:root {
  color-scheme: dark;
  --ink: #f5f9ff;
  --muted: #b6c4d4;
  --line: rgba(190, 233, 255, 0.32);
  --paper: #f7fafb;
  --panel: rgba(23, 48, 92, 0.66);
  --accent: #73e4ff;
  --accent-dark: #d8f7ff;
  --accent-soft: rgba(115, 228, 255, 0.16);
  --gold: #f4be5d;
  --gold-bright: #ffe4a9;
  --gold-soft: rgba(244, 190, 93, 0.18);
  --pink: #ff9bd5;
  --pink-soft: rgba(255, 155, 213, 0.18);
  --shadow: 0 22px 58px rgba(4, 15, 48, 0.26);
  --glass: rgba(28, 56, 104, 0.62);
  --glass-strong: rgba(30, 58, 108, 0.78);
  --glass-button: rgba(255, 255, 255, 0.12);
  --glass-button-hover: var(--accent-soft);
  --glass-button-selected: linear-gradient(135deg, rgba(115, 228, 255, 0.14), rgba(244, 190, 93, 0.2), rgba(255, 155, 213, 0.13));
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 12%, rgba(92, 211, 255, 0.3), transparent 25rem),
    radial-gradient(circle at 78% 4%, rgba(255, 202, 112, 0.17), transparent 20rem),
    radial-gradient(circle at 58% 78%, rgba(118, 135, 255, 0.2), transparent 24rem),
    radial-gradient(circle at 86% 72%, rgba(255, 155, 213, 0.16), transparent 22rem),
    linear-gradient(180deg, #102a57 0%, #17215f 48%, #0a1640 100%);
  color: #f7fbff;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 7% 18%, rgba(255, 255, 255, 0.78) 0 1px, transparent 1.8px),
    radial-gradient(circle at 14% 72%, rgba(144, 220, 235, 0.56) 0 1.2px, transparent 2px),
    radial-gradient(circle at 23% 36%, rgba(255, 220, 156, 0.5) 0 1px, transparent 1.8px),
    radial-gradient(circle at 31% 86%, rgba(255, 255, 255, 0.62) 0 1px, transparent 1.8px),
    radial-gradient(circle at 42% 21%, rgba(144, 220, 235, 0.5) 0 1.4px, transparent 2.2px),
    radial-gradient(circle at 49% 64%, rgba(255, 255, 255, 0.68) 0 1px, transparent 1.8px),
    radial-gradient(circle at 57% 11%, rgba(255, 220, 156, 0.44) 0 1px, transparent 1.8px),
    radial-gradient(circle at 64% 78%, rgba(144, 220, 235, 0.56) 0 1.2px, transparent 2px),
    radial-gradient(circle at 72% 42%, rgba(255, 255, 255, 0.7) 0 1px, transparent 1.8px),
    radial-gradient(circle at 81% 16%, rgba(144, 220, 235, 0.48) 0 1.3px, transparent 2px),
    radial-gradient(circle at 88% 69%, rgba(255, 220, 156, 0.46) 0 1px, transparent 1.8px),
    radial-gradient(circle at 94% 34%, rgba(255, 255, 255, 0.58) 0 1px, transparent 1.8px),
    radial-gradient(circle at 18% 9%, rgba(255, 255, 255, 0.38) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 38% 48%, rgba(144, 220, 235, 0.38) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 69% 91%, rgba(255, 255, 255, 0.42) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 97% 88%, rgba(144, 220, 235, 0.34) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 4% 52%, rgba(255, 255, 255, 0.44) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 12% 31%, rgba(144, 220, 235, 0.36) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 29% 6%, rgba(255, 255, 255, 0.46) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 35% 70%, rgba(255, 220, 156, 0.36) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 53% 34%, rgba(255, 255, 255, 0.42) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 59% 56%, rgba(144, 220, 235, 0.34) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 76% 7%, rgba(255, 255, 255, 0.4) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 83% 82%, rgba(144, 220, 235, 0.38) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 91% 51%, rgba(255, 255, 255, 0.42) 0 0.8px, transparent 1.6px);
  opacity: 0.74;
  animation: star-float 42s ease-in-out infinite alternate;
}

