:root {
  --m3-sys-light-primary: #006837;
  --m3-sys-light-on-primary: #ffffff;
  --m3-sys-light-primary-container: #c2f0d1;
  --m3-sys-light-on-primary-container: #00210c;
  --m3-sys-light-secondary: #fff200;
  --m3-sys-light-on-secondary: #1d1c00;
  --m3-sys-light-secondary-container: #fff9be;
  --m3-sys-light-on-secondary-container: #241f00;
  --m3-sys-light-background: #fbfdf7;
  --m3-sys-light-on-background: #1a1c18;
  --m3-sys-light-surface: #fbfdf7;
  --m3-sys-light-on-surface: #1a1c18;
  --m3-sys-light-surface-variant: #e0e4db;
  --m3-sys-light-on-surface-variant: #43483f;
  --m3-sys-outline: #74796e;
  --m3-sys-light-error: #ba1a1a;
  --m3-sys-light-error-container: #ffdad6;
  --m3-sys-light-on-error: #ffffff;
  --m3-sys-light-on-error-container: #410002;
  --m3-sys-light-success: #2e7d32;
  --m3-sys-light-success-container: #c8e6c9;
  --m3-sys-light-on-success: #ffffff;
  --m3-sys-light-on-success-container: #1b5e20;
  --m3-sys-dark-primary: #7edd99;
  --m3-sys-dark-on-primary: #00391b;
  --m3-sys-dark-primary-container: #00522c;
  --m3-sys-dark-on-primary-container: #99faba;
  --m3-sys-dark-secondary: #e6d500;
  --m3-sys-dark-on-secondary: #332f00;
  --m3-sys-dark-secondary-container: #4c4600;
  --m3-sys-dark-on-secondary-container: #ffeb3b;
  --m3-sys-dark-background: #1a1c18;
  --m3-sys-dark-on-background: #e2e3dd;
  --m3-sys-dark-surface: #1a1c18;
  --m3-sys-dark-on-surface: #e2e3dd;
  --m3-sys-dark-surface-variant: #43483f;
  --m3-sys-dark-on-surface-variant: #c3c8bc;
  --m3-sys-dark-outline: #8d9287;
  --m3-sys-dark-error: #ffb4ab;
  --m3-sys-dark-error-container: #93000a;
  --m3-sys-dark-on-error: #690005;
  --m3-sys-dark-on-error-container: #ffdad6;
  --m3-sys-dark-success: #81c784;
  --m3-sys-dark-success-container: #1b5e20;
  --m3-sys-dark-on-success: #1b5e20;
  --m3-sys-dark-on-success-container: #c8e6c9;
  --elevation-1:
    0 1px 3px 1px rgba(0, 0, 0, 0.15), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --elevation-2:
    0 2px 6px 2px rgba(0, 0, 0, 0.15), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --elevation-3:
    0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 4px 8px 3px rgba(0, 0, 0, 0.15);
  --transition-short: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}
body.m3-theme-light {
  --primary: var(--m3-sys-light-primary);
  --on-primary: var(--m3-sys-light-on-primary);
  --primary-container: var(--m3-sys-light-primary-container);
  --on-primary-container: var(--m3-sys-light-on-primary-container);
  --secondary: var(--m3-sys-light-secondary);
  --on-secondary: var(--m3-sys-light-on-secondary);
  --secondary-container: var(--m3-sys-light-secondary-container);
  --on-secondary-container: var(--m3-sys-light-on-secondary-container);
  --background: var(--m3-sys-light-background);
  --on-background: var(--m3-sys-light-on-background);
  --surface: var(--m3-sys-light-surface);
  --on-surface: var(--m3-sys-light-on-surface);
  --surface-variant: var(--m3-sys-light-surface-variant);
  --on-surface-variant: var(--m3-sys-light-on-surface-variant);
  --outline: var(--m3-sys-light-outline);
  --error: var(--m3-sys-light-error);
  --error-container: var(--m3-sys-light-error-container);
  --on-error: var(--m3-sys-light-on-error);
  --on-error-container: var(--m3-sys-light-on-error-container);
  --success: var(--m3-sys-light-success);
  --success-container: var(--m3-sys-light-success-container);
  --on-success: var(--m3-sys-light-on-success);
  --on-success-container: var(--m3-sys-light-on-success-container);
}
body.m3-theme-dark {
  --primary: var(--m3-sys-dark-primary);
  --on-primary: var(--m3-sys-dark-on-primary);
  --primary-container: var(--m3-sys-dark-primary-container);
  --on-primary-container: var(--m3-sys-dark-on-primary-container);
  --secondary: var(--m3-sys-dark-secondary);
  --on-secondary: var(--m3-sys-dark-on-secondary);
  --secondary-container: var(--m3-sys-dark-secondary-container);
  --on-secondary-container: var(--m3-sys-dark-on-secondary-container);
  --background: var(--m3-sys-dark-background);
  --on-background: var(--m3-sys-dark-on-background);
  --surface: var(--m3-sys-dark-surface);
  --on-surface: var(--m3-sys-dark-on-surface);
  --surface-variant: var(--m3-sys-dark-surface-variant);
  --on-surface-variant: var(--m3-sys-dark-on-surface-variant);
