:root {
  --bg: #f6f1e8;
  --paper: #fffdf8;
  --ink: #1f1f1c;
  --muted: #5a564f;
  --line: #d9cfbf;
  --accent: #6b4f2a;
  --accent-soft: #efe3cf;
  --good: #215732;
  --bad: #7a2f2f;
  --shadow: 0 10px 30px rgba(39, 28, 16, 0.08);
}

* { box-sizing: border-box; }
html { font-size: 18px; }
body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f2ebdf 0%, var(--bg) 100%);
  line-height: 1.65;
}

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

a:hover { text-decoration-thickness: 2px; }

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

.lesson {
  max-width: 780px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 0.7rem;
}

h1 { font-size: clamp(2rem, 4vw, 3.4rem); }
h2 { font-size: 1.45rem; margin-top: 2.3rem; }
h3 { font-size: 1.08rem; margin-top: 1.5rem; }

p, li { max-width: 70ch; }

.lede {
  font-size: 1.12rem;
  color: #312d28;
}

.card, .callout, .quiz, .worked-example, .practice, .reference-block {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.1rem 1.15rem;
  box-shadow: var(--shadow);
}

.card + .card,
.callout + .callout,
.reference-block + .reference-block,
.quiz + .quiz {
  margin-top: 1rem;
}

.callout {
  border-left: 6px solid var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95em;
  background: #f4ede1;
  border: 1px solid #e2d4bc;
  border-radius: 8px;
  padding: 0.08rem 0.35rem;
}

.math {
  font-style: italic;
  white-space: nowrap;
}

.steps {
  padding-left: 1.2rem;
}

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

.quiz label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.45rem;
}

.quiz input {
  width: min(260px, 100%);
  font: inherit;
  padding: 0.6rem 0.7rem;
  border-radius: 10px;
  border: 1px solid #b9aa91;
  background: #fffefa;
}

.quiz button {
  margin-top: 0.7rem;
  font: inherit;
  border: 0;
  border-radius: 999px;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
}

.feedback {
  min-height: 1.4rem;
  margin-top: 0.6rem;
  font-weight: 600;
}

.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

@media print {
  body {
    background: white;
    font-size: 12pt;
  }

  .page { padding: 0; }
  .card, .callout, .quiz, .worked-example, .practice, .reference-block {
    box-shadow: none;
    border-radius: 0;
  }
}