body::after {
  content: "";
  position: fixed;
  inset: -8% -6%;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 11% 46%, rgba(255, 255, 255, 0.34) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 27% 14%, rgba(144, 220, 235, 0.42) 0 1px, transparent 1.9px),
    radial-gradient(circle at 34% 58%, rgba(255, 220, 156, 0.34) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 46% 83%, rgba(255, 255, 255, 0.4) 0 1px, transparent 1.9px),
    radial-gradient(circle at 61% 29%, rgba(144, 220, 235, 0.36) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 78% 55%, rgba(255, 255, 255, 0.42) 0 1px, transparent 1.9px),
    radial-gradient(circle at 91% 23%, rgba(255, 220, 156, 0.32) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 6% 84%, rgba(144, 220, 235, 0.34) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 21% 62%, rgba(255, 255, 255, 0.38) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 41% 7%, rgba(255, 220, 156, 0.28) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 54% 68%, rgba(255, 255, 255, 0.38) 0 0.9px, transparent 1.7px),
    radial-gradient(circle at 73% 36%, rgba(144, 220, 235, 0.34) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 86% 9%, rgba(255, 255, 255, 0.34) 0 0.8px, transparent 1.6px),
    radial-gradient(circle at 98% 62%, rgba(144, 220, 235, 0.32) 0 0.9px, transparent 1.7px);
  opacity: 0.84;
  animation: particle-float 58s ease-in-out infinite alternate;
}

@keyframes star-float {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    transform: translate3d(22px, -18px, 0);
  }
}

@keyframes particle-float {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }

  to {
    transform: translate3d(-28px, 20px, 0) scale(1.04);
  }
}

@media (prefers-reduced-motion: reduce) {
  body::before,
  body::after {
    animation: none;
  }
}

button {
  font: inherit;
  cursor: pointer;
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 56px;
}

.topbar {
  margin-bottom: 26px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.app-logo {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border: 1px solid rgba(186, 236, 255, 0.72);
  border-radius: 999px;
  object-fit: cover;
  box-shadow: 0 10px 28px rgba(115, 228, 255, 0.24);
}

.eyebrow {
  margin: 0;
  color: #8fe8ff;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p,
dl {
  margin: 0;
}

h1 {
  max-width: 760px;
  color: #f7fbff;
  font-size: clamp(2.05rem, 5.2vw, 4.15rem);
  line-height: 1.02;
  letter-spacing: 0;
  text-shadow: 0 16px 42px rgba(0, 0, 0, 0.36);
}

.picker {
  display: grid;
  grid-template-columns: minmax(150px, 0.72fr) minmax(180px, 0.88fr) minmax(320px, 1.4fr);
  gap: 16px;
}

.step-column[hidden] {
  display: none;
}

.step-column,
.download-card,
.empty-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06)),
    var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.step-column {
  min-height: 240px;
  padding: 20px;
}

.step-heading {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 18px;
}

.step-heading span {
  display: inline-grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  background: rgba(115, 228, 255, 0.13);
  color: var(--accent-dark);
  font-size: 0.86rem;
  font-weight: 850;
}

.step-heading h2,
.download-card h2,
.empty-card h2 {
  font-size: 1.06rem;
  font-weight: 800;
  line-height: 1.25;
}

.step-note {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.option-list {
  display: grid;
  gap: 11px;
  align-content: start;
  max-height: 420px;
  overflow: auto;
  padding-right: 2px;
}

.option-button {
  position: relative;
  width: 100%;
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 10px 14px;
  text-align: left;
  font-weight: 740;
  line-height: 1.28;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

#qualificationList .option-button {
  font-size: 0.98rem;
}

#subjectList .option-button {
  font-size: 0.91rem;
}

#unitList .option-button {
  font-size: 0.85rem;
  font-weight: 560;
}

.unit-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 62px;
  text-decoration: none;
}

.framework-picker-section {
  display: grid;
  gap: 10px;
  border: 1px solid rgba(190, 233, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  padding: 12px;
}

.framework-picker-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 30px;
  gap: 4px 10px;
  align-items: center;
}

.framework-picker-card {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: inherit;
  padding: 10px;
  text-align: left;
  cursor: pointer;
}

.framework-picker-card::after,
.framework-section-card::after {
  content: "⌄";
  grid-column: 3;
  grid-row: 1 / 3;
  align-self: center;
  justify-self: center;
  display: inline-grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  background: rgba(115, 228, 255, 0.12);
  color: var(--accent-dark);
  font-size: 1rem;
  font-weight: 900;
  transition:
    background 0.18s ease,
    color 0.18s ease;
}

.framework-picker-card[aria-expanded="true"]::after,
.framework-section-card[aria-expanded="true"]::after {
  background: var(--gold);
  color: #251704;
}

.framework-picker-card:hover,
.framework-section-card:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
}

.framework-picker-card.selected,
.framework-section-card.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  color: var(--gold-bright);
}

.framework-picker-heading span {
  min-width: 0;
  color: #f8fbff;
  font-size: 0.9rem;
  font-weight: 920;
}

.framework-picker-heading strong {
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
  white-space: nowrap;
}

.framework-picker-heading p {
  grid-column: 1 / 3;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 650;
  line-height: 1.35;
}

