/* ============================================================
   Material Design 3 — Design Tokens & Styles
   ============================================================ */

/* --- Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* --- MD3 Light Theme Tokens --- */
:root {
  --md-primary: #2B5BD2;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #E0E2FF;
  --md-on-primary-container: #001340;

  --md-secondary: #5B5D72;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #E0E1F9;
  --md-on-secondary-container: #181A2C;

  --md-tertiary: #77536D;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #FFD7F3;
  --md-on-tertiary-container: #2D1228;

  --md-error: #BA1A1A;
  --md-on-error: #FFFFFF;
  --md-error-container: #FFDAD6;
  --md-on-error-container: #410002;

  --md-success: #0F8643;
  --md-success-container: #D0F0DB;
  --md-on-success-container: #00210B;

  --md-warning: #855300;
  --md-warning-container: #FFE0B6;
  --md-on-warning-container: #2A1800;

  --md-surface: #F9F9FC;
  --md-on-surface: #1B1B1F;
  --md-surface-variant: #E2E2EC;
  --md-on-surface-variant: #45464F;
  --md-surface-container-low: #F3F3F7;
  --md-surface-container: #EDEDF2;
  --md-surface-container-high: #E7E7EC;
  --md-surface-container-highest: #DFDFE5;

  --md-outline: #757680;
  --md-outline-variant: #C5C6D0;
  --md-outline-light: #E2E2EC;

  --md-elevation-1: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
  --md-elevation-2: 0 3px 6px rgba(0, 0, 0, 0.06), 0 3px 6px rgba(0, 0, 0, 0.1);
  --md-elevation-3: 0 10px 20px rgba(0, 0, 0, 0.08), 0 6px 6px rgba(0, 0, 0, 0.12);

  --md-radius-xs: 6px;
  --md-radius-sm: 10px;
  --md-radius-md: 14px;
  --md-radius-lg: 18px;
  --md-radius-xl: 28px;
  --md-radius-full: 9999px;

  --md-transition: 280ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --md-transition-fast: 150ms cubic-bezier(0.2, 0, 0, 1);
}

/* --- Dark Theme --- */
@media (prefers-color-scheme: dark) {
  :root {
    --md-primary: #BEC2FF;
    --md-on-primary: #00297B;
    --md-primary-container: #003DAB;
    --md-on-primary-container: #E0E2FF;

    --md-secondary: #C4C5DD;
    --md-on-secondary: #2D2F42;
    --md-secondary-container: #434559;
    --md-on-secondary-container: #E0E1F9;

    --md-tertiary: #E5BAD8;
    --md-on-tertiary: #45263D;
    --md-tertiary-container: #5D3C54;
    --md-on-tertiary-container: #FFD7F3;

    --md-error: #FFB4AB;
    --md-on-error: #690005;
    --md-error-container: #93000A;
    --md-on-error-container: #FFDAD6;

    --md-success: #82D999;
    --md-success-container: #005324;
    --md-on-success-container: #D0F0DB;

    --md-warning: #FFB85F;
    --md-warning-container: #643D00;
    --md-on-warning-container: #FFE0B6;

    --md-surface: #121318;
    --md-on-surface: #E4E1E6;
    --md-surface-variant: #45464F;
    --md-on-surface-variant: #C5C6D0;
    --md-surface-container-low: #1A1B20;
    --md-surface-container: #1E1F25;
    --md-surface-container-high: #282A31;
    --md-surface-container-highest: #31333B;

    --md-outline: #8F909A;
    --md-outline-variant: #45464F;
    --md-outline-light: #2A2A31;

    --md-elevation-1: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.4);
    --md-elevation-2: 0 4px 8px rgba(0, 0, 0, 0.3), 0 3px 6px rgba(0, 0, 0, 0.4);
    --md-elevation-3: 0 12px 24px rgba(0, 0, 0, 0.35), 0 8px 12px rgba(0, 0, 0, 0.45);
  }
}

/* --- Base --- */
html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--md-on-surface);
  background: var(--md-surface);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(at 0% 0%, rgba(43, 91, 210, 0.04) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(119, 83, 109, 0.03) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(15, 134, 67, 0.02) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(219, 226, 255, 0.04) 0px, transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--md-transition);
}

@media (prefers-color-scheme: dark) {
  body {
    background-image: 
      radial-gradient(at 0% 0%, rgba(190, 194, 255, 0.02) 0px, transparent 50%),
      radial-gradient(at 100% 0%, rgba(229, 186, 216, 0.02) 0px, transparent 50%),
      radial-gradient(at 100% 100%, rgba(130, 217, 153, 0.01) 0px, transparent 50%),
      radial-gradient(at 0% 100%, rgba(0, 61, 171, 0.02) 0px, transparent 50%);
  }
}

#app {
  max-width: 1100px;
  margin: 0 auto;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: transparent;
}

/* ============================================================
   App Bar (Glassmorphic Top Bar)
   ============================================================ */
#app-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(249, 249, 252, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--md-outline-variant);
  flex-shrink: 0;
  transition: background-color var(--md-transition), border-color var(--md-transition);
}

@media (prefers-color-scheme: dark) {
  #app-bar {
    background: rgba(18, 19, 24, 0.8);
  }
}

#app-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--md-on-surface);
}

#app-bar-actions {
  display: flex;
  gap: 6px;
}

/* ============================================================
   Main Content
   ============================================================ */
#main-content {
  flex: 1;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.view {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

