/* ==========================================================================
   Oracle Certification Exam Simulator - Unified Responsive CSS Stylesheet
   Desktop & Mobile Optimized Layout
   ========================================================================== */

:root {
  --oracle-red: #C74634;
  --oracle-red-hover: #A83626;
  --oracle-dark: #161513;
  --header-bg: #111827;
  --bg-workspace: #F3F4F6;
  --card-bg: #FFFFFF;
  --border-color: #E5E7EB;
  --border-active: #3B82F6;
  --text-main: #1F2937;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-success-border: #A7F3D0;
  
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  
  --color-danger: #EF4444;
  --color-danger-bg: #FEF2F2;
  
  --terminal-bg: #1E293B;
  --terminal-text: #F8FAFC;
  
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  
  --font-scale: 1rem;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: var(--font-base);
  background-color: var(--bg-workspace);
  color: var(--text-main);
  user-select: text;
  -webkit-user-select: text;
}

body {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-height: 100vh;
  width: 100%;
  overflow: hidden;
}

/* ==========================================================================
   1. AUTHENTICATION GATEWAY SCREEN
   ========================================================================== */
.auth-wrapper {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top, #1E293B 0%, #0F172A 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
  overflow-y: auto;
}

.auth-card {
  background: #FFFFFF;
  border-radius: 12px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  margin: auto;
}

.auth-header {
  background: #111827;
  color: #FFFFFF;
  padding: 1.5rem 1.5rem 1.25rem;
  text-align: center;
  border-bottom: 2px solid var(--oracle-red);
}

.auth-header .ezem-logo,
.auth-header .oracle-logo {
  margin-bottom: 0.5rem;
}

.auth-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.auth-subtitle {
  font-size: 0.8rem;
  color: #9CA3AF;
  letter-spacing: 0.02em;
}

.auth-tabs {
  display: flex;
  background: #F1F5F9;
  padding: 4px;
  margin: 1.25rem 1.25rem 0.5rem;
  border-radius: 8px;
}

.auth-tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #64748B;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.auth-tab-btn.active {
  background: #FFFFFF;
  color: #0F172A;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.auth-form {
  padding: 1rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: #334155;
}

.form-input {
  padding: 0.65rem 0.85rem;
  border: 1.5px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  border-color: #2563EB;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-hint {
  font-size: 0.72rem;
  color: #64748B;
}

.form-error {
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #DC2626;
  padding: 0.55rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
}

.btn-auth {
  background: #1E293B;
  color: #FFFFFF;
  padding: 0.75rem;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin-top: 0.5rem;
}

.btn-auth:hover {
  background: #0F172A;
}

.auth-footer {
  text-align: center;
  padding: 0.85rem;
  background: #F8FAFC;
  border-top: 1px solid var(--border-color);
  font-size: 0.72rem;
  color: #94A3B8;
}

/* ==========================================================================
   2. DESKTOP HEADER & TOP CONTROLS
   ========================================================================== */
.exam-header {
  background-color: var(--header-bg);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.5rem;
  border-bottom: 2px solid var(--oracle-red);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
  z-index: 30;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.ezem-logo,
.oracle-logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo-accent {
  color: #38BDF8;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  font-family: var(--font-base);
}

.logo-pro {
  color: #F59E0B;
  font-weight: 800;
  margin-left: 1px;
}

.logo-red {
  color: var(--oracle-red);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.logo-sub {
  color: #9CA3AF;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
  font-weight: 600;
}

.exam-title-badge {
  display: flex;
  flex-direction: column;
  border-left: 1px solid #374151;
  padding-left: 1rem;
}

.exam-code {
  font-size: 0.75rem;
  font-weight: 700;
  color: #60A5FA;
  letter-spacing: 0.05em;
}

.exam-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: #F3F4F6;
}

.header-center {
  display: flex;
  align-items: center;
}

.mode-toggle {
  background: #1F2937;
  padding: 3px;
  border-radius: 6px;
  display: flex;
  border: 1px solid #374151;
}

.mode-btn {
  background: transparent;
  border: none;
  color: #9CA3AF;
  padding: 0.35rem 0.85rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.mode-btn.active {
  background: #374151;
  color: #FFFFFF;
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.timer-box {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: #1F2937;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  border: 1px solid #374151;
  white-space: nowrap;
}

.timer-icon {
  font-size: 0.95rem;
}

.timer-label {
  font-size: 0.75rem;
  color: #9CA3AF;
}

.timer-digits {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: #34D399;
}

.timer-box.warning .timer-digits {
  color: #F87171;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.btn-tool {
  background: #1F2937;
  border: 1px solid #374151;
  color: #E5E7EB;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-tool:hover {
  background: #374151;
  color: #FFFFFF;
}