.framework-picker-list {
  display: grid;
  gap: 9px;
}

#boardList .option-button {
  min-height: 58px;
  border-width: 2px;
}

.option-button:hover {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(115, 228, 255, 0.15), rgba(255, 155, 213, 0.1));
  color: var(--accent-dark);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 0 0 1px rgba(115, 228, 255, 0.12),
    0 12px 28px rgba(4, 16, 28, 0.22);
}

.option-button.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  color: var(--gold-bright);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    inset 4px 0 0 rgba(244, 190, 93, 0.92),
    0 0 0 1px rgba(244, 190, 93, 0.28),
    0 0 22px rgba(244, 190, 93, 0.2),
    0 14px 34px rgba(244, 190, 93, 0.14);
}

.subject-other-group {
  display: grid;
  gap: 8px;
}

.subject-wrapper-button {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16px;
  align-items: center;
}

.subject-wrapper-button::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.72;
  transition: transform 0.18s ease;
  justify-self: end;
}

.subject-other-group.open > .subject-wrapper-button::after {
  transform: rotate(-135deg);
}

.subject-other-list {
  display: grid;
  gap: 8px;
  padding-left: 10px;
  border-left: 3px solid rgba(115, 228, 255, 0.28);
}

.empty-inline {
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 12px;
  font-weight: 800;
}

.result-panel {
  margin-top: 16px;
}

.subject-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 24px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06)),
    var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  padding: 24px;
}

.subject-overview h2 {
  margin-top: 6px;
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.subject-overview p:not(.eyebrow) {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.course-framework-overview {
  display: grid;
  gap: 14px;
}

.course-framework-section {
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.05)),
    var(--glass);
  box-shadow: var(--shadow);
  padding: 18px;
}

.course-framework-section h3 {
  margin: 0;
  font-size: 1.22rem;
}

.course-framework-section p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.framework-practice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.framework-practice-grid.compact {
  grid-template-columns: 1fr;
}

.framework-practice-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 6px 12px;
  align-items: center;
  min-height: 58px;
  border: 1px solid rgba(190, 233, 255, 0.2);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 12px;
  text-align: left;
}

.framework-practice-card.compact {
  min-height: 0;
  padding: 10px;
}

.framework-practice-button {
  cursor: pointer;
  font: inherit;
  text-decoration: none;
}

.framework-practice-button:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
}

.framework-practice-button.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
}

.framework-practice-card span {
  justify-self: start;
  border-radius: 999px;
  background: rgba(115, 228, 255, 0.13);
  color: var(--accent-dark);
  padding: 4px 8px;
  font-size: 0.72rem;
  font-weight: 900;
}

.framework-practice-card strong {
  color: #f8fbff;
  font-size: 0.96rem;
  line-height: 1.2;
}

.science-practice-detail {
  display: grid;
  grid-column: 1 / -1;
  gap: 12px;
  border: 1px solid rgba(244, 190, 93, 0.32);
  border-radius: 8px;
  background: rgba(244, 190, 93, 0.08);
  padding: 14px;
}

.science-practice-detail h4 {
  margin: 4px 0 0;
  font-size: 1rem;
}

.science-practice-detail p {
  margin: 4px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.science-practice-detail > div > span,
.science-practice-skill-list span {
  display: inline-flex;
  justify-self: start;
  border-radius: 999px;
  background: rgba(115, 228, 255, 0.13);
  color: var(--accent-dark);
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 900;
}

.science-practice-skill-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.science-practice-skill-list article {
  display: grid;
  gap: 5px;
  border: 1px solid rgba(190, 233, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  padding: 10px;
}

.science-practice-skill-list strong,
.science-practice-moves strong {
  color: #f8fbff;
}

.science-practice-moves ul {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.45;
}

.class-finder {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06)),
    var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  padding: 18px;
}

.class-finder-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
  gap: 16px;
  align-items: end;
}

.class-finder-heading h2 {
  margin-top: 4px;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.class-search {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.class-search input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink);
  font: inherit;
  padding: 0 12px;
  text-transform: none;
}

.class-search input:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(115, 228, 255, 0.16);
}

.class-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.class-summary span,
.class-card span {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border-radius: 999px;
  background: rgba(115, 228, 255, 0.13);
  color: var(--accent-dark);
  padding: 0 9px;
  font-size: 0.78rem;
  font-weight: 900;
}

.class-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.class-card {
  display: grid;
  gap: 8px;
  align-content: start;
  min-height: 132px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 14px;
  text-decoration: none;
}

.class-card:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
}

.class-card strong {
  min-width: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.class-card em {
  color: var(--muted);
  font-size: 0.84rem;
  font-style: normal;
  font-weight: 750;
  line-height: 1.35;
}

