/* The LearnDuo look shared by every page: a plain white reference wiki,
   white in every browser theme on purpose. System fonts only, so no page
   ever calls out to a font host. */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --soft: #f6f7f9;
  --text: #202122;
  --muted: #54595d;
  --line: #dadde3;
  --accent: #2f5bb7;
  --on-accent: #ffffff;
  --err: #b32424;
  --scrim: rgba(20, 22, 26, 0.32);
  --rail: 56px;
  --serif: "Linux Libertine", "Georgia", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--sans);
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
h1 {
  font: 400 32px/1.2 var(--serif);
  margin: 0 0 2px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  text-wrap: balance;
}
h2 {
  font: 400 23px/1.3 var(--serif);
  margin: 26px 0 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line);
  text-wrap: balance;
}
p {
  margin: 0 0 12px;
  max-width: 68ch;
}
[hidden] {
  display: none !important;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
input,
select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 var(--sans);
}
input:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: var(--accent);
}
button {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 var(--sans);
  cursor: pointer;
  white-space: nowrap;
}
button:hover {
  background: var(--soft);
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
}
button.primary:hover {
  filter: brightness(1.08);
}
@media (max-width: 760px) {
  h1 {
    font-size: 27px;
  }
}