/**
 * Version Notes:
 * File: /public/css/canvas.css
 * Version: 0.0.1
 * Last Modified: 2026-03-22 04:05 PM
 * Changes:
 * - Initial canvas panel styles
 */

/* ═══ CANVAS PANEL ═══ */
#canvas-panel {
  display: none;
  width: 480px;
  min-width: 320px;
  max-width: 60vw;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  flex-shrink: 0;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  z-index: 10;
}
#canvas-panel.visible {
  display: flex;
}

/* Resize handle */
.canvas-resize {
  position: absolute;
  left: -3px;
  top: 0;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: 20;
  background: transparent;
}
.canvas-resize:hover,
.canvas-resize.dragging {
  background: var(--accent);
  opacity: 0.5;
}

/* Header */
.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  gap: 8px;
  flex-shrink: 0;
}
.canvas-header-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.canvas-header-actions {
  display: flex;
  gap: 4px;
}
.canvas-header-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s;
}
.canvas-header-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.canvas-header-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Tabs */
.canvas-tabs {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  scrollbar-width: thin;
  flex-shrink: 0;
}
.canvas-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 12px;
  color: var(--text-secondary);
  border-right: 1px solid var(--border);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  position: relative;
  flex-shrink: 0;
}
.canvas-tab:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.canvas-tab.active {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-bottom: 2px solid var(--accent);
}
.canvas-tab-lang {
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 3px;
  background: rgba(139, 92, 246, 0.15);
  color: #a78bfa;
  font-weight: 600;
  text-transform: uppercase;
}
.canvas-tab-close {
  margin-left: 4px;
  opacity: 0.4;
  cursor: pointer;
  font-size: 14px;
}
.canvas-tab-close:hover {
  opacity: 1;
  color: #ef4444;
}
.canvas-tab-badge {
  font-size: 9px;
  padding: 1px 4px;
  border-radius: 3px;
  font-weight: 700;
  text-transform: uppercase;
}
.canvas-tab-badge.new {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
}
.canvas-tab-badge.modified {
  background: rgba(251, 146, 60, 0.15);
  color: #fb923c;
}

/* File action bar */
.canvas-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.canvas-action-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.canvas-action-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.canvas-action-btn.save-btn {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #fff;
  border-color: transparent;
  font-weight: 600;
}
.canvas-action-btn.save-btn:hover {
  opacity: 0.9;
}
.canvas-action-btn.saved {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
  border-color: #22c55e;
}
.canvas-file-path {
  flex: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.canvas-file-path-input {
  flex: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 8px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
}
.canvas-status {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}
.canvas-status.pending { color: var(--text-dim); }
.canvas-status.saved { color: #22c55e; }
.canvas-status.error { color: #ef4444; }

/* Code view */
.canvas-code-area {
  flex: 1;
  overflow: auto;
  position: relative;
}
.canvas-code-area pre {
  margin: 0;
  padding: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  background: var(--bg-primary) !important;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-wrap: break-word;
  min-height: 100%;
}
.canvas-code-area code {
  background: transparent !important;
}

/* Line numbers */
.canvas-line-numbers {
  position: absolute;
  left: 0;
  top: 0;
  padding: 14px 0;
  width: 40px;
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
  opacity: 0.4;
  user-select: none;
  pointer-events: none;
}
.canvas-code-area.with-lines pre {
  padding-left: 52px;
}

/* Diff view */
.canvas-diff-area {
  flex: 1;
  overflow: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.6;
  padding: 14px;
}
.diff-line-add {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
}
.diff-line-remove {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}
.diff-line-context {
  color: var(--text-dim);
}

/* Empty state */
.canvas-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  color: var(--text-dim);
  text-align: center;
  padding: 40px;
  gap: 12px;
}
.canvas-empty-icon {
  font-size: 48px;
  opacity: 0.3;
}
.canvas-empty-text {
  font-size: 14px;
  max-width: 260px;
  line-height: 1.5;
}

/* Mode toggle */
.mode-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px;
  margin-left: 8px;
}
.mode-toggle-btn {
  padding: 4px 10px;
  border: none;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.2s;
}
.mode-toggle-btn.active {
  background: var(--accent);
  color: #fff;
}
.mode-toggle-btn:hover:not(.active) {
  color: var(--text-primary);
}

/* File browser */
.canvas-filetree {
  flex: 1;
  overflow: auto;
  padding: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}
.filetree-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background 0.1s;
}
.filetree-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.filetree-dir { font-weight: 600; color: var(--text-primary); }
.filetree-indent { margin-left: 16px; }

/* Canvas toggle button in header */
#toggle-canvas-btn {
  position: relative;
}
#toggle-canvas-btn .canvas-count {
  position: absolute;
  top: -4px;
  right: -4px;
  background: #ef4444;
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ═══ END OF FILE (FILENAME: /public/css/canvas.css) ═══ */