.class-overflow-note {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.unit-page-body {
  display: grid;
  align-content: start;
  grid-auto-rows: max-content;
  gap: 6px;
}

.unit-topic-section {
  display: grid;
  align-content: start;
  gap: 10px;
  border-top: 1px solid rgba(190, 233, 255, 0.22);
  background: transparent;
  padding: 12px 0 14px;
}

.unit-topic-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.unit-topic-heading h3 {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 4px 0 0;
  color: #f8fbff;
  font-size: 1.22rem;
  font-weight: 900;
  line-height: 1.22;
  text-shadow: 0 0 18px rgba(115, 228, 255, 0.18);
}

.unit-topic-heading h3::before {
  content: "";
  width: 4px;
  height: 1.1em;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent), var(--pink));
  box-shadow: 0 0 14px rgba(115, 228, 255, 0.28);
}

.unit-topic-heading h3 a {
  color: inherit;
  text-decoration: none;
}

.unit-topic-heading h3 a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.unit-class-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: 8px;
}

.unit-class-grid .class-card {
  min-height: 0;
  gap: 6px;
  padding: 7px 9px;
}

.unit-class-grid .class-card strong {
  display: -webkit-box;
  overflow: hidden;
  font-size: 0.8rem;
  line-height: 1.18;
  font-weight: 720;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.unit-class-grid .class-card em {
  justify-self: start;
  border: 1px solid rgba(115, 228, 255, 0.24);
  border-radius: 999px;
  background: rgba(115, 228, 255, 0.12);
  color: var(--accent-dark);
  padding: 2px 6px;
  font-size: 0.66rem;
  font-weight: 820;
  line-height: 1.2;
}

.practice-resource-body {
  display: grid;
  gap: 12px;
}

.practice-resource-section {
  display: grid;
  gap: 10px;
  border-top: 1px solid rgba(190, 233, 255, 0.22);
  padding: 12px 0 14px;
}

.practice-resource-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.practice-resource-section h3 {
  margin: 0;
  color: #f8fbff;
  font-size: 1.12rem;
}

body.resource-open {
  overflow: hidden;
}

.resource-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  background:
    radial-gradient(circle at 18% 12%, rgba(83, 183, 210, 0.22), transparent 24rem),
    linear-gradient(180deg, #06111f 0%, #03050d 100%);
  overflow: hidden;
}

.resource-page {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: min(1240px, calc(100% - 28px));
  height: calc(100vh - 28px);
  margin: 14px auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.055)),
    var(--glass-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  overflow: hidden;
}

.resource-page-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  padding: 18px 20px;
}

.resource-page-header h2 {
  margin-top: 4px;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
}

.unit-breadcrumb {
  color: #bfefff;
  font-size: 0.78rem;
  font-weight: 780;
  line-height: 1.35;
}

.resource-page-body {
  overflow: auto;
  padding: 20px;
}

.resource-page-body > .download-card,
.resource-page-body > .topic-navigator,
.resource-page-body > .quiz-panel {
  margin-top: 0;
}

.resource-shell {
  padding-top: 18px;
}

.resource-topbar {
  margin-bottom: 14px;
}

.standalone-resource-page {
  height: calc(100vh - 96px);
  margin: 0 auto;
}

.download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 24px;
  align-items: start;
  padding: 24px;
}

.download-card h2 {
  margin-bottom: 18px;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

dl {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

dd {
  margin: 0;
  font-weight: 850;
}

.checked {
  margin-top: 18px;
  color: var(--muted);
  line-height: 1.5;
}

.past-paper-section {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.past-paper-section h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.past-paper-section p {
  max-width: 68ch;
  color: var(--muted);
  line-height: 1.5;
}

.paper-links {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.paper-link,
.package-link {
  display: grid;
  gap: 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 12px 14px;
  text-decoration: none;
}

.paper-link:hover,
.package-link:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
}

.paper-link span,
.package-link span {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.package-link {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  color: var(--gold-bright);
}

.actions {
  display: grid;
  gap: 10px;
}

.primary-link,
.secondary-link,
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 0;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 850;
  text-decoration: none;
}

.primary-link,
.primary-button {
  background: linear-gradient(135deg, var(--accent), var(--pink), var(--gold));
  color: #02111f;
}

.secondary-link,
.secondary-button {
  border: 1px solid var(--line);
  background: var(--glass-button);
  color: var(--ink);
}

.quiz-panel {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06)),
    var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  padding: 24px;
}

.next-learning-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.05)),
    var(--glass);
  box-shadow: var(--shadow);
  padding: 18px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.next-learning-card h3 {
  margin: 4px 0 0;
  color: var(--ink);
  font-size: 1.12rem;
  line-height: 1.3;
}

