/* Quiz-only feedback colors stay green even when the site accent is blue. */
section.quiz {
  --quiz-success: #187b3f;
  --quiz-success-hover: #126532;
  --quiz-success-ink: #145d32;
  --quiz-success-copy: #235e3b;
  --quiz-success-option: #ebf8ef;
  --quiz-success-result: #dff5e7;
  --quiz-success-border: #49a96a;
  --quiz-success-on: #ffffff;
  --quiz-success-icon: #ffffff;
  --quiz-error: #a6343f;
  --quiz-error-ink: #863540;
  --quiz-error-bg: #fff1f2;
  --quiz-error-border: #d5828a;
  --quiz-confetti-green: #279b52;
  --quiz-confetti-gold: #dca63a;
  --quiz-confetti-blue: #6898d3;
  --quiz-confetti-purple: #a282d0;
}

section.quiz .quiz-options > label.quiz-option {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) 26px;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 52px;
  transition: background-color 160ms ease, border-color 160ms ease;
}

section.quiz .quiz-option > input[type="radio"] {
  width: 18px;
  height: 18px;
  margin: 0;
  flex: none;
}

section.quiz .quiz-option-text {
  display: block;
  min-width: 0;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

section.quiz .quiz-option-mark {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 17px;
  font-weight: 750;
  line-height: 1;
  visibility: hidden;
}

section.quiz .quiz-options > label.quiz-option.is-correct,
section.quiz .quiz-options > label.quiz-option.is-correct:hover,
section.quiz .quiz-options > label.quiz-option.is-correct:has(input:checked),
section.quiz .quiz-options > label.quiz-option.is-correct:has(input:disabled) {
  background: var(--quiz-success-option);
  border-color: var(--quiz-success-border);
  box-shadow: inset 3px 0 0 var(--quiz-success);
  color: var(--quiz-success-ink);
  opacity: 1;
  filter: none;
}

section.quiz .quiz-option.is-correct .quiz-option-text {
  color: var(--quiz-success-ink);
  font-weight: 650;
  opacity: 1;
}

section.quiz .quiz-option.is-correct .quiz-option-mark {
  visibility: visible;
  background: var(--quiz-success);
  color: var(--quiz-success-on);
}

/* A custom checked radio keeps the completed row legible when disabled. */
section.quiz .quiz-option.is-correct > input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  border: 2px solid var(--quiz-success);
  border-radius: 50%;
  background: radial-gradient(circle, var(--quiz-success) 0 4px, transparent 4.5px);
  opacity: 1;
  filter: none;
}

section.quiz .quiz-option:has(input:disabled) { cursor: default; }

section.quiz .quiz-options > label.quiz-option.is-incorrect,
section.quiz .quiz-options > label.quiz-option.is-incorrect:hover,
section.quiz .quiz-options > label.quiz-option.is-incorrect:has(input:checked) {
  background: var(--quiz-error-bg);
  border-color: var(--quiz-error-border);
  color: var(--quiz-error-ink);
}

section.quiz .quiz-option.is-incorrect > input[type="radio"] {
  accent-color: var(--quiz-error);
}

section.quiz .quiz-feedback {
  position: relative;
  isolation: isolate;
  width: 100%;
  min-width: 0;
  margin: 16px 0 0;
  line-height: 1.75;
  overflow-wrap: anywhere;
}

section.quiz .quiz-feedback:empty { display: none; }
section.quiz .quiz-footer [hidden] { display: none !important; }

section.quiz .quiz-feedback.is-correct,
section.quiz .quiz-feedback.is-incorrect {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 15px;
  box-sizing: border-box;
  padding: 20px 25px;
  border: 1px solid;
  border-radius: 10px;
}

section.quiz .quiz-feedback.is-correct {
  background: var(--quiz-success-result);
  border-color: var(--quiz-success-border);
  box-shadow: inset 4px 0 0 var(--quiz-success);
  color: var(--quiz-success-copy);
}

section.quiz .quiz-feedback.is-incorrect {
  background: var(--quiz-error-bg);
  border-color: var(--quiz-error-border);
  color: var(--quiz-error-ink);
}

section.quiz .quiz-result-icon {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-top: 1px;
  border-radius: 50%;
  font-size: 26px;
  font-weight: 750;
  line-height: 1;
}

