:root {
  color-scheme: light;
  --ink: #15202b;
  --muted: #15202b;
  --line: rgba(255, 255, 255, 0.78);
  --glass: rgba(255, 255, 255, 0.2);
  --glass-strong: rgba(255, 255, 255, 0.42);
  --teal: #0e8f9c;
  --coral: #ec6f66;
  --lime: #9bbf3f;
  --blue: #4f7fe8;
  --shadow: 0 28px 80px rgba(44, 104, 154, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.9), inset 0 -1px 0 rgba(255, 255, 255, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: Merriweather, Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    linear-gradient(118deg, rgba(255, 255, 255, 0.9), rgba(232, 247, 246, 0.36) 42%, rgba(255, 255, 255, 0.72) 76%),
    radial-gradient(circle at 16% 12%, rgba(176, 226, 220, 0.22), transparent 34%),
    radial-gradient(circle at 88% 18%, rgba(241, 249, 252, 0.86), transparent 30%),
    radial-gradient(circle at 52% 94%, rgba(213, 235, 232, 0.22), transparent 40%),
    linear-gradient(135deg, #ffffff 0%, #f3fbfa 48%, #e7f4f2 100%);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.custom-cursor {
  display: none;
}

@media (pointer: fine) {
  body.has-custom-cursor,
  body.has-custom-cursor * {
    cursor: none;
  }

  .custom-cursor {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    width: 18px;
    aspect-ratio: 1;
    border: 1px solid rgba(21, 32, 43, 0.52);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.24);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.9),
      0 10px 24px rgba(44, 104, 154, 0.18);
    display: block;
    opacity: 0;
    pointer-events: none;
    transform: translate3d(-50%, -50%, 0) scale(0.8);
    transition: opacity 140ms ease, transform 140ms ease, background 140ms ease, border-color 140ms ease;
  }

  .custom-cursor.is-visible {
    opacity: 1;
  }

  .custom-cursor.is-active {
    border-color: rgba(14, 143, 156, 0.74);
    background: rgba(255, 255, 255, 0.36);
    transform: translate3d(-50%, -50%, 0) scale(1.55);
  }
}

.app-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(18px, 3vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
  gap: clamp(18px, 3vw, 34px);
  align-items: stretch;
}

.study-pane,
.quiz-pane {
  min-width: 0;
}

.topbar,
.quiz-header,
.passage-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.topbar {
  display: block;
}

.title-stack {
  display: grid;
  justify-items: start;
  gap: 8px;
}

.title-float {
  display: block;
  position: relative;
  width: fit-content;
  max-width: 100%;
  transform-origin: left center;
  transition: transform 200ms ease, text-shadow 200ms ease, color 200ms ease;
}

.title-float:hover {
  transform: translateY(-3px) scale(1.012);
  text-shadow: 0 16px 34px rgba(44, 104, 154, 0.22);
}

.title-eyebrow {
  margin: 0;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2rem, 4.7vw, 4.8rem);
  line-height: 1.04;
  max-width: 820px;
}

.title-heading {
  max-width: 820px;
}

.byline {
  margin: 0;
  color: rgba(21, 32, 43, 0.72);
  font-size: clamp(0.98rem, 1.5vw, 1.18rem);
  font-weight: 700;
  line-height: 1.35;
}

h2 {
  font-size: clamp(1.22rem, 2vw, 1.65rem);
  line-height: 1.22;
}

p {
  line-height: 1.65;
}

.primary-button,
.secondary-button,
.answer-option {
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--ink);
  box-shadow: 0 10px 30px rgba(36, 52, 66, 0.08);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background 180ms ease;
}

.primary-button:hover,
.secondary-button:hover,
.answer-option:hover {
  transform: translateY(-2px) scale(1.025);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.86), 0 18px 42px rgba(44, 104, 154, 0.2);
}

.primary-button:active,
.secondary-button:active,
.answer-option:active {
  transform: translateY(0) scale(0.99);
}

.primary-button:focus-visible,
.secondary-button:focus-visible,
.answer-option:focus-within {
  outline: 3px solid rgba(79, 127, 232, 0.32);
  outline-offset: 3px;
}