.next-learning-card span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 750;
  line-height: 1.35;
}

.next-learning-link {
  flex: 0 0 auto;
}

.topic-navigator {
  display: grid;
  gap: 14px;
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06)),
    var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  padding: 18px;
}

.topic-navigator-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.topic-navigator-heading h3 {
  margin: 0;
  font-size: 1.2rem;
}

.topic-navigator-heading span {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  border-radius: 999px;
  background: rgba(115, 228, 255, 0.13);
  color: var(--accent-dark);
  padding: 0 10px;
  font-size: 0.82rem;
  font-weight: 850;
  white-space: nowrap;
}

.framework-section-label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 30px;
  gap: 12px;
  align-items: center;
  border-top: 1px solid rgba(190, 233, 255, 0.18);
  padding-top: 12px;
}

.framework-section-label span {
  color: #f8fbff;
  font-size: 0.86rem;
  font-weight: 920;
  text-transform: uppercase;
}

.framework-section-label strong {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  white-space: nowrap;
}

.navigator-practices {
  display: grid;
  gap: 10px;
}

.framework-wrapper-list,
.framework-navigator-section {
  display: grid;
  gap: 10px;
}

.framework-section-card {
  width: 100%;
  border: 1px solid rgba(190, 233, 255, 0.18);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 12px;
  text-align: left;
  cursor: pointer;
}

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

.unit-group {
  display: grid;
  gap: 10px;
}

.unit-button {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  width: 100%;
  min-height: 64px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 13px 14px;
  text-align: left;
}

.unit-button span {
  min-width: 0;
  font-weight: 900;
}

.unit-button strong {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.86rem;
}

.unit-button:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
  color: var(--accent-dark);
}

.unit-button.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  color: var(--gold-bright);
  box-shadow:
    inset 4px 0 0 rgba(244, 190, 93, 0.92),
    0 0 0 1px rgba(244, 190, 93, 0.28),
    0 0 22px rgba(244, 190, 93, 0.2),
    0 14px 34px rgba(244, 190, 93, 0.14);
}

.topic-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 10px;
  padding: 4px 0 0 12px;
}

.topic-wrapper {
  display: grid;
  gap: 8px;
}

.topic-lesson-group {
  display: grid;
  gap: 8px;
  align-content: start;
}

.topic-lesson-group.nested-lesson-group {
  gap: 7px;
  padding-left: 12px;
  border-left: 2px solid rgba(115, 228, 255, 0.24);
}

.topic-label {
  display: grid;
  align-items: center;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
  padding: 8px 12px;
}

.topic-label strong {
  min-width: 0;
  font-size: 0.92rem;
  line-height: 1.25;
}

.topic-label.lesson-wrapper-label {
  min-height: 36px;
  border-style: dashed;
  background: rgba(255, 255, 255, 0.04);
}

.lesson-wrapper-button {
  min-height: 50px;
  background: var(--glass-button);
}

.section-topic-button {
  min-height: 50px;
  background: var(--glass-button);
}

.topic-button {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 58px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 10px 12px 10px 16px;
  text-align: left;
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(23, 32, 42, 0.045);
}

.topic-button::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: #9ac8ce;
  opacity: 0.95;
}

.topic-button.lesson-topic-button {
  grid-template-columns: minmax(0, 1fr);
}

.topic-button.has-lessons {
  grid-template-columns: 30px minmax(0, 1fr) auto 16px;
}

.topic-button.has-lessons::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.72;
  transition: transform 0.18s ease;
}

.topic-wrapper.open > .topic-button.has-lessons::after {
  transform: rotate(-135deg);
}

.topic-button span {
  position: relative;
  display: inline-grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(115, 228, 255, 0.3);
  background: rgba(115, 228, 255, 0.12);
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 900;
}

.topic-button.lesson-topic-button span {
  width: auto;
  min-width: 86px;
  border-radius: 999px;
  padding: 0 8px;
}

.topic-button strong {
  position: relative;
  min-width: 0;
  font-size: 0.94rem;
  line-height: 1.3;
}

.topic-button em {
  position: relative;
  color: var(--muted);
  font-size: 0.78rem;
  font-style: normal;
  font-weight: 850;
  white-space: nowrap;
}

.topic-button:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
}

.topic-button:hover::before {
  background: var(--accent);
}

.topic-button.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  color: var(--gold-bright);
  box-shadow:
    inset 4px 0 0 rgba(244, 190, 93, 0.92),
    0 0 0 1px rgba(244, 190, 93, 0.28),
    0 0 22px rgba(244, 190, 93, 0.2),
    0 14px 34px rgba(244, 190, 93, 0.14);
}

