    --muted: #a0a3b3;
    --line: #2b2e3b;
    --accent: #a68cff;
    --accent-soft: #241f3d;
    --code-bg: #1f2130;
    --warn: #f0b35a;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); max-width: 1180px; margin: 0 auto; }
nav {
  position: sticky; top: 0; align-self: start; height: 100vh; overflow-y: auto;
  padding: 28px 18px; border-right: 1px solid var(--line);
}
nav .brand { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; display: block; margin-bottom: 18px; }
nav .brand span { color: var(--accent); }
nav a { display: block; color: var(--muted); text-decoration: none; padding: 4px 8px; border-radius: 6px; font-size: 0.93rem; }
nav a:hover { color: var(--text); background: var(--accent-soft); }
nav .group { margin: 16px 0 6px; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
main { padding: 36px 48px 80px; min-width: 0; }
h1 { font-size: 2.1rem; margin: 0 0 8px; line-height: 1.2; }
h2 { font-size: 1.45rem; margin: 44px 0 10px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 1.1rem; margin: 28px 0 8px; }
p, li { color: var(--text); }
.lead { font-size: 1.12rem; color: var(--muted); max-width: 46rem; }
a { color: var(--accent); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; overflow-x: auto; }
pre code { background: none; padding: 0; font-size: 0.88rem; line-height: 1.5; }
pre[data-checked]::before { content: "проверяется тестом"; display: block; font: 0.7rem/1 -apple-system, sans-serif; color: var(--muted); margin-bottom: 6px; }
.note { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: 10px 14px; border-radius: 0 8px 8px 0; margin: 16px 0; }
.note.warn { border-left-color: var(--warn); }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 0.93rem; }
th, td { text-align: left; border-bottom: 1px solid var(--line); padding: 7px 10px; vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin: 18px 0; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.card b { display: block; margin-bottom: 4px; }
.flow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 12px 0; }
.flow span { background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 0.9rem; }
.flow i { color: var(--muted); font-style: normal; }
@media (max-width: 800px) {
  .layout { display: block; }
  nav { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 16px; }
  main { padding: 24px 16px 60px; }
}
pre.output { background: var(--panel); color: var(--muted); font: 0.84rem/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; margin-top: -6px; }
pre.output::before { content: "вывод"; display: block; font: 0.7rem/1 -apple-system, sans-serif; color: var(--muted); margin-bottom: 6px; }