.theme-system {
  --theme-primary: #3498db;
  --theme-secondary: #2ecc71;
  --theme-accent: #e74c3c;
  --theme-bg: #ffffff;
  --theme-surface: #f8f9fa;
  --theme-text: #2c3e50;
  --theme-text-secondary: #7f8c8d;
  --theme-border: #dee2e6;
  
  background: var(--theme-bg);
  color: var(--theme-text);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--theme-border);
  transition: all 0.3s ease;
}

.theme-system.dark {
  --theme-primary: #5dade2;
  --theme-secondary: #58d68d;
  --theme-accent: #ec7063;
  --theme-bg: #2c3e50;
  --theme-surface: #34495e;
  --theme-text: #ecf0f1;
  --theme-text-secondary: #bdc3c7;
  --theme-border: #4a5568;
}

.theme-card {
  background: var(--theme-surface);
  padding: 15px;
  margin: 15px 0;
  border-radius: 6px;
  border: 1px solid var(--theme-border);
}

.theme-button {
  background: var(--theme-primary);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  margin: 5px;
  transition: all 0.2s ease;
}

.theme-button:hover {
  opacity: 0.8;
  transform: translateY(-1px);
}

.theme-button.secondary {
  background: var(--theme-secondary);
}

.theme-button.accent {
  background: var(--theme-accent);
}

.theme-toggle {
  background: var(--theme-text);
  color: var(--theme-bg);
  border: 2px solid var(--theme-border);
  padding: 10px 20px;
  border-radius: 25px;
  cursor: pointer;
  font-weight: bold;
  margin-bottom: 20px;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  transform: scale(1.05);
}