  --outline: var(--m3-sys-dark-outline);
  --error: var(--m3-sys-dark-error);
  --error-container: var(--m3-sys-dark-error-container);
  --on-error: var(--m3-sys-dark-on-error);
  --on-error-container: var(--m3-sys-dark-on-error-container);
  --success: var(--m3-sys-dark-success);
  --success-container: var(--m3-sys-dark-success-container);
  --on-success: var(--m3-sys-dark-on-success);
  --on-success-container: var(--m3-sys-dark-on-success-container);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}
body {
  font-family: "Noto Sans", "Noto Sans Arabic", sans-serif;
  background-color: var(--background);
  color: var(--on-background);
  transition:
    background-color var(--transition-medium),
    color var(--transition-medium);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}
a {
  color: var(--on-primary-container);
  text-decoration: none;
  transition: color var(--transition-short);
}
a:hover,
a:active {
  color: var(--on-success-container);
}
h1,
h2,
h3,
h4 {
  font-weight: 500;
  line-height: 1.25;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
html[dir="rtl"] {
  font-family: "Noto Sans Arabic", "Noto Nastaliq Urdu", sans-serif;
}
html[dir="rtl"] p,
html[dir="rtl"] span,
html[dir="rtl"] input,
html[dir="rtl"] button,
html[dir="rtl"] h1,
html[dir="rtl"] h2,
html[dir="rtl"] h3 {
  text-align: right;
}
[lang="ur"] {
  line-height: 2 !important;
  padding-bottom: 4px;
}
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.56);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 16px;
  opacity: 1;
  transition: opacity var(--transition-medium);
}
.modal-overlay.hidden {
  display: none !important;
  opacity: 0;
  pointer-events: none;
}
.onboarding-card {
  width: 100%;
  max-width: 400px;
  padding: 28px;
  text-align: center;
  background-color: var(--surface);
  box-shadow: var(--elevation-3);
  border-radius: 28px;
  border: 1px solid var(--surface-variant);
  animation: slideIn var(--transition-medium);
}
.onboarding-card h2 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 8px;
}
.onboarding-card p {
  font-size: 14px;
  color: var(--on-surface-variant);
  margin-bottom: 24px;
}
.onboarding-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.m3-top-app-bar-wrapper {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  direction: ltr;
  background-color: var(--surface);
  border-bottom: 1px solid var(--surface-variant);
  box-shadow: var(--elevation-1);
  display: flex;
  flex-direction: column;
}
.m3-top-app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 16px;
  background-color: var(--surface);
  color: var(--on-surface);
  transition: background-color var(--transition-medium);
}
.app-bar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.app-title-en {
  font-size: 22px;
  font-weight: 500;
  color: var(--primary);
}
.app-bar-actions {
  display: flex;
  gap: 8px;
}
.m3-icon-button {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  transition:
    background-color var(--transition-short),
    color var(--transition-short);
}
.m3-icon-button:hover {
  background-color: var(--surface-variant);
  color: var(--on-surface);
}
.m3-icon-button:active {
  background-color: var(--primary-container);
}
.m3-icon {
  width: 24px;
  height: 24px;
}
.m3-navigation-bar.top-nav {
  display: flex;
  height: 58px;
  background-color: var(--surface);
  position: relative;
  justify-content: space-around;
  padding: 4px 8px;
  border-top: 1px solid var(--surface-variant);
}
.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  outline: none;
  cursor: pointer;
  color: var(--on-surface-variant);
  width: 72px;
  gap: 2px;
  transition: color var(--transition-short);
}
.nav-icon-container {
  width: 56px;
  height: 28px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background-color var(--transition-medium),
    color var(--transition-medium);
}
.nav-icon {
  width: 22px;
  height: 22px;
}
.nav-label {
  font-size: 11px;
  font-weight: 500;
  transition: color var(--transition-medium);
}
.nav-item.active .nav-icon-container {
  background-color: var(--primary-container);
  color: var(--on-primary-container);
}
.nav-item.active .nav-label {
  color: var(--on-surface);
  font-weight: 700;
}
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 2100;