.flag-btn.flagged {
  background: #7F1D1D;
  border-color: #DC2626;
  color: #FECACA;
}

.active-toggle {
  background: #1E3A8A;
  border-color: #3B82F6;
  color: #DBEAFE;
}

/* User Menu & Avatar */
.user-menu-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-left: 1px solid #374151;
  padding-left: 0.75rem;
}

.btn-user {
  background: #1F2937;
  border: 1px solid #374151;
  color: #F8FAFC;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-user:hover {
  background: #374151;
}

.role-badge {
  font-size: 0.65rem;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  text-transform: uppercase;
}

.role-badge.admin {
  background: #DC2626;
  color: #FFFFFF;
}

.role-badge.user {
  background: #2563EB;
  color: #FFFFFF;
}

.btn-admin {
  background: #7C2D12;
  border: 1px solid #EA580C;
  color: #FFEDD5;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.btn-admin:hover {
  background: #9A3412;
}

.btn-logout {
  background: transparent;
  border: 1px solid #4B5563;
  color: #9CA3AF;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-logout:hover {
  background: #374151;
  color: #FFFFFF;
}

/* ==========================================================================
   3. SUB-TOOLBAR
   ========================================================================== */
.sub-toolbar {
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  z-index: 20;
}

.q-progress-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.q-num-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.progress-bar-wrap {
  width: 140px;
  height: 8px;
  background: #E5E7EB;
  border-radius: 4px;
  overflow: hidden;
  display: inline-block;
}

.progress-bar-fill {
  display: block;
  height: 100%;
  background: #2563EB;
  transition: width 0.3s ease;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mastery-pill {
  background: #FEF3C7;
  border: 1px solid #FCD34D;
  color: #92400E;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-text-size {
  background: #F3F4F6;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.btn-text-size:hover {
  background: #E5E7EB;
}

/* ==========================================================================
   4. MAIN WORKSPACE & SCROLLABLE CARD AREA
   ========================================================================== */
.exam-main {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 1.5rem 1.25rem 3rem;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  -webkit-overflow-scrolling: touch;
}

.question-container {
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  width: 100%;
  max-width: 920px;
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  font-size: var(--font-scale);
  margin: 0 auto;
}

.q-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #F3F4F6;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.meta-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.badge-single {
  background: #EFF6FF;
  color: #1D4ED8;
  border: 1px solid #BFDBFE;
}

.badge-multi {
  background: #FEF3C7;
  color: #B45309;
  border: 1px solid #FDE68A;
}

.badge-mastery {
  background: #ECFDF5;
  color: #065F46;
  border: 1px solid #A7F3D0;
  font-size: 0.7rem;
}

.badge-status {
  background: #F3F4F6;
  color: #4B5563;
}

.badge-status.answered {
  background: var(--color-success-bg);
  color: #065F46;
}

.question-text {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.5;
  color: #111827;
  white-space: pre-line;
  word-break: break-word;
}

/* Monospace Exhibit box */
.exhibit-wrapper {
  background: var(--terminal-bg);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid #334155;
}

.exhibit-header {
  background: #0F172A;
  padding: 0.4rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #334155;
}

.exhibit-title {
  color: #94A3B8;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-copy {
  background: #334155;
  border: none;
  color: #E2E8F0;
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  cursor: pointer;
}

.btn-copy:hover {
  background: #475569;
}

.exhibit-content {
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85em;
  line-height: 1.45;
  color: var(--terminal-text);
  overflow-x: auto;
  white-space: pre;
}

/* Options */
.options-instruction {
  font-size: 0.88em;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.85rem 1.1rem;
  background: #FFFFFF;
  border: 1.5px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 48px;
}

.option-item:hover {
  background: #F9FAFB;
  border-color: #93C5FD;
}

.option-item.selected {
  background: #EFF6FF;
  border-color: #3B82F6;
  box-shadow: 0 0 0 1px #3B82F6;
}

.option-item.show-correct {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  box-shadow: 0 0 0 1px var(--color-success);
}

.option-item.show-incorrect {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
}

.option-input {
  margin-top: 0.2rem;
  width: 18px;
  height: 18px;
  accent-color: #2563EB;
  cursor: pointer;
  flex-shrink: 0;
}

.opt-letter-badge {
  font-weight: 700;
  font-size: 0.95em;
  color: #4B5563;
  min-width: 24px;
  flex-shrink: 0;
}

