:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border-color: #e5e7eb;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
}

.dark {
  --bg-primary: #1f2937;
  --bg-secondary: #111827;
  --bg-tertiary: #374151;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --border-color: #374151;
}

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

body {
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
}

.font-mono {
  font-family: 'IBM Plex Mono', monospace;
}

.btn-primary {
  background-color: var(--accent-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: background-color 0.2s;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: background-color 0.2s;
}

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

input, textarea, select {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.card {
  background-color: var(--bg-primary);
  border-radius: 0.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.editor-mode-btn {
  transition: all 0.2s;
}

.editor-mode-btn.active {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.note-item {
  padding: 0.75rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

.note-item:hover {
  background-color: var(--bg-tertiary);
}

.note-item.active {
  background-color: var(--accent-color);
  color: white;
}

.note-item.active .note-meta {
  color: rgba(255, 255, 255, 0.8);
}

.note-title {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-preview {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 0.25rem;
}

.note-meta {
  font-size: 0.625rem;
  color: var(--text-tertiary);
  margin-top: 0.25rem;
}

.category-item {
  padding: 0.5rem;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background-color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-item:hover {
  background-color: var(--bg-tertiary);
}

.category-item.active {
  background-color: var(--bg-tertiary);
  font-weight: 500;
}

.category-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.prose {
  font-family: 'Space Grotesk', sans-serif;
  line-height: 1.75;
}

.prose h1, .prose h2, .prose h3, .prose h4, .prose h5, .prose h6 {
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  line-height: 1.3;
}

.prose h1 { font-size: 2em; }
.prose h2 { font-size: 1.5em; }
.prose h3 { font-size: 1.25em; }

.prose p {
  margin-bottom: 1em;
}

.prose code {
  font-family: 'IBM Plex Mono', monospace;
  background-color: var(--bg-tertiary);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-size: 0.875em;
}

.prose pre {
  background-color: var(--bg-tertiary);
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 1em 0;
}

.prose pre code {
  background: none;
  padding: 0;
}

.prose blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: 1rem;
  color: var(--text-secondary);
  margin: 1em 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}

.prose th, .prose td {
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  text-align: left;
}

.prose th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
}

.prose a {
  color: var(--accent-color);
  text-decoration: underline;
}

.prose a:hover {
  color: var(--accent-hover);
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 0.5rem;
}

.diff-added {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--success-color);
}

.diff-removed {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--danger-color);
  text-decoration: line-through;
}

.version-item {
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
}

.version-item:hover {
  border-color: var(--accent-color);
  background-color: var(--bg-tertiary);
}

.toast {
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  animation: slideIn 0.3s ease;
}

.toast-success {
  background-color: var(--success-color);
  color: white;
}

.toast-error {
  background-color: var(--danger-color);
  color: white;
}

.toast-warning {
  background-color: var(--warning-color);
  color: white;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.animate-spin {
  animation: spin 1s linear infinite;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal-content {
  background-color: var(--bg-primary);
  border-radius: 0.75rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 768px) {
  #sidebar {
    position: fixed;
    left: -100%;
    z-index: 40;
    transition: left 0.3s;
  }

  #sidebar.open {
    left: 0;
  }
}