/* ============================================================
   INNOVEDU CENTER COMPETITION SITE - EXAM ROOM STYLES
   ============================================================ */

.exam-viewport {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background-color: #f8fafc;
}

/* Exam Sticky Header */
.exam-header {
  background-color: #ffffff;
  border-bottom: 2px solid var(--border);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  flex-shrink: 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.exam-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.exam-title-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.participant-tag {
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-surface-alt);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* Timer Display */
.exam-timer-box {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background-color: #f1f5f9;
  border: 1px solid var(--border-strong);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-main);
  transition: all 0.3s ease;
}

.exam-timer-box.timer-warning {
  background-color: #fef2f2;
  border-color: #f87171;
  color: #dc2626;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

.exam-status-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.autosave-indicator {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--success);
  font-weight: 500;
}

.autosave-dot {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
  animation: blink 2s infinite ease-in-out;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Anti-Cheat Alert Banner */
.cheat-alert-banner {
  background: #dc2626;
  color: white;
  padding: 0.5rem 1.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 6px rgba(220, 38, 38, 0.2);
}

/* Main Exam Workspace Layout */
.exam-main {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.exam-content-area {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Dual-Pane Split-Screen View (for Reading Comprehension) */
.split-screen-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  height: 100%;
  min-height: 520px;
}

.passage-pane {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  overflow-y: auto;
  box-shadow: var(--shadow-sm);
  line-height: 1.75;
}

.passage-pane h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--primary-dark);
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 0.4rem;
}

.passage-pane p {
  margin-bottom: 1rem;
  color: #334155;
  font-size: 0.975rem;
}

.questions-pane {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Audio Player Section (English Listening Tests) */
.listening-audio-card {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 8px 16px rgba(15, 23, 42, 0.15);
  margin-bottom: 1.25rem;
  border: 1px solid #334155;
}

.audio-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.audio-title-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.audio-play-limit-tag {
  background: rgba(255, 255, 255, 0.15);
  color: #93c5fd;
  font-size: 0.8rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.audio-controls-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.audio-btn-play {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #3b82f6;
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: transform 0.15s, background-color 0.15s;
  flex-shrink: 0;
}

.audio-btn-play:hover:not(:disabled) {
  background: #2563eb;
  transform: scale(1.05);
}

.audio-btn-play:disabled {
  background: #475569;
  cursor: not-allowed;
  opacity: 0.6;
}

.audio-progress-track {
  flex: 1;
  background: #334155;
  height: 8px;
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  cursor: not-allowed; /* scrubbing prevented for test fairness */
}

.audio-progress-bar {
  background: #60a5fa;
  height: 100%;
  width: 0%;
  transition: width 0.1s linear;
}

.audio-timer-stamp {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #cbd5e1;
  min-width: 80px;
  text-align: right;
}

.audio-notice {
  font-size: 0.75rem;
  color: #94a3b8;
  margin-top: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Question Content Card */
.question-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.question-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.question-num-tag {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary-dark);
}

.question-points-tag {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.question-prompt {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* Math & Science Formula Rendering */
.formula-block {
  background: var(--bg-surface-alt);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin: 1rem 0;
  border-left: 4px solid var(--primary);
  overflow-x: auto;
}

/* Diagram Viewer */
.diagram-container {
  margin: 1.25rem 0;
  text-align: center;
}

.diagram-image {
  max-width: 100%;
  max-height: 350px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  cursor: zoom-in;
  transition: transform 0.2s ease;
}

.diagram-image:hover {
  transform: scale(1.01);
}

/* Multiple Choice Options */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.9rem 1.15rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  background: #ffffff;
}

.option-item:hover {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.option-item.selected {
  border-color: var(--primary);
  background-color: #eff6ff;
  box-shadow: 0 0 0 1px var(--primary);
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
  color: var(--text-muted);
  background: #ffffff;
}

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

.option-text {
  font-size: 0.975rem;
  color: var(--text-main);
  padding-top: 2px;
  flex: 1;
}

/* Written / Numerical Input */
.answer-input-box {
  margin-top: 1rem;
}

.numerical-input-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 320px;
}

.numerical-input {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  padding: 0.65rem 0.9rem;
}

.essay-word-counter {
  display: flex;
  justify-content: flex-end;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* Question Navigation Sidebar / Drawer */
.exam-sidebar {
  width: 280px;
  background: #ffffff;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.legend-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.legend-dot.answered { background: var(--primary); }
.legend-dot.unanswered { background: #ffffff; border: 1.5px solid var(--border-strong); }
.legend-dot.flagged { background: var(--accent); }
.legend-dot.current { border: 2px solid #000; }

.question-grid {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  align-content: start;
}

.grid-btn {
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: #ffffff;
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  position: relative;
  transition: all 0.15s;
}

.grid-btn:hover {
  border-color: var(--primary);
  background: var(--bg-surface-alt);
}

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

.grid-btn.current {
  outline: 2px solid #0f172a;
  outline-offset: 1px;
}

.grid-btn.flagged::after {
  content: "";
  position: absolute;
  top: 2px;
  right: 2px;
  width: 8px;
  height: 8px;
  background-color: var(--accent);
  border-radius: 50%;
}

/* Exam Footer Actions */
.exam-footer {
  background: #ffffff;
  border-top: 1px solid var(--border);
  height: 68px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.nav-buttons-group {
  display: flex;
  gap: 0.75rem;
}