:root {
  color-scheme: light dark;
  --background: #ffffff;
  --surface: #f5f5f7;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --border: rgba(0, 0, 0, 0.08);
  --link: #0066cc;
  --code: #e8e8ed;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

main {
  width: min(100% - 40px, 760px);
  margin: 0 auto;
  padding: 32px 0 56px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 48px;
}

nav a {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 13px;
  color: var(--secondary);
  font-size: 14px;
  text-decoration: none;
}

nav a.current {
  background: var(--text);
  color: var(--background);
}

h1 {
  margin: 0 0 6px;
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.03em;
}

h2 {
  margin: 38px 0 10px;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

h3 {
  margin: 24px 0 6px;
  font-size: 17px;
  line-height: 1.45;
}

p {
  margin: 10px 0;
}

ul {
  margin: 10px 0;
  padding-left: 1.35em;
}

li + li {
  margin-top: 8px;
}

a {
  color: var(--link);
  text-underline-offset: 0.15em;
}

.updated,
.note {
  color: var(--secondary);
  font-size: 14px;
}

.updated {
  margin-bottom: 32px;
}

.summary,
.card {
  margin: 28px 0;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  padding: 20px 22px;
}

.summary p,
.card p:last-child {
  margin-bottom: 0;
}

.card h2 {
  margin-top: 0;
}

code {
  border-radius: 6px;
  background: var(--code);
  padding: 2px 6px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 56px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
  color: var(--secondary);
  font-size: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #111113;
    --surface: #1c1c1e;
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --border: rgba(255, 255, 255, 0.12);
    --link: #64a8ff;
    --code: #2c2c2e;
  }
}

@media (max-width: 480px) {
  main {
    width: min(100% - 32px, 760px);
    padding-top: 24px;
  }

  nav {
    margin-bottom: 36px;
  }

  .summary,
  .card {
    border-radius: 16px;
    padding: 18px;
  }
}