:root {
  color-scheme: light;
  --ink: #18232d;
  --muted: #606a74;
  --paper: #f6f1e7;
  --surface: #fffdf8;
  --line: #d7ccba;
  --blue: #1f3b4d;
  --teal: #24756f;
  --gold: #f0b84a;
  --red: #ad5649;
  --green: #506f44;
  --shadow: 0 18px 48px rgba(31, 59, 77, 0.14);
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(135deg, rgba(240, 184, 74, 0.2), transparent 34rem),
    linear-gradient(180deg, #fbf7ee 0%, #eee4d4 100%);
  color: var(--ink);
}

button {
  font: inherit;
  cursor: pointer;
}

.app-shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 30px 0 42px;
}

.hero {
  max-width: 850px;
  margin-bottom: 22px;
}

.eyebrow,
.kicker {
  margin: 0 0 9px;
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 920px;
  margin-bottom: 14px;
  font-size: clamp(2.15rem, 5.5vw, 4.9rem);
  line-height: 0.99;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.12rem;
  line-height: 1.62;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.learning-surface,
.quiz-panel,
.party-panel,
.ai-panel,
.origin-panel,
.closing {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 248, 0.94);
  box-shadow: var(--shadow);
}

.learning-surface {
  overflow: hidden;
}

.lesson-nav {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-bottom: 1px solid var(--line);
  background: #fbf4e6;
}

.lesson-tab {
  min-height: 58px;
  border: 0;
  border-right: 1px solid var(--line);
  padding: 10px 12px;
  background: transparent;
  color: var(--ink);
  font-weight: 800;
  text-align: left;
  overflow-wrap: anywhere;
}

.lesson-tab:last-child {
  border-right: 0;
}

.lesson-tab.is-active {
  background: var(--blue);
  color: white;
}

.lesson-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 24px;
  padding: 24px;
}

.lesson-copy h2,
.quiz-panel h2,
.party-panel h2,
.ai-panel h2,
.origin-panel h2,
.closing h2 {
  margin-bottom: 12px;
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.lesson-copy p,
.section-intro p,
.ai-panel p,
.origin-copy p,
.closing p,
#quizQuestion {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.65;
}

.plain-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.plain-list li {
  border-left: 5px solid var(--gold);
  border-radius: 8px;
  padding: 11px 13px;
  background: #f8f1e2;
  line-height: 1.45;
}

.controls {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.primary,
.secondary {
  min-height: 44px;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 850;
}

.primary {
  border: 1px solid var(--blue);
  background: var(--blue);
  color: white;
}

.secondary {
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
}

.primary:disabled,
.secondary:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.lesson-board {
  min-height: 420px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #f7f1e6;
}

.vote-stack {
  display: grid;
  gap: 12px;
}

.vote-slip,
.idea-card,
.decision-card,
.balance-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: white;
}

.vote-slip {
  border-left: 8px solid var(--teal);
}

.vote-slip:nth-child(2) {
  border-left-color: var(--red);
}

.vote-slip:nth-child(3) {
  border-left-color: var(--blue);
}

.vote-slip h3,
.idea-card h3,
.decision-card h3 {
  margin-bottom: 5px;
  font-size: 1.05rem;
}

.vote-slip p,
.idea-card p,
.decision-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.45;
}

.idea-grid,
.decision-grid,
.balance-list {
  display: grid;
  gap: 10px;
}

.balance-item strong {
  display: block;
  margin-bottom: 4px;
}

.balance-item span {
  color: var(--muted);
  line-height: 1.42;
}

.idea-card:nth-child(1) {
  border-top: 6px solid #8b4e9f;
}

.idea-card:nth-child(2) {
  border-top: 6px solid var(--teal);
}

.idea-card:nth-child(3) {
  border-top: 6px solid var(--green);
}

.idea-card:nth-child(4) {
  border-top: 6px solid var(--gold);
}

.question-row {
  display: grid;
  gap: 10px;
}

.question-chip {
  border-radius: 999px;
  padding: 9px 12px;
  background: white;
  border: 1px solid var(--line);
  font-weight: 800;
}

.quiz-panel,
.ai-panel,
.origin-panel {
  display: grid;
  grid-template-columns: minmax(250px, 0.8fr) 1fr;
  gap: 20px;
  margin-top: 18px;
  padding: 22px;
}

a {
  color: var(--blue);
  font-weight: 800;
  text-underline-offset: 3px;
  overflow-wrap: anywhere;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(240, 184, 74, 0.95);
  outline-offset: 3px;
}

.origin-copy p:last-child {
  margin-bottom: 0;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  align-content: start;
}

.quiz-option {
  min-height: 56px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: var(--ink);
  font-weight: 850;
}

.quiz-option.is-correct {
  border-color: var(--teal);
  background: #e8f5f1;
}

.quiz-option.is-wrong {
  border-color: var(--red);
  background: #faece8;
}

.feedback {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.closing {
  margin-top: 18px;
  padding: 24px;
}

.party-panel {
  margin-top: 18px;
  padding: 22px;
}

.section-intro {
  max-width: 820px;
  margin-bottom: 16px;
}

.party-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.party-card {
  display: grid;
  gap: 8px;
  align-content: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: white;
}

.party-card h3 {
  margin-bottom: 0;
  font-size: 1.05rem;
}

.party-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.48;
}

.party-abbr {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--blue);
  color: white;
  font-weight: 900;
}

.rule-list {
  display: grid;
  gap: 10px;
}

.rule-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  background: white;
}

.rule-card strong {
  display: block;
  margin-bottom: 4px;
}

.rule-card span {
  color: var(--muted);
  line-height: 1.42;
}

.closing p {
  max-width: 790px;
  margin-bottom: 0;
}

.source-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

@media (max-width: 920px) {
  .lesson-card,
  .quiz-panel,
  .ai-panel,
  .origin-panel {
    grid-template-columns: 1fr;
  }

  .feedback {
    grid-column: auto;
  }

  .lesson-board {
    min-height: 0;
  }

  .party-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .app-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 18px;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }

  .lesson-nav {
    grid-template-columns: repeat(6, minmax(142px, 1fr));
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x proximity;
  }

  .lesson-tab {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    scroll-snap-align: start;
  }

  .lesson-card,
  .quiz-panel,
  .party-panel,
  .ai-panel,
  .origin-panel,
  .closing {
    padding: 16px;
  }

  .controls {
    flex-direction: column;
  }

  .party-grid {
    grid-template-columns: 1fr;
  }
}

@media print {
  @page {
    margin: 22mm 24mm 20mm;
  }

  body {
    background: white;
  }

  .app-shell {
    width: min(170mm, 100%);
    margin: 0 auto;
    padding: 8mm 0 0;
  }

  .hero {
    max-width: none;
    margin-bottom: 14mm;
  }

  .hero-actions,
  .lesson-nav,
  .controls,
  .quiz-panel {
    display: none;
  }

  .learning-surface,
  .party-panel,
  .ai-panel,
  .origin-panel,
  .closing {
    box-shadow: none;
    border: 0;
    break-inside: avoid;
  }

  .lesson-card {
    grid-template-columns: 1fr;
  }
}