.topic-button.selected::before {
  background: var(--gold);
}

.topic-button.selected span {
  border-color: var(--gold);
  background: var(--gold);
  color: #251704;
}

.topic-lesson-list {
  display: grid;
  gap: 8px;
  padding-left: 40px;
}

.topic-lesson-button {
  position: relative;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  color: var(--ink);
  padding: 8px 10px;
  text-align: left;
}

.topic-lesson-button span {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 900;
}

.topic-lesson-button strong {
  min-width: 0;
  font-size: 0.88rem;
  line-height: 1.25;
}

.topic-lesson-button:hover {
  border-color: var(--accent);
  background: var(--glass-button-hover);
}

.topic-lesson-button.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  color: var(--gold-bright);
  box-shadow:
    inset 4px 0 0 rgba(244, 190, 93, 0.92),
    0 0 0 1px rgba(244, 190, 93, 0.28),
    0 0 18px rgba(244, 190, 93, 0.18);
}

.topic-empty {
  margin-top: 16px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  padding: 22px;
}

.topic-empty h3 {
  margin: 0;
  font-size: 1.1rem;
}

.topic-empty p {
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.5;
}

.content-list-section {
  margin-top: 16px;
  border-color: rgba(115, 228, 255, 0.28);
}

.content-list-section .collapsible-heading {
  background: rgba(115, 228, 255, 0.14);
}

.content-list-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
}

.content-list-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.content-list-card {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  padding: 14px;
}

.content-list-card-heading {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: start;
}

.content-list-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.content-list-card dl {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 8px;
}

.content-list-card dt {
  font-size: 0.7rem;
}

.content-list-card dd {
  font-size: 0.92rem;
}

.content-list-card ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.35;
}

.content-list-card li span {
  display: inline-flex;
  margin-left: 5px;
  border-radius: 999px;
  background: #e9f3f4;
  color: var(--accent-dark);
  padding: 2px 7px;
  font-size: 0.68rem;
  font-weight: 900;
  vertical-align: middle;
}

.quiz-heading {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.quiz-heading h2 {
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.quiz-heading span {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  border-radius: 999px;
  background: #e9f3f4;
  color: var(--accent-dark);
  padding: 0 12px;
  font-size: 0.82rem;
  font-weight: 850;
  white-space: nowrap;
}

.quiz-intro {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.active-lesson-title {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 800;
}

.teaching-outline {
  display: grid;
  gap: 16px;
  background: transparent;
}

.outline-header h3,
.teaching-outline h4 {
  margin: 0;
}

.outline-header h3 {
  font-size: 1.25rem;
}

.outline-focus {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.5;
}

.outline-details {
  display: grid;
  gap: 8px;
  margin: -6px 0 0;
  max-width: 76ch;
  color: var(--muted);
  line-height: 1.6;
}

.outline-details p {
  margin: 0;
}

.outline-image {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.outline-image img {
  display: block;
  width: 100%;
  height: auto;
}

.outline-image figcaption {
  border-top: 1px solid var(--line);
  padding: 8px 10px;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.outline-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.teaching-outline ul,
.teaching-outline ol {
  display: grid;
  gap: 8px;
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.45;
}

.vocab-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 10px 0 0;
  border-top: 1px solid var(--line);
}

.vocab-list div {
  display: grid;
  grid-template-columns: minmax(120px, 0.42fr) minmax(0, 1fr);
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding: 8px 0;
}

.vocab-list dt {
  color: var(--accent-dark);
  font-weight: 850;
}

.vocab-list dd {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.lesson-map {
  display: grid;
  gap: 10px;
}

.lesson-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.lesson-list article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  padding: 12px;
}

.lesson-list article.selected {
  border-color: var(--gold);
  background: var(--glass-button-selected);
  box-shadow:
    inset 4px 0 0 rgba(244, 190, 93, 0.92),
    0 0 0 1px rgba(244, 190, 93, 0.28),
    0 0 18px rgba(244, 190, 93, 0.18);
}

.lesson-list strong {
  color: var(--accent-dark);
}

.lesson-list p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.organelle-map {
  display: grid;
  gap: 10px;
}

.organelle-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.organelle-list article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  padding: 12px;
}

.organelle-list strong {
  color: var(--accent-dark);
}

.organelle-list p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.collapsible-section {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.055);
  overflow: hidden;
}

.collapsible-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 18px;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  width: 100%;
  min-height: 58px;
  border: 0;
  border-bottom: 1px solid rgba(23, 32, 42, 0.12);
  background: var(--ink);
  color: #fff;
  padding: 14px 16px;
  text-align: left;
}

.collapsible-heading::after {
  content: "";
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-135deg);
  opacity: 0.78;
  transition: transform 0.18s ease;
}

