:root {
  --blue: #0055ff;
  --ink: #172238;
  --muted: #778398;
  --canvas: #f5f7fb;
  --pale: #eaf0ff;
  --line: #e6ebf3;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 24px 16px 56px; }
.top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 20px; }
.brand { color: var(--blue); font-size: 22px; font-weight: 800; text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 15px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a[aria-current="page"], .nav a:hover { color: var(--blue); }
.card { margin-top: 20px; padding: 28px 22px; background: #fff; border: 1px solid var(--line); border-radius: 20px; }
h1 { margin: 0; font-size: 28px; line-height: 1.2; letter-spacing: -0.01em; }
h2 { margin: 36px 0 8px; font-size: 19px; line-height: 1.3; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
a { color: var(--blue); }
.updated { margin-top: 8px; color: var(--muted); font-size: 15px; }
.lead { margin-top: 20px; font-size: 18px; }
.note { margin-top: 20px; padding: 14px 16px; background: var(--pale); border-radius: 14px; font-size: 15px; }
details { border-top: 1px solid var(--line); padding: 14px 0; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; }
.foot { margin-top: 28px; color: var(--muted); font-size: 14px; text-align: center; }
@media (min-width: 640px) {
  .card { padding: 40px 44px; }
  h1 { font-size: 34px; }
}