#view-quiz {
  overflow: hidden;
}

#view-banks,
#view-results,
#view-settings {
  overflow-y: auto;
}

.view.hidden {
  display: none !important;
}

/* ============================================================
   Icon Button
   ============================================================ */
.md3-icon-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--md-radius-full);
  border: none;
  background: transparent;
  color: var(--md-on-surface-variant);
  font-size: 1.25rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: background var(--md-transition-fast), color var(--md-transition-fast), transform var(--md-transition-fast);
  flex-shrink: 0;
}

.md3-icon-btn:hover {
  background: var(--md-surface-variant);
  color: var(--md-on-surface);
  transform: scale(1.05);
}

.md3-icon-btn:active {
  background: var(--md-outline-variant);
  transform: scale(0.95);
}

.md3-icon-btn svg {
  transition: transform var(--md-transition-fast);
}

.md3-icon-btn:hover svg {
  transform: scale(1.05);
}

/* ============================================================
   Buttons
   ============================================================ */
.md3-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--md-radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25;
  border: none;
  cursor: pointer;
  transition: background 250ms cubic-bezier(0.2, 0, 0, 1), 
              box-shadow 250ms cubic-bezier(0.2, 0, 0, 1), 
              transform 100ms cubic-bezier(0.2, 0, 0, 1),
              color 250ms cubic-bezier(0.2, 0, 0, 1);
  white-space: nowrap;
  user-select: none;
  position: relative;
}

.md3-btn:active {
  transform: scale(0.97);
}

.md3-btn.filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-elevation-1);
}

.md3-btn.filled:hover {
  background-image: linear-gradient(rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.08));
  box-shadow: var(--md-elevation-2);
}

.md3-btn.filled:active {
  background-image: linear-gradient(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.12));
  box-shadow: var(--md-elevation-1);
}

.md3-btn.tonal {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.md3-btn.tonal:hover {
  background-image: linear-gradient(rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.08));
  box-shadow: var(--md-elevation-1);
}

.md3-btn.tonal:active {
  background-image: linear-gradient(rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.08));
}

.md3-btn.outlined {
  background: transparent;
  color: var(--md-primary);
  border: 1.5px solid var(--md-outline);
}

.md3-btn.outlined:hover {
  background: rgba(43, 91, 210, 0.05);
  border-color: var(--md-primary);
}

.md3-btn.outlined:active {
  background: rgba(43, 91, 210, 0.12);
}

.md3-btn.text {
  background: transparent;
  color: var(--md-primary);
  padding-left: 16px;
  padding-right: 16px;
}

.md3-btn.text:hover {
  background: rgba(43, 91, 210, 0.05);
}

.md3-btn.text:active {
  background: rgba(43, 91, 210, 0.12);
}

.md3-btn:disabled {
  opacity: 0.38;
  pointer-events: none;
  box-shadow: none !important;
}

/* ============================================================
   Cards
   ============================================================ */
.md3-card {
  background: var(--md-surface-container-low);
  border-radius: var(--md-radius-lg);
  padding: 20px;
  border: 1px solid transparent;
  transition: box-shadow var(--md-transition), background-color var(--md-transition), border-color var(--md-transition);
}

.md3-card.elevated {
  box-shadow: var(--md-elevation-1);
}

.md3-card.elevated:hover {
  box-shadow: var(--md-elevation-2);
}

.md3-card.filled {
  background: var(--md-surface-container);
}

.md3-card.outlined {
  border: 1px solid var(--md-outline-variant);
  background: transparent;
}

/* ============================================================
   Chip (Modern Pill Style)
   ============================================================ */
.md3-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--md-radius-full);
  border: 1px solid var(--md-outline);
  background: transparent;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  user-select: none;
  transition: all 200ms cubic-bezier(0.2, 0, 0, 1);
}

.md3-chip:hover {
  background: rgba(117, 118, 128, 0.08);
  border-color: var(--md-outline);
  transform: translateY(-1px);
}

.md3-chip:active {
  transform: translateY(0);
}

.md3-chip.active {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
  box-shadow: var(--md-elevation-1);
}

.md3-chip.active:hover {
  background: var(--md-secondary-container);
  background-image: linear-gradient(rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.05));
}

/* ============================================================
   Progress Bar & Info
   ============================================================ */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--md-surface-container-high);
  border-radius: var(--md-radius-full);
  overflow: hidden;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--md-primary), #5B84FA);
  border-radius: var(--md-radius-full);
  transition: width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
  margin-top: 6px;
}

/* ============================================================
   Home Screen (Dashboard Style UI)
   ============================================================ */
.home-container {
  width: 100%;
  max-width: 768px;
  margin: 0 auto;
  padding: 24px 16px;
  box-sizing: border-box;
  transition: max-width var(--md-transition);
}

.home-grid-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  box-sizing: border-box;
}


.home-section {
  margin-bottom: 20px;
  background: var(--md-surface-container-low);
  padding: 18px 20px;
  border-radius: var(--md-radius-md);
  border: 1px solid var(--md-outline-variant);
  transition: all var(--md-transition);
}

.home-section:hover {
  background: var(--md-surface-container);
  border-color: var(--md-outline);
}

.home-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--md-primary);
  margin-bottom: 12px;
}

.home-select {
  width: 100%;
  padding: 14px 18px;
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  font-weight: 600;
  color: var(--md-on-surface);
  background: var(--md-surface-container-low);
  cursor: pointer;
  outline: none;
  transition: all var(--md-transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23757680' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 18px center;
  padding-right: 48px;
}

