:root {
  --bg: #fafaf7;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #555;
  --accent: #5b6cb0;
  --border: #e4e4dc;
  --radius: 6px;
  --max-width: 720px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  padding: 24px 24px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

header .wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

header .brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

header nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

header nav a {
  color: var(--muted);
  text-decoration: none;
}

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

main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
  width: 100%;
}

main h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

main h2 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

main p {
  margin-bottom: 16px;
  color: var(--text);
}

main ul {
  margin-left: 24px;
  margin-bottom: 16px;
}

main li {
  margin-bottom: 6px;
}

main a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

main .meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

main .lede {
  font-size: 18px;
  color: var(--muted);
  margin-bottom: 24px;
}

main .card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
}

footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 20px 24px;
  font-size: 13px;
  color: var(--muted);
}

footer .wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

footer a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
}

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

code {
  background: #f0efea;
  padding: 1px 6px;
  border-radius: 3px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}