:root {
  --bg: #f7f5f1;
  --card: #ffffff;
  --text: #1f2a2e;
  --muted: #5b676b;
  --brand: #2f6f62;
  --ok: #2f6f62;
  --err: #a33a2c;
  --line: #e4e0d8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a1c;
    --card: #1d2528;
    --text: #eef2f1;
    --muted: #a7b3b0;
    --brand: #7cc4b3;
    --ok: #7cc4b3;
    --err: #f0a092;
    --line: #2c3639;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 18px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
}
main {
  width: 100%;
  max-width: 520px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 24px;
}
.brand { color: var(--brand); font-weight: 700; font-size: 22px; margin: 0 0 24px; }
h1 { font-size: 26px; line-height: 1.3; margin: 0 0 12px; }
p { margin: 0 0 16px; color: var(--muted); }
.ok h1 { color: var(--ok); }
.err h1 { color: var(--err); }
.button {
  display: inline-block;
  margin-top: 8px;
  padding: 14px 20px;
  border-radius: 12px;
  background: var(--brand);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
}
.hidden { display: none; }
footer { margin-top: 24px; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); }
button.button { border: 0; font: inherit; cursor: pointer; }
.button + .button { margin-left: 8px; }
main.doc { max-width: 720px; }
main.doc h2 { font-size: 20px; margin: 24px 0 8px; }
main.doc ol, main.doc ul { color: var(--muted); padding-left: 22px; margin: 0 0 16px; }
main.doc li { margin-bottom: 8px; }
main.doc a { color: var(--brand); }