  transition: opacity var(--transition-medium);
}
.sidebar-overlay.hidden {
  display: none !important;
  opacity: 0;
  pointer-events: none;
}
.m3-sidebar-drawer {
  position: fixed;
  top: 0;
  width: 100%;
  max-width: 340px;
  height: 100%;
  background-color: var(--surface);
  box-shadow: var(--elevation-3);
  z-index: 2200;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-medium);
  border-left: 1px solid var(--surface-variant);
  right: 0;
  transform: translate3d(100%, 0, 0);
  visibility: hidden;
}
html[dir="rtl"] .m3-sidebar-drawer {
  left: 0;
  right: auto;
  transform: translate3d(-100%, 0, 0);
  border-left: none;
  border-right: 1px solid var(--surface-variant);
}
.m3-sidebar-drawer.active {
  visibility: visible;
  transform: translate3d(0, 0, 0) !important;
}
.sidebar-header {
  display: flex;
  direction: ltr;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--surface-variant);
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.sidebar-brand-icon {
  width: 28px;
  height: 28px;
  color: var(--primary);
}
.sidebar-app-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}
.sidebar-app-version {
  font-size: 11px;
  color: var(--on-surface-variant);
  display: block;
  margin-top: -2px;
}
.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}
.sidebar-tagline {
  font-size: 14px;
  font-weight: 500;
  color: var(--on-surface-variant);
  margin-bottom: 20px;
}
.sidebar-section {
  margin-bottom: 24px;
}
.sidebar-section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.sidebar-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--on-surface);
}
.sidebar-list {
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--on-surface);
}
.sidebar-list li {
  margin-bottom: 8px;
}
html[dir="rtl"] .sidebar-list {
  padding-left: 0;
  padding-right: 20px;
}
.m3-container {
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 16px;
  flex: 1;
}
.app-view {
  display: none;
  opacity: 0;
  transform: translate3d(0, 12px, 0);
  transition:
    opacity var(--transition-medium),
    transform var(--transition-medium);
  will-change: opacity, transform;
}
.app-view.active {
  display: block;
  opacity: 1;
  transform: translate3d(0, 0, 0);
}
.dashboard-hero {
  text-align: center;
  padding: 24px 16px;
  background-color: var(--primary-container);
  border-radius: 28px;
  margin-bottom: 24px;
}
.welcome-heading {
  color: var(--on-primary-container);
  font-size: 28px;
  margin-bottom: 8px;
}
.welcome-sub {
  color: var(--on-primary-container);
  font-size: 14px;
  opacity: 0.9;
}
.stats-overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.m3-stat-card {
  background-color: var(--surface-variant);
  padding: 16px;
  border-radius: 20px;
  text-align: center;
  box-shadow: var(--elevation-1);
}
.stat-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  display: block;
}
.stat-label {
  font-size: 12px;
  color: var(--on-surface-variant);
  font-weight: 500;
}
.quick-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.m3-button-filled,
.m3-button-tonal {
  height: 48px;
  border-radius: 24px;
  border: none;
  outline: none;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 24px;
  transition:
    box-shadow var(--transition-short),
    background-color var(--transition-short);
}
.m3-button-filled {
  background-color: var(--primary);
  color: var(--on-primary);
}
@media (hover: hover) {
  .m3-button-filled:hover {
    box-shadow: var(--elevation-2);
  }
}
.m3-button-tonal {
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
}
.sticky-filter-wrapper {
  position: sticky;
  top: 122px;
  background-color: var(--background);
  z-index: 90;
  padding: 8px 0 16px 0;
}
.m3-search-bar-row {
  display: flex;
  align-items: center;
  direction: ltr;
  gap: .5rem;
  margin-bottom: 12px;
}
.m3-search-bar {
  display: flex;
  align-items: center;
  background-color: var(--surface-variant);
  border-radius: 28px;
  height: fit-content;
  width: 90%;
  padding: .2rem;
  gap: .2rem;
  flex: 1;
}
.search-icon {
  width: 24px;
  height: 24px;
  color: var(--on-surface-variant);
}
html[dir="rtl"] .search-icon {
  margin-right: 0;
}
.m3-search-bar input {
  text-align: justify !important;
  border: none;
  background: transparent;
  outline: none;
  flex: 1;
  padding: .5rem 0;
  font-size: 18px;
  color: var(--on-surface);
