:root {
  --academic-navy: #1a237e;
  --academic-navy-soft: #283593;
  --academic-bg: #f4f6fb;
  --academic-surface: #ffffff;
  --academic-line: #d7deea;
  --academic-text: #172033;
  --academic-muted: #5d6b82;
  --academic-reward: #2e7d32;
  --academic-reward-soft: #e8f5e9;
  --academic-reward-line: #2f6e35;
}

body {
  background: var(--academic-bg);
  color: var(--academic-text);
}

.cta-btn {
  background: var(--academic-navy);
}

.cta-btn:hover {
  filter: brightness(1.05);
}

.top-banner {
  background: linear-gradient(90deg, var(--academic-navy) 0%, var(--academic-navy-soft) 100%);
}

.exam-shell {
  background: #eef2f8;
  border: 1px solid var(--academic-line);
}

.exam-panel {
  background: var(--academic-surface);
  border: 1px solid var(--academic-line);
  box-shadow: 0 18px 42px -28px rgba(26, 35, 126, 0.28);
}

.exam-paper-head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--academic-line);
  border-radius: 1rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

#quiz-view .exam-paper-head {
  display: none !important;
}

.exam-paper-meta {
  display: grid;
  gap: 0.65rem;
}

.exam-meta-chip {
  border: 1px solid #d9e3f2;
  border-radius: 1rem;
  background: #fff;
  padding: 0.75rem 0.9rem;
}

.exam-meta-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--academic-muted);
}

.exam-meta-value {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--academic-text);
}

.exam-workspace {
  display: grid;
  gap: 1rem;
}

.exam-main-column {
  min-width: 0;
}

.exam-sidebar-column {
  min-width: 0;
}

.exam-sidebar-card {
  box-shadow: 0 14px 32px -28px rgba(15, 23, 42, 0.3);
}

.question-sheet-card {
  border: 1px solid var(--academic-line);
  border-radius: 1rem;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  padding: 1rem;
  box-shadow: 0 20px 34px -34px rgba(15, 23, 42, 0.35);
}

.question-paper-card {
  border: 1px solid #d7deea;
  border-radius: 1rem;
  background: #fff;
  padding: 1rem;
  box-shadow: 0 14px 26px -24px rgba(15, 23, 42, 0.2);
}

.question-paper-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}

.question-paper-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: #eff6ff;
  color: var(--academic-navy);
  padding: 0.35rem 0.7rem;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.exam-instructions {
  border-top: 1px solid var(--academic-line);
  padding-top: 0.9rem;
}

.exam-instructions ul {
  padding-left: 1rem;
}

.exam-instructions li {
  line-height: 1.5;
}

.exam-label {
  color: var(--academic-navy);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.timer-box {
  position: sticky;
  top: 76px;
  z-index: 20;
  background: #f8faff;
  border: 1px solid var(--academic-line);
  border-radius: 1rem;
  padding: 0.9rem 1rem;
  box-shadow: 0 12px 24px -22px rgba(26, 35, 126, 0.45);
}

#timer-display {
  min-width: 108px;
  text-align: center;
  padding: 0.65rem 0.85rem;
  background: var(--academic-navy);
  color: #fff;
  border-radius: 0.9rem;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.question-timer-wrap {
  min-width: 96px;
  text-align: center;
  padding: 0.45rem 0.65rem;
  background: #ffffff;
  border: 1px solid var(--academic-line);
  border-radius: 0.9rem;
  box-shadow: inset 0 0 0 1px rgba(26, 35, 126, 0.04);
}

.question-timer-label {
  display: block;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--academic-muted);
}

.question-timer-display {
  margin-top: 0.15rem;
  font-size: 1rem;
  font-weight: 900;
  color: var(--academic-navy);
}

.progress-shell {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: #dbe4f2;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--academic-navy) 0%, #3949ab 100%);
  transition: width 0.25s ease;
}

#question-text {
  color: var(--academic-text);
  line-height: 1.55;
}

#quiz-view select,
#quiz-view button,
#quiz-view a {
  box-shadow: none;
}

.explanation-box {
  background: var(--academic-reward-soft);
  border: 1px solid var(--academic-reward-line);
  border-left: 6px solid var(--academic-reward);
  border-radius: 1rem;
  padding: 1rem;
}

.explanation-item {
  background: #fff;
  border: 1px solid #cfe4d1;
  border-radius: 0.9rem;
  padding: 0.95rem 1rem;
}

.explanation-item.correct {
  border-color: #81c784;
}

.explanation-item.incorrect {
  border-color: #a5d6a7;
}

.explanation-answer {
  font-weight: 800;
  color: var(--academic-reward-line);
}

.explanation-meta {
  color: var(--academic-muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.academic-option {
  background: #fff;
  color: var(--academic-text);
  border: 1px solid #c6d0e1;
  font-weight: 700;
  border-radius: 1rem;
  text-align: left;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  box-shadow: 0 10px 18px -18px rgba(15, 23, 42, 0.35);
}

.academic-option:hover {
  border-color: var(--academic-navy-soft);
  background: #f7f9fe;
  transform: translateY(-1px);
  box-shadow: 0 14px 24px -18px rgba(26, 35, 126, 0.28);
}

.academic-option .option-marker {
  background: #e8edff;
  color: var(--academic-navy);
}

.academic-option.is-correct {
  background: #edf7ee;
  border-color: #2e7d32;
  color: #194d1c;
}

.academic-option.is-wrong {
  background: #fff4f4;
  border-color: #c62828;
  color: #7f1d1d;
}

.academic-completion-card {
  background: #fff;
  border: 1px solid var(--academic-line);
  border-radius: 1rem;
  padding: 1rem;
}

@media (max-width: 640px) {
  .timer-box {
    top: 66px;
    padding: 0.8rem;
  }

  #timer-display {
    width: 100%;
  }
}

@media (min-width: 1024px) {
  .exam-paper-head {
    grid-template-columns: minmax(0, 1fr) 320px;
    display: grid;
    align-items: start;
  }

  .exam-paper-meta {
    grid-template-columns: 1fr;
  }

  .exam-workspace {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }

  .exam-sidebar-column {
    position: sticky;
    top: 152px;
  }
}