/* ============================================================
   Thread & Template — Drafting Canvas Styles
   ============================================================ */

.drafting-screen {
  display: flex;
  flex-direction: row;
  height: 100%;
}

/* --- Toolbar --- */
.drafting-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-bg-elevated);
  flex-shrink: 0;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-separator {
  width: 1px;
  height: 24px;
  background: var(--color-bg-elevated);
  margin: 0 4px;
}

.tool-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  background: none;
  color: var(--color-text-muted);
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tool-btn:hover {
  color: var(--color-text);
  background: var(--color-bg-elevated);
}

.tool-btn.active {
  color: var(--color-accent-light);
  background: var(--color-bg-elevated);
  border-color: var(--color-accent-dim);
}

/* --- SVG Canvas Area --- */
.drafting-canvas-area {
  flex: 7;
  position: relative;
  overflow: hidden;
  background: var(--color-bg-inset);
}

.drafting-canvas-area svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Preview Panel --- */
.drafting-preview-panel {
  flex: 3;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-surface);
  border-left: 1px solid var(--color-bg-elevated);
}

.preview-header {
  padding: 10px 12px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-bg-elevated);
}

.preview-canvas-wrapper {
  flex: 1;
  position: relative;
}

.preview-canvas-wrapper canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Validation Panel --- */
.validation-panel {
  padding: 10px 12px;
  border-top: 1px solid var(--color-bg-elevated);
  max-height: 120px;
  overflow-y: auto;
}

.validation-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
}

.validation-status.valid {
  color: var(--color-success);
}

.validation-status.invalid {
  color: var(--color-error);
}

.validation-error-list {
  list-style: none;
  margin-top: 6px;
}

.validation-error-list li {
  font-size: 11px;
  color: var(--color-error);
  padding: 2px 0;
  padding-left: 16px;
  position: relative;
}

.validation-error-list li::before {
  content: '\2022';
  position: absolute;
  left: 4px;
}

/* --- SVG Pattern Elements --- */
.pattern-piece {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1.5;
  cursor: pointer;
}

.pattern-piece:hover {
  stroke: var(--color-accent-light);
  stroke-width: 2;
}

.seam-allowance-path {
  fill: none;
  stroke: var(--color-seam);
  stroke-width: 0.5;
  stroke-dasharray: 4 2;
  opacity: 0.5;
}

.anchor-point {
  fill: var(--color-anchor);
  stroke: var(--color-bg);
  stroke-width: 1.5;
  cursor: grab;
  transition: r var(--transition-fast);
}

.anchor-point:hover,
.anchor-point.dragging {
  fill: var(--color-anchor-hover);
  r: 6;
  cursor: grabbing;
}

.anchor-point.curve-control {
  fill: none;
  stroke: var(--color-accent-dim);
  stroke-width: 1;
}

.grainline-arrow {
  stroke: var(--color-text-muted);
  stroke-width: 1;
  marker-end: url(#arrowhead);
  opacity: 0.6;
}

.measurement-annotation {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--color-text-muted);
}

/* --- Grid --- */
.grid-line {
  stroke: var(--color-grid);
  stroke-width: 0.5;
}

.grid-line.major {
  stroke: var(--color-grid-major);
  stroke-width: 1;
}