.option-item.selected .opt-letter-badge {
  color: #1D4ED8;
}

.opt-text {
  flex: 1;
  font-size: 0.95em;
  line-height: 1.45;
  color: #1F2937;
  word-break: break-word;
  white-space: pre-line;
}

/* Explanation panel */
.explanation-panel {
  background: #F8FAFC;
  border: 1px solid #CBD5E1;
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-top: 0.5rem;
}

.explanation-panel.correct {
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
}

.explanation-panel.incorrect {
  background: var(--color-danger-bg);
  border-color: #FECACA;
}

.expl-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.explanation-panel.correct .expl-header {
  color: #065F46;
}

.explanation-panel.incorrect .expl-header {
  color: #991B1B;
}

.expl-body {
  font-size: 0.88em;
  line-height: 1.5;
  color: #334155;
}

/* ==========================================================================
   5. DESKTOP FOOTER BAR
   ========================================================================== */
.exam-footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 30;
  flex-shrink: 0;
  box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.04);
}

.footer-left, .footer-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  padding: 0.55rem 1.2rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

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

.btn-secondary {
  background: #F3F4F6;
  color: #374151;
  border: 1px solid #D1D5DB;
}

.btn-secondary:hover:not(:disabled) {
  background: #E5E7EB;
}

.btn-nav {
  background: #2563EB;
  color: #FFFFFF;
}

.btn-nav:hover:not(:disabled) {
  background: #1D4ED8;
}

.btn-primary {
  background: #059669;
  color: #FFFFFF;
}

.btn-primary:hover:not(:disabled) {
  background: #047857;
}

.btn-finish {
  background: var(--oracle-red);
  color: #FFFFFF;
}

.btn-finish:hover:not(:disabled) {
  background: var(--oracle-red-hover);
}

/* ==========================================================================
   6. MODALS (REVIEW SCREEN, RESULTS, PROFILE, ADMIN)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-card {
  background: #FFFFFF;
  border-radius: 8px;
  width: 100%;
  max-width: 800px;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.modal-header {
  background: #1E293B;
  color: #FFFFFF;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.btn-close {
  background: transparent;
  border: none;
  color: #94A3B8;
  font-size: 1.1rem;
  cursor: pointer;
}

.btn-close:hover {
  color: #FFFFFF;
}

.modal-summary-stats {
  display: flex;
  gap: 1.5rem;
  padding: 0.75rem 1.25rem;
  background: #F8FAFC;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot-answered { background: #10B981; }
.dot-unanswered { background: #CBD5E1; }
.dot-flagged { background: #EF4444; }

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.questions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
  gap: 0.6rem;
}

.grid-q-btn {
  height: 48px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: #F8FAFC;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: all 0.15s ease;
}

.grid-q-btn:hover {
  border-color: #3B82F6;
  background: #EFF6FF;
}

.grid-q-btn.current {
  outline: 2px solid #2563EB;
  outline-offset: 1px;
}

.grid-q-btn.answered {
  background: #ECFDF5;
  border-color: #A7F3D0;
  color: #065F46;
}

.grid-q-btn.flagged::after {
  content: '🚩';
  position: absolute;
  top: 1px;
  right: 2px;
  font-size: 0.65rem;
}

.modal-footer {
  padding: 0.85rem 1.25rem;
  background: #F8FAFC;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* User Profile Modal */
.modal-profile {
  max-width: 650px;
}

.profile-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.profile-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}

.stat-box {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.25rem;
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0F172A;
}

.stat-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748B;
  text-transform: uppercase;
}

.history-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1E293B;
  margin-top: 0.5rem;
}

.attempts-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 220px;
  overflow-y: auto;
}

.attempt-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.85rem;
}

.attempt-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.att-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
}

.att-badge.pass { background: #DCFCE7; color: #15803D; }
.att-badge.fail { background: #FEE2E2; color: #B91C1C; }

.empty-state {
  color: #94A3B8;
  font-size: 0.85rem;
  text-align: center;
  padding: 1.5rem 0;
}

/* Admin Modal */
.modal-admin {
  max-width: 920px;
}

.admin-header-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.admin-badge {
  background: #EA580C;
  color: #FFFFFF;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  text-transform: uppercase;
}

.admin-body {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.admin-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}

.metric-card {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.m-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: #0F172A;
}

.m-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: #64748B;
  text-transform: uppercase;
}

.table-section-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1E293B;
}

.table-wrapper {
  max-height: 320px;
  overflow-x: auto;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  text-align: left;
  min-width: 600px;
}

.admin-table th {
  background: #F1F5F9;
  padding: 0.65rem 0.85rem;
  font-weight: 700;
  color: #334155;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
}