section.quiz .is-correct > .quiz-result-icon {
  background: var(--quiz-success-icon);
  color: var(--quiz-success);
  box-shadow: 0 0 0 1px var(--quiz-success-border);
}

section.quiz .is-incorrect > .quiz-result-icon {
  background: var(--surface, #ffffff);
  color: var(--quiz-error);
  font-size: 24px;
  box-shadow: 0 0 0 1px var(--quiz-error-border);
}

section.quiz .quiz-result-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}

section.quiz .quiz-result-copy > strong {
  display: block;
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0;
}

section.quiz .is-correct > .quiz-result-copy > strong { color: var(--quiz-success-ink); }
section.quiz .is-incorrect > .quiz-result-copy > strong { color: var(--quiz-error); }

section.quiz .quiz-result-copy > p {
  margin: 7px 0 0;
  color: inherit;
  font-size: 14px;
  line-height: 1.85;
  white-space: normal;
  overflow-wrap: anywhere;
}

section.quiz #quiz-continue,
section.quiz #check-quiz-button {
  min-height: 44px;
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
}

section.quiz #quiz-continue:not(:disabled) {
  background: var(--quiz-success);
  border-color: var(--quiz-success);
  color: var(--quiz-success-on);
  font-weight: 650;
  opacity: 1;
}

section.quiz #quiz-continue:not(:disabled):hover {
  background: var(--quiz-success-hover);
  border-color: var(--quiz-success-hover);
}

/* Confetti stays inside two narrow edge gutters, behind the icon and copy. */
section.quiz .quiz-confetti {
  position: absolute;
  z-index: 0;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
  pointer-events: none;
  user-select: none;
  contain: layout paint;
}

section.quiz .quiz-confetti > i {
  --confetti-x: 8px;
  --confetti-lift: -28px;
  --confetti-turn: 160deg;
  position: absolute;
  top: 39px;
  left: 6px;
  width: 4px;
  height: 7px;
  border-radius: 1px;
  background: var(--quiz-confetti-green);
  opacity: 0;
  pointer-events: none;
  animation: quiz-corner-confetti 1000ms cubic-bezier(.2, .6, .35, 1) 1 both;
}

section.quiz .quiz-confetti > i:nth-child(n+9) { left: auto; right: 6px; }
section.quiz .quiz-confetti > i:nth-child(1) { --confetti-x: 3px; --confetti-lift: -30px; --confetti-turn: 150deg; }
section.quiz .quiz-confetti > i:nth-child(2) { --confetti-x: 10px; --confetti-lift: -23px; --confetti-turn: -130deg; background: var(--quiz-confetti-gold); animation-delay: 40ms; }
section.quiz .quiz-confetti > i:nth-child(3) { --confetti-x: 5px; --confetti-lift: -35px; --confetti-turn: 230deg; background: var(--quiz-confetti-blue); animation-delay: 70ms; border-radius: 50%; height: 4px; }
section.quiz .quiz-confetti > i:nth-child(4) { --confetti-x: 13px; --confetti-lift: -29px; --confetti-turn: -200deg; background: var(--quiz-confetti-purple); animation-delay: 20ms; }
section.quiz .quiz-confetti > i:nth-child(5) { --confetti-x: 7px; --confetti-lift: -18px; --confetti-turn: 190deg; animation-delay: 90ms; }
section.quiz .quiz-confetti > i:nth-child(6) { --confetti-x: 1px; --confetti-lift: -26px; --confetti-turn: -110deg; background: var(--quiz-confetti-gold); animation-delay: 60ms; height: 5px; }
section.quiz .quiz-confetti > i:nth-child(7) { --confetti-x: 11px; --confetti-lift: -34px; --confetti-turn: 260deg; background: var(--quiz-confetti-blue); animation-delay: 10ms; }
section.quiz .quiz-confetti > i:nth-child(8) { --confetti-x: 4px; --confetti-lift: -21px; --confetti-turn: -170deg; background: var(--quiz-confetti-purple); animation-delay: 100ms; border-radius: 50%; height: 4px; }
section.quiz .quiz-confetti > i:nth-child(9) { --confetti-x: -4px; --confetti-lift: -32px; --confetti-turn: -150deg; }
section.quiz .quiz-confetti > i:nth-child(10) { --confetti-x: -12px; --confetti-lift: -24px; --confetti-turn: 130deg; background: var(--quiz-confetti-gold); animation-delay: 60ms; }
section.quiz .quiz-confetti > i:nth-child(11) { --confetti-x: -6px; --confetti-lift: -35px; --confetti-turn: -230deg; background: var(--quiz-confetti-blue); animation-delay: 30ms; border-radius: 50%; height: 4px; }
section.quiz .quiz-confetti > i:nth-child(12) { --confetti-x: -9px; --confetti-lift: -28px; --confetti-turn: 200deg; background: var(--quiz-confetti-purple); animation-delay: 80ms; }
section.quiz .quiz-confetti > i:nth-child(13) { --confetti-x: -2px; --confetti-lift: -20px; --confetti-turn: -190deg; animation-delay: 20ms; }
section.quiz .quiz-confetti > i:nth-child(14) { --confetti-x: -7px; --confetti-lift: -29px; --confetti-turn: 110deg; background: var(--quiz-confetti-gold); animation-delay: 100ms; height: 5px; }
section.quiz .quiz-confetti > i:nth-child(15) { --confetti-x: -13px; --confetti-lift: -33px; --confetti-turn: -260deg; background: var(--quiz-confetti-blue); animation-delay: 10ms; }
section.quiz .quiz-confetti > i:nth-child(16) { --confetti-x: -5px; --confetti-lift: -22px; --confetti-turn: 170deg; background: var(--quiz-confetti-purple); animation-delay: 70ms; border-radius: 50%; height: 4px; }

