:root {
  --page: #ffffff;
  --fill: #f3f5f8;
  --ink: #0e1726;
  --ink2: #4a5568;
  --stroke: #dde1e8;
  --brand: #1d63db;
  --on-brand: #ffffff;
  --brand-soft: #e6eefc;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --page: #0b1220;
    --fill: #1a2438;
    --ink: #e8edf4;
    --ink2: #9aa6b8;
    --stroke: #25314a;
    --brand: #7fa8ff;
    --on-brand: #0b1220;
    --brand-soft: #16264a;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: var(--page);
  color: var(--ink);
  font: 400 17px/1.6 "Geist", system-ui, -apple-system, sans-serif;
}
a { color: var(--brand); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 640px; margin: 0 auto; padding: 0 24px; }

header.site { padding: 24px 0; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 19px; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }

main { flex: 1; padding: 32px 0 80px; }
h1 { font-size: 36px; line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; margin: 0 0 8px; }
h2 { font-size: 21px; line-height: 1.3; font-weight: 600; margin: 48px 0 8px; }
p, ul { margin: 0 0 16px; }
ul { padding-left: 22px; }
li { margin-bottom: 8px; }
.updated { color: var(--ink2); font-size: 15px; margin-bottom: 24px; }
.summary { font-size: 19px; color: var(--ink); background: var(--fill); border-radius: 16px; padding: 20px 24px; margin: 0; }
.toc { display: flex; flex-wrap: wrap; gap: 0 20px; font-size: 15px; margin: 12px 0 8px; }
h2[id] { scroll-margin-top: 16px; }
.toc a { display: inline-block; padding: 10px 0; }
.defs strong { display: block; margin-bottom: 2px; }
.defs li { margin-bottom: 14px; }
.note { border-left: 3px solid var(--ink2); padding: 4px 0 4px 16px; }

.hero { display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 48px 24px; }
.hero img { width: 128px; height: 128px; border-radius: 29px; box-shadow: 0 12px 32px rgba(14, 23, 38, 0.18); }
.hero h1 { font-size: 32px; margin: 32px 0 12px; }
.hero p { font-size: 20px; color: var(--ink2); max-width: 32ch; text-wrap: balance; margin: 0 auto 32px; }
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 24px;
  border-radius: 999px; background: var(--brand); color: var(--on-brand); font-weight: 600; text-decoration: none;
}
.button[aria-disabled="true"] { background: transparent; color: var(--ink2); border: 1px solid var(--stroke); font-weight: 500; cursor: default; }

footer.site { border-top: 1px solid var(--stroke); padding: 24px 0 48px; color: var(--ink2); font-size: 15px; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 0 24px; margin-bottom: 4px; }
footer.site a { color: var(--ink2); }
footer.site nav a { display: inline-block; padding: 10px 0; }

@media (max-width: 480px) {
  h1 { font-size: 30px; }
  .hero h1 { font-size: 28px; }
  .summary { padding: 16px 20px; font-size: 17px; }
}