/* Tufte-inspired study reference styles */
:root {
  --text: #111;
  --muted: #555;
  --accent: #1a5276;
  --border: #ddd;
  --bg: #faf9f7;
  --card: #fff;
  --correct: #1e6b3a;
  --wrong: #a93226;
}

* { box-sizing: border-box; }

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  font-family: "Palatino Linotype", Palatino, Georgia, serif;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 2rem 1.5rem 4rem;
  max-width: 52rem;
  margin-inline: auto;
}

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--accent);
}

h1 { font-size: 2rem; margin-top: 0; border-bottom: 2px solid var(--accent); padding-bottom: 0.4rem; }
h2 { font-size: 1.35rem; margin-top: 2rem; }
h3 { font-size: 1.1rem; margin-top: 1.5rem; }

p, li { max-width: 42rem; }

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

nav.top {
  font-size: 0.9rem;
  margin-bottom: 2rem;
  padding: 0.75rem 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
}

nav.top a { margin-right: 1rem; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.92rem;
  background: var(--card);
}

th, td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef3f7;
  font-weight: 600;
}

.essay-outline {
  background: var(--card);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.essay-outline ol { margin: 0.5rem 0 0 1.25rem; }

.essay-answer {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--correct);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.essay-answer h3 { margin-top: 0; color: var(--text); }
.essay-answer p { margin: 0.75rem 0; }

.topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 2rem;
}

.topic-nav a {
  padding: 0.35rem 0.75rem;
  background: #eef3f7;
  border-radius: 4px;
  text-decoration: none;
  font-size: 0.85rem;
}

.q-count {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

section.topic-block {
  margin-bottom: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

section.topic-block h2 { scroll-margin-top: 1rem; }

.quiz { margin: 2rem 0; }
.quiz-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.quiz-item label {
  display: block;
  padding: 0.4rem 0;
  cursor: pointer;
}

.quiz-item input { margin-right: 0.5rem; }

.feedback { margin-top: 0.5rem; font-size: 0.9rem; display: none; }
.feedback.show { display: block; }
.feedback.ok { color: var(--correct); }
.feedback.no { color: var(--wrong); }

button, .btn {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.45rem 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 0.5rem;
}

button:hover { opacity: 0.9; }

.reveal-target {
  display: none;
  margin-top: 1rem;
  padding: 1rem;
  background: #f0f6fa;
  border-radius: 4px;
}

.reveal-target.open { display: block; }

.fill-blank input {
  font-family: inherit;
  font-size: 1rem;
  border: none;
  border-bottom: 2px solid var(--accent);
  background: transparent;
  width: 10rem;
  text-align: center;
}

@media print {
  body { background: #fff; padding: 0; font-size: 11pt; }
  nav.top, button, .btn { display: none; }
  .reveal-target { display: block !important; }
}

@media (max-width: 600px) {
  html { font-size: 16px; }
  table { font-size: 0.8rem; }
}

/* ── Markdown / prose pages ── */
.prose { max-width: 52rem; }
.prose > p, .prose li { max-width: none; }
.prose .intro { color: var(--muted); font-size: 0.95rem; }

.prose-list { margin: 0.75rem 0 1.25rem 1.25rem; }
.prose-list li { margin-bottom: 0.35rem; }

.table-wrap { overflow-x: auto; margin: 1.25rem 0; }

code {
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.88em;
  background: #eef3f7;
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.section-divider { border: none; border-top: 2px solid var(--border); margin: 2.5rem 0; }

/* Mid-term question cards */
.exam-set { margin-bottom: 2rem; }
.exam-set > h2 {
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  margin-bottom: 1.25rem;
}

.question-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
  margin-bottom: 1rem;
}

.question-card h3 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.question-text {
  font-size: 1.05rem;
  margin: 0 0 0.85rem;
  font-weight: 500;
}

.mcq-options {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mcq-options li {
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fafbfc;
}

.opt-letter {
  display: inline-block;
  width: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

/* Verified answer cards */
.answer-set { margin-bottom: 2rem; }
.answer-set > h2 {
  background: #1e6b3a;
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  margin-bottom: 1.25rem;
}

.answer-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--correct);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.answer-card h3 { margin: 0 0 0.75rem; color: var(--text); font-size: 1rem; }

.answer-field {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid #f0f0f0;
  font-size: 0.92rem;
}

.answer-field:last-child { border-bottom: none; }

.field-label {
  font-weight: 600;
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.field-correct .field-value { color: var(--correct); font-weight: 600; }
.field-citation .field-value { font-style: italic; color: var(--muted); font-size: 0.88rem; }
.field-screenshot .field-value { color: var(--accent); }