:root {
  --ink: #16181d;
  --muted: #5b616e;
  --line: #e4e6eb;
  --bg: #fbfbf9;
  --card: #ffffff;
  --accent: #0f6e5a;
  --max: 46rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--accent); text-underline-offset: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.75rem;
}

.brand { font-weight: 700; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
.brand span { color: var(--accent); }

nav a { margin-left: 1.25rem; color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--ink); }

main.wrap { padding-top: 3rem; padding-bottom: 4rem; }

h1 { font-size: 2.25rem; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 1rem; }
h2 { font-size: 1.3rem; margin: 2.5rem 0 0.75rem; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; }

.lead { font-size: 1.2rem; color: var(--muted); margin: 0 0 2rem; }
.updated { color: var(--muted); font-size: 0.95rem; margin: -0.5rem 0 2rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.card h2 { margin-top: 0.25rem; }

ul { padding-left: 1.25rem; }
li { margin: 0.35rem 0; }

code { font-size: 0.92em; background: #f1f2ef; padding: 0.1em 0.35em; border-radius: 4px; }

footer.site {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  padding: 1.5rem 0 2.5rem;
}

footer.site a { color: var(--muted); margin-right: 1rem; }

@media (max-width: 560px) {
  h1 { font-size: 1.8rem; }
  nav a { margin-left: 0.9rem; }
}