:root {
  color-scheme: light dark;
  --bg: #f7f8fc;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #5b6270;
  --accent: #3b5bdb;
  --on-accent: #ffffff;
  --border: #dfe3ec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101218;
    --surface: #191c24;
    --text: #eceef4;
    --muted: #9aa2b3;
    --accent: #8ea2ff;
    --on-accent: #10142b;
    --border: #2a2f3b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 3rem;
  text-align: center;
}
main.doc { text-align: left; max-width: 44rem; }
.logo { border-radius: 22px; }
h1 { font-size: 2rem; margin: 1rem 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .4rem; }
.lead { font-size: 1.1rem; color: var(--muted); margin: 0 0 1.75rem; }
.button {
  display: inline-block;
  padding: .85rem 1.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  text-decoration: none;
}
.button.secondary { background: transparent; color: var(--accent); border: 1.5px solid var(--accent); }
.hint { color: var(--muted); font-size: .9rem; margin: .8rem 0 1.4rem; }
.features { list-style: none; padding: 0; margin: 2rem 0; text-align: left; }
.features li { padding: .7rem 1rem; margin: .5rem 0; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 1rem 1.25rem; margin: 1.5rem 0; }
.card div { display: flex; justify-content: space-between; align-items: baseline; padding: .35rem 0; }
.card strong { font: 600 1.5rem ui-monospace, Consolas, monospace; letter-spacing: .05em; }
.foot { margin-top: 2.5rem; font-size: .9rem; }
a { color: var(--accent); }
ul.plain { padding-left: 1.2rem; }
[hidden] { display: none !important; }