:root {
  --text: #24292f;
  --muted: #57606a;
  --line: #d8dee4;
  --accent: #0b6e6e;
  --bg: #fcfcfb;
}

* { box-sizing: border-box; }

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

header, main, footer {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 34px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.sitename {
  font-weight: 700;
  font-size: 21px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

nav a {
  margin-left: 16px;
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

nav a:hover, main a:hover { color: var(--accent); }

main { padding-top: 30px; padding-bottom: 40px; }

.lede { color: var(--muted); margin-top: 0; }

.postlist { list-style: none; margin: 0; padding: 0; }

.postlist li {
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--line);
}

.postlist time {
  display: block;
  color: var(--muted);
  font-size: 13.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 3px;
}

.postlist a {
  color: var(--text);
  font-weight: 600;
  font-size: 19px;
  text-decoration: none;
}

.excerpt { margin: 5px 0 0; color: var(--muted); font-size: 15.5px; }

article h1 {
  font-size: 27px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 6px 0 4px;
}

article time.postdate {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 26px;
}

article p { margin: 0 0 18px; }

article h2 { font-size: 20px; margin: 30px 0 12px; }

article blockquote {
  margin: 0 0 18px;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

code, pre {
  font-family: "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 14px;
  background: #f2f4f5;
}

code { padding: 1px 5px; border-radius: 4px; }

pre {
  padding: 14px 16px;
  border-radius: 6px;
  border: 1px solid var(--line);
  overflow-x: auto;
  margin: 0 0 18px;
}

pre code { padding: 0; background: none; }

.backlink { font-size: 14.5px; color: var(--muted); margin-top: 30px; }

footer {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  padding-bottom: 44px;
  color: var(--muted);
  font-size: 14px;
}

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

@media (max-width: 560px) {
  header { padding-top: 24px; }
  article h1 { font-size: 23px; }
}