.home-select:hover {
  border-color: var(--md-outline);
  background-color: var(--md-surface-container);
}

.home-select:focus {
  border-color: var(--md-primary);
  border-width: 1.5px;
  box-shadow: 0 0 0 3px rgba(43, 91, 210, 0.15);
  background-color: var(--md-surface-container-high);
}

.home-stat {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
  margin-top: 8px;
}

.home-chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.stratified-preview {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--md-surface-container-high);
  border-radius: var(--md-radius-sm);
  line-height: 1.8;
}

.home-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 32px;
}

/* ============================================================
   Bank Grid
   ============================================================ */
.bank-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  padding: 8px 0;
}

.bank-card {
  cursor: pointer;
  transition: transform var(--md-transition-fast), box-shadow var(--md-transition-fast), background-color var(--md-transition-fast);
  min-height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 10px;
  border: 1px solid var(--md-outline-variant);
}

.bank-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--md-elevation-2);
  background: var(--md-surface-container);
  border-color: var(--md-primary);
}

.bank-card .bank-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--md-on-surface);
}

.bank-card .bank-count {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
}

/* ============================================================
   Question Card Section
   ============================================================ */
#question-card {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.question-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.type-badge {
  display: inline-flex;
  padding: 4px 12px;
  border-radius: var(--md-radius-xs);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-size: 0.75rem;
  font-weight: 700;
}

.question-number {
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
  font-weight: 600;
}

.question-timer {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--md-primary);
  font-variant-numeric: tabular-nums;
  background: var(--md-surface-container-high);
  padding: 2px 8px;
  border-radius: var(--md-radius-xs);
}

.question-timer.timer-warn {
  color: var(--md-error);
  background: var(--md-error-container);
  animation: pulse 0.5s ease-in-out infinite alternate;
}

.exam-timer {
  font-size: 0.9375rem;
  font-weight: 800;
  color: var(--md-primary);
  font-variant-numeric: tabular-nums;
  background: var(--md-surface-container-high);
  padding: 4px 10px;
  border-radius: var(--md-radius-xs);
}

.bookmark-btn {
  margin-left: auto;
  font-size: 1.35rem;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--md-outline);
  transition: all var(--md-transition-fast);
  padding: 6px;
  border-radius: var(--md-radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.bookmark-btn:hover {
  color: var(--md-warning);
  transform: scale(1.2) rotate(12deg);
  background: rgba(245, 166, 35, 0.08);
}

.bookmark-btn:active {
  transform: scale(0.9);
}

.bookmark-btn.bookmarked {
  color: var(--md-warning);
}

.question-text {
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.8;
  margin-bottom: 24px;
  color: var(--md-on-surface);
}

.question-text img {
  max-width: 100%;
  border-radius: var(--md-radius-md);
  margin: 16px 0;
  box-shadow: var(--md-elevation-1);
}

.question-text strong,
.question-text b {
  color: var(--md-primary);
  font-weight: 700;
}

.question-text code {
  background: var(--md-surface-container-high);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, Monaco, monospace;
  font-size: 0.9em;
  color: var(--md-primary);
}

/* ============================================================
   Option List
   ============================================================ */
.option-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.option-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border: 2px solid var(--md-outline-variant);
  border-radius: var(--md-radius-lg);
  cursor: pointer;
  transition: all 250ms cubic-bezier(0.2, 0.8, 0.2, 1);
  user-select: none;
  background: var(--md-surface-container-low);
  position: relative;
  overflow: hidden;
}

.option-item:hover {
  border-color: var(--md-primary);
  background: var(--md-surface-container);
  transform: translateY(-2px);
  box-shadow: var(--md-elevation-1);
}

.option-item:active {
  transform: translateY(0);
  background: var(--md-surface-container-high);
}

.option-item.selected {
  border-color: var(--md-primary);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  box-shadow: var(--md-elevation-1);
}

.option-item.correct {
  border-color: var(--md-success);
  background: var(--md-success-container);
  color: var(--md-on-success-container);
  box-shadow: none !important;
}

.option-item.correct:hover {
  transform: none;
  background: var(--md-success-container);
}

.option-item.incorrect {
  border-color: var(--md-error);
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  box-shadow: none !important;
}

.option-item.incorrect:hover {
  transform: none;
  background: var(--md-error-container);
}

.option-item .option-letter {
  width: 36px;
  height: 36px;
  border-radius: var(--md-radius-full);
  background: var(--md-surface-container-high);
  color: var(--md-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9375rem;
  flex-shrink: 0;
  transition: all var(--md-transition-fast);
  border: 1px solid var(--md-outline-variant);
}

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

.option-item.correct .option-letter {
  background: var(--md-success);
  color: var(--md-on-primary);
  border-color: var(--md-success);
}

.option-item.incorrect .option-letter {
  background: var(--md-error);
  color: var(--md-on-primary);
  border-color: var(--md-error);
}

.option-item .option-text {
  flex: 1;
  line-height: 1.6;
  font-weight: 500;
}

.option-item .option-icon {
  font-size: 1.35rem;
  font-weight: 700;
  flex-shrink: 0;
  display: none;
}

.option-item.correct .option-icon {
  display: block;
  color: var(--md-success);
}

.option-item.incorrect .option-icon {
  display: block;
  color: var(--md-error);
}

/* ============================================================
   Checkbox (Multiple Choice style indicator)
   ============================================================ */
.option-item .checkbox-indicator {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--md-outline);
  flex-shrink: 0;
  position: relative;
  transition: all var(--md-transition-fast);
  background: var(--md-surface-container-low);
}

