:root {
  --primary-color: #007AFF;
  --secondary-color: #5856D6;
  --background-color: #ffffff;
  --surface-color: #f8f9fa;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --border-color: #d1d1d6;
  --key-background: #f5f5f7;
  --key-border: #d1d1d6;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --transition: all 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #000000;
    --surface-color: #1c1c1e;
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --border-color: #38383a;
    --key-background: #2c2c2e;
    --key-border: #48484a;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

header .icon {
  font-size: 2.5rem;
}

header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.search-section {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

#search {
  flex: 1;
  min-width: 300px;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--surface-color);
  color: var(--text-primary);
  font-size: 16px;
  transition: var(--transition);
}

#search:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}


.categories {
  display: flex;
  gap: 8px;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.category-btn {
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--surface-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  white-space: nowrap;
}

.category-btn:hover {
  border-color: var(--primary-color);
}

.category-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

#shortcuts-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.shortcut-group {
  background: var(--surface-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.shortcut-group h3 {
  color: var(--primary-color);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-transform: capitalize;
}

.shortcut-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  gap: 1rem;
}

.shortcut-item:last-child {
  border-bottom: none;
}

.shortcut-keys {
  display: flex;
  gap: 4px;
  align-items: center;
  flex-shrink: 0;
  min-width: 140px;
  justify-content: flex-end;
}

.key {
  background: var(--key-background);
  border: 1px solid var(--key-border);
  border-radius: 4px;
  padding: 4px 8px;
  font-family: 'SF Pro', -apple-system, BlinkMacSystemFont, monospace;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  white-space: nowrap;
}

.key-separator {
  color: var(--text-secondary);
  font-weight: 300;
}

.shortcut-description {
  flex: 1;
  font-size: 15px;
  line-height: 1.4;
}

footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 14px;
}

.hidden {
  display: none;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  
  header h1 {
    font-size: 2rem;
  }
  
  #shortcuts-container {
    grid-template-columns: 1fr;
  }
  
  .shortcut-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .shortcut-keys {
    justify-content: flex-start;
    min-width: auto;
  }
  
  .categories {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 8px;
  }
  
  .search-section {
    flex-direction: column;
  }
  
  #search {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .shortcut-group {
    padding: 1rem;
  }
  
  .key {
    padding: 3px 6px;
    font-size: 13px;
  }
  
  .shortcut-description {
    font-size: 14px;
  }
}