:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5b6474;
  --line: #dfe4ec;
  --panel: #f6f8fb;
  --accent: #2457d6;
  --max: 820px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.65;
}
a { color: var(--accent); }
header { border-bottom: 1px solid var(--line); background: #fff; }
nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 22px;
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 800; letter-spacing: .01em; }
nav .links { display: flex; gap: 16px; flex-wrap: wrap; }
nav a { text-decoration: none; font-weight: 600; }
main { max-width: var(--max); margin: 0 auto; padding: 48px 22px 64px; }
h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1; margin: 0 0 10px; }
h2 { margin-top: 36px; line-height: 1.25; }
p, li { color: var(--ink); }
.meta { color: var(--muted); margin-bottom: 34px; }
.notice {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 26px 0;
}
figure { margin: 28px 0; }
figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
}
figcaption { color: var(--muted); font-size: .95rem; margin-top: 10px; }
footer { border-top: 1px solid var(--line); background: var(--panel); }
footer div { max-width: var(--max); margin: 0 auto; padding: 26px 22px; color: var(--muted); }
code { background: var(--panel); padding: .12rem .35rem; border-radius: 4px; }
@media (max-width: 640px) {
  nav { align-items: flex-start; flex-direction: column; gap: 10px; }
}