/**
 * Component Styles - Browser-compatible CSS
 * All component styles using BEM naming convention
 * Block__Element--Modifier pattern
 */

/* ===================================================================
   WordButton Component
   =================================================================== */

/* Base Button */
.word-button {
  /* Square cells using modern aspect-ratio */
  aspect-ratio: 1 / 1;
  min-height: 80px; /* Minimum touch target for mobile */
  width: 100%;

  /* Visual styling */
  border: 2px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-button-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);

  /* Typography */
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  color: var(--color-text);

  /* Interaction */
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;

  /* Layout */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm);

  /* Text overflow handling */
  overflow: hidden;
  text-overflow: ellipsis;
  word-wrap: break-word;

  /* Smooth transitions */
  transition:
    transform var(--duration-transition) ease,
    box-shadow var(--duration-transition) ease,
    opacity var(--duration-transition) ease,
    background-color var(--duration-transition) ease,
    border-color var(--duration-transition) ease;

  /* GPU acceleration hint for smoother animations */
  will-change: transform;
}

/* Hover State */
.word-button:hover:not(:disabled):not(.merged) {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

/* Focus State */
.word-button:focus-visible {
  outline: 2px solid var(--color-selected);
  outline-offset: 2px;
}

/* Active State */
.word-button:active:not(:disabled):not(.merged) {
  transform: translateY(0);
}

/* Selected State */
.word-button.selected {
  border-color: var(--color-selected);
  background: var(--color-selected-bg);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
  transform: scale(1.05);
}

/* Merged State - Incomplete merged buttons should be clickable */
.word-button.merged {
  opacity: 0.7;
  background: var(--color-merged-bg);
  font-weight: 700;
  cursor: pointer; /* Clickable until complete */
  pointer-events: auto; /* Allow clicks */
}

.word-button.merged:not(.complete):hover {
  opacity: 0.85;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Complete State - Only disable when category is fully merged */
.word-button.merged.complete {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.word-button.complete {
  opacity: 0.85;
}

/* Disabled State */
.word-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Tablet (600px+) */
@media (min-width: 600px) {
  .word-button {
    min-height: 100px;
    font-size: 1rem;
    padding: var(--spacing-md);
  }
}

/* Desktop (900px+) */
@media (min-width: 900px) {
  .word-button {
    min-height: 120px;
    font-size: 1.125rem;
    padding: var(--spacing-lg);
  }
}

/* Landscape mobile optimization */
@media (max-height: 600px) and (orientation: landscape) {
  .word-button {
    min-height: 60px;
    font-size: 0.75rem;
    padding: var(--spacing-xs);
  }
}

/* ===================================================================
   GameBoard Component
   =================================================================== */

/* Game Board Container */
.game-board {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Grid Layout (Mobile-First) */
.word-grid {
  display: grid;
  gap: var(--spacing-md);
  width: 100%;

  /* Mobile: 2 columns */
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: auto;
}

/* Tablet (600px+): 4 columns */
@media (min-width: 600px) {
  .word-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
  }
}

/* Desktop (900px+): Constrained width */
@media (min-width: 900px) {
  .game-board {
    max-width: 800px;
  }

  .word-grid {
    gap: 1.25rem;
  }
}

/* Landscape mobile optimization */
@media (max-height: 600px) and (orientation: landscape) {
  .word-grid {
    gap: var(--spacing-sm);
  }
}

/* ===================================================================
   ScoreDisplay Component
   =================================================================== */

/* Container */
.score-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2xl);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  background: var(--color-button-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Score Item */
.score-display__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Label */
.score-display__label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Value */
.score-display__value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

/* Mobile optimization */
@media (max-width: 480px) {
  .score-display {
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
  }

  .score-display__value {
    font-size: 1.75rem;
  }

  .score-display__label {
    font-size: 0.75rem;
  }
}

/* Tablet and up */
@media (min-width: 600px) {
  .score-display {
    gap: var(--spacing-2xl);
  }

  .score-display__item {
    flex-direction: row;
    gap: var(--spacing-sm);
  }

  .score-display__label {
    font-size: 1rem;
  }

  .score-display__value {
    font-size: 2.25rem;
  }
}

/* ===================================================================
   VictoryScreen Component
   =================================================================== */