}
.m3-chip-set {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0;
  scrollbar-width: none;
}
.m3-chip-set::-webkit-scrollbar {
  display: none;
}
.m3-chip {
  background-color: var(--surface);
  border: 1px solid var(--outline);
  color: var(--on-surface);
  height: 36px;
  border-radius: 8px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  display: flex;
  align-items: center;
  transition:
    background-color var(--transition-short),
    border-color var(--transition-short);
}
.m3-chip.active {
  background-color: var(--primary-container);
  border-color: var(--primary);
  color: var(--on-primary-container);
}
#chip-weak.active {
  background-color: var(--error-container);
  border-color: var(--error);
  color: var(--on-error-container);
}
.sign-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}
@media (min-width: 480px) {
  .sign-cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 16px;
  }
}
.m3-card {
  background-color: var(--surface);
  border-radius: 24px;
  border: 1px solid var(--surface-variant);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition:
    transform var(--transition-medium),
    box-shadow var(--transition-medium);
}
@media (hover: hover) {
  .m3-card:hover {
    transform: translate3d(0, -4px, 0);
    box-shadow: var(--elevation-2);
  }
}
.sign-card-image-box {
  background-color: #ffffff;
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  aspect-ratio: 1 / 1;
  border-bottom: 1px solid var(--surface-variant);
}
.sign-card-image-box img {
  max-height: 100px;
  object-fit: contain;
}
.sign-card-content {
  padding: 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.sign-card-title-en {
  font-size: 14px;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: 4px;
}
.sign-card-title-ur {
  font-size: 14px;
  font-weight: 400;
  color: var(--primary);
  text-align: right;
}
html[dir="rtl"] .sign-card-title-ur {
  text-align: left;
}
.card-actions-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}
.m3-category-badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
  font-weight: 700;
  text-transform: uppercase;
}
.quiz-setup-card {
  padding: 24px;
  gap: 20px;
}
.section-title {
  font-size: 24px;
  color: var(--on-surface);
  margin-bottom: 8px;
}
.section-desc {
  font-size: 14px;
  color: var(--on-surface-variant);
  margin-bottom: 16px;
}
.form-group {
  margin-bottom: 20px;
}
.border-top-group {
  border-top: 1px solid var(--surface-variant);
  padding-top: 20px;
  margin-top: 24px;
}
.m3-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  display: block;
  margin-bottom: 8px;
}
.checkbox-group,
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.m3-checkbox-label,
.m3-radio-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  cursor: pointer;
}
.m3-checkbox-label input,
.m3-radio-label input {
  width: 24px;
  height: 24px;
  accent-color: var(--primary);
  flex-shrink: 0;
}
.quiz-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 700;
}
.timer-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--error);
}
.m3-linear-progress {
  height: 4px;
  background-color: var(--surface-variant);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 24px;
}
.progress-indicator {
  height: 100%;
  background-color: var(--primary);
  transition: width var(--transition-short);
}
.quiz-question-card {
  margin-bottom: 24px;
}
.quiz-sign-frame {
  background-color: #ffffff;
  padding: 32px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid var(--surface-variant);
}
.quiz-sign-frame img {
  max-height: 150px;
  object-fit: contain;
}
.question-instruction {
  padding: 16px;
  font-size: 16px;
  text-align: center;
  line-height: 1.5;
}
.quiz-options-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.m3-option-button {
  background-color: var(--surface);
  border: 1px solid var(--outline);
  border-radius: 16px;
  padding: 16px;
  text-align: left;
  font-size: 15px;
  color: var(--on-surface);
  cursor: pointer;
  outline: none;
  transition:
    background-color var(--transition-short),
    border-color var(--transition-short);
  width: 100%;
  min-height: 48px;
}
html[dir="rtl"] .m3-option-button {
  text-align: right;
}
@media (hover: hover) {
  .m3-option-button:hover:not(:disabled) {
    background-color: var(--surface-variant);
  }
}