.option-item.selected .checkbox-indicator {
  background: var(--md-primary);
  border-color: var(--md-primary);
}

.option-item.selected .checkbox-indicator::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: solid var(--md-on-primary);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

.option-item.correct .checkbox-indicator {
  background: var(--md-success);
  border-color: var(--md-success);
}

.option-item.correct .checkbox-indicator::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: solid var(--md-on-primary);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

.option-item.incorrect .checkbox-indicator {
  background: var(--md-error);
  border-color: var(--md-error);
}

.option-item.incorrect .checkbox-indicator::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 5px;
  width: 8px;
  height: 8px;
  background: var(--md-on-primary);
  clip-path: polygon(20% 0%, 0% 20%, 30% 50%, 0% 80%, 20% 100%, 50% 70%, 80% 100%, 100% 80%, 70% 50%, 100% 20%, 80% 0%, 50% 30%);
}

/* ============================================================
   Text Fields, Textareas & Fill In Blanks
   ============================================================ */
.md3-text-field {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.5;
  color: var(--md-on-surface);
  background: var(--md-surface-container-low);
  transition: all var(--md-transition);
  outline: none;
}

.md3-text-field:focus {
  border-color: var(--md-primary);
  background: var(--md-surface-container-high);
  box-shadow: 0 0 0 3px rgba(43, 91, 210, 0.15);
}

.md3-textarea {
  width: 100%;
  min-height: 140px;
  padding: 16px;
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.6;
  color: var(--md-on-surface);
  background: var(--md-surface-container-low);
  resize: vertical;
  transition: all var(--md-transition);
  outline: none;
}

.md3-textarea:focus {
  border-color: var(--md-primary);
  background: var(--md-surface-container-high);
  box-shadow: 0 0 0 3px rgba(43, 91, 210, 0.15);
}

.fill-blank-input {
  display: inline-block;
  width: auto;
  min-width: 80px;
  max-width: 400px;
  padding: 4px 12px;
  border: none;
  border-bottom: 2.5px solid var(--md-primary);
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  line-height: 1.5;
  color: var(--md-on-surface);
  background: var(--md-surface-container);
  border-radius: 6px 6px 0 0;
  outline: none;
  text-align: center;
  transition: all var(--md-transition-fast), width 0.1s ease;
}

.fill-blank-input:focus {
  background: var(--md-primary-container);
  border-bottom-color: var(--md-primary);
}

.fill-blank-feedback-wrap {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  vertical-align: middle;
  margin: 0 4px;
}

.fill-blank-correct-hint {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--md-success);
  background: var(--md-success-container);
  padding: 1px 8px;
  border-radius: 4px;
  line-height: 1.4;
  margin-top: 4px;
  border: 1px solid var(--md-success);
  white-space: nowrap;
  box-shadow: var(--md-elevation-1);
  animation: slideUp 200ms cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: 1;
}

@media (prefers-color-scheme: dark) {
  .fill-blank-correct-hint {
    background: rgba(130, 217, 153, 0.15);
    color: var(--md-success);
    border-color: var(--md-success);
  }
}

/* ============================================================
   Ordering List
   ============================================================ */
.ordering-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.ordering-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 18px;
  background: var(--md-surface-container-low);
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
  cursor: grab;
  user-select: none;
  transition: all 250ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.ordering-item:active {
  cursor: grabbing;
}

.ordering-item.dragging {
  opacity: 0.4;
  border-style: dashed;
  background: var(--md-surface-container-high);
}

.ordering-item.drag-over {
  border-color: var(--md-primary);
  background: var(--md-primary-container);
}

.ordering-item.correct {
  border-color: var(--md-success);
  background: var(--md-success-container);
  color: var(--md-on-success-container);
}

.ordering-item.correct .order-index {
  background: var(--md-success);
  color: var(--md-on-primary);
}

.ordering-item.incorrect {
  border-color: var(--md-error);
  background: var(--md-error-container);
  color: var(--md-on-error-container);
}

.ordering-item.incorrect .order-index {
  background: var(--md-error);
  color: var(--md-on-primary);
}

.ordering-item .drag-handle {
  color: var(--md-on-surface-variant);
  font-size: 1.35rem;
  cursor: grab;
  flex-shrink: 0;
  user-select: none;
}

.ordering-item .order-index {
  width: 30px;
  height: 30px;
  border-radius: var(--md-radius-full);
  background: var(--md-primary);
  color: var(--md-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
}

.ordering-item .order-text {
  flex: 1;
  font-weight: 500;
}

.ordering-item .order-arrows {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.order-arrow {
  width: 32px;
  height: 24px;
  border: none;
  background: var(--md-surface-container);
  color: var(--md-on-surface-variant);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: all var(--md-transition-fast);
  border: 1px solid var(--md-outline-variant);
}

.order-arrow:hover:not(:disabled) {
  background: var(--md-surface-container-high);
  color: var(--md-primary);
  border-color: var(--md-primary);
  transform: scale(1.05);
}

.order-arrow:active:not(:disabled) {
  transform: scale(0.95);
}

.order-arrow:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.order-arrow svg {
  transition: transform var(--md-transition-fast);
}

.order-arrow:hover:not(:disabled) svg {
  stroke: var(--md-primary);
}

/* ============================================================
   Feedback (Answers Explanation)
   ============================================================ */
.feedback {
  padding: 20px;
  border-radius: var(--md-radius-lg);
  margin-top: 20px;
  display: none;
  animation: slideUp 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.feedback.visible {
  display: block;
}