.collapsible-section.collapsed .collapsible-heading::after {
  transform: rotate(45deg);
}

.collapsible-heading span {
  min-width: 0;
  font-size: 1.2rem;
  font-weight: 950;
  line-height: 1.1;
}

.collapsible-heading strong {
  flex: 0 0 auto;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.92rem;
  font-weight: 850;
}

.collapsible-content {
  display: grid;
  gap: 14px;
  padding: 14px;
}

.collapsible-content[hidden] {
  display: none;
}

.study-guide {
  margin-top: 18px;
  border-color: rgba(79, 112, 132, 0.28);
}

.study-guide .collapsible-heading {
  background: #31495a;
}

.study-guide .collapsible-heading strong {
  color: #fff;
  font-size: 1.2rem;
  font-weight: 950;
  line-height: 1.1;
}

.video-lesson {
  margin-top: 16px;
  border-color: rgba(115, 228, 255, 0.24);
}

.video-lesson .collapsible-heading {
  background:
    linear-gradient(135deg, rgba(115, 228, 255, 0.16), rgba(255, 211, 106, 0.1)),
    rgba(255, 255, 255, 0.07);
  color: #f7fbff;
}

.video-platform-badges {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 5px;
}

.resource-page-header .video-platform-badges {
  flex: 0 0 auto;
  margin-left: auto;
}

.video-platform-link i {
  font-style: normal;
}

.video-platform-link {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  min-height: 26px;
  align-items: center;
  gap: 4px;
  padding: 3px 7px;
  border: 1px solid rgba(186, 236, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--gold-bright);
  font-size: 0.76rem;
  font-weight: 900;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.video-platform-link:hover,
.video-platform-link:focus-visible {
  border-color: rgba(255, 228, 169, 0.62);
  background: rgba(244, 190, 93, 0.14);
  color: #fff;
}

.video-hub {
  display: grid;
  gap: 12px;
}

.video-hub-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 720;
  line-height: 1.5;
}

.video-player-shell {
  overflow: hidden;
  min-height: 210px;
  border: 1px solid rgba(186, 236, 255, 0.28);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(8, 18, 47, 0.72), rgba(35, 61, 111, 0.56)),
    rgba(255, 255, 255, 0.06);
}

.video-player-shell iframe {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
}

.video-player-shell.external-video-shell {
  display: flex;
  min-height: 0;
  align-items: flex-start;
  overflow: visible;
  border: 0;
  background: transparent;
}

.video-external-notice {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  padding: 5px 8px;
  border: 1px solid rgba(186, 236, 255, 0.28);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.07);
}

.video-external-notice p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 720;
  line-height: 1.3;
}

.video-external-notice a {
  color: var(--gold-bright);
  font-weight: 900;
}

.video-external-notice a:hover,
.video-external-notice a:focus-visible {
  color: #fff;
}

.video-source-picker {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(126px, 1fr));
  gap: 8px;
}

.video-source-button {
  display: grid;
  gap: 4px;
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid rgba(186, 236, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  color: inherit;
  text-align: left;
}

.video-source-button:hover,
.video-source-button:focus-visible,
.video-source-button.active {
  border-color: rgba(115, 228, 255, 0.62);
  background: rgba(115, 228, 255, 0.12);
}

.video-source-button span {
  color: #fff;
  font-size: 0.92rem;
  font-weight: 900;
}

.video-source-button strong {
  color: var(--gold-bright);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.video-platform-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.video-platform-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid rgba(186, 236, 255, 0.26);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  color: #f7fbff;
  font-size: 0.84rem;
  font-weight: 850;
  text-decoration: none;
}

.video-platform-links a:hover,
.video-platform-links a:focus-visible {
  border-color: rgba(255, 228, 169, 0.58);
  background: rgba(244, 190, 93, 0.14);
}

.quiz-drill {
  margin-top: 16px;
}

.quiz-drill .collapsible-heading {
  border-bottom-color: rgba(115, 228, 255, 0.18);
  background:
    linear-gradient(135deg, rgba(115, 228, 255, 0.18), rgba(255, 155, 213, 0.12)),
    rgba(255, 255, 255, 0.075);
  color: #f7fbff;
}

.quiz-drill .collapsible-heading strong {
  color: var(--gold-bright);
}

.empty-quiz-section .collapsible-content {
  background: rgba(255, 255, 255, 0.035);
}

.empty-quiz-section p {
  margin: 0;
  color: var(--muted);
  font-weight: 760;
  line-height: 1.5;
}

.quiz-form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
  width: 100%;
}

.student-name {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 850;
}

.student-name input,
.report-box textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink);
  font: inherit;
}

