:root {
  --bg: #f6f8f4;
  --card: #ffffff;
  --text: #1c2420;
  --muted: #55625b;
  --green: #0e5a43;
  --link: #11704f;
  --line: #dfe6e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101512;
    --card: #18201b;
    --text: #e8eee9;
    --muted: #a5b2aa;
    --green: #7fd1ad;
    --link: #8fe0bb;
    --line: #2a352e;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  width: 100%;
  max-width: 560px;
  margin: 48px 16px 24px;
  padding: 32px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
}
.icon { display: block; border-radius: 22px; margin-bottom: 12px; }
h1 { margin: 0 0 4px; font-size: 28px; color: var(--green); }
h2 { margin: 24px 0 8px; font-size: 18px; }
.lead { margin-top: 0; color: var(--muted); }
a { color: var(--link); }
.code {
  font: 600 22px/1.3 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 2px;
  padding: 12px 16px;
  border: 1px dashed var(--line);
  border-radius: 12px;
  text-align: center;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
footer { margin: 8px 16px 32px; color: var(--muted); font-size: 14px; }