.feedback.correct {
  background: var(--md-success-container);
  color: var(--md-on-success-container);
  border: 1px solid var(--md-success);
}

.feedback.incorrect {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  border: 1px solid var(--md-error);
}

.feedback.llm-pending {
  background: var(--md-warning-container);
  color: var(--md-on-warning-container);
  border: 1px solid var(--md-warning);
}

.feedback-header {
  font-weight: 700;
  font-size: 1.0625rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feedback-explanation {
  font-size: 0.9375rem;
  line-height: 1.7;
  font-weight: 500;
}

.feedback-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
  background: rgba(0, 0, 0, 0.03);
  border-radius: var(--md-radius-xs, 6px);
  border-left: 3px solid var(--md-outline-variant);
}

.feedback-section + .feedback-section {
  margin-top: 6px;
}

.feedback-section-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--md-on-surface-variant);
  opacity: 0.7;
}

@media (prefers-color-scheme: dark) {
  .feedback-section {
    background: rgba(255, 255, 255, 0.04);
  }
}


.feedback-explanation code {
  background: rgba(0, 0, 0, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
}

@media (prefers-color-scheme: dark) {
  .feedback-explanation code {
    background: rgba(255, 255, 255, 0.08);
  }
}

.self-grade-row {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

/* ============================================================
   Quiz Layout — Main + Sidebar
   ============================================================ */
.quiz-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 24px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  transition: all var(--md-transition);
}

.quiz-layout.sidebar-hidden {
  grid-template-columns: 1fr 0;
  gap: 0;
}

.quiz-main {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  min-height: 0;
  padding-right: 8px;
}

.quiz-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-radius-lg);
  padding: 20px;
  overflow-y: auto;
  min-height: 0;
  transition: all var(--md-transition);
}

.quiz-sidebar.collapsed {
  width: 0;
  min-width: 0;
  padding: 0;
  border: none;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
}

/* Sidebar Progress widget */
.sidebar-progress {
  text-align: center;
  padding: 14px 12px;
  background: var(--md-surface-container);
  border-radius: var(--md-radius-md);
  border: 1px solid var(--md-outline-variant);
}

.sidebar-progress .sidebar-count {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--md-primary);
  line-height: 1.2;
}

.sidebar-progress .sidebar-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
}

/* Sidebar header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.sidebar-header-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.sidebar-settings-btn {
  padding: 6px 14px;
  border-radius: var(--md-radius-full);
  border: 1.5px solid var(--md-outline-variant);
  background: var(--md-surface);
  color: var(--md-on-surface-variant);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--md-transition-fast);
  white-space: nowrap;
}

.sidebar-settings-btn:hover {
  background: var(--md-surface-variant);
  border-color: var(--md-outline);
  color: var(--md-on-surface);
}

/* Sidebar Question Circle Grid */
.sidebar-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  align-content: start;
}

.sidebar-grid-btn {
  aspect-ratio: 1;
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-full);
  background: var(--md-surface);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--md-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--md-transition-fast);
  padding: 0;
  min-width: 0;
}

.sidebar-grid-btn:hover {
  background: var(--md-surface-variant);
  transform: scale(1.1);
  border-color: var(--md-outline);
}

.sidebar-grid-btn:active {
  transform: scale(0.9);
}

.sidebar-grid-btn.current {
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-color: var(--md-primary);
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(43, 91, 210, 0.35);
}

.sidebar-grid-btn.answered {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
}

.sidebar-grid-btn.correct {
  background: var(--md-success-container);
  color: var(--md-on-success-container);
  border-color: transparent;
}

.sidebar-grid-btn.incorrect {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  border-color: transparent;
}

.sidebar-grid-btn.bookmarked-item {
  box-shadow: 0 0 0 2.5px var(--md-warning);
}

/* Sidebar footer buttons */
.sidebar-nav {
  display: flex;
  gap: 6px;
}

.sidebar-nav button {
  flex: 1;
  font-size: 0.75rem;
  padding: 8px 10px;
}

/* Bottom Actions Row */
.quiz-nav-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  flex-shrink: 0;
}

.quiz-nav-row > .md3-btn {
  flex-shrink: 0;
}

.main-action-btn {
  flex: 1;
}

.main-action-btn .md3-btn {
  width: 100%;
  padding: 14px 28px;
  font-size: 1rem;
  letter-spacing: 0.3px;
  box-shadow: var(--md-elevation-1);
}

/* Legacy Quiz Nav (kept for results / manual jump layout compatibility) */
.quiz-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--md-outline-variant);
  margin-top: auto;
}

.quiz-nav .md3-btn {
  flex: 1;
}

.question-jump-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 6px;
  max-height: 300px;
  overflow-y: auto;
  padding: 8px;
}

.question-jump-btn {
  width: 100%;
  aspect-ratio: 1;
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-full);
  background: var(--md-surface);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--md-on-surface-variant);
  transition: all var(--md-transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.question-jump-btn:hover {
  background: var(--md-surface-variant);
  transform: scale(1.1);
}

.question-jump-btn.current {
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-color: var(--md-primary);
  font-weight: 700;
}

.question-jump-btn.answered {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
}

.question-jump-btn.correct-q {
  background: var(--md-success-container);
  color: var(--md-on-success-container);
  border-color: transparent;
}

.question-jump-btn.incorrect-q {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  border-color: transparent;
}

.question-jump-btn.bookmarked-q {
  box-shadow: inset 0 0 0 2px var(--md-warning);
}