@keyframes quiz-corner-confetti {
  0% { opacity: 0; transform: translate(0, 4px) rotate(0deg) scale(.6); }
  12% { opacity: .95; }
  43% { opacity: .95; transform: translate(var(--confetti-x), var(--confetti-lift)) rotate(var(--confetti-turn)) scale(1); }
  76% { opacity: .65; }
  100% { opacity: 0; transform: translate(var(--confetti-x), 12px) rotate(calc(var(--confetti-turn) * 1.4)) scale(.7); }
}

@media (prefers-color-scheme: dark) {
  section.quiz {
    --quiz-success: #8be4a7;
    --quiz-success-hover: #aff2c3;
    --quiz-success-ink: #a6f0bd;
    --quiz-success-copy: #cfebd7;
    --quiz-success-option: #183a2b;
    --quiz-success-result: #17432e;
    --quiz-success-border: #459f68;
    --quiz-success-on: #103221;
    --quiz-success-icon: #123722;
    --quiz-error: #ffabb4;
    --quiz-error-ink: #efc2c8;
    --quiz-error-bg: #3d252c;
    --quiz-error-border: #a35b66;
    --quiz-confetti-green: #8be4a7;
    --quiz-confetti-gold: #f0ce77;
    --quiz-confetti-blue: #9fc8f0;
    --quiz-confetti-purple: #c2a3ee;
  }
}

@media (max-width: 600px) {
  section.quiz .quiz-options > label.quiz-option { gap: 9px; grid-template-columns: 18px minmax(0, 1fr) 24px; }
  section.quiz .quiz-option-mark { width: 24px; height: 24px; font-size: 16px; }
  section.quiz .quiz-feedback.is-correct,
  section.quiz .quiz-feedback.is-incorrect { grid-template-columns: 32px minmax(0, 1fr); padding: 17px 24px; gap: 11px; }
  section.quiz .quiz-result-icon { width: 32px; height: 32px; font-size: 21px; }
  section.quiz .quiz-result-copy > strong { font-size: 16px; }
  section.quiz .quiz-result-copy > p { font-size: 13px; line-height: 1.9; }
  section.quiz #quiz-continue,
  section.quiz #check-quiz-button { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  section.quiz .quiz-confetti { display: none !important; }
  section.quiz .quiz-confetti > i { animation: none !important; }
  section.quiz .quiz-option,
  section.quiz .quiz-option-mark,
  section.quiz .quiz-result-icon,
  section.quiz #quiz-continue,
  section.quiz #check-quiz-button { transition: none !important; }
}

@media (forced-colors: active) {
  section.quiz .quiz-option.is-correct,
  section.quiz .quiz-feedback.is-correct { border: 2px solid Highlight; }
  section.quiz .quiz-option-mark,
  section.quiz .quiz-result-icon { border: 1px solid currentColor; }
  section.quiz .quiz-confetti { display: none; }
}

/* Keep the HTML hidden state authoritative over shared button display rules. */
.quiz-footer [hidden] { display: none !important; }