:root {
  color-scheme: light;
  --ink: #16202a;
  --muted: #5b6874;
  --line: #d9e1e7;
  --paper: #f5f7f8;
  --card: #ffffff;
  --accent: #d84b2a;
  --accent-dark: #a72f15;
  --blue: #173f5f;
  --max: 1120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(216,75,42,.10), transparent 31rem),
    linear-gradient(180deg, #fff 0, var(--paper) 34rem);
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.68;
}
body > header, body > nav, body > main, body > footer { width: min(var(--max), calc(100% - 32px)); margin-inline: auto; }
body > header { padding: 76px 0 34px; border-bottom: 1px solid var(--line); }
header h1 { max-width: 900px; margin: 0; color: var(--blue); font-size: clamp(2.2rem, 6vw, 4.8rem); line-height: 1.02; letter-spacing: -.045em; }
header .subtitle { max-width: 760px; margin: 24px 0 0; color: var(--muted); font-size: 1.08rem; }
#TOC { margin-top: 28px; padding: 22px 26px; background: rgba(255,255,255,.88); border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 16px 42px rgba(23,63,95,.08); }
#TOC::before { content: "Содержание"; display: block; margin-bottom: 12px; color: var(--blue); font-size: 1.15rem; font-weight: 750; }
#TOC ul { margin: 0; padding-left: 1.2rem; columns: 2; column-gap: 40px; }
#TOC li { break-inside: avoid; margin: .22rem 0; }
#TOC a { color: var(--blue); text-decoration: none; }
#TOC a:hover { color: var(--accent); }
main { padding: 48px 0 90px; }
h2 { margin: 72px 0 22px; padding-top: 12px; color: var(--blue); font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.15; letter-spacing: -.025em; border-top: 3px solid var(--accent); }
h3 { margin: 48px 0 18px; color: var(--blue); font-size: clamp(1.25rem, 2vw, 1.65rem); line-height: 1.25; }
p, li { max-width: 88ch; }
a { color: var(--accent-dark); text-underline-offset: 3px; }
blockquote { margin: 18px 0; padding: 16px 20px; background: #fff8f4; border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; }
blockquote p { margin: 0; }
table { width: 100%; border-collapse: collapse; margin: 22px 0 34px; background: var(--card); border-radius: 12px; overflow: hidden; box-shadow: 0 8px 25px rgba(23,63,95,.06); }
th, td { padding: 13px 15px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { background: var(--blue); color: #fff; }
img { max-width: 100%; height: auto; margin: 14px 8px 18px 0; border-radius: 12px; box-shadow: 0 10px 28px rgba(22,32,42,.14); vertical-align: top; }
strong { color: #122f46; }
code { overflow-wrap: anywhere; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
footer { padding: 28px 0 42px; color: var(--muted); border-top: 1px solid var(--line); }
@media (max-width: 760px) {
  body > header, body > nav, body > main, body > footer { width: min(100% - 22px, var(--max)); }
  body > header { padding-top: 46px; }
  #TOC ul { columns: 1; }
  img[width="48%"], img[width="32%"] { width: 100% !important; }
  table { display: block; overflow-x: auto; }
}