.topic-band {
  position: relative;
  margin: clamp(20px, 4vw, 36px) 0 18px;
  min-height: 340px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 22px;
  overflow: hidden;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.38), rgba(255, 255, 255, 0.08) 54%, rgba(255, 255, 255, 0.2)),
    rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  backdrop-filter: blur(34px) saturate(190%) contrast(104%);
  -webkit-backdrop-filter: blur(34px) saturate(190%) contrast(104%);
  padding: clamp(18px, 3vw, 28px);
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease, background 220ms ease;
}

.topic-band::after,
.glass-panel::after,
.passage-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.78), transparent 19%, rgba(255, 255, 255, 0.18) 47%, transparent 72%),
    radial-gradient(circle at 20% 8%, rgba(255, 255, 255, 0.7), transparent 18%),
    radial-gradient(circle at 78% 86%, rgba(255, 255, 255, 0.18), transparent 28%),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px 16px);
  opacity: 0.74;
  mix-blend-mode: screen;
}

.topic-band::after,
.glass-panel::after,
.passage-card::after {
  box-shadow:
    inset 1px 1px 0 rgba(255, 255, 255, 0.72),
    inset -1px -1px 0 rgba(255, 255, 255, 0.18);
}

.topic-content {
  position: relative;
  z-index: 1;
  min-height: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-content: end;
  transition: filter 320ms ease, opacity 320ms ease;
}

.topic-chip {
  position: relative;
  z-index: 1;
  min-height: 150px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: 18px;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.46), rgba(255, 255, 255, 0.12)),
    rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.94), inset 0 -1px 0 rgba(255, 255, 255, 0.22), 0 18px 42px rgba(44, 104, 154, 0.1);
  backdrop-filter: blur(32px) saturate(190%);
  -webkit-backdrop-filter: blur(32px) saturate(190%);
  transition: transform 200ms ease, box-shadow 200ms ease, background 200ms ease;
}

.passage-heading,
.passage-text {
  transition: filter 320ms ease, opacity 320ms ease;
}

.topic-chip:hover {
  transform: translateY(-3px) scale(1.012);
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.18)),
    rgba(255, 255, 255, 0.16);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.98), inset 0 -1px 0 rgba(255, 255, 255, 0.24), 0 24px 56px rgba(44, 104, 154, 0.18);
}

.essential-question {
  min-height: 170px;
}

.definition-card {
  grid-column: 1 / -1;
  min-height: auto;
  padding-right: min(28px, 4vw);
}

.topic-chip span,
.topic-chip strong {
  display: block;
}

.topic-chip span {
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 900;
}

.topic-chip strong {
  margin-top: 16px;
  font-size: 1.05rem;
}

.essential-question strong {
  font-size: clamp(1.2rem, 2.2vw, 1.7rem);
  line-height: 1.18;
}

.topic-chip p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.topic-band.is-blurred .topic-content {
  filter: blur(8px);
  opacity: 0.34;
  user-select: none;
}

.passage-card,
.glass-panel {
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 22px;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.36), rgba(255, 255, 255, 0.08) 58%, rgba(255, 255, 255, 0.18)),
    var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(36px) saturate(195%) contrast(104%);
  -webkit-backdrop-filter: blur(36px) saturate(195%) contrast(104%);
  overflow: hidden;
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease, background 220ms ease;
}

.topic-band:hover,
.passage-card:hover,
.glass-panel:hover,
.quiz-station-header:hover {
  transform: translateY(-4px) scale(1.006);
  border-color: rgba(255, 255, 255, 0.92);
  box-shadow:
    0 34px 92px rgba(44, 104, 154, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.96),
    inset 0 -1px 0 rgba(255, 255, 255, 0.32);
}

.passage-card {
  padding: clamp(20px, 3vw, 34px);
}

.passage-heading,
.passage-text,
.glass-panel > * {
  position: relative;
  z-index: 1;
}

.passage-heading span {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.passage-text {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

.passage-text p {
  margin: 0;
  color: var(--ink);
  font-size: 1rem;
}

.passage-card.is-blurred .passage-heading,
.passage-card.is-blurred .passage-text {
  filter: blur(8px);
  opacity: 0.42;
  user-select: none;
}

.quiz-pane {
  display: grid;
  align-content: start;
  gap: 14px;
  padding-top: clamp(198px, 19vw, 250px);
}

.quiz-station-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px 16px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 22px;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.34), rgba(255, 255, 255, 0.08)),
    rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  backdrop-filter: blur(30px) saturate(190%);
  -webkit-backdrop-filter: blur(30px) saturate(190%);
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease, background 220ms ease;
}

