:root {
  --fg: #17181a;
  --muted: #5f6771;
  --line: #e5e7eb;
  --accent: #2f6f5e;
  --bg: #fdfdfc;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
header { border-bottom: 1px solid var(--line); background: var(--bg); }
header .wrap { display: flex; align-items: baseline; justify-content: space-between; height: 68px; }
.brand { font-weight: 650; letter-spacing: -0.015em; font-size: 17px; text-decoration: none; color: var(--fg); }
nav a { color: var(--muted); text-decoration: none; margin-left: 22px; font-size: 15px; }
nav a:hover, nav a[aria-current] { color: var(--accent); }
main { padding: 64px 0 80px; }
h1 { font-size: 34px; line-height: 1.22; letter-spacing: -0.025em; margin: 0 0 18px; font-weight: 680; }
h2 { font-size: 21px; letter-spacing: -0.01em; margin: 40px 0 10px; }
p, li { color: var(--muted); }
p.lead { font-size: 19px; color: var(--fg); }
a { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
ul { padding-left: 20px; }
li { margin: 6px 0; }
.post-list { list-style: none; padding: 0; }
.post-list li { border-top: 1px solid var(--line); padding: 18px 0; margin: 0; }
.post-list a { font-size: 18px; text-decoration: none; color: var(--fg); letter-spacing: -0.01em; }
.post-list a:hover { color: var(--accent); }
.post-list time { display: block; font-size: 14px; color: var(--muted); margin-top: 4px; }
code { background: #f2f4f3; padding: 2px 6px; border-radius: 4px; font-size: 15px; }
footer { border-top: 1px solid var(--line); padding: 28px 0; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--fg); }