/* ==========================================================================
   css/exam.css - Fullscreen Computer-Based Test (CBT) Screen Styling
   Conforms to OES Front-End Specification v2.1 (Section 4)
   ========================================================================== */

.cbt-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  background-color: var(--page-bg);
  box-sizing: border-box;
}

/* Exam Top Bar (56px) */
.exam-topbar {
  height: 56px;
  background-color: var(--topbar-bg);
  border-bottom: 1px solid var(--topbar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  z-index: 1000;
}

.exam-title-badge {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-tabs {
  display: flex;
  gap: 0.5rem;
}

.section-tab-btn {
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid var(--card-border);
  background: var(--page-bg);
  color: var(--text-secondary);
  cursor: pointer;
}

.section-tab-btn.active {
  background: var(--brand-primary);
  color: #FFFFFF;
  border-color: var(--brand-primary);
}

.exam-timer {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 6px;
  background: #EAF1FF;
  color: var(--brand-primary);
}

.exam-timer.timer-warning {
  background: var(--warning-bg);
  color: #8F5B00;
}

.exam-timer.timer-danger {
  background: var(--danger-bg);
  color: var(--danger);
  animation: pulse-danger 1s infinite;
}

@keyframes pulse-danger {
  0% { opacity: 1; }
  50% { opacity: 0.6; }
  100% { opacity: 1; }
}

/* Proctoring Strip (36px) */
.proctoring-strip {
  height: 36px;
  background-color: #082038;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  font-size: 0.75rem;
}

.proctoring-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.proctor-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #20B078;
}

.proctor-violations {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.violation-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
}

.violation-dot.amber { background: var(--warning); }
.violation-dot.red { background: var(--danger); }

/* Main CBT View: Split 70% Question, 30% Palette */
.cbt-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.question-panel {
  flex: 7;
  overflow-y: auto;
  padding: 1.5rem;
  border-inline-end: 1px solid var(--card-border);
  background-color: #FFFFFF;
}

.palette-panel {
  flex: 3;
  min-width: 300px;
  max-width: 380px;
  overflow-y: auto;
  padding: 1rem;
  background-color: var(--page-bg);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Question Header Chips */
.question-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
}

.q-number {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.q-chips {
  display: flex;
  gap: 0.5rem;
}

.chip-marks-pos {
  background: #E6F7EF;
  color: #082038;
  font-weight: 600;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.chip-marks-neg {
  background: #FDE9E5;
  color: #082038;
  font-weight: 600;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.question-stem {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

/* Option Cards (Section 4) */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.option-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  cursor: pointer;
  background: #FFFFFF;
  transition: all 0.15s ease;
}

.option-card:hover {
  border-color: var(--brand-primary);
  background: rgba(49, 106, 255, 0.02);
}

.option-card.selected {
  border: 2px solid var(--brand-primary) !important;
  background: #EAF1FF !important;
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--input-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.option-card.selected .option-letter {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #FFFFFF;
}

.option-text {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
}

/* Palette Legend & Tiles (Section 4 & Section 2.1) */
.palette-legend {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 0.75rem;
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--card-border);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.legend-badge {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  display: inline-block;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  max-height: 360px;
  overflow-y: auto;
  padding: 0.25rem;
}

.palette-tile {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  border: 1px solid transparent;
  cursor: pointer;
  position: relative;
  transition: transform 0.1s ease;
}

.palette-tile:hover {
  transform: scale(1.05);
}

.palette-tile.active-q {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

.palette-tile.answered {
  background-color: var(--exam-answered);
  color: var(--exam-text);
}

.palette-tile.not-answered {
  background-color: var(--exam-not-answered);
  color: #FFFFFF;
}

.palette-tile.not-visited {
  background-color: var(--exam-not-visited);
  color: var(--exam-text);
  border: 1px dashed #6B7A96;
}

.palette-tile.marked {
  background-color: var(--exam-marked);
  color: var(--exam-text);
}

.palette-tile.marked::after {
  content: "";
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #082038;
}

.palette-tile.answered-marked {
  background-color: var(--exam-marked);
  color: var(--exam-text);
}

.palette-tile.answered-marked::after {
  content: "";
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--exam-answered);
}

/* Exam Bottom Action Bar (64px) */
.exam-bottombar {
  height: 64px;
  background-color: var(--topbar-bg);
  border-top: 1px solid var(--topbar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  z-index: 1000;
}

.autosave-status {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Floating Modals for Calculator and Scratchpad */
.floating-tool-panel {
  position: fixed;
  top: 70px;
  right: 20px;
  width: 300px;
  background: #FFFFFF;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  z-index: 1100;
  display: none;
}

.floating-tool-panel.open {
  display: block;
}

.tool-header {
  padding: 0.75rem 1rem;
  background: var(--page-bg);
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}

.tool-body {
  padding: 1rem;
}

/* ==========================================================================
   Responsive CBT Mobile and Tablet Adaptations (Section 20)
   ========================================================================== */
@media (max-width: 991.98px) {
  .cbt-body {
    flex-direction: column;
    overflow-y: auto;
  }
  .question-panel {
    border-inline-end: none;
    border-bottom: 1px solid var(--card-border);
    padding: 1rem;
    flex: auto;
  }
  .palette-panel {
    min-width: 100%;
    max-width: 100%;
    flex: auto;
  }
  .exam-topbar {
    height: auto;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
  }
  .exam-bottombar {
    height: auto;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
  }
}

@media (max-width: 575.98px) {
  .palette-grid {
    grid-template-columns: repeat(5, 1fr);
  }
  .palette-tile {
    width: 40px;
    height: 40px;
    font-size: 0.75rem;
  }
  .q-chips {
    flex-wrap: wrap;
  }
  .floating-tool-panel {
    width: calc(100vw - 20px);
    right: 10px;
  }
}