:root {
  --ink: #243746;
  --muted: #60727f;
  --paper: #f6f8f9;
  --panel: #ffffff;
  --line: #d9e2e8;
  --accent: #c1452d;
  --accent-dark: #8e2f20;
  --good: #207a4a;
  --focus: #266db5;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 22px clamp(18px, 4vw, 48px);
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
}

h2 {
  font-size: clamp(1.2rem, 2vw, 1.7rem);
}

.eyebrow {
  margin-bottom: 2px;
  color: var(--accent-dark);
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.scorebox {
  min-width: 110px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: #fdfefe;
  text-align: center;
}

.scorebox span,
.scorebox strong {
  display: block;
}

.scorebox span {
  color: var(--muted);
  font-size: 0.86rem;
}

.scorebox strong {
  font-size: 1.35rem;
}

main {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  gap: 32px;
  align-items: center;
  min-height: calc(100vh - 92px);
  padding: 34px 0;
}

.hero-copy p {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.08rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button,
.complete,
.tab {
  min-height: 42px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  padding: 9px 14px;
  cursor: pointer;
  text-decoration: none;
  border-radius: 6px;
}

.button:hover,
.complete:hover,
.tab:hover,
.button:focus-visible,
.complete:focus-visible,
.tab:focus-visible,
select:focus-visible,
textarea:focus-visible,
.flip-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent);
  outline-offset: 2px;
}

.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.blueprint {
  background: #ffffff;
  border: 1px solid var(--line);
  box-shadow: 0 18px 42px rgba(36, 55, 70, 0.12);
  aspect-ratio: 46 / 30;
}

.blueprint svg {
  display: block;
  width: 100%;
  height: 100%;
}

.teacher-note,
.quiz,
.assignment {
  padding: 28px;
  margin-bottom: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.module-nav {
  display: grid;
  align-content: start;
  gap: 8px;
  position: sticky;
  top: 112px;
}

.tab {
  text-align: left;
}

.tab.active {
  border-color: var(--accent);
  color: var(--accent-dark);
  background: #fff6f3;
}

.module {
  display: none;
  min-height: 360px;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.module.active {
  display: block;
}

.callout {
  margin: 20px 0;
  padding: 16px;
  border-left: 5px solid var(--accent);
  background: #fff8f5;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.flip-card {
  min-height: 132px;
  border: 1px solid var(--line);
  background: #fdfefe;
  padding: 18px;
  text-align: left;
  cursor: pointer;
  border-radius: 8px;
  font: inherit;
}

.flip-card .front {
  display: block;
  font-weight: 800;
  font-size: 1.08rem;
}

.flip-card .back {
  display: none;
  margin-top: 10px;
  color: var(--muted);
}

.flip-card.open {
  border-color: var(--focus);
}

.flip-card.open .back {
  display: block;
}

.matching,
.checklist,
.quiz-list {
  display: grid;
  gap: 14px;
}

.matching label,
.checklist label,
.question {
  display: grid;
  gap: 8px;
  padding: 14px;
  background: #f9fbfc;
  border: 1px solid var(--line);
}

select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  border-radius: 6px;
}

select {
  min-height: 42px;
  padding: 8px 10px;
}

textarea {
  resize: vertical;
  min-height: 140px;
  padding: 12px;
}

.question fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.question legend {
  font-weight: 800;
  margin-bottom: 8px;
}

.feedback {
  min-height: 28px;
  margin: 14px 0 0;
  font-weight: 700;
}

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

.feedback.warn {
  color: var(--accent-dark);
}

.save-state {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

footer {
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 820px) {
  .topbar,
  .hero {
    display: block;
  }

  .scorebox {
    margin-top: 14px;
    width: fit-content;
  }

  .hero {
    min-height: auto;
  }

  .blueprint {
    margin-top: 24px;
  }

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

  .module-nav {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 520px) {
  main {
    width: min(100% - 20px, 1160px);
  }

  .module-nav {
    grid-template-columns: 1fr;
  }

  .teacher-note,
  .module,
  .quiz,
  .assignment {
    padding: 18px;
  }
}