:root {
  --color-primary: #2E86AB;
  --color-secondary: #A23B72;
  --color-accent: #F18F01;
  --color-text: #1f2121;
  --color-text-secondary: #626c71;
  --color-text-muted: #777c7c;
  --color-background: #fcfcf9;
  --color-surface: #ffffff;
  --color-border: rgba(0, 0, 0, 0.1);
  --color-border-light: rgba(0, 0, 0, 0.05);
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-success: #22c55e;
  --color-error: #ef4444;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --border-radius: 0.75rem;
  --border-radius-sm: 0.375rem;
  --spacing: 1rem;
  --spacing-sm: 0.5rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --transition: 200ms ease-in-out;
}

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

body {
  font-family: var(--font-family);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
}

.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-xl);
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing);
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--color-primary);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-left: var(--spacing-sm);
}

.search-container {
  position: relative;
  max-width: 400px;
  width: 100%;
}

.search-input {
  width: 100%;
  padding: var(--spacing) var(--spacing-lg);
  padding-left: 2.5rem;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-surface);
  font-size: 1rem;
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.search-icon {
  position: absolute;
  left: var(--spacing);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.clear-search {
  position: absolute;
  right: var(--spacing);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--spacing-sm);
}

.main-container {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - 80px);
}

.sidebar {
  width: 300px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border-light);
  position: sticky;
  top: 80px;
  height: calc(100vh - 80px);
  overflow-y: auto;
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.category-stats {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.category-nav {
  padding: var(--spacing) 0;
}

.category-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--spacing);
  padding: var(--spacing) var(--spacing-lg);
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.category-item:hover {
  background: rgba(46, 134, 171, 0.1);
  color: var(--color-text);
}

.category-item.active {
  background: rgba(46, 134, 171, 0.15);
  color: var(--color-primary);
  font-weight: 600;
  border-right: 3px solid var(--color-primary);
}

.category-item .count {
  margin-left: auto;
  background: var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  font-weight: 500;
}

.category-item.active .count {
  background: var(--color-primary);
  color: white;
}

.category-divider {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--spacing) var(--spacing-lg);
}

.sidebar-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border-light);
  margin-top: auto;
}

.help-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing);
}

.help-section ul {
  list-style: none;
}

.help-section li {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.help-section kbd {
  background: #f0f0f0;
  padding: 0.125rem 0.25rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.main-content {
  flex: 1;
  padding: var(--spacing-xl);
}

.content-header {
  margin-bottom: var(--spacing-xl);
}

.content-header h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.content-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.prompts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: var(--spacing-lg);
}

.prompt-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.prompt-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  border-color: var(--color-primary);
}

.prompt-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing);
}

.prompt-category {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.favorite-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
}

.favorite-btn:hover {
  color: var(--color-error);
}

.favorite-btn.active {
  color: var(--color-error);
}

.prompt-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing);
  line-height: 1.3;
}

.prompt-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing);
  line-height: 1.6;
}

.prompt-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing);
}

.prompt-role,
.prompt-audience {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.prompt-card-footer {
  display: flex;
  gap: var(--spacing);
}

.copy-btn,
.view-btn {
  flex: 1;
  padding: var(--spacing) var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.copy-btn:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.view-btn:hover {
  background: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing);
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.modal-title h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.close-modal {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--spacing-sm);
  font-size: 1.125rem;
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.detail-section {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing);
  border-bottom: 1px solid var(--color-border-light);
}

.detail-section:last-child {
  border-bottom: none;
}

.detail-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.detail-section h4 i {
  color: var(--color-primary);
}

.prompt-text {
  background: #1a1a1a;
  color: #f5f5f5;
  border-radius: var(--border-radius-sm);
  padding: var(--spacing);
  margin-top: var(--spacing);
  overflow-x: auto;
}

.prompt-text pre {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  white-space: pre-wrap;
  margin: 0;
}

.modal-footer {
  display: flex;
  gap: var(--spacing);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border-light);
  background: #f8f9fa;
}

.copy-full-btn {
  flex: 1;
  padding: var(--spacing) var(--spacing-lg);
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.copy-full-btn:hover {
  background: #1a5f7a;
}

.modal-footer .favorite-btn {
  padding: var(--spacing) var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background: white;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.modal-footer .favorite-btn.active {
  background: var(--color-error);
  color: white;
  border-color: var(--color-error);
}

.loading-state,
.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: var(--color-text-secondary);
  text-align: center;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing);
}

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

.empty-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing);
}

.notification {
  position: fixed;
  top: var(--spacing);
  right: var(--spacing);
  background: var(--color-surface);
  padding: var(--spacing) var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: var(--spacing);
  transform: translateX(100%);
  transition: var(--transition);
  z-index: 1100;
  border-left: 4px solid var(--color-success);
}

.notification.show {
  transform: translateX(0);
}

.notification-error {
  border-left-color: var(--color-error);
}

.notification-success i {
  color: var(--color-success);
}

.notification-error i {
  color: var(--color-error);
}

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing);
}

.footer-section p {
  color: var(--color-text-secondary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

@media (max-width: 1024px) {
  .header-content {
    flex-direction: column;
    gap: var(--spacing);
  }

  .main-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: static;
  }

  .prompts-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

@media (max-width: 640px) {
  .main-content {
    padding: var(--spacing);
  }

  .prompts-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing);
  }

  .prompt-card {
    padding: var(--spacing);
  }

  .prompt-card-footer {
    flex-direction: column;
  }

  .modal-content {
    margin: var(--spacing-sm);
  }
}