.m3-option-button.correct {
  background-color: var(--success-container) !important;
  color: var(--on-success-container) !important;
  border-color: var(--success) !important;
  font-weight: 700;
}
.m3-option-button.incorrect {
  background-color: var(--error-container) !important;
  color: var(--on-error-container) !important;
  border-color: var(--error) !important;
}
.results-summary-card {
  padding: 24px;
  text-align: center;
  margin-bottom: 24px;
}
.score-circle-wrapper {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}
.score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
#result-percentage,
#game-percentage {
  font-size: 32px;
  font-weight: 700;
}
#result-fraction-score,
#game-fraction-score {
  font-size: 14px;
  opacity: 0.8;
}
.result-breakdown-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}
.result-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
}
.result-badge.correct {
  background-color: var(--success-container);
  color: var(--on-success-container);
}
.result-badge.incorrect {
  background-color: var(--error-container);
  color: var(--on-error-container);
}
.result-verdict {
  font-size: 15px;
  margin-bottom: 24px;
  line-height: 1.45;
}
.results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.detailed-review-section {
  margin-top: 32px;
}
.review-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 16px;
}
.review-card {
  display: flex;
  gap: 16px;
  padding: 16px;
  border-radius: 16px;
  background-color: var(--surface-variant);
  align-items: center;
}
.review-img-box {
  width: 64px;
  height: 64px;
  background-color: #ffffff;
  border-radius: 12px;
  padding: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
}
.review-details {
  flex: 1;
}
.review-choices {
  font-size: 13px;
  margin-top: 4px;
}
.review-choice {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 2px;
}
.review-choice.selected {
  font-weight: 700;
}
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 16px;
  text-align: center;
  color: var(--on-surface-variant);
}
.empty-state-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}
.hidden {
  display: none !important;
}
.flashcard-deck {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin-top: 16px;
  perspective: 1000px;
  width: 100%;
}
.flashcard {
  width: 100%;
  max-width: 360px;
  height: 380px;
  border: none;
  background: transparent;
  cursor: pointer;
  outline: none;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}
.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 28px;
  border: 1px solid var(--surface-variant);
  background-color: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  box-shadow: var(--elevation-2);
}
.flashcard-back {
  transform: rotateY(180deg);
  border-color: var(--primary);
}
.flashcard-image-box {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #ffffff;
  border-radius: 20px;
  padding: 20px;
  margin-bottom: 16px;
  border: 1px solid var(--surface-variant);
}
.flashcard-image-box img {
  max-height: 160px;
  object-fit: contain;
}
.flashcard-front-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--on-surface-variant);
  opacity: 0.8;
}
.flashcard-back-details {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
}
.flashcard-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--on-surface);
  text-align: center;
}
.flashcard-back-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}
.flashcard-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 360px;
}
.flashcard-counter-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--on-surface-variant);
}
.view-header {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
}
.road-canvas-container {
  width: 100%;
  background-color: var(--surface-variant);
  border-radius: 28px;
  padding: 24px;
  margin: 16px 0;
  display: flex;
  justify-content: center;
  box-shadow: var(--elevation-1);
  overflow: hidden;
}
.virtual-road {
  position: relative;
  width: 100%;
  max-width: 280px;
  height: 400px;
  background-color: #2c3e50;
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  justify-content: space-between;
}
.road-edge {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  background-color: #bdc3c7;
}
.edge-left {
  left: 0;
}
.edge-right {
  right: 0;
}
.road-lane {
  width: calc(50% - 14px);
  height: 100%;