.quiz-station-header .eyebrow {
  margin-bottom: 6px;
}

.quiz-station-header h2 {
  font-size: clamp(1.08rem, 1.5vw, 1.35rem);
}

.glass-panel {
  padding: clamp(20px, 3vw, 30px);
}

.quiz-intro {
  min-height: 349px;
  display: grid;
  align-content: center;
}

.quiz-intro p:not(.eyebrow),
.results-panel p {
  color: var(--muted);
  margin: 14px 0 22px;
}

.primary-button {
  min-height: 52px;
  width: 100%;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--ink);
  border-color: rgba(21, 32, 43, 0.16);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.64), rgba(255, 255, 255, 0.18)),
    rgba(255, 255, 255, 0.22);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.94), inset 0 -1px 0 rgba(255, 255, 255, 0.24), 0 16px 34px rgba(44, 104, 154, 0.16);
  font-weight: 800;
}

.secondary-button {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 15px;
  border-radius: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--ink);
  border-color: rgba(21, 32, 43, 0.14);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.16)),
    rgba(255, 255, 255, 0.18);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 12px 28px rgba(44, 104, 154, 0.12);
  font-weight: 800;
}

.primary-button:hover {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.24)),
    rgba(255, 255, 255, 0.28);
}

.quiz-form {
  display: grid;
  gap: 20px;
}

.pill {
  flex: 0 0 auto;
  padding: 8px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.76);
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 800;
}

#questions {
  display: grid;
  gap: 18px;
}

.question-card {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 18px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.34), rgba(255, 255, 255, 0.08)),
    rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.82), inset 0 -1px 0 rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease, background 200ms ease;
}

.question-card:hover,
.review-item:hover {
  transform: translateY(-3px) scale(1.01);
  border-color: rgba(255, 255, 255, 0.9);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.46), rgba(255, 255, 255, 0.12)),
    rgba(255, 255, 255, 0.14);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.92),
    inset 0 -1px 0 rgba(255, 255, 255, 0.24),
    0 18px 44px rgba(44, 104, 154, 0.14);
}

.question-card h3 {
  margin: 0 0 12px;
  font-size: 0.98rem;
  line-height: 1.5;
}

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

.answer-option {
  width: 100%;
  min-height: 46px;
  padding: 11px 13px;
  border-radius: 15px;
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 10px;
  align-items: center;
  text-align: left;
}

.answer-option input {
  accent-color: var(--teal);
}

.answer-option:has(input:checked) {
  border-color: rgba(21, 32, 43, 0.24);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.18)),
    rgba(255, 255, 255, 0.18);
}

.results-panel {
  display: grid;
  gap: 20px;
}

.score-ring {
  width: 138px;
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  justify-self: center;
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.86) 56%, transparent 58%),
    conic-gradient(var(--teal) var(--score-angle, 0deg), rgba(101, 114, 129, 0.16) 0);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.85), 0 18px 42px rgba(36, 52, 66, 0.12);
}

.score-ring span {
  font-size: 1.85rem;
  font-weight: 900;
}

.score-ring small {
  margin-top: 40px;
  position: absolute;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.review-list {
  display: grid;
  gap: 12px;
}

.review-item {
  padding: 15px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.36), rgba(255, 255, 255, 0.08)),
    rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.82), inset 0 -1px 0 rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease, background 200ms ease;
}

.review-item strong {
  display: block;
  margin-bottom: 8px;
}

.review-item p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.correct {
  color: #0f7c55;
}

.incorrect {
  color: #c84c44;
}

.hidden {
  display: none;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .study-pane {
    display: contents;
  }

  .topbar {
    order: 1;
  }

  .quiz-pane {
    order: 2;
    padding-top: 0;
  }

  .quiz-intro {
    min-height: auto;
    display: block;
  }

  .topic-band {
    order: 3;
  }

  .passage-card {
    order: 4;
  }
}

@media (max-width: 620px) {
  .app-shell {
    padding: 14px;
  }

  body.has-custom-cursor,
  body.has-custom-cursor * {
    cursor: auto;
  }

  .topbar,
  .quiz-header,
  .passage-heading {
    align-items: flex-start;
  }

  .topic-band {
    min-height: 260px;
    grid-template-columns: 1fr;
  }

  .definition-card {
    grid-column: auto;
  }

  .topic-chip {
    min-height: auto;
  }

}