:root {
  --ink: #16171a;
  --muted: #5c6068;
  --rule: #e4e6ea;
  --accent: #1a56db;
  --code-bg: #f5f6f8;
  --flag: #b42318;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--rule);
  padding: 18px 24px;
}

.wordmark {
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
  font-size: 18px;
}
.wordmark b { font-weight: 700; color: var(--accent); }

main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 40px 24px 72px;
}

h1 {
  font-size: 2.1rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin: 0 0 1.2rem;
}

h2 {
  font-size: 1.35rem;
  letter-spacing: -0.015em;
  margin: 2.6rem 0 0.9rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule);
}

h3 { font-size: 1.05rem; margin: 1.8rem 0 0.6rem; }

p, li { color: var(--ink); }
main > p:first-of-type { font-size: 1.1rem; color: var(--muted); }

a { color: var(--accent); }

strong { font-weight: 650; }

blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
  font-style: italic;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.87em;
  background: var(--code-bg);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
}
pre code { background: none; padding: 0; font-size: inherit; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: 0.93rem;
  display: block;
  overflow-x: auto;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: 9px 12px;
  border-bottom: 1px solid var(--rule);
}

th {
  font-weight: 620;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-bottom: 2px solid var(--rule);
}

tbody tr:hover { background: #fafbfc; }

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.6rem 0;
}

footer {
  border-top: 1px solid var(--rule);
  padding: 22px 24px 48px;
  color: var(--muted);
  font-size: 0.88rem;
}
footer p { max-width: 46rem; margin: 0 auto; }

@media (max-width: 640px) {
  main { padding: 28px 18px 56px; }
  h1 { font-size: 1.7rem; }
}