:root {
  color-scheme: light dark;
  --bg: #f6f4ef;
  --ink: #1a1b1e;
  --muted: #5c6068;
  --line: #d8d3c8;
  --panel: #fffdf8;
  --accent: #0f4c5c;
  --code-bg: #ece8df;
  --max: 44rem;
  --font: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Segoe UI", system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316;
    --ink: #ecece8;
    --muted: #a8abb3;
    --line: #2c2f36;
    --panel: #1a1c21;
    --accent: #7ec8d8;
    --code-bg: #262930;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.02rem;
  line-height: 1.65;
}

.page {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.header {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.75rem;
}

.brand {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1.15;
  font-weight: 700;
}

h2 {
  margin: 2rem 0 0.75rem;
  font-family: var(--font);
  font-size: 1.35rem;
  line-height: 1.25;
}

.meta {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.lede {
  margin: 0;
  max-width: 40rem;
}

.toc {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.15rem 1.15rem;
  margin-bottom: 0.5rem;
}

.toc h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

.toc ol {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
}

.toc li {
  margin: 0.25rem 0;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

p,
li {
  color: var(--ink);
}

ul,
ol {
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.35rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.footer p {
  margin: 0.35rem 0;
  color: var(--muted);
}

.footer-note {
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .page {
    width: min(var(--max), calc(100% - 1.25rem));
    padding-top: 1.5rem;
  }

  body {
    font-size: 1rem;
  }
}