.student-name input {
  min-height: 46px;
  padding: 0 12px;
}

.quiz-question {
  display: grid;
  gap: 10px;
  width: 100%;
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.question-prompt {
  margin: 0;
  display: block;
  width: 100%;
  max-width: 100%;
  font-weight: 850;
  line-height: 1.4;
  white-space: normal;
}

.choice {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  width: 100%;
  min-width: 0;
  color: var(--ink);
  line-height: 1.45;
}

.choice span {
  min-width: 0;
}

.choice strong {
  color: var(--accent-dark);
}

.choice input {
  margin-top: 3px;
}

.quiz-question.locked .choice {
  opacity: 0.72;
}

.quiz-question.locked .choice.correct-choice {
  opacity: 1;
  color: #37620f;
  font-weight: 850;
}

.quiz-question.locked .choice.incorrect-choice {
  opacity: 1;
  color: var(--ink);
}

.question-feedback {
  color: var(--muted);
  line-height: 1.5;
}

.question-feedback span {
  display: block;
}

.feedback-status {
  font-weight: 950;
  color: var(--ink);
}

.feedback-status.correct {
  color: #285f28;
}

.feedback-status.incorrect {
  color: #111827;
}

.feedback-answer {
  color: var(--ink);
  font-weight: 850;
}

.feedback-explanation {
  color: var(--muted);
}

.math-int,
.math-lim,
.math-frac {
  display: inline-flex;
  align-items: center;
  vertical-align: middle;
  font-family: "Times New Roman", Cambria, Georgia, serif;
  font-size: 1.04em;
}

.math-int sub,
.math-lim sub {
  margin-left: 1px;
}

.math-frac {
  flex-direction: column;
  gap: 1px;
  line-height: 1;
  margin: 0 2px;
}

.math-frac span:first-child {
  border-bottom: 1px solid currentColor;
  padding: 0 2px 1px;
}

.math-frac span:last-child {
  padding: 1px 2px 0;
}

.quiz-question.correct {
  border-color: rgba(11, 107, 117, 0.45);
  background: rgba(115, 228, 255, 0.1);
}

.quiz-question.incorrect {
  border-color: rgba(174, 80, 72, 0.5);
  background: rgba(240, 111, 98, 0.12);
}

.short-answer-section {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.055);
  padding: 16px;
}

.short-answer-section h3 {
  margin: 0;
  font-size: 1rem;
}

.short-answer {
  display: grid;
  gap: 8px;
  font-weight: 850;
  line-height: 1.4;
}

.short-answer label {
  display: grid;
  gap: 8px;
}

.short-answer textarea {
  min-height: 120px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  color: var(--ink);
  font: inherit;
  line-height: 1.5;
  resize: vertical;
}

.sample-answer-button {
  justify-self: start;
  min-height: 40px;
}

.sample-answer {
  margin: 0;
  border-left: 4px solid var(--accent);
  background: rgba(255, 255, 255, 0.07);
  padding: 10px 12px;
  color: var(--muted);
  font-weight: 700;
  line-height: 1.5;
}

.sample-answer[hidden] {
  display: none;
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.quiz-score {
  color: var(--accent-dark);
  font-weight: 850;
}

.report-box {
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.055);
  padding: 14px;
}

.report-box[hidden] {
  display: none;
}

.report-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.copy-status {
  color: var(--accent-dark);
  font-weight: 800;
}

.report-box textarea {
  min-height: 220px;
  padding: 12px;
  line-height: 1.5;
  resize: vertical;
}

.empty-card {
  padding: 24px;
}

.empty-card p {
  margin-top: 8px;
  color: var(--muted);
}

@media (max-width: 820px) {
  .app-shell {
    width: min(100% - 24px, 640px);
    padding-top: 24px;
  }

  h1 {
    font-size: clamp(2rem, 12vw, 3.15rem);
    line-height: 1.05;
  }

  .topbar {
    margin-bottom: 22px;
  }

  .picker,
  .download-card,
  .subject-overview,
  .class-finder-heading,
  .class-grid,
  .framework-practice-grid,
  .framework-practice-grid.compact,
  .science-practice-skill-list,
  dl,
  .outline-grid,
  .organelle-list,
  .vocab-list div,
  .content-list-grid,
  .topic-list {
    grid-template-columns: 1fr;
  }

  .quiz-heading,
  .content-list-card-heading,
  .resource-page-header,
  .next-learning-card {
    display: grid;
  }

  .resource-page {
    width: min(100% - 16px, 640px);
    height: calc(100vh - 16px);
    margin: 8px auto;
  }

  .resource-page-body {
    padding: 14px;
  }

  .step-column {
    min-height: auto;
    padding: 18px;
  }

}