.quiz-workbench {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 4.5rem);
  align-items: start;
}

.quiz-intro {
  grid-column: 1 / span 5;
  position: sticky;
  inset-block-start: 2rem;
}

.quiz-kicker,
.result-label {
  margin: 0 0 1rem;
  color: var(--orange-dark);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.quiz-intro h1 {
  max-width: 9ch;
  margin: 0;
  font-size: clamp(3.5rem, 7.2vw, 7rem);
  font-weight: 790;
  letter-spacing: -0.075em;
  line-height: 0.83;
}

.quiz-intro h1 span {
  color: var(--cobalt);
}

.quiz-intro > p:last-child {
  max-width: 42ch;
  margin-block-start: 2rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.quiz-panel {
  position: relative;
  grid-column: 6 / -1;
  min-width: 0;
  min-height: 31rem;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  border: 1px solid var(--ink);
  background: var(--surface);
  box-shadow: 0.65rem 0.65rem 0 var(--ink);
}

.quiz-panel::before,
.quiz-panel::after {
  content: "";
  position: absolute;
  z-index: 2;
  background: var(--orange);
  pointer-events: none;
}

.quiz-panel::before {
  inset: -0.7rem 0 auto auto;
  width: 1.4rem;
  height: 1px;
}

.quiz-panel::after {
  inset: -1.4rem 0 auto auto;
  width: 1px;
  height: 1.4rem;
}

.quiz-panel-register,
.quiz-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.quiz-panel-register {
  padding-block-end: 0.8rem;
  border-block-end: 1px solid var(--rule);
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.62rem;
}

.quiz-panel-register span:first-child {
  color: var(--orange-dark);
  font-weight: 600;
}

.quiz-loading {
  display: grid;
  place-items: center;
  min-height: 24rem;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
}

.loading-mark {
  width: 2rem;
  height: 2rem;
  border: 2px solid var(--rule);
  border-block-start-color: var(--cobalt);
  border-radius: 50%;
  animation: lab-spin 800ms linear infinite;
}

@keyframes lab-spin {
  to { transform: rotate(360deg); }
}

.quiz-interface {
  padding-block-start: clamp(1.5rem, 3vw, 2.5rem);
}

.quiz-title {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1.35rem, 2vw, 1.8rem);
  letter-spacing: -0.03em;
}

.question-count {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
}

.progress-container {
  height: 0.38rem;
  margin-block: 1.25rem 2rem;
  overflow: hidden;
  border: 1px solid var(--rule);
  background: var(--canvas);
}

.progress-bar {
  width: 0;
  height: 100%;
  background: var(--cobalt);
  transform-origin: left;
  transition: width 320ms cubic-bezier(0.22, 1, 0.36, 1);
}

.question-container {
  animation: question-in 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

.question-container.is-entering {
  animation: question-in 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes question-in {
  from { opacity: 0; transform: translateX(0.75rem); }
  to { opacity: 1; transform: translateX(0); }
}

.question-text {
  max-width: 30ch;
  margin: 0 0 1.5rem;
  color: var(--ink);
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.options-grid {
  display: grid;
  gap: 0;
  border-block-start: 1px solid var(--rule);
}

.option-btn {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  width: 100%;
  min-height: 3.75rem;
  padding: 0.9rem 0.75rem;
  border: 0;
  border-block-end: 1px solid var(--rule);
  background: transparent;
  color: var(--ink);
  font-weight: 580;
  text-align: start;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, padding-inline 160ms ease;
}

.option-btn::after {
  content: "SELECT";
  align-self: center;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.58rem;
  letter-spacing: 0.08em;
}

.option-btn:hover:not(:disabled) {
  padding-inline: 1rem 0.5rem;
  background: var(--pale-blue);
  color: var(--cobalt-pressed);
}

.option-btn:disabled {
  cursor: default;
}

.option-btn.correct {
  background: #e5f5ed;
  color: var(--success);
}

.option-btn.correct::after {
  content: "CORRECT ✓";
  color: var(--success);
}

.option-btn.incorrect {
  background: #fff0ec;
  color: var(--danger);
}

.option-btn.incorrect::after {
  content: "NOT THIS ×";
  color: var(--danger);
}

.feedback-area {
  display: flex;
  justify-content: flex-end;
  min-height: 3rem;
  margin-block-start: 1.5rem;
}

.quiz-feedback {
  min-height: 1.5rem;
  margin: 0;
  color: var(--ink);
  font-weight: 650;
}

.next-btn {
  display: none;
}

.result-container {
  display: none;
  min-height: 28rem;
  padding-block-start: clamp(2rem, 5vw, 4rem);
}

.score-stamp {
  display: grid;
  place-items: center;
  width: clamp(7rem, 16vw, 9.5rem);
  aspect-ratio: 1;
  margin-block: 1rem 2rem;
  border: 2px solid var(--cobalt);
  color: var(--cobalt);
  font-family: "IBM Plex Mono", monospace;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 600;
  transform: rotate(-2deg);
}

.result-message {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.05em;
}

.result-sub {
  color: var(--muted);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-block-start: 2rem;
}

.floating-67 {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  color: var(--orange);
  font-family: "IBM Plex Mono", monospace;
  font-size: 7rem;
  font-weight: 600;
  opacity: 0;
  animation: float-register 1.6s ease-out forwards;
}

@keyframes float-register {
  0% { opacity: 0; transform: translate(-50%, 30%) rotate(-4deg); }
  20% { opacity: 1; transform: translate(-50%, 0) rotate(2deg); }
  100% { opacity: 0; transform: translate(-50%, -140%) rotate(-3deg); }
}

@media (max-width: 780px) {
  .quiz-workbench {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .quiz-intro,
  .quiz-panel {
    grid-column: 1 / -1;
  }

  .quiz-intro {
    position: static;
  }

  .quiz-intro h1 {
    max-width: 10ch;
  }
}

@media (max-width: 460px) {
  .quiz-intro h1 {
    font-size: clamp(3.15rem, 16vw, 5rem);
  }

  .quiz-panel {
    padding: 1rem;
    box-shadow: 0.4rem 0.4rem 0 var(--ink);
  }

  .quiz-panel-register,
  .quiz-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  .option-btn {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .result-actions {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .loading-mark {
    animation: none;
    border-color: var(--cobalt);
  }

  .floating-67 {
    display: none;
  }
}