/* Full-Screen Tablet App */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  background: #1a202c;
  touch-action: manipulation;
  user-select: none;
}

.app-fullscreen {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}

/* Header */
.app-header {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  padding: 10px 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  flex-shrink: 0;
}

.icon-btn {
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
}

.header-info {
  flex: 1;
  text-align: center;
}

.level-text {
  color: white;
  font-size: 18px;
  font-weight: 700;
}

.header-stats {
  display: flex;
  gap: 10px;
}

.stat-item {
  background: rgba(255,255,255,0.2);
  padding: 8px 12px;
  border-radius: 20px;
  color: white;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Progress Bar */
.progress-bar-wrapper {
  background: rgba(255,255,255,0.95);
  padding: 8px 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: #e9ecef;
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #48bb78, #38a169);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 14px;
  font-weight: 600;
  color: #4a5568;
  min-width: 50px;
}

/* Grid Container */
.grid-container-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px;
  overflow: hidden;
  background: rgba(255,255,255,0.95);
}

.crossword-grid {
  display: grid;
  background: #a0aec0;
  padding: 6px;
  border-radius: 10px;
  gap: 2px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

/* Grid Cells */
.grid-cell {
  background: white;
  border: 2px solid #cbd5e0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-weight: bold;
  transition: all 0.2s;
  cursor: pointer;
}

.grid-cell.clue-cell {
  background: linear-gradient(135deg, #4a5568, #2d3748);
  color: white;
  padding: 4px;
  font-size: 10px;
  font-weight: 600;
  line-height: 1.2;
  text-align: left;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  overflow: hidden;
  cursor: default;
  pointer-events: none;
}

.clue-text {
  font-size: 10px;
  line-height: 1.2;
  word-wrap: break-word;
  width: 100%;
}

.arrow {
  position: absolute;
  color: #4299e1;
  font-weight: bold;
  font-size: 18px;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
}

.grid-cell.blocked-cell {
  background: #2d3748;
  border-color: #2d3748;
  cursor: default;
}

.grid-cell.letter-cell {
  background: white;
  font-size: 28px;
  color: #2d3748;
  cursor: pointer;
}

.grid-cell.letter-cell:hover {
  background: #f7fafc;
  border-color: #4299e1;
}

.grid-cell.letter-cell.active {
  background: #ebf8ff;
  border-color: #3182ce;
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.4);
}

.grid-cell.letter-cell.highlighted {
  background: #fef5e7;
  border-color: #f39c12;
}

.grid-cell.letter-cell.correct {
  background: #c6f6d5;
  border-color: #48bb78;
  animation: correctPulse 0.5s ease;
}

.grid-cell.letter-cell.incorrect {
  background: #fed7d7;
  border-color: #f56565;
  animation: shake 0.4s ease;
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

@keyframes wordComplete {
  0% { box-shadow: 0 0 0 0 rgba(72, 187, 120, 0.7); }
  100% { box-shadow: 0 0 0 20px rgba(72, 187, 120, 0); }
}

.word-complete {
  animation: wordComplete 0.8s ease;
}

/* On-Screen Keyboard */
.keyboard-area {
  background: #2d3748;
  padding: 12px 10px 10px 10px;
  flex-shrink: 0;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.2);
}

.keyboard-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 8px;
}

.key-btn {
  background: linear-gradient(135deg, #4a5568, #2d3748);
  border: none;
  color: white;
  min-width: 50px;
  height: 52px;
  border-radius: 8px;
  font-size: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.key-btn:active {
  transform: scale(0.95);
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.key-btn.key-action {
  background: linear-gradient(135deg, #ed8936, #dd6b20);
  min-width: 60px;
}

.key-btn.key-del {
  background: linear-gradient(135deg, #fc8181, #f56565);
  min-width: 60px;
}

.keyboard-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  justify-content: center;
}

.action-btn {
  background: linear-gradient(135deg, #48bb78, #38a169);
  border: none;
  color: white;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 3px 8px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

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

.action-btn.secondary {
  background: linear-gradient(135deg, #667eea, #764ba2);
}

/* Side Menu */
.side-menu {
  position: fixed;
  top: 0;
  left: -300px;
  width: 300px;
  height: 100vh;
  background: white;
  box-shadow: 2px 0 15px rgba(0,0,0,0.3);
  transition: left 0.3s ease;
  z-index: 1000;
}

.side-menu.active {
  left: 0;
}

.menu-header {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu-header h3 {
  font-size: 20px;
}

.close-menu {
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
}

.menu-items {
  padding: 15px 0;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 18px 20px;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.2s;
}

.menu-item:active {
  background: #f8f9fa;
}

.menu-item i {
  width: 24px;
  color: #4facfe;
  font-size: 20px;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  z-index: 2000;
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  max-width: 450px;
  width: 90%;
  box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}

.success-icon {
  font-size: 80px;
  color: #48bb78;
  margin-bottom: 20px;
  animation: bounce 1s ease;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-20px); }
  60% { transform: translateY(-10px); }
}

.modal-content h2 {
  color: #2d3748;
  margin-bottom: 12px;
  font-size: 28px;
}

.modal-content p {
  color: #4a5568;
  margin-bottom: 24px;
  font-size: 18px;
}

.btn-primary {
  background: linear-gradient(135deg, #48bb78, #38a169);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 16px 32px;
  cursor: pointer;
  font-weight: 600;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(72, 187, 120, 0.4);
}

.btn-primary:active {
  transform: scale(0.98);
}

/* Toast Notification */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.9);
  color: white;
  padding: 14px 28px;
  border-radius: 25px;
  font-size: 16px;
  font-weight: 600;
  z-index: 9999;
  animation: toastFade 2.5s ease;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

@keyframes toastFade {
  0%, 100% { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  15%, 85% { opacity: 1; transform: translateX(-50%) translateY(0); }
}