/* Overlay */
.victory-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  display: none; /* Hidden by default, shown via showVictoryScreen() */
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-lg);
  backdrop-filter: blur(4px);
}

/* Modal Container */
.victory-screen__modal {
  background: var(--color-button-bg);
  padding: var(--spacing-2xl);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  text-align: center;
  max-width: 400px;
  width: 100%;
  transform: scale(0.9);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Victory Appear Animation */
.victory-screen__modal--appear {
  animation: victoryFade 0.6s ease-out forwards;
}

@keyframes victoryFade {
  0% {
    opacity: 0;
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Title */
.victory-screen__title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #10b981; /* Success green */
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

/* Message */
.victory-screen__message {
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-xl);
  line-height: 1.5;
}

/* Stats Container */
.victory-screen__stats {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--color-bg);
  border-radius: 8px;
}

/* Stat Item */
.victory-screen__stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

/* Stat Label */
.victory-screen__stat-label {
  font-size: 1rem;
  color: var(--color-text-light);
  font-weight: 500;
}

/* Stat Value */
.victory-screen__stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
}

/* Play Again Button */
.victory-screen__button {
  background: var(--color-selected);
  color: #ffffff;
  padding: var(--spacing-md) var(--spacing-2xl);
  border-radius: 8px;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  transition:
    background-color 0.2s ease,
    transform 0.1s ease,
    box-shadow 0.2s ease;
}

.victory-screen__button:hover {
  background: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.victory-screen__button:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.victory-screen__button:focus-visible {
  outline: 2px solid var(--color-selected);
  outline-offset: 2px;
}

/* Mobile Optimization */
@media (max-width: 600px) {
  .victory-screen__modal {
    padding: var(--spacing-xl);
  }

  .victory-screen__title {
    font-size: 2rem;
  }

  .victory-screen__message {
    font-size: 1rem;
  }

  .victory-screen__stat-label {
    font-size: 0.875rem;
  }

  .victory-screen__stat-value {
    font-size: 1.25rem;
  }

  .victory-screen__button {
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-xl);
  }
}

/* Tablet and up */
@media (min-width: 600px) {
  .victory-screen__stats {
    gap: var(--spacing-lg);
  }
}

/* ===================================================================
   DifficultySelector Component
   =================================================================== */

/* Container */
.difficulty-selector {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-md) 0;
}

.difficulty-selector__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* Grid Layout */
.difficulty-selector__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  width: 100%;
}

/* Difficulty Button */
.difficulty-selector__button {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-button-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition:
    transform var(--duration-transition) ease,
    box-shadow var(--duration-transition) ease,
    border-color var(--duration-transition) ease,
    background-color var(--duration-transition) ease;
  text-align: left;
  width: 100%;
}

.difficulty-selector__button:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
  border-color: var(--color-selected);
}

.difficulty-selector__button:focus-visible {
  outline: 2px solid var(--color-selected);
  outline-offset: 2px;
}

.difficulty-selector__button:active {
  transform: translateY(0);
}

/* Selected State */
.difficulty-selector__button--selected {
  border-color: var(--color-selected);
  background: var(--color-selected-bg);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.difficulty-selector__button--selected .difficulty-selector__level-name {
  color: var(--color-selected);
}

/* Button Content */
.difficulty-selector__header {
  width: 100%;
  margin-bottom: var(--spacing-md);
}

.difficulty-selector__level-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  transition: color var(--duration-transition) ease;
}

.difficulty-selector__details {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.difficulty-selector__detail-item {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.5;
}

.difficulty-selector__detail-item strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Tablet (600px+) */
@media (min-width: 600px) {
  .difficulty-selector__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
  }

  .difficulty-selector__button {
    padding: var(--spacing-xl);
  }

  .difficulty-selector__title {
    font-size: 1.5rem;
  }

  .difficulty-selector__level-name {
    font-size: 1.75rem;
  }

  .difficulty-selector__detail-item {
    font-size: 1rem;
  }
}

/* Desktop (900px+) */
@media (min-width: 900px) {
  .difficulty-selector__button {
    padding: var(--spacing-2xl);
  }

