/* Shared stylesheet for the Simplified Hanzi teaching workspace.
   Tufte-influenced: generous whitespace, restrained color, type does the work. */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;700&family=EB+Garamond:ital,wght@0,400;0,600;1,400&display=swap');

:root {
  --paper: #fbf9f4;
  --ink: #1b1b18;
  --ink-soft: #4a4843;
  --rule: #d8d2c4;
  --accent: #9a3324;
  --accent-soft: #e8d8d2;
  --good: #2f6f4f;
  --good-soft: #dcebe2;
  --bad: #9a3324;
  --bad-soft: #f3ddd8;
  --card: #ffffff;
  --max-width: 720px;
}

* { box-sizing: border-box; }

html { font-size: 19px; }

body {
  margin: 0;
  padding: 0 1.5rem 6rem;
  background: var(--paper);
  color: var(--ink);
  font-family: 'EB Garamond', 'Iowan Old Style', Georgia, serif;
  line-height: 1.55;
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
}

header.lesson-header {
  padding-top: 2.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}

header.lesson-header .kicker {
  font-family: 'EB Garamond', serif;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  margin: 0 0 0.25rem;
}

h1 {
  font-size: 2.1rem;
  font-weight: 600;
  margin: 0 0 1rem;
  line-height: 1.2;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.3rem;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

p { margin: 0 0 1rem; }

a { color: var(--accent); text-decoration: underline; text-decoration-color: var(--accent-soft); }
a:hover { text-decoration-color: var(--accent); }

.hanzi, .han {
  font-family: 'Noto Serif SC', 'Songti SC', 'PingFang SC', 'Microsoft YaHei', serif;
}

/* --- Component / character cards --- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0;
}

.char-card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1rem 0.75rem;
  text-align: center;
}

.char-card .glyph {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
  font-size: 3rem;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.char-card .variant {
  font-size: 1.1rem;
  color: var(--ink-soft);
}

.char-card .pinyin {
  font-style: italic;
  color: var(--accent);
  margin: 0.3rem 0 0.1rem;
}

.char-card .meaning {
  font-size: 0.95rem;
}

.char-card .strokes {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-top: 0.3rem;
}

/* --- Reference tables --- */

table.ref-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

table.ref-table th, table.ref-table td {
  border-bottom: 1px solid var(--rule);
  padding: 0.5rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

table.ref-table th {
  font-weight: 600;
  border-bottom: 2px solid var(--ink);
}

table.ref-table .glyph-cell {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
  font-size: 1.6rem;
  white-space: nowrap;
}

/* --- Breakdown diagram (component -> character) --- */

.breakdown {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  justify-content: center;
  margin: 1.25rem 0;
  flex-wrap: wrap;
}

.breakdown .piece, .breakdown .result {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
  font-size: 2.4rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.3rem 0.6rem;
}

.breakdown .result {
  border-color: var(--accent);
}

.breakdown .op, .breakdown .eq {
  font-size: 1.4rem;
  color: var(--ink-soft);
}

/* --- Stroke order step list --- */

ol.stroke-steps {
  padding-left: 1.4rem;
}
ol.stroke-steps li {
  margin-bottom: 0.4rem;
}
ol.stroke-steps .stroke-glyph {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
  font-size: 1.2rem;
  margin-right: 0.3rem;
}

/* --- Sidenote (Tufte-style margin note, falls back inline on narrow viewports) --- */

.sidenote {
  font-size: 0.85rem;
  color: var(--ink-soft);
  border-left: 2px solid var(--rule);
  padding-left: 0.8rem;
  margin: 1rem 0;
}

/* --- Callouts --- */

.callout {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  padding: 0.9rem 1.1rem;
  margin: 1.25rem 0;
  font-size: 0.97rem;
}

.callout.tip { border-left-color: var(--good); }

/* --- Flashcards (assets/quiz.js) --- */

.flashcard {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  user-select: none;
  margin: 0.75rem 0;
}

.flashcard .front {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
  font-size: 2.6rem;
}

.flashcard .back {
  display: none;
  margin-top: 0.6rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.flashcard.revealed .back { display: block; }

.flashcard .hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-top: 0.5rem;
}

/* --- Multiple choice quiz --- */

.quiz-mc {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.1rem 1.2rem;
  margin: 1.25rem 0;
}

.quiz-mc .quiz-question {
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.quiz-mc .quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.quiz-mc .quiz-options button {
  font-family: inherit;
  font-size: 1rem;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.55rem 0.8rem;
  cursor: pointer;
}

.quiz-mc .quiz-options button:hover { border-color: var(--ink-soft); }

.quiz-mc .quiz-options button.correct {
  background: var(--good-soft);
  border-color: var(--good);
}

.quiz-mc .quiz-options button.incorrect {
  background: var(--bad-soft);
  border-color: var(--bad);
}

.quiz-mc .quiz-options button:disabled { cursor: default; }

.quiz-mc .quiz-feedback {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  min-height: 1.2em;
}

/* --- Nav / footer --- */

nav.lesson-nav, footer.lesson-footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.ask-teacher {
  margin-top: 2.5rem;
  font-style: italic;
  color: var(--ink-soft);
}

@media print {
  body { background: #fff; padding: 0; }
  .quiz-mc, .flashcard, nav.lesson-nav, .ask-teacher { display: none; }
  a { color: var(--ink); text-decoration: none; }
}