:root {
  color-scheme: light dark;
  --bg: #f5f1e8;
  --card: #fffdf8;
  --text: #22201d;
  --muted: #706a62;
  --border: #d9d1c5;
  --button: #24211d;
  --button-text: #fffdf8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171614;
    --card: #211f1c;
    --text: #f4efe6;
    --muted: #aaa298;
    --border: #3d3933;
    --button: #f4efe6;
    --button-text: #171614;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app {
  width: min(100%, 620px);
  text-align: center;
}

.eyebrow, .label {
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--muted);
}

h1 {
  margin: 8px 0 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.2rem, 8vw, 4rem);
  line-height: .98;
}

.intro {
  margin: 0 auto 28px;
  color: var(--muted);
}

.result {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: clamp(28px, 7vw, 48px);
}

.book {
  margin-top: 10px;
  min-height: 2.5em;
  display: grid;
  place-items: center;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.6rem, 6vw, 2.8rem);
  font-weight: 700;
  line-height: 1.1;
}

.divider {
  width: 56px;
  height: 1px;
  margin: 28px auto;
  background: var(--border);
}

.page {
  margin-top: 2px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(4rem, 18vw, 7rem);
  font-weight: 700;
  line-height: 1;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}

button {
  min-height: 50px;
  border: 1px solid var(--button);
  border-radius: 12px;
  padding: 12px 16px;
  background: var(--button);
  color: var(--button-text);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

button:disabled {
  opacity: .45;
  cursor: not-allowed;
}

button:not(:disabled):active {
  transform: translateY(1px);
}

button:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 3px;
}

.status {
  min-height: 1.5em;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: .9rem;
}

.status.error { color: #b43a32; }

@media (max-width: 480px) {
  .actions { grid-template-columns: 1fr; }
}