:root {
  --ink: #202a57;
  --ink-muted: #667097;
  --brand: #5668b4;
  --brand-strong: #4053a2;
  --canvas: #f6f7ff;
  --surface: rgb(255 255 255 / 72%);
  --line: #dfe3f3;
  --selected: #e3e8ff;
  --success: #c8ecd1;
  --danger: #f6c7c7;
  --radius-lg: 1.5rem;
  --radius-md: 0.75rem;
  --shadow: 0 22px 60px rgb(48 61 119 / 14%);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-width: 320px;
  color: var(--ink);
  font-family: "Karla", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
li {
  font: inherit;
}

ul {
  list-style: none;
}

.bg-light {
  background-color: var(--canvas);
}

.quiz {
  isolation: isolate;
  position: relative;
  display: grid;
  min-height: 100vh;
  place-items: center;
  overflow: hidden;
  padding: clamp(1.25rem, 5vw, 4.5rem) clamp(1rem, 4vw, 3rem);
  background:
    radial-gradient(circle at 10% 90%, rgb(204 229 255 / 75%), transparent 28rem),
    radial-gradient(circle at 90% 12%, rgb(255 229 142 / 45%), transparent 28rem),
    var(--canvas);
}

.quiz img {
  position: absolute;
  z-index: -1;
  width: clamp(11rem, 22vw, 20rem);
  pointer-events: none;
  opacity: 0.82;
}

.quiz .upper-top {
  top: -0.75rem;
  right: -0.75rem;
}

.quiz .lower-bottom {
  bottom: -0.75rem;
  left: -0.75rem;
}

.quiz .container {
  display: flex;
  width: min(100%, 52rem);
  flex-direction: column;
  align-items: center;
  padding: clamp(1.75rem, 5vw, 3.75rem);
  border: 1px solid rgb(255 255 255 / 80%);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.quizzical-title {
  letter-spacing: -0.075em;
  color: var(--ink);
  font-size: clamp(3.25rem, 10vw, 5.5rem);
  font-weight: 800;
  line-height: 0.9;
}

.quizzical-title + .description {
  max-width: 25rem;
  margin: 1.25rem auto 2rem;
  color: var(--ink-muted);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 500;
  line-height: 1.55;
  text-align: center;
}

.start-quiz-btn,
.check-answers,
.play-again {
  border: 0;
  border-radius: var(--radius-md);
  background: var(--brand);
  box-shadow: 0 8px 18px rgb(86 104 180 / 26%);
  color: #fff;
  cursor: pointer;
  font-weight: 700;
  transition: transform 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.start-quiz-btn {
  min-width: 10.75rem;
  padding: 1rem 1.8rem;
  font-size: 1.05rem;
}

.check-answers,
.play-again {
  margin-top: 2rem;
  padding: 0.75rem 1.35rem;
  font-size: 0.95rem;
}

.start-quiz-btn:hover,
.check-answers:hover,
.play-again:hover {
  background: var(--brand-strong);
  box-shadow: 0 12px 24px rgb(64 83 162 / 30%);
  transform: translateY(-2px);
}

.start-quiz-btn:active,
.check-answers:active,
.play-again:active {
  transform: translateY(0);
}

.start-quiz-btn:disabled,
.check-answers:disabled,
.play-again:disabled {
  cursor: wait;
  opacity: 0.7;
  transform: none;
}

.start-quiz-btn:focus-visible,
.check-answers:focus-visible,
.play-again:focus-visible,
.choices .choice:focus-visible {
  outline: 3px solid #83d1ff;
  outline-offset: 3px;
}

.question {
  width: 100%;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.question:first-child {
  padding-top: 0;
}

.quest {
  margin-bottom: 1rem;
  color: var(--ink);
  font-size: clamp(1.08rem, 2.5vw, 1.28rem);
  line-height: 1.35;
}

.choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.choices .choice {
  display: flex;
  min-width: 0;
  min-height: 3.15rem;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 0.9rem;
  border: 1.5px solid #9da9d7;
  border-radius: 0.65rem;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.94rem;
  font-weight: 600;
  line-height: 1.2;
  overflow-wrap: anywhere;
  text-align: center;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

/* An unpaired final choice becomes a deliberate full-width option. */
.choices .choice:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.choices .choice:hover:not(.disabled) {
  border-color: var(--brand);
  background: rgb(227 232 255 / 55%);
  transform: translateY(-1px);
}

.choices .choice.checked {
  border-color: var(--selected);
  background-color: var(--selected);
}

.correct {
  border-color: var(--success) !important;
  background-color: var(--success);
}

.wrong {
  border-color: var(--danger) !important;
  background-color: var(--danger);
}

.disabled {
  opacity: 0.48;
}

.results {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding-top: 1.25rem;
}

.results p {
  color: var(--ink);
  font-size: 1rem;
  font-weight: 700;
}

.results .play-again {
  margin-top: 0;
}

@media (max-width: 34rem) {
  .quiz .container {
    padding: 1.5rem 1.2rem;
  }

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

  .choices .choice:last-child:nth-child(odd) {
    grid-column: auto;
  }

  .results {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}