/* Shringlish Computer-Based Testing (CBT) Exam Engine Stylesheet */
:root {
  --cbt-primary: #312e81;
  --cbt-primary-light: #4338ca;
  --cbt-accent: #f59e0b;
  --cbt-bg: #f8fafc;
  --cbt-card-bg: #ffffff;
  --cbt-text-main: #0f172a;
  --cbt-text-muted: #64748b;
  --cbt-border: #e2e8f0;
  --cbt-correct: #10b981;
  --cbt-incorrect: #ef4444;
  --cbt-flagged: #f59e0b;
  --cbt-radius: 12px;
  --cbt-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.08);
}

[data-theme="midnight"] {
  --cbt-primary: #6366f1;
  --cbt-primary-light: #818cf8;
  --cbt-bg: #0f172a;
  --cbt-card-bg: #1e293b;
  --cbt-text-main: #f8fafc;
  --cbt-text-muted: #94a3b8;
  --cbt-border: #334155;
}

[data-theme="warm"] {
  --cbt-primary: #1e1b4b;
  --cbt-primary-light: #3730a3;
  --cbt-bg: #faf9f6;
  --cbt-card-bg: #ffffff;
  --cbt-text-main: #18181b;
  --cbt-text-muted: #71717a;
  --cbt-border: #e4e4e7;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--cbt-bg);
  color: var(--cbt-text-main);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* CBT Top Exam Navigation Bar */
.cbt-top-bar {
  background: var(--cbt-primary);
  color: #ffffff;
  padding: 0.85rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.cbt-exam-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cbt-exam-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cbt-exam-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.cbt-timer-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 0, 0, 0.25);
  padding: 6px 14px;
  border-radius: 8px;
  font-family: monospace;
  font-size: 1.15rem;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.cbt-timer-wrap.warning {
  background: #dc2626;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.75; }
}

/* Main CBT Exam Layout Grid */
.cbt-container {
  max-width: 1280px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1.25rem;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1.5rem;
  flex: 1;
}

@media (max-width: 900px) {
  .cbt-container {
    grid-template-columns: 1fr;
  }
}

/* Question Area Card */
.cbt-main-card {
  background: var(--cbt-card-bg);
  border: 1px solid var(--cbt-border);
  border-radius: var(--cbt-radius);
  padding: 2rem;
  box-shadow: var(--cbt-shadow);
  display: flex;
  flex-direction: column;
}

.cbt-section-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #eef2ff;
  color: #4338ca;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 9999px;
  margin-bottom: 1rem;
  align-self: flex-start;
}

[data-theme="midnight"] .cbt-section-pill {
  background: #312e81;
  color: #c7d2fe;
}

/* Audio Player Section for Listening Questions */
.cbt-audio-panel {
  background: #f1f5f9;
  border: 1px solid var(--cbt-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

[data-theme="midnight"] .cbt-audio-panel {
  background: #1e293b;
}

.cbt-audio-panel audio {
  width: 100%;
  border-radius: 6px;
}

.cbt-audio-notes {
  font-size: 0.825rem;
  color: var(--cbt-text-muted);
  display: flex;
  justify-content: space-between;
}

.cbt-question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--cbt-border);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
}

.cbt-q-num {
  font-weight: 800;
  font-size: 1rem;
  color: var(--cbt-primary-light);
}

.cbt-flag-btn {
  background: transparent;
  border: 1px solid var(--cbt-border);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--cbt-text-muted);
  transition: all 0.2s;
}

.cbt-flag-btn.flagged {
  background: #fef3c7;
  border-color: #f59e0b;
  color: #b45309;
  font-weight: 700;
}

.cbt-stem-text {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* MCQ Options */
.cbt-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.cbt-option-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 1rem 1.25rem;
  border: 2px solid var(--cbt-border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--cbt-card-bg);
  user-select: none;
}

.cbt-option-item:hover {
  border-color: var(--cbt-primary-light);
  background: rgba(99, 102, 241, 0.04);
}

.cbt-option-item.selected {
  border-color: var(--cbt-primary-light);
  background: rgba(99, 102, 241, 0.08);
  font-weight: 600;
}

.cbt-option-letter {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--cbt-bg);
  border: 1px solid var(--cbt-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.cbt-option-item.selected .cbt-option-letter {
  background: var(--cbt-primary-light);
  color: #ffffff;
  border-color: var(--cbt-primary-light);
}

/* Nav Action Buttons at Bottom */
.cbt-card-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--cbt-border);
}

.cbt-btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.cbt-btn-prev {
  background: var(--cbt-bg);
  color: var(--cbt-text-main);
  border: 1px solid var(--cbt-border);
}

.cbt-btn-next {
  background: var(--cbt-primary-light);
  color: #ffffff;
}

.cbt-btn-submit {
  background: #10b981;
  color: #ffffff;
}

.cbt-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Sidebar Navigator Grid */
.cbt-sidebar {
  background: var(--cbt-card-bg);
  border: 1px solid var(--cbt-border);
  border-radius: var(--cbt-radius);
  padding: 1.5rem;
  box-shadow: var(--cbt-shadow);
  display: flex;
  flex-direction: column;
  height: fit-content;
}

.cbt-nav-title {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cbt-legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 1.25rem;
  font-size: 0.75rem;
  color: var(--cbt-text-muted);
}

.cbt-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.cbt-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.cbt-legend-dot.answered { background: var(--cbt-primary-light); }
.cbt-legend-dot.flagged { background: var(--cbt-flagged); }
.cbt-legend-dot.unvisited { background: var(--cbt-border); }

.cbt-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 1.5rem;
}

.cbt-grid-cell {
  aspect-ratio: 1;
  border-radius: 6px;
  border: 1px solid var(--cbt-border);
  background: var(--cbt-bg);
  color: var(--cbt-text-main);
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all 0.15s;
}

.cbt-grid-cell.active {
  outline: 2px solid var(--cbt-primary-light);
  outline-offset: 2px;
}

.cbt-grid-cell.answered {
  background: var(--cbt-primary-light);
  color: #ffffff;
  border-color: var(--cbt-primary-light);
}

.cbt-grid-cell.flagged::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cbt-flagged);
}

/* Results & Diagnostic Score Card Modal / View */
.cbt-results-card {
  background: var(--cbt-card-bg);
  border: 1px solid var(--cbt-border);
  border-radius: var(--cbt-radius);
  padding: 2.5rem;
  box-shadow: var(--cbt-shadow);
  max-width: 960px;
  margin: 2rem auto;
}

.cbt-score-banner {
  text-align: center;
  padding: 2rem;
  border-radius: var(--cbt-radius);
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  color: #ffffff;
  margin-bottom: 2rem;
}

.cbt-score-big {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1;
  margin: 0.5rem 0;
  color: #38bdf8;
}

.cbt-breakdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.cbt-breakdown-card {
  padding: 1.25rem;
  border: 1px solid var(--cbt-border);
  border-radius: 8px;
  background: var(--cbt-bg);
}

.cbt-review-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cbt-review-item {
  border: 1px solid var(--cbt-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  background: var(--cbt-card-bg);
}

.cbt-review-item.correct {
  border-left: 5px solid var(--cbt-correct);
}

.cbt-review-item.incorrect {
  border-left: 5px solid var(--cbt-incorrect);
}