:root {
  --bg: #ffffff;
  --bg-elevated: #f7f7f5;
  --text: #1a1a1a;
  --text-muted: #5a5a5a;
  --link: #1849a9;
  --link-hover: #0f2f6e;
  --border: #e6e6e3;
  --callout-bg: #fff8e6;
  --callout-border: #e8c659;
  --safety-bg: #fdecec;
  --safety-border: #d97070;
  --max-width: 70ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f10;
    --bg-elevated: #1a1a1c;
    --text: #e8e8e6;
    --text-muted: #a3a3a0;
    --link: #87b1f0;
    --link-hover: #b6cef6;
    --border: #2a2a2c;
    --callout-bg: #2a2412;
    --callout-border: #7a6529;
    --safety-bg: #2e1818;
    --safety-border: #8a4040;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

header.site .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

header.site a {
  text-decoration: none;
}

header.site .brand {
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  font-size: 1rem;
}

header.site nav a {
  color: var(--text-muted);
  margin-left: 1.25rem;
  font-size: 0.9rem;
}

header.site nav a:hover {
  color: var(--link);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 2.25em 0 0.6em;
  font-weight: 600;
}

h1 {
  font-size: 2rem;
  margin-top: 0.4em;
  font-weight: 700;
}

h2 {
  font-size: 1.35rem;
  padding-top: 0.6em;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1.1rem;
  margin-top: 1.8em;
}

h4 {
  font-size: 1rem;
}

p, ul, ol, table, blockquote {
  margin: 0 0 1em;
}

ul, ol { padding-left: 1.4em; }

li { margin-bottom: 0.4em; }

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

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

strong { font-weight: 600; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.6em 0.8em;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  font-weight: 600;
  background: var(--bg-elevated);
}

.meta {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

.meta p { margin: 0.2em 0; }

.lede {
  font-size: 1.15rem;
  color: var(--text);
  margin-bottom: 1.5em;
}

.callout {
  background: var(--callout-bg);
  border-left: 3px solid var(--callout-border);
  padding: 0.9em 1em;
  border-radius: 4px;
  margin: 1.5em 0;
}

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

.safety {
  background: var(--safety-bg);
  border-left: 3px solid var(--safety-border);
  padding: 0.9em 1em;
  border-radius: 4px;
  margin: 1.5em 0;
}

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

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

footer.site .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

footer.site nav a {
  color: var(--text-muted);
  margin-right: 1rem;
}

footer.site nav a:hover { color: var(--link); }

@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 1.55rem; }
  h2 { font-size: 1.2rem; }
  h3 { font-size: 1.05rem; }
  main { padding: 1.5rem 1.1rem 3rem; }
  th, td { padding: 0.5em 0.55em; }
}