/* Canvas Panel - Dark Theme Styling */

/* Canvas width - controlled by JS, stored in localStorage */
:root {
  --canvas-width: 500px;
  --canvas-min-width: 300px;
  --canvas-max-width: 900px;
}

/* Canvas is now inside .right-panel, positioned via flexbox */
/* Legacy .canvas-panel styles removed - using new .canvas class */

/* Resize Handle - Left edge of canvas */
.canvas-resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  background: transparent;
  z-index: 100;
  transition: background 0.15s ease;
}

.canvas-resize-handle:hover,
.canvas-resize-handle.active {
  background: var(--accent-blue);
}

/* Visual grip indicator */
.canvas-resize-handle::after {
  content: '';
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 40px;
  background: var(--text-muted);
  border-radius: 1px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.canvas-resize-handle:hover::after {
  opacity: 0.5;
}

/* Canvas Header */
.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.canvas-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

.canvas-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 20px;
  line-height: 1;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.canvas-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Canvas Tabs */
.canvas-tabs {
  display: flex;
  gap: 2px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  flex-shrink: 0;
}

.canvas-tabs:empty {
  display: none;
}

.canvas-tabs::-webkit-scrollbar {
  height: 4px;
}

.canvas-tabs::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 2px;
}

.canvas-tab {
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.canvas-tab:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.canvas-tab.active {
  background: var(--accent-blue);
  color: #000;
  border-color: var(--accent-blue);
  font-weight: 500;
}

/* Tab with close button layout */
.canvas-tab {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 8px 6px 12px;
}

.tab-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tab-close {
  opacity: 0.4;
  font-size: 16px;
  line-height: 1;
  padding: 2px 4px;
  border-radius: 3px;
  transition: opacity 0.15s, background 0.15s;
}

.tab-close:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.15);
}

.canvas-tab.active .tab-close {
  opacity: 0.6;
}

.canvas-tab.active .tab-close:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.2);
}

/* Canvas Content */
.canvas-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  font-size: 14px;
  line-height: 1.6;
}

.canvas-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 13px;
}

/* Markdown Preview Styling */
.canvas-content h1 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 16px 0;
  color: var(--text-primary);
  line-height: 1.3;
}

.canvas-content h2 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 12px 0;
  color: var(--text-primary);
  line-height: 1.3;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.canvas-content h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 20px 0 8px 0;
  color: var(--text-secondary);
  line-height: 1.3;
}

.canvas-content h4 {
  font-size: 14px;
  font-weight: 600;
  margin: 16px 0 6px 0;
  color: var(--text-secondary);
}

.canvas-content p {
  margin: 12px 0;
  color: var(--text-secondary);
}

.canvas-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.canvas-content em {
  font-style: italic;
  color: var(--text-secondary);
}

.canvas-content code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--accent-blue);
}

.canvas-content pre {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  overflow-x: auto;
  margin: 16px 0;
}

.canvas-content pre code {
  background: transparent;
  padding: 0;
  color: var(--text-secondary);
}

.canvas-content ul,
.canvas-content ol {
  margin: 12px 0;
  padding-left: 24px;
}

.canvas-content li {
  margin: 6px 0;
  color: var(--text-secondary);
}

.canvas-content li::marker {
  color: var(--text-muted);
}

.canvas-content blockquote {
  border-left: 3px solid var(--accent-blue);
  padding-left: 16px;
  margin: 16px 0;
  color: var(--text-muted);
  font-style: italic;
}

.canvas-content a {
  color: var(--accent-blue);
  text-decoration: none;
}

.canvas-content a:hover {
  text-decoration: underline;
}

.canvas-content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 24px 0;
}

.canvas-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 13px;
}

.canvas-content th {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 2px solid var(--border-color);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.canvas-content td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.canvas-content tr:last-child td {
  border-bottom: none;
}

/* Canvas Actions */
.canvas-actions {
  display: flex;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.canvas-btn {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.canvas-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.canvas-btn-primary {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #000;
}

.canvas-btn-primary:hover {
  background: var(--accent-blue-hover);
  border-color: var(--accent-blue-hover);
  color: #000;
}

/* Copy success feedback */
.canvas-btn.copied {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: #000;
}

/* Draft Type Badge */
.canvas-draft-type {
  display: inline-block;
  padding: 2px 8px;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  border-radius: 4px;
  margin-bottom: 12px;
}

.canvas-draft-type.pillar {
  background: rgba(74, 192, 255, 0.15);
  color: var(--accent-blue);
}

.canvas-draft-type.cluster {
  background: rgba(0, 230, 118, 0.15);
  color: var(--accent-green);
}

.canvas-draft-type.article {
  background: rgba(255, 213, 79, 0.15);
  color: var(--accent-yellow);
}

/* Word count display */
.canvas-word-count {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

/* ═══════════════════════════════════════════════════════════════
   SEO Metadata Panel
   ═══════════════════════════════════════════════════════════════ */

.canvas-metadata {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 13px;
}

.metadata-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.metadata-label {
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.5px;
}

.metadata-row {
  display: flex;
  gap: 8px;
  margin-bottom: 6px;
  line-height: 1.4;
}

.metadata-row:last-child {
  margin-bottom: 0;
}

.metadata-key {
  color: var(--text-secondary);
  flex-shrink: 0;
  min-width: 60px;
}

.metadata-value {
  color: var(--text-primary);
  word-break: break-word;
}

.metadata-slug {
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(0, 0, 0, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
}

.metadata-row--desc {
  flex-direction: column;
  gap: 4px;
}

.metadata-row--desc .metadata-value {
  font-size: 12px;
  opacity: 0.9;
}

/* ═══════════════════════════════════════════════════════════════
   Canvas Styles for Right Panel Tab System
   ═══════════════════════════════════════════════════════════════ */

/* Canvas in right panel uses flex layout from parent */
.canvas .canvas-content {
  flex: 1;
  overflow-y: auto;
}

/* Canvas draft tabs (when multiple drafts) */
.canvas-draft-tabs {
  display: flex;
  gap: 2px;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  flex-shrink: 0;
}

.canvas-draft-tabs:empty {
  display: none;
}

/* Canvas actions fixed at bottom */
.canvas .canvas-actions {
  flex-shrink: 0;
}

/* Canvas toggle button (for mobile/closed state) */
.canvas-toggle {
  position: fixed;
  bottom: 100px;
  right: 16px;
  width: 48px;
  height: 48px;
  background: var(--accent-blue);
  border: none;
  border-radius: 50%;
  color: #000;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(74, 192, 255, 0.3);
  transition: all 0.2s ease;
}

.canvas-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 16px rgba(74, 192, 255, 0.4);
}

.canvas-toggle.has-drafts {
  display: flex;
}

.canvas-toggle.has-drafts::after {
  content: attr(data-count);
  position: absolute;
  top: -4px;
  right: -4px;
  width: 20px;
  height: 20px;
  background: var(--accent-red);
  color: white;
  font-size: 11px;
  font-weight: 600;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Animation for new draft */
@keyframes draftPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(74, 192, 255, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(74, 192, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(74, 192, 255, 0);
  }
}

.canvas-tab.new {
  animation: draftPulse 1s ease-out;
}