* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #1d1d1f;
  background: #fbfbfd;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header {
  border-bottom: 1px solid #e5e5e7;
  padding-bottom: 16px;
  margin-bottom: 32px;
}

header .brand {
  font-size: 14px;
  font-weight: 600;
  color: #007aff;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

header h1 {
  margin: 8px 0 4px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

header .updated {
  font-size: 13px;
  color: #6e6e73;
}

h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 40px 0 12px;
  letter-spacing: -0.3px;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}

p, li { color: #2c2c2e; }

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

a {
  color: #007aff;
  text-decoration: none;
}

a:hover { text-decoration: underline; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  font-size: 14px;
}

th, td {
  border: 1px solid #e5e5e7;
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f2f2f7;
  font-weight: 600;
}

.callout {
  background: #fff5e6;
  border-left: 4px solid #ff9500;
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 4px;
}

.callout strong { color: #cc6700; }

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid #e5e5e7;
  font-size: 13px;
  color: #6e6e73;
}

footer a { color: #6e6e73; }

nav.toc {
  background: #f2f2f7;
  padding: 16px 22px;
  border-radius: 8px;
  margin-bottom: 32px;
}

nav.toc strong {
  display: block;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #6e6e73;
  margin-bottom: 8px;
}

nav.toc ul {
  margin: 0;
  padding-left: 18px;
  font-size: 14px;
}

nav.toc li { margin-bottom: 4px; }

.home-card {
  display: block;
  background: #fff;
  border: 1px solid #e5e5e7;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 16px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}

.home-card:hover {
  border-color: #007aff;
  text-decoration: none;
  transform: translateY(-1px);
}

.home-card h2 { margin: 0 0 6px; font-size: 18px; }
.home-card p { margin: 0; color: #6e6e73; font-size: 14px; }