/* ============================================================
   Results View
   ============================================================ */
#view-results {
  overflow-y: auto;
  min-height: 0;
}

.result-summary {
  text-align: center;
  padding: 40px 24px;
  background: var(--md-surface-container-low);
  border-radius: var(--md-radius-lg);
  border: 1px solid var(--md-outline-variant);
  margin-bottom: 24px;
}

.result-score {
  font-size: 5rem;
  font-weight: 800;
  color: var(--md-primary);
  line-height: 1;
  background: linear-gradient(135deg, var(--md-primary), #5B84FA);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.result-percent {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
  margin-top: 4px;
}

.result-stats {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.result-stat {
  text-align: center;
  background: var(--md-surface-container);
  padding: 12px 24px;
  border-radius: var(--md-radius-md);
  border: 1px solid var(--md-outline-variant);
  min-width: 100px;
}

.result-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--md-on-surface);
}

.result-stat-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
}

.result-review-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 4px;
}

.result-review-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-radius: var(--md-radius-md);
  border: 1.5px solid var(--md-outline-variant);
  background: var(--md-surface-container-low);
  cursor: pointer;
  transition: all var(--md-transition-fast);
}

.result-review-item:hover {
  background: var(--md-surface-container);
  border-color: var(--md-outline);
  transform: translateY(-1.5px);
}

.result-review-item .review-id {
  font-weight: 700;
  font-size: 0.9375rem;
  min-width: 32px;
}

.result-review-item .review-status {
  font-size: 1.25rem;
  font-weight: 700;
}

.result-review-item .review-type {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--md-surface-variant);
}

.result-review-item .review-preview {
  flex: 1;
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--md-on-surface-variant);
}

/* ============================================================
   Settings View
   ============================================================ */
.settings-section {
  margin-bottom: 28px;
  background: var(--md-surface-container-low);
  padding: 20px;
  border-radius: var(--md-radius-lg);
  border: 1px solid var(--md-outline-variant);
}

.settings-section h3 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--md-primary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
}

.settings-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.settings-row:last-child {
  margin-bottom: 0;
}

.settings-row label {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
}

.settings-row input,
.settings-row select {
  padding: 12px 14px;
  border: 1.5px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  font-weight: 500;
  background: var(--md-surface);
  color: var(--md-on-surface);
  outline: none;
  transition: all var(--md-transition-fast);
}

.settings-row input:focus,
.settings-row select:focus {
  border-color: var(--md-primary);
  box-shadow: 0 0 0 3px rgba(43, 91, 210, 0.15);
}

/* ============================================================
   Dialogs (Modern Pop-in style)
   ============================================================ */
.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(18, 19, 24, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 250ms ease-out;
}

.dialog {
  background: var(--md-surface-container-high);
  border-radius: var(--md-radius-xl);
  padding: 28px;
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--md-elevation-3);
  border: 1px solid var(--md-outline-variant);
  animation: slideUp 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.dialog h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--md-on-surface);
}

.dialog-body {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--md-on-surface-variant);
  margin-bottom: 12px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

/* ============================================================
   Snackbar / Toast (MD3 Float style)
   ============================================================ */
.snackbar {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--md-on-surface-variant);
  color: var(--md-surface);
  padding: 14px 24px;
  border-radius: var(--md-radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 200;
  box-shadow: var(--md-elevation-3);
  animation: slideUp 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  align-items: center;
  gap: 16px;
}

.snackbar-action {
  background: none;
  border: none;
  color: var(--md-primary);
  font-weight: 700;
  font-size: 0.875rem;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: var(--md-radius-full);
  transition: all var(--md-transition-fast);
}

.snackbar-action:hover {
  background: rgba(255, 255, 255, 0.12);
}

/* ============================================================
   Toolbar
   ============================================================ */
.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 0;
  align-items: center;
}

.toolbar .spacer {
  flex: 1;
}

/* ============================================================
   Empty State
   ============================================================ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
  text-align: center;
  gap: 16px;
  color: var(--md-on-surface-variant);
}

.empty-state .empty-icon {
  font-size: 3.5rem;
  margin-bottom: 8px;
  color: var(--md-outline);
}

.empty-state .empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-on-surface);
}

/* ============================================================
   Loading
   ============================================================ */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
  gap: 20px;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid var(--md-surface-variant);
  border-top-color: var(--md-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ============================================================
   Hint toggle widget
   ============================================================ */
.hint-toggle {
  font-size: 0.75rem;
  color: var(--md-primary);
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-radius-full);
  padding: 4px 14px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  transition: all var(--md-transition-fast);
}

.hint-toggle:hover {
  background: var(--md-primary-container);
  border-color: var(--md-primary);
}

.hint-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
  margin-left: 8px;
  opacity: 0.8;
  background: var(--md-surface-container-low);
  padding: 4px 12px;
  border-radius: 6px;
  border: 1px dashed var(--md-outline-variant);
}

.hint-text.hidden {
  display: none;
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translate3d(0, 24px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.shake {
  animation: shake 0.35s ease;
}

@keyframes pulse {
  from { opacity: 1; }
  to { opacity: 0.45; }
}

/* ============================================================
   Responsive (Refining layout for smaller viewports)
   ============================================================ */
@media (max-width: 768px) {
  #main-content {
    padding: 16px;
  }

  .home-container {
    padding: 16px 8px;
  }

  .quiz-layout {
    grid-template-columns: 1fr;
    gap: 0;
    position: relative;
  }

