:root {
  --ink: #1f2024;
  --ink-soft: #4a4d54;
  --muted: #80838b;
  --paper: #fbf8f1;
  --line: #e6e2d8;
  --accent: #4a90d9;
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 -apple-system, "SF Pro Text", "PingFang SC", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 28px 96px;
}

header.top {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}

header.top a.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

header.top .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

header.top .title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.2px;
}

header.top nav {
  margin-left: auto;
  display: flex;
  gap: 18px;
}

header.top nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

header.top nav a:hover, header.top nav a.active {
  color: var(--ink);
}

h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.6px;
  margin: 0 0 8px;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.2px;
  margin: 36px 0 10px;
  color: var(--ink);
}

p, ul, ol {
  color: var(--ink-soft);
  margin: 10px 0;
}

ul, ol { padding-left: 22px; }

li { margin: 4px 0; }

.lede {
  font-size: 15px;
  color: var(--muted);
  margin: 0 0 32px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font: 13px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  background: rgba(0,0,0,0.04);
  padding: 1px 5px;
  border-radius: 3px;
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ebe8e0;
    --ink-soft: #c8c5be;
    --muted: #8b8780;
    --paper: #1a1a1c;
    --line: #2e2e30;
  }
  code { background: rgba(255,255,255,0.06); }
}