:root {
  --fg: #1a1a1a;
  --fg-muted: #6b6b6b;
  --bg: #fafafa;
  --bg-card: #ffffff;
  --border: #e5e5e5;
  --accent: #2a5a8a;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  background: var(--bg-card);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--fg);
  letter-spacing: -0.01em;
}

nav a {
  color: var(--fg-muted);
  text-decoration: none;
  margin-left: 20px;
  font-size: 0.95rem;
}

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

main {
  padding: 48px 0 64px;
}

main h1 {
  font-size: 1.7rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.lede {
  color: var(--fg-muted);
  margin: 0 0 36px;
  font-size: 1.05rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: border-color 0.15s ease;
}

.card:hover {
  border-color: #c5c5c5;
}

.card h2 {
  font-size: 1.2rem;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.card h2 a {
  color: var(--fg);
  text-decoration: none;
}

.card h2 a:hover {
  color: var(--accent);
}

.card .meta {
  color: var(--fg-muted);
  font-size: 0.85rem;
  margin: 0 0 10px;
}

.card p:last-child {
  margin-bottom: 0;
}

article.full {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 32px 36px;
}

article.full h1 {
  margin-top: 0;
  font-size: 1.7rem;
}

article.full .meta {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin: 0 0 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

article.full p {
  margin: 0 0 16px;
}

article.full h2 {
  font-size: 1.25rem;
  margin: 32px 0 12px;
}

article.full code {
  background: #f0f0f0;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.back {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.back:hover {
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: 64px;
  background: var(--bg-card);
  color: var(--fg-muted);
  font-size: 0.85rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 480px) {
  main {
    padding: 32px 0 48px;
  }
  .card {
    padding: 16px 18px;
  }
  article.full {
    padding: 24px 22px;
  }
}