.admin-table td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid #F1F5F9;
  color: #1E293B;
}

.admin-table tr:hover {
  background: #F8FAFC;
}

/* Results screen modal */
.modal-results {
  max-width: 600px;
}

.results-content {
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.score-circle-wrap {
  display: flex;
  justify-content: center;
}

.score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.score-circle.pass {
  background: #ECFDF5;
  border: 5px solid #10B981;
  color: #065F46;
}

.score-circle.fail {
  background: #FEF2F2;
  border: 5px solid #EF4444;
  color: #991B1B;
}

.score-percentage {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
}

.score-status {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.score-details-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  width: 100%;
}

.score-card {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sc-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 600;
}

.sc-val {
  font-size: 1.1rem;
  font-weight: 700;
  color: #111827;
}

.sc-badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 700;
  width: fit-content;
}

.sc-badge.pass {
  background: #D1FAE5;
  color: #065F46;
}

.sc-badge.fail {
  background: #FEE2E2;
  color: #991B1B;
}

.results-actions {
  display: flex;
  gap: 1rem;
  width: 100%;
  justify-content: center;
}

/* Helpers */
.hidden {
  display: none !important;
}

/* ==========================================================================
   7. 📱 MOBILE RESPONSIVE ADAPTATIONS (< 768px)
   ========================================================================== */
@media (max-width: 768px) {
  body {
    height: 100%;
    overflow: hidden;
  }

  #app {
    height: 100vh;
    height: 100dvh;
    max-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  .exam-header {
    padding: 0.5rem 0.75rem;
    flex-direction: column;
    gap: 0.4rem;
    align-items: stretch;
    flex-shrink: 0;
  }

  .header-left {
    justify-content: space-between;
    width: 100%;
  }

  .exam-title-badge {
    border-left: none;
    padding-left: 0;
    text-align: right;
  }

  .exam-name {
    display: none;
  }

  .header-center {
    width: 100%;
  }

  .mode-toggle {
    width: 100%;
  }

  .mode-btn {
    flex: 1;
    text-align: center;
    padding: 0.4rem 0.5rem;
    font-size: 0.8rem;
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .timer-box {
    flex: 1;
    justify-content: center;
    padding: 0.3rem 0.5rem;
  }

  .flag-btn {
    flex: 1;
    justify-content: center;
  }

  .user-menu-wrap {
    width: 100%;
    border-left: none;
    padding-left: 0;
    justify-content: space-between;
    border-top: 1px solid #374151;
    padding-top: 0.4rem;
  }

  .btn-user {
    flex: 1;
  }

  .sub-toolbar {
    padding: 0.4rem 0.75rem;
    flex-wrap: wrap;
    gap: 0.35rem;
    flex-shrink: 0;
  }

  .q-progress-info {
    width: 100%;
    justify-content: space-between;
  }

  .progress-bar-wrap {
    flex: 1;
    max-width: 160px;
  }

  .toolbar-actions {
    width: 100%;
    justify-content: space-between;
  }

  .btn-text-size {
    display: none;
  }

  .exam-main {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding: 0.75rem 0.75rem 1.5rem;
    -webkit-overflow-scrolling: touch;
  }

  .question-container {
    padding: 0.85rem;
    border-radius: 8px;
    gap: 0.75rem;
    max-width: 100%;
  }

  .question-text {
    font-size: 0.98rem;
  }

  .option-item {
    padding: 0.65rem 0.75rem;
    gap: 0.55rem;
    min-height: 44px;
  }

  .exam-footer {
    flex-shrink: 0;
    background: #FFFFFF;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
    padding: 0.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    z-index: 50;
  }

  .footer-right {
    width: 100%;
    display: flex;
    gap: 0.5rem;
  }

  .btn-nav {
    flex: 1;
    justify-content: center;
    padding: 0.65rem;
  }

  .footer-left {
    width: 100%;
    display: flex;
    justify-content: space-between;
    gap: 0.4rem;
  }

  .footer-left .btn, .footer-right .btn-finish {
    flex: 1;
    justify-content: center;
    padding: 0.5rem 0.35rem;
    font-size: 0.78rem;
  }

  .footer-center {
    width: 100%;
  }

  .btn-check {
    width: 100%;
    justify-content: center;
    padding: 0.65rem;
  }

  .modal-card {
    width: 96%;
    max-height: 90vh;
  }

  .questions-grid {
    grid-template-columns: repeat(auto-fill, minmax(46px, 1fr));
    gap: 0.4rem;
  }

  .grid-q-btn {
    height: 42px;
    font-size: 0.8rem;
  }

  .profile-stats-grid, .admin-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }
}