:root {
  --ground: #F4F4EF; --surface: #FFFFFF; --text: #15171C; --muted: #555A64; --line: #E1E1D8;
  --ink: #2E44D1; --on-ink: #FFFFFF; --fill: #ECECE5;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0F1116; --surface: #191C23; --text: #ECEDEF; --muted: #A3A8B3; --line: #2C313C;
    --ink: #8E9CFF; --on-ink: #0F1116; --fill: #232730;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--ground); color: var(--text);
  font: 16px/1.5 "Onest", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 640px; margin: 0 auto; padding: 32px 16px 48px; display: flex; flex-direction: column; gap: 16px; }
h1 { margin: 0; font: 600 28px/1.2 "Unbounded", system-ui, sans-serif; }
h2 { margin: 16px 0 0; font-size: 18px; font-weight: 600; scroll-margin-top: 16px; }
p, ul { margin: 0; }
ul { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
a { color: var(--ink); }
.lead { font-size: 18px; color: var(--muted); }
.muted { font-size: 14px; color: var(--muted); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.code { font: 600 32px/1.1 "Unbounded", system-ui, sans-serif; letter-spacing: 2px; font-variant-numeric: tabular-nums; }
.button {
  display: flex; align-items: center; justify-content: center; min-height: 56px; border-radius: 16px;
  background: var(--ink); color: var(--on-ink); font-size: 17px; font-weight: 700; text-decoration: none;
}
footer { display: flex; flex-wrap: wrap; gap: 16px; font-size: 14px; }
[hidden] { display: none !important; }