:root {
  --bg: #faf9f6;
  --fg: #23262b;
  --muted: #6b7280;
  --accent: #2f5d50;
  --line: #e5e2da;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.65;
  font-size: 18px;
}

header {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 20px 18px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.mark {
  font-size: 22px;
  font-weight: bold;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: 0.2px;
}
.mark span { color: var(--accent); }

nav a {
  margin-left: 18px;
  color: var(--muted);
  text-decoration: none;
  font-size: 16px;
}
nav a:hover { color: var(--accent); }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 30px 20px 60px;
}

h1 {
  font-size: 32px;
  line-height: 1.25;
  margin: 24px 0 18px;
}

h2 {
  font-size: 22px;
  margin: 42px 0 14px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

p { margin: 0 0 16px; }

.lede { font-size: 20px; }

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

ul.posts {
  list-style: none;
  padding: 0;
  margin: 0;
}
ul.posts li {
  padding: 8px 0;
  border-bottom: 1px dotted var(--line);
}
ul.posts .date {
  display: inline-block;
  min-width: 110px;
  color: var(--muted);
  font-size: 15px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 22px 20px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}
footer a { color: var(--muted); }

@media (max-width: 640px) {
  body { font-size: 17px; }
  h1 { font-size: 26px; }
  ul.posts .date { display: block; min-width: 0; }
}