  .quiz-sidebar {
    position: fixed;
    top: 56px; /* below the app bar */
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 80vw;
    z-index: 100;
    border-radius: var(--md-radius-lg) 0 0 var(--md-radius-lg);
    box-shadow: var(--md-elevation-3);
    background: var(--md-surface-container-high);
    border: none;
    border-left: 1px solid var(--md-outline-variant);
    padding: 20px;
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
    max-height: none;
    transition: transform var(--md-transition), opacity var(--md-transition);
  }

  .quiz-sidebar.collapsed {
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
    width: 280px;
    padding: 20px;
    border: none;
  }

  /* Sidebar overlay backdrop */
  .quiz-layout::after {
    content: '';
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--md-transition);
  }

  .quiz-layout:not(.sidebar-hidden)::after {
    opacity: 1;
    pointer-events: auto;
  }

  .bank-grid {
    grid-template-columns: 1fr;
  }

  .question-text {
    font-size: 1.0625rem;
  }

  .result-score {
    font-size: 3.5rem;
  }

  .result-stats {
    gap: 14px;
  }

  .result-stat {
    padding: 8px 16px;
  }
}

@media (min-width: 769px) {
  .bank-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   Custom Scrollbar
   ============================================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--md-outline-variant);
  border-radius: 9999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--md-outline);
  border: 2px solid transparent;
  background-clip: padding-box;
}

/* ============================================================
   Markdown Styling (Tables, Lists, Blockquotes, etc.)
   ============================================================ */
.question-text table,
.feedback-explanation table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.9rem;
  line-height: 1.5;
  border-radius: var(--md-radius-sm);
  overflow: hidden;
  border: 1.5px solid var(--md-outline-variant);
  background-color: var(--md-surface-container-low);
}

.question-text th,
.question-text td,
.feedback-explanation th,
.feedback-explanation td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--md-outline-variant);
}

.question-text th,
.feedback-explanation th {
  background-color: var(--md-surface-container);
  color: var(--md-on-surface);
  font-weight: 600;
  border-bottom: 2px solid var(--md-outline);
}

.question-text tr:last-child td,
.feedback-explanation tr:last-child td {
  border-bottom: none;
}

.question-text tr:nth-child(even),
.feedback-explanation tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.015);
}

@media (prefers-color-scheme: dark) {
  .question-text tr:nth-child(even),
  .feedback-explanation tr:nth-child(even) {
    background-color: rgba(255, 255, 255, 0.015);
  }
}

/* Lists and paragraphs */
.question-text ul,
.question-text ol,
.feedback-explanation ul,
.feedback-explanation ol {
  padding-left: 20px;
  margin: 4px 0;
}

.question-text li,
.feedback-explanation li {
  margin-bottom: 2px;
}

.question-text p,
.feedback-explanation p {
  margin-bottom: 6px;
}

.question-text p:last-child,
.feedback-explanation p:last-child {
  margin-bottom: 0;
}

.question-text blockquote,
.feedback-explanation blockquote {
  border-left: 4px solid var(--md-primary);
  padding: 8px 16px;
  margin: 12px 0;
  background-color: var(--md-surface-container-low);
  color: var(--md-on-surface-variant);
  border-radius: 0 var(--md-radius-xs) var(--md-radius-xs) 0;
}

/* Slider / Range Input styling */
.md3-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--md-radius-full);
  background: var(--md-surface-container-highest);
  outline: none;
  margin: 12px 0;
}

.md3-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--md-primary);
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.1s ease;
}

.md3-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: var(--md-primary-container);
}

.md3-slider::-webkit-slider-thumb:active {
  transform: scale(1.3);
  background: var(--md-primary);
}

.md3-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: var(--md-primary);
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.1s ease;
}

.md3-slider::-moz-range-thumb:hover {
  transform: scale(1.2);
}

/* ============================================================
   Optimized Start Page / Home Dashboard UI
   ============================================================ */

.home-hero {
  text-align: center;
  margin-bottom: 28px;
  padding: 28px 24px;
  background: linear-gradient(135deg, var(--md-primary-container), var(--md-secondary-container));
  border-radius: var(--md-radius-lg);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--md-outline-variant);
}

.home-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--md-surface);
  color: var(--md-primary);
  padding: 4px 12px;
  border-radius: var(--md-radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--md-outline-variant);
}

.home-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--md-primary);
  border-radius: 50%;
  animation: pulse-glow 1.8s infinite ease-in-out;
}

.home-hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--md-on-primary-container);
  margin: 0;
  letter-spacing: -0.5px;
}

.home-hero-subtitle {
  font-size: 0.8125rem;
  color: var(--md-on-primary-container);
  margin: 8px 0 0 0;
  opacity: 0.8;
  font-weight: 500;
}

.home-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}

.home-stat-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--md-surface-container-low);
  padding: 10px 14px;
  border-radius: var(--md-radius-md);
  border: 1px solid var(--md-outline-variant);
  transition: transform var(--md-transition-fast), box-shadow var(--md-transition-fast), background-color var(--md-transition-fast);
}

.home-stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
  background: var(--md-surface-container);
}

.home-stat-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.home-stat-icon.answered {
  background: var(--md-success-container);
  color: var(--md-on-success-container);
}

.home-stat-icon.wrong {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
}

.home-stat-info {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.home-stat-num {
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--md-on-surface);
}

.home-stat-label {
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
  font-weight: 600;
  opacity: 0.8;
}

