:root {
  --bg: #f7f6f2;
  --card: #ffffff;
  --ink: #1d2433;
  --muted: #5d6677;
  --accent: #1f3a6e;
  --line: #e3e1d9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161f;
    --card: #1a202c;
    --ink: #e8eaf0;
    --muted: #9aa4b6;
    --accent: #8fb0ee;
    --line: #2a3242;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}
article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 24px;
}
h1 { font-size: 1.55rem; line-height: 1.25; margin: 0 0 6px; }
h2 { font-size: 1.15rem; margin: 30px 0 8px; color: var(--accent); }
p, li { margin: 0 0 10px; }
ul, ol { padding-left: 22px; margin: 0 0 12px; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: 0.92rem; margin-bottom: 18px; }
.nav { margin: 0 0 16px; font-size: 0.95rem; }
.operator {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 14px;
  margin: 12px 0 16px;
}
.operator p { margin: 0 0 4px; }
table { width: 100%; border-collapse: collapse; margin: 8px 0 14px; font-size: 0.95rem; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
.cards { display: grid; gap: 12px; margin-top: 18px; }
.cards a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: var(--ink);
  background: var(--card);
}
.cards a b { color: var(--accent); display: block; margin-bottom: 2px; }
.cards a span { color: var(--muted); font-size: 0.93rem; }
footer { color: var(--muted); font-size: 0.88rem; margin-top: 22px; text-align: center; }