:root {
  --primary-color: #3498db;
  --secondary-color: #2c3e50;
  --success-color: #a8e6cf;
  --error-color: #ffb3b3;
  --warning-color: #f39c12;
  --info-color: #3498db;
  --background-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  background: var(--background-gradient);
  margin: 0;
  padding: 20px;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background-color: rgba(255, 255, 255, 0.95);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

h1 {
  color: var(--secondary-color);
  margin-bottom: 30px;
  font-size: 2.5em;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

h1 i {
  margin-right: 10px;
  color: var(--primary-color);
}

.game-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 20px;
}

#stats {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 20px 0;
  font-size: 1.2em;
  color: var(--secondary-color);
}

#stats > div {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
}

#stats > div:hover {
  transform: translateY(-2px);
}

.crossword-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

#crossword {
  display: grid;
  gap: 1px;
  background: var(--secondary-color);
  padding: 2px;
  border-radius: 4px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.cell {
  width: 40px;
  height: 40px;
  background: white;
  position: relative;
  transition: all 0.3s ease;
}

.cell.black {
  background: var(--secondary-color);
}

.cell-number {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 10px;
  color: #666;
  z-index: 1;
}

.cell input {
  width: 100%;
  height: 100%;
  text-align: center;
  border: none;
  font-size: 20px;
  text-transform: uppercase;
  background: transparent;
}

.cell input:focus {
  outline: none;
  background: #e8f4fc;
}

.cell.highlighted {
  background: #e8f4fc;
}

.cell.correct {
  background: var(--success-color);
  animation: pulse-success 0.5s;
}

.cell.incorrect {
  background: var(--error-color);
  animation: shake 0.5s;
}

@keyframes pulse-success {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

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

.controls {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 20px 0;
}

.btn {
  padding: 10px 20px;
  font-size: 16px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  color: white;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn i {
  font-size: 1.2em;
}

.btn.primary { background: var(--primary-color); }
.btn.success { background: #27ae60; }
.btn.warning { background: var(--warning-color); }
.btn.info { background: var(--info-color); }

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

select {
  padding: 10px;
  font-size: 16px;
  border-radius: 5px;
  border: 1px solid #ddd;
  cursor: pointer;
}

.clues-container {
  text-align: left;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 10px;
  max-height: 600px;
  overflow-y: auto;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.clue-list h3 {
  color: var(--secondary-color);
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.clue-item {
  margin: 10px 0;
  padding: 8px;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.clue-item:hover {
  background: #e8f4fc;
  transform: translateX(5px);
}

.clue-item.active {
  background: #e8f4fc;
  font-weight: bold;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.celebration-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
}

@keyframes confetti {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(100vh) rotate(720deg); }
}

.hint-popup {
  position: absolute;
  background: white;
  padding: 10px;
  border-radius: 5px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  animation: popup 0.3s ease-out;
}

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

.error-message {
  background-color: #ffebee;
  color: #c62828;
  padding: 15px;
  border-radius: 5px;
  margin: 10px 0;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.3s ease-out;
}

.error-message:before {
  content: '⚠️';
  font-size: 1.2em;
}

.error-message.visible {
  display: block;
}

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

.loading {
  opacity: 0.5;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 30px;
  height: 30px;
  margin: -15px 0 0 -15px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #3498db;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.cell input:invalid {
  border: 2px solid #ffb3b3;
}

.cell input.warning {
  animation: warning-pulse 0.5s ease-in-out;
}

@keyframes warning-pulse {
  0% { background-color: transparent; }
  50% { background-color: #fff3cd; }
  100% { background-color: transparent; }
}