:root {
  --text: #222;
  --muted: #777;
  --link: #2563eb;
  --bg: #fafafa;
  --border: #e5e5e5;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

a { color: var(--link); }
a:hover { text-decoration: underline; }

header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.nav-links a {
  margin-left: 1rem;
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover { color: var(--text); }

h1 { font-size: 2rem; margin-top: 0; }
h2 { font-size: 1.5rem; margin-top: 2rem; }

.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.post-list time {
  color: var(--muted);
  font-size: 0.875rem;
  white-space: nowrap;
}

.post-header time {
  display: block;
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.post-content { margin-bottom: 3rem; }

.back-link {
  margin-top: 3rem;
  font-size: 0.95rem;
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}