  position: relative;
}
.lane-left {
  margin-left: 14px;
}
.lane-right {
  margin-right: 14px;
}
.center-line-area {
  width: 12px;
  height: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
}
.interactive-road-mark {
  cursor: pointer;
  transition: all var(--transition-short);
}
.interactive-road-mark:hover {
  filter: brightness(1.2);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.6);
}
.interactive-road-mark.highlighted {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  filter: brightness(1.3);
}
.marking-curb {
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 6px;
  background: repeating-linear-gradient(
    to bottom,
    #f1c40f 0,
    #f1c40f 20px,
    #2c3e50 20px,
    #2c3e50 40px
  );
}
.marking-zebra {
  position: absolute;
  bottom: 40px;
  left: 0;
  right: 0;
  height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 4px 0;
}
.zebra-stripe {
  height: 8px;
  background-color: #ffffff;
  width: 100%;
}
.marking-solid-line {
  width: 4px;
  height: 50%;
  background-color: #ffffff;
  margin: 0 auto;
}
.marking-broken-line {
  width: 4px;
  height: 50%;
  background: repeating-linear-gradient(
    to bottom,
    #ffffff 0,
    #ffffff 15px,
    transparent 15px,
    transparent 30px
  );
  margin: 0 auto;
}
.marking-box-junction {
  position: absolute;
  top: 40px;
  left: 10px;
  right: 10px;
  height: 110px;
  border: 3px solid #f1c40f;
  background-color: rgba(241, 196, 15, 0.15);
  overflow: hidden;
}
.box-grid {
  width: 200%;
  height: 200%;
  position: absolute;
  top: -50%;
  left: -50%;
  background:
    linear-gradient(
      45deg,
      transparent 48%,
      #f1c40f 49%,
      #f1c40f 51%,
      transparent 52%
    ),
    linear-gradient(
      -45deg,
      transparent 48%,
      #f1c40f 49%,
      #f1c40f 51%,
      transparent 52%
    );
  background-size: 20px 20px;
}
.rule-info-card {
  padding: 16px;
  margin-top: 16px;
  border-left: 4px solid var(--primary);
  animation: slideIn var(--transition-medium);
}
html[dir="rtl"] .rule-info-card {
  border-left: none;
  border-right: 4px solid var(--primary);
}
.rule-info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.rule-info-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
}
.rule-desc {
  font-size: 14px;
  color: var(--on-surface);
  margin-bottom: 8px;
  line-height: 1.55;
}
.game-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--on-surface-variant);
}
.game-visual-board {
  margin-bottom: 20px;
  border: 1px solid var(--surface-variant);
  overflow: hidden;
}
.game-illustration-placeholder {
  width: 100%;
  background-color: #2c3e50;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid var(--surface-variant);
}
.road-game-visual {
  width: 100%;
  max-height: 240px;
}
.road-game-visual .lane-bg {
  fill: #2c3e50;
}
.road-game-visual .lane-edge {
  stroke: #bdc3c7;
  stroke-width: 4;
}
.road-game-visual .center-divider-solid {
  stroke: #ffffff;
  stroke-width: 2;
}
.road-game-visual .center-divider-broken {
  stroke: #ffffff;
  stroke-width: 2;
  stroke-dasharray: 6, 6;
}
.road-game-visual .marking-yellow {
  stroke: #f1c40f;
  stroke-width: 2;
}
.road-game-visual .car-body-main {
  fill: var(--primary);
}
.road-game-visual .car-body-alt {
  fill: #3498db;
}
.road-game-visual .car-text-label {
  fill: #ffffff;
  font-family: "Noto Sans", sans-serif;
  font-size: 7px;
  font-weight: bold;
  text-anchor: middle;
}
.road-game-visual .arrow-guide {
  stroke: #2ecc71;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.road-game-visual .danger-warning {
  fill: #e74c3c;
  opacity: 0.85;
}
.game-scenario-textbox {
  padding: 16px;
}
.app-footer {
  width: 100%;
  text-align: center;
  padding: 24px 16px;
  font-size: 12px;
  color: var(--on-surface-variant);
  opacity: 0.75;
  transition: color var(--transition-medium);
  margin-bottom: 16px;
}
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translate3d(0, 12px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}
@media (max-width: 600px) {
  body {
    padding-bottom: 80px;
  }
  .m3-navigation-bar.top-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1010;
    border-top: 1px solid var(--surface-variant);
    border-bottom: none;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
  }
  .sticky-filter-wrapper {
    top: 64px;
  }
}