:root {
  --smu-blue: #003d7c;
  --smu-red: #c41230;
  --smu-gold: #b38b00;
  --ink: #172033;
  --muted: #5b6678;
  --line: #d8dee8;
  --paper: #ffffff;
  --page: #eef2f6;
  --soft-blue: #e8f0f8;
  --soft-red: #fff0f2;
  --soft-gold: #fff7de;
  --green: #177245;
  --radius: 8px;
  --shadow: 0 16px 38px rgba(20, 42, 76, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "Aptos", "Segoe UI", Arial, sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 28px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 58px;
  height: 34px;
  background: var(--smu-blue);
  color: #fff;
  border-bottom: 4px solid var(--smu-red);
  font-weight: 850;
  letter-spacing: 0.06em;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  color: var(--smu-blue);
  font-size: 18px;
}

.brand small {
  color: var(--muted);
  font-size: 13px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 10px 13px;
  border-radius: 6px;
  color: var(--muted);
  font-weight: 800;
  text-decoration: none;
}

.site-nav a.active,
.site-nav a:hover {
  background: var(--soft-blue);
  color: var(--smu-blue);
}

#app {
  min-height: calc(100vh - 126px);
}

.page-band {
  padding: 42px 28px;
}

.page-band.white {
  background: var(--paper);
}

.inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 34px;
  align-items: stretch;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.kicker {
  margin: 0 0 10px;
  color: var(--smu-red);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

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

h1 {
  max-width: 830px;
  margin-bottom: 16px;
  color: var(--smu-blue);
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.02;
  font-weight: 850;
}

h2 {
  margin-bottom: 18px;
  color: var(--smu-blue);
  font-size: clamp(28px, 3.3vw, 42px);
  line-height: 1.12;
}

h3 {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 21px;
}

p,
li {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.48;
}

.lede {
  max-width: 760px;
  color: var(--muted);
  font-size: 21px;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 15px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--smu-blue);
  color: #fff;
  font-weight: 850;
  text-decoration: none;
  cursor: pointer;
}

.button.secondary {
  background: #fff;
  border-color: var(--line);
  color: var(--smu-blue);
}

.button.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.button:hover {
  background: var(--smu-red);
  color: #fff;
}

.hero-panel,
.week-card,
.concept-card,
.quiz-shell,
.material-card,
.stat-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.hero-panel {
  display: grid;
  gap: 14px;
  padding: 22px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-card {
  box-shadow: none;
  padding: 16px;
}

.stat-card strong {
  display: block;
  color: var(--smu-blue);
  font-size: 30px;
  line-height: 1;
}

.stat-card span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.preview-media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.preview-media img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.section-heading p {
  max-width: 680px;
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.week-grid {
  display: grid;
  gap: 18px;
}

.week-card {
  overflow: hidden;
}

.week-card-main {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: 22px;
  padding: 22px;
}

.week-meta {
  border-right: 1px solid var(--line);
  padding-right: 22px;
}

.week-meta h3 {
  color: var(--smu-blue);
  font-size: 28px;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--soft-blue);
  color: var(--smu-blue);
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
}

.badge.red {
  background: var(--soft-red);
  color: var(--smu-red);
}

.badge.gold {
  background: var(--soft-gold);
  color: #715a00;
}

.objective-list {
  margin: 0;
  padding-left: 20px;
}

.objective-list li {
  font-size: 16px;
}

.material-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.material-card {
  box-shadow: none;
  padding: 15px;
  text-decoration: none;
}

.material-card:hover {
  border-color: var(--smu-red);
}

.material-card strong {
  display: block;
  color: var(--ink);
  font-size: 17px;
}

.material-card span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.toolbar {
  display: grid;
  grid-template-columns: 1fr 190px 190px;
  gap: 12px;
  margin-bottom: 18px;
}

.toolbar input,
.toolbar select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.concept-card {
  box-shadow: none;
  padding: 18px;
  border-top: 6px solid var(--smu-blue);
}

.concept-card h3 {
  color: var(--smu-blue);
}

.concept-card .group {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--smu-red);
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
}

.concept-card p {
  font-size: 16px;
}

.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.link-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 9px;
  color: var(--smu-blue);
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: #fff;
  color: var(--muted);
  text-align: center;
}

.quiz-shell {
  box-shadow: none;
  overflow: hidden;
}

.quiz-topbar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  padding: 18px 20px;
  background: var(--smu-blue);
  color: #fff;
}

.quiz-topbar h3,
.quiz-topbar p {
  margin: 0;
  color: #fff;
}

.quiz-mode {
  display: flex;
  gap: 8px;
}

.quiz-mode button {
  min-height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 6px;
  background: transparent;
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

.quiz-mode button.active {
  background: #fff;
  color: var(--smu-blue);
}

.quiz-body {
  padding: 22px;
}

.question-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: #fff;
}

.quiz-selector {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.quiz-selector p {
  max-width: 520px;
  text-align: right;
}

.quiz-selector select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 8px 12px;
  font-weight: 800;
}

.question-card + .question-card {
  margin-top: 14px;
}

.question-prompt {
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
}

.choice-list {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}

.choice-button,
.choice-row {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: center;
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 9px 12px;
  text-align: left;
  cursor: pointer;
}

.choice-button:hover,
.choice-button.selected {
  border-color: var(--smu-blue);
  background: var(--soft-blue);
}

.choice-marker {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--smu-blue);
  color: #fff;
  font-size: 13px;
  font-weight: 850;
}

.choice-row.correct {
  border-color: var(--green);
  background: #eef8f2;
}

.choice-row.incorrect {
  border-color: var(--smu-red);
  background: var(--soft-red);
}

.feedback {
  display: none;
  margin-top: 14px;
  border-left: 5px solid var(--smu-blue);
  background: var(--soft-blue);
  padding: 13px 15px;
}

.feedback.visible {
  display: block;
}

.feedback.correct {
  border-left-color: var(--green);
  background: #eef8f2;
}

.feedback.incorrect {
  border-left-color: var(--smu-red);
  background: var(--soft-red);
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.score-panel {
  display: none;
  margin-top: 18px;
  padding: 18px;
  border-radius: var(--radius);
  background: var(--soft-gold);
  border-left: 6px solid var(--smu-gold);
}

.score-panel.visible {
  display: block;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 28px;
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 980px) {
  .hero-grid,
  .week-card-main,
  .toolbar,
  .quiz-selector,
  .llm-layout {
    grid-template-columns: 1fr;
  }

  .quiz-selector {
    justify-items: start;
  }

  .quiz-selector p {
    text-align: left;
  }

  .week-meta {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding-right: 0;
    padding-bottom: 18px;
  }

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

@media (max-width: 680px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
  }

  .site-nav a {
    flex: 1;
    text-align: center;
  }

  .page-band {
    padding: 30px 16px;
  }

  .stat-grid,
  .card-grid,
  .material-grid,
  .concept-grid,
  .quiz-topbar {
    grid-template-columns: 1fr;
  }

  .quiz-topbar {
    display: grid;
  }
}