* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
  padding: 1rem;
  transition: background 0.3s ease;
}

body.dark-mode {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #e0e0e0;
}

.game-container {
  max-width: 1400px;
  margin: 0 auto;
}

/* Header */
.game-header {
  background: rgba(255, 255, 255, 0.95);
  padding: 1.5rem;
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

body.dark-mode .game-header {
  background: rgba(30, 30, 46, 0.95);
}

.game-header h1 {
  font-size: 2rem;
  color: #667eea;
  margin: 0;
}

body.dark-mode .game-header h1 {
  color: #8b9bff;
}

.theme-btn,
.back-btn {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s ease;
}

.theme-btn {
  background: #667eea;
  color: white;
}

.theme-btn:hover {
  background: #5568d3;
  transform: translateY(-2px);
}

.back-btn {
  background: #48bb78;
  color: white;
}

.back-btn:hover {
  background: #38a169;
  transform: translateY(-2px);
}

/* Stats Panel */
.stats-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: rgba(255, 255, 255, 0.95);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  text-align: center;
}

body.dark-mode .stat-box {
  background: rgba(30, 30, 46, 0.95);
}

.stat-label {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  font-weight: 600;
}

body.dark-mode .stat-label {
  color: #a0a0c0;
}

.stat-value {
  font-size: 2rem;
  font-weight: bold;
  color: #667eea;
}

body.dark-mode .stat-value {
  color: #8b9bff;
}

/* Main Content */
.main-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

/* Clicker Section */
.clicker-section {
  background: rgba(255, 255, 255, 0.95);
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

body.dark-mode .clicker-section {
  background: rgba(30, 30, 46, 0.95);
}

.click-button {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #667eea, #764ba2);
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
}

.click-button:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 32px rgba(102, 126, 234, 0.6);
}

.click-button:active {
  transform: scale(0.95);
}

.click-text {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 0.5rem;
}

.click-power {
  font-size: 1.2rem;
  font-weight: bold;
  color: #667eea;
}

body.dark-mode .click-power {
  color: #8b9bff;
}

/* Upgrades and Automation */
.upgrades-section,
.automation-section {
  background: rgba(255, 255, 255, 0.95);
  padding: 1.5rem;
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

body.dark-mode .upgrades-section,
body.dark-mode .automation-section {
  background: rgba(30, 30, 46, 0.95);
}

.upgrades-section h2,
.automation-section h2 {
  margin-bottom: 1rem;
  color: #667eea;
}

body.dark-mode .upgrades-section h2,
body.dark-mode .automation-section h2 {
  color: #8b9bff;
}

.upgrade-grid,
.automation-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.upgrade-item,
.automation-item {
  background: rgba(102, 126, 234, 0.1);
  padding: 1rem;
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

body.dark-mode .upgrade-item,
body.dark-mode .automation-item {
  background: rgba(139, 155, 255, 0.1);
}

.upgrade-item:hover,
.automation-item:hover {
  background: rgba(102, 126, 234, 0.2);
}

.upgrade-info,
.automation-info {
  flex: 1;
}

.upgrade-name,
.automation-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.upgrade-desc,
.automation-desc {
  font-size: 0.85rem;
  color: #666;
}

body.dark-mode .upgrade-desc,
body.dark-mode .automation-desc {
  color: #a0a0c0;
}

.upgrade-btn,
.automation-btn {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 8px;
  background: #667eea;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.upgrade-btn:hover,
.automation-btn:hover {
  background: #5568d3;
  transform: translateY(-2px);
}

.upgrade-btn:disabled,
.automation-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
}

body.dark-mode .upgrade-btn:disabled,
body.dark-mode .automation-btn:disabled {
  background: #444;
}

.automation-count {
  font-size: 0.85rem;
  color: #667eea;
  margin-top: 0.25rem;
}

body.dark-mode .automation-count {
  color: #8b9bff;
}

/* Achievements */
.achievements-panel {
  background: rgba(255, 255, 255, 0.95);
  padding: 1.5rem;
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.5rem;
}

body.dark-mode .achievements-panel {
  background: rgba(30, 30, 46, 0.95);
}

.achievements-panel h2 {
  margin-bottom: 1rem;
  color: #667eea;
}

body.dark-mode .achievements-panel h2 {
  color: #8b9bff;
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.achievement-item {
  background: rgba(102, 126, 234, 0.1);
  padding: 1rem;
  border-radius: 10px;
  text-align: center;
  transition: all 0.3s ease;
  opacity: 0.5;
}

body.dark-mode .achievement-item {
  background: rgba(139, 155, 255, 0.1);
}

.achievement-item.unlocked {
  opacity: 1;
  background: rgba(72, 187, 120, 0.2);
}

.achievement-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.achievement-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.achievement-desc {
  font-size: 0.85rem;
  color: #666;
}

body.dark-mode .achievement-desc {
  color: #a0a0c0;
}

/* Footer */
.game-footer {
  background: rgba(255, 255, 255, 0.95);
  padding: 1.5rem;
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

body.dark-mode .game-footer {
  background: rgba(30, 30, 46, 0.95);
}

.action-btn {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  background: #667eea;
  color: white;
}

.action-btn:hover {
  transform: translateY(-2px);
}

.action-btn.danger {
  background: #e53e3e;
}

.action-btn.danger:hover {
  background: #c53030;
}

.save-info {
  color: #666;
  font-size: 0.85rem;
}

body.dark-mode .save-info {
  color: #a0a0c0;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .main-content {
    grid-template-columns: 1fr;
  }

  .game-header {
    flex-direction: column;
    text-align: center;
  }

  .stats-panel {
    grid-template-columns: 1fr;
  }

  .click-button {
    width: 150px;
    height: 150px;
  }

  .achievements-grid {
    grid-template-columns: 1fr;
  }
}

/* Animations */
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.click-button.clicked {
  animation: pulse 0.2s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.upgrade-item,
.automation-item,
.achievement-item {
  animation: slideIn 0.3s ease;
}