@import './reset.css';
@import './variables.css';

html, body, #app {
  height: 100%;
  width: 100%;
}

body {
  background: var(--color-background);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
}

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

.screen {
  display: none;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

.screen.active {
  display: flex;
}

.screen__header {
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

.screen__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.screen__content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.screen__footer {
  padding: var(--spacing-md) var(--spacing-lg);
  flex-shrink: 0;
  border-top: 1px solid var(--color-border);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
  touch-action: manipulation;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:not(:disabled):hover,
.btn--primary:not(:disabled):active {
  background: var(--color-primary-dark);
  transform: scale(1.02);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:not(:disabled):hover,
.btn--secondary:not(:disabled):active {
  background: var(--color-surface-hover);
  border-color: var(--color-border-light);
}

.btn--danger {
  background: var(--color-danger);
  color: var(--color-text-inverse);
}

.btn--danger:not(:disabled):hover,
.btn--danger:not(:disabled):active {
  background: #dc2626;
  transform: scale(1.02);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:not(:disabled):hover,
.btn--ghost:not(:disabled):active {
  background: var(--color-surface);
  color: var(--color-text);
}

.btn--icon {
  padding: var(--spacing-sm);
}

.btn--block {
  width: 100%;
}

.btn--lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn--sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.difficulty-selector {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.difficulty-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  text-align: left;
  cursor: pointer;
}

.difficulty-btn .difficulty-label {
  font-weight: var(--font-weight-bold);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.difficulty-btn .difficulty-badge {
  font-size: var(--font-size-xs);
  min-width: 0;
  opacity: 0.8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.difficulty-btn.active {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-color: var(--color-primary);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

.card--elevated {
  box-shadow: var(--shadow-lg);
}

.card--interactive {
  transition: all var(--transition-normal);
}

.card--interactive:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  width: 100%;
  min-height: var(--option-height);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-align: left;
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.option:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-surface-hover);
}

.option:active:not(:disabled) {
  transform: scale(0.98);
}

.option:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.option--correct {
  border-color: var(--color-success);
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

.option--wrong {
  border-color: var(--color-danger);
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
}

.option--disabled {
  opacity: 0.6;
  pointer-events: none;
}

.option__letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

#screen-gameplay .progress {
  display: none;
}

.option--correct .option__letter {
  background: var(--color-success);
  color: var(--color-text-inverse);
}

.option--wrong .option__letter {
  background: var(--color-danger);
  color: var(--color-text-inverse);
}

.option__text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.progress {
  width: 100%;
  height: 6px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
  width: 0%;
}

.timer-ring {
  position: relative;
  width: var(--timer-ring-size);
  height: var(--timer-ring-size);
  flex-shrink: 0;
}

.timer-ring__svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-ring__bg {
  fill: none;
  stroke: var(--color-border);
  stroke-width: var(--timer-ring-stroke);
}

.timer-ring__progress {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: var(--timer-ring-stroke);
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset var(--transition-fast), stroke var(--transition-fast);
}

.timer-ring--warning .timer-ring__progress {
  stroke: var(--color-warning);
}

.timer-ring--danger .timer-ring__progress {
  stroke: var(--color-danger);
}

.timer-ring__label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.score-display {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.score-display__label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.score-display__value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
  line-height: var(--line-height-tight);
  color: var(--color-primary);
}

.streak-display {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.streak-display__icon {
  color: var(--color-warning);
  animation: pulse 1s ease-in-out infinite;
}

.streak-display__value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-warning);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
  20%, 40%, 60%, 80% { transform: translateX(4px); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.animate-fade-in {
  animation: fadeIn var(--transition-normal) ease forwards;
}

.animate-slide-up {
  animation: slideUp var(--transition-normal) ease forwards;
}

.animate-slide-down {
  animation: slideDown var(--transition-normal) ease forwards;
}

.animate-scale-in {
  animation: scaleIn var(--transition-fast) ease forwards;
}

.animate-shake {
  animation: shake 0.5s ease;
}

.flag-container {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 16 / 10;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  box-shadow: none;
}

.flag-container img,
.flag-img,
.flag-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.question-counter {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.question-counter__current {
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.question-counter__separator {
  color: var(--color-text-muted);
}

.question-counter__total {
  color: var(--color-text-secondary);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-index-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  backdrop-filter: blur(4px);
}

.modal__content {
  position: relative;
  width: 100%;
  max-width: 400px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal.active .modal__content {
  transform: scale(1);
}

.modal__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.modal__text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  line-height: var(--line-height-relaxed);
}

.modal__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--color-background);
  border-radius: var(--radius-md);
}

.modal__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.modal__stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.modal__stat-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.modal__actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  z-index: var(--z-index-toast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: all var(--transition-normal);
}

.toast.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast--success { border-color: var(--color-success); }
.toast--error { border-color: var(--color-danger); }
.toast--info { border-color: var(--color-primary); }

.toast__icon {
  flex-shrink: 0;
}

.toast__text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 479px) {
  .screen__header,
  .screen__content,
  .screen__footer {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .modal__content {
    padding: var(--spacing-lg);
  }

  .modal__stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
}

@media (min-width: 768px) {
  .screen__content {
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

  .options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    width: 100%;
    max-width: 560px;
  }
}

@media (min-width: 1024px) {
  .screen__content {
    max-width: 720px;
  }

  .options-grid {
    max-width: 680px;
  }
}

.options-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  width: 100%;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}