#btn-start-quiz {
  transition: transform var(--md-transition-fast), box-shadow var(--md-transition-fast), background-color var(--md-transition-fast);
}
#btn-start-quiz:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(43, 91, 210, 0.35);
}

@keyframes pulse-glow {
  0% { transform: scale(0.9); opacity: 0.4; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.4; }
}

/* Settings Toggle & Warning Banner */
.settings-collapsed-card {
  cursor: pointer;
  margin-bottom: 20px;
}
.settings-collapsed-card:hover {
  background: var(--md-surface-container);
  border-color: var(--md-outline);
}
.settings-toggle-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4px;
  margin-bottom: 12px;
}
.warning-banner {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  padding: 12px 16px;
  border-radius: var(--md-radius-md);
  margin-bottom: 16px;
  border: 1px solid var(--md-error);
  font-size: 0.8125rem;
  line-height: 1.4;
}

/* Subjective question self-grading score input panel */
.self-grading-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
}
.self-grade-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
}
.self-grade-input-row {
  display: flex;
  gap: 8px;
  align-items: center;
  width: 100%;
}
.self-grade-input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
}
.self-grade-input-row .md3-btn {
  flex-shrink: 0;
  white-space: nowrap;
}
@media (max-width: 480px) {
  .quiz-nav-row.has-self-grade {
    flex-wrap: wrap;
    gap: 8px;
  }
  .quiz-nav-row.has-self-grade #btn-prev {
    flex: 1 1 100% !important;
    order: 2;
  }
  .quiz-nav-row.has-self-grade .main-action-btn {
    flex: 1 1 100% !important;
    order: 1;
  }
}

/* ============================================================
   Question Card Slide Animations
   ============================================================ */
@keyframes slideInFromRight {
  from { transform: translateX(56px); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}
@keyframes slideInFromLeft {
  from { transform: translateX(-56px); opacity: 0; }
  to   { transform: translateX(0);     opacity: 1; }
}
.card-slide-in-right {
  animation: slideInFromRight 240ms cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}
.card-slide-in-left {
  animation: slideInFromLeft 240ms cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}

@keyframes correctFlash {
  0%   { box-shadow: 0 0 0 0 rgba(var(--md-success-rgb, 52, 168, 83), 0); background: inherit; }
  20%  { box-shadow: 0 0 0 6px rgba(var(--md-success-rgb, 52, 168, 83), 0.25);
         background: color-mix(in srgb, var(--md-success-container, #c8f5d0) 35%, var(--md-surface)); }
  70%  { box-shadow: 0 0 0 10px rgba(var(--md-success-rgb, 52, 168, 83), 0.08);
         background: color-mix(in srgb, var(--md-success-container, #c8f5d0) 20%, var(--md-surface)); }
  100% { box-shadow: none; background: inherit; }
}
.correct-flash {
  animation: correctFlash 680ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ============================================================
   Scoring Bottom Sheet
   ============================================================ */
.scoring-sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0);
  z-index: 201;
  display: flex;
  align-items: flex-end;
  transition: background 300ms ease;
}
.scoring-sheet-overlay.active {
  background: rgba(0, 0, 0, 0.45);
}
.scoring-sheet {
  background: var(--md-surface-container);
  border-radius: var(--md-radius-lg) var(--md-radius-lg) 0 0;
  padding: 12px 28px 40px;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  margin: 0 auto;
  box-shadow: 0 -4px 32px rgba(0,0,0,0.18);
  transform: translateY(100%);
  transition: transform 320ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.scoring-sheet-overlay.active .scoring-sheet {
  transform: translateY(0);
}
.scoring-sheet-handle {
  width: 40px;
  height: 4px;
  border-radius: 2px;
  background: var(--md-outline-variant);
  margin: 0 auto 4px;
  flex-shrink: 0;
}
.scoring-sheet-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--md-on-surface-variant);
  text-align: center;
  letter-spacing: 0.5px;
}
.scoring-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}
.scoring-val {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--md-primary);
  line-height: 1;
  min-width: 3.5rem;
  text-align: right;
  transition: color 150ms;
}
.scoring-sep {
  font-size: 1.1rem;
  color: var(--md-on-surface-variant);
  font-weight: 500;
}
/* Range slider — cross-browser MD3 look */
.scoring-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--md-radius-full);
  background: linear-gradient(
    to right,
    var(--md-primary) 0%,
    var(--md-primary) var(--pct, 0%),
    var(--md-surface-container-high) var(--pct, 0%),
    var(--md-surface-container-high) 100%
  );
  outline: none;
  cursor: pointer;
}
.scoring-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--md-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  transition: transform 120ms, box-shadow 120ms;
  cursor: grab;
}
.scoring-slider:active::-webkit-slider-thumb {
  transform: scale(1.25);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  cursor: grabbing;
}
.scoring-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: var(--md-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  cursor: grab;
}
.scoring-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
  margin-top: -10px;
}
.scoring-sheet-actions {
  display: flex;
  gap: 12px;
}
.scoring-sheet-actions .md3-btn {
  flex: 1;
  height: 48px;
}

/* Reference answer in scoring sheet */
.scoring-ref-answer {
  background: var(--md-surface-container-low);
  border-radius: var(--md-radius-sm);
  padding: 12px 14px;
}
.scoring-ref-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--md-primary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 8px;
}
.scoring-ref-body {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--md-on-surface);
}
.scoring-ref-explanation {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--md-on-surface-variant);
  opacity: 0.85;
}
.scoring-divider {
  height: 1px;
  background: var(--md-outline-variant);
  margin: -4px 0;
}