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

:root {
  --toolbar-h: 52px;
  --status-h: 28px;
  --bg: #f0f2f7;
  --surface: #ffffff;
  --border: #d1d9e6;
  --accent: #1a73e8;
  --accent-hover: #1558b0;
  --text: #1e293b;
  --text-muted: #64748b;
  --line-default: #334155;
  --line-selected: #1a73e8;
  --handle-fill: #ffffff;
  --handle-stroke: #1a73e8;
  --label-bg: rgba(255,255,255,0.9);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Toolbar ──────────────────────────────────────────── */
#toolbar {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  user-select: none;
}

/* Row 1 */
#toolbar-primary {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 8px;
  height: 44px;
  overflow-x: auto;
  scrollbar-width: none;
  flex-shrink: 0;
}
#toolbar-primary::-webkit-scrollbar { display: none; }

/* Row 2 */
#toolbar-properties {
  display: flex;
  align-items: center;
  height: 38px;
  padding: 0 8px;
  background: #f8fafc;
  border-top: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
  flex-shrink: 0;
}
#toolbar-properties::-webkit-scrollbar { display: none; }

#properties-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
  white-space: nowrap;
}
#properties-controls {
  display: flex;
  align-items: stretch;
  gap: 0;
  height: 100%;
}

#line-controls,
#door-controls,
#dim-controls {
  display: flex;
  align-items: center;
  gap: 0;
  height: 100%;
}
#line-controls[hidden],
#door-controls[hidden],
#dim-controls[hidden] { display: none; }

/* Groups */
.tb-group {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 8px;
  border-right: 1px solid var(--border);
  height: 100%;
  flex-shrink: 0;
}
.tb-group-last,
.tb-group:last-child { border-right: none; }
.tb-spacer { flex: 1; min-width: 8px; border-right: none; padding: 0; }
.tb-label  { color: var(--text-muted); font-size: 12px; white-space: nowrap; }
.tb-divider { width: 1px; height: 18px; background: var(--border); margin: 0 4px; flex-shrink: 0; }

/* Tool buttons */
.tool-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.tool-btn:hover { background: var(--bg); color: var(--text); }
.tool-btn.active { background: #e8f0fe; color: var(--accent); border-color: #c5d8fc; }

/* ── Drawing-tool dropdown ────────────────────────────────────── */
.tool-dropdown {
  position: relative;
  display: flex;
  align-items: center;
}
.tool-dropdown-main {
  border-radius: 6px 0 0 6px !important;
  border-right: none !important;
  padding-right: 7px;
}
.tool-dropdown-main.active {
  border-right: 1px solid #aac4f7 !important;
}
.tool-dropdown-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 7px 5px;
  border: 1px solid transparent;
  border-left: 0;
  border-radius: 0 6px 6px 0;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 10px;
  line-height: 1;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  white-space: nowrap;
  height: 100%;
}
.tool-dropdown-chevron:hover { background: var(--bg); color: var(--text); }
.tool-dropdown.open .tool-dropdown-chevron,
.tool-dropdown-main.active + .tool-dropdown-chevron {
  background: #e8f0fe; color: var(--accent); border-color: #c5d8fc;
}
.tool-dropdown-menu {
  position: fixed;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.12);
  z-index: 1000;
  min-width: 130px;
  padding: 4px 0;
  animation: dropdown-in 0.1s ease;
}
@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.tool-dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 12px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  text-align: left;
  white-space: nowrap;
  transition: background 0.1s;
}
.tool-dropdown-item:hover { background: var(--bg); }
.tool-dropdown-item.active { color: var(--accent); font-weight: 600; }
.tool-dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}
.tool-dropdown-item kbd {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0 4px;
  font-family: inherit;
}
.tool-slot { display: flex; align-items: center; gap: 5px; }
.tool-slot[hidden] { display: none !important; }

/* ── Snap dropdown ───────────────────────────────────────────── */
.snap-dropdown {
  display: flex;
  align-items: center;
  gap: 2px;
}
.snap-dropdown-btn {
  padding: 3px 7px;
  border: 1px solid var(--border);
  border-radius: 6px 0 0 6px;
  background: var(--surface);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  min-width: 28px;
  text-align: center;
  transition: background 0.15s;
}
.snap-dropdown-btn:hover { background: var(--bg); }
