:root {
  --bg: #F2F2EE;
  --surface: #FFFFFF;
  --fg: #0C0C0B;
  --dim: #6A6A68;
  --stroke: rgba(0, 0, 0, 0.10);
  --accent: #F54B1A;
  --accent-fg: #FFFFFF;
  --code-bg: #EAEAE4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0C0C0B;
    --surface: #1A1A18;
    --fg: #F2F2EE;
    --dim: #A8A8A4;
    --stroke: rgba(255, 255, 255, 0.12);
    --code-bg: #2A2A26;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  border-bottom: 1px solid var(--stroke);
  padding: 18px 24px;
  background: var(--surface);
}

header.site .inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

header.site a.brand {
  color: var(--fg);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 17px;
}

header.site nav a {
  color: var(--dim);
  text-decoration: none;
  margin-left: 20px;
  font-size: 15px;
}

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

h1 {
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 4px;
}

h2 {
  font-size: 20px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

h3 {
  font-size: 17px;
  margin: 28px 0 8px;
}

p { margin: 12px 0; }

.meta {
  color: var(--dim);
  font-size: 14px;
  margin-bottom: 24px;
}

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

ul, ol { padding-left: 22px; }
li { margin: 6px 0; }

hr {
  border: 0;
  border-top: 1px solid var(--stroke);
  margin: 40px 0;
}

code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
}

.note {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 24px 0;
  color: var(--dim);
  font-size: 15px;
}

footer.site {
  border-top: 1px solid var(--stroke);
  padding: 24px;
  color: var(--dim);
  font-size: 14px;
  text-align: center;
}

footer.site a { color: var(--dim); margin: 0 10px; }