  .difficulty-selector__level-name {
    font-size: 2rem;
  }
}

/* Mobile landscape optimization */
@media (max-height: 600px) and (orientation: landscape) {
  .difficulty-selector {
    padding: var(--spacing-sm) 0;
  }

  .difficulty-selector__title {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
  }

  .difficulty-selector__button {
    padding: var(--spacing-md);
  }

  .difficulty-selector__level-name {
    font-size: 1.125rem;
  }

  .difficulty-selector__detail-item {
    font-size: 0.75rem;
  }
}

/* ===================================================================
   LanguageSelector Component
   =================================================================== */

.language-selector {
  display: inline-flex;
  gap: 0;
  background: var(--color-bg);
  border-radius: 8px;
  padding: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.language-selector__button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.language-selector__button:hover {
  color: var(--color-text);
  background: rgba(0, 0, 0, 0.05);
}

.language-selector__button:focus-visible {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

.language-selector__button--active {
  background: white;
  color: var(--color-text);
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.language-selector__button--active:hover {
  background: white;
  cursor: default;
}

.language-selector__flag {
  font-size: 1.25rem;
  line-height: 1;
}

.language-selector__label {
  user-select: none;
}

/* Mobile responsive */
@media (max-width: 600px) {
  .language-selector {
    width: 100%;
    justify-content: center;
  }

  .language-selector__button {
    flex: 1;
    justify-content: center;
    padding: 10px 12px;
  }
}

/* Dark mode support (if implemented) */
@media (prefers-color-scheme: dark) {
  .language-selector {
    background: rgba(255, 255, 255, 0.1);
  }

  .language-selector__button:hover {
    background: rgba(255, 255, 255, 0.15);
  }

  .language-selector__button--active {
    background: rgba(255, 255, 255, 0.2);
  }

  .language-selector__button--active:hover {
    background: rgba(255, 255, 255, 0.2);
  }
}

/* ===================================================================
   StartScreen Component
   =================================================================== */

/* Container */
.start-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  min-height: 100vh;
}

/* Title */
.start-screen__title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.start-screen__subtitle {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-light);
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  line-height: 1.5;
}

/* Language Selector */
.start-screen__language-selector {
  margin-bottom: var(--spacing-2xl);
}

/* Start Button */
.start-screen__button {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1.125rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--color-text-light);
  border: none;
  border-radius: 12px;
  cursor: not-allowed;
  transition:
    background-color var(--duration-transition) ease,
    transform var(--duration-transition) ease,
    box-shadow var(--duration-transition) ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  min-width: 200px;
}

.start-screen__button--enabled {
  background: var(--color-selected);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.start-screen__button--enabled:hover {
  background: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.start-screen__button--enabled:focus-visible {
  outline: 2px solid var(--color-selected);
  outline-offset: 2px;
}

.start-screen__button--enabled:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.start-screen__button:disabled {
  opacity: 0.5;
}

/* Tablet (600px+) */
@media (min-width: 600px) {
  .start-screen {
    padding: var(--spacing-2xl);
  }

  .start-screen__title {
    font-size: 2.5rem;
  }

  .start-screen__subtitle {
    font-size: 1.125rem;
  }

  .start-screen__button {
    padding: var(--spacing-xl) calc(var(--spacing-2xl) * 1.5);
    font-size: 1.25rem;
    min-width: 250px;
  }
}

/* Desktop (900px+) */
@media (min-width: 900px) {
  .start-screen__title {
    font-size: 3rem;
  }

  .start-screen__subtitle {
    font-size: 1.25rem;
  }
}

/* Mobile landscape optimization */
@media (max-height: 600px) and (orientation: landscape) {
  .start-screen {
    padding: var(--spacing-md);
    min-height: auto;
  }

  .start-screen__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
  }

  .start-screen__subtitle {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-lg);
  }

  .start-screen__language-selector {
    margin-bottom: var(--spacing-lg);
  }

  .start-screen__button {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  .start-screen__button,
  .start-screen__button--enabled {
    transition: none;
  }

  .start-screen__button--enabled:hover {
    transform: none;
  }

  .start-screen__button--enabled:active {
    transform: none;
  }
}