:root {
  color-scheme: light dark;
  --bg: #fbf7ef;
  --fg: #2a2520;
  --muted: #655c52;
  --accent: #2f6f4f;
  --accent-fg: #ffffff;
  --card: #ffffff;
  --border: #d9d0c1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181a;
    --fg: #ece6da;
    --muted: #a9a195;
    --accent: #7fcf9f;
    --accent-fg: #10201a;
    --card: #1d2326;
    --border: #38424a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1.125rem/1.65 Georgia, "Times New Roman", serif;
}

main, header, footer {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem;
}

h1 { font-size: 1.8rem; line-height: 1.25; margin: 0.5rem 0; }
h2 { font-size: 1.25rem; margin-top: 2rem; }

a { color: var(--accent); }

.muted { color: var(--muted); font-size: 0.95rem; }

.button, button {
  display: inline-block;
  min-height: 2.75rem;
  padding: 0.6rem 1.1rem;
  border: 2px solid var(--accent);
  border-radius: 0.5rem;
  background: var(--accent);
  color: var(--accent-fg);
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.button.secondary, button.secondary {
  background: transparent;
  color: var(--accent);
}

.button:focus-visible, button:focus-visible, a:focus-visible, #passage-text:focus-visible {
  outline: 3px solid var(--fg);
  outline-offset: 2px;
}

#passage-text {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.5rem 1rem;
}

#choices {
  list-style: none;
  margin: 1rem 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

#choices button.choice {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
  font-weight: 400;
}

#choices button.choice:hover { border-color: var(--accent); }

[hidden] { display: none; }

.note {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
}

ul.facts { padding-left: 1.2rem; }

#license-key {
  width: 100%;
  max-width: 28rem;
  font: inherit;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--card);
  color: inherit;
}

nav ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 1rem; }

@media (min-width: 40rem) {
  body { font-size: 1.2rem; }
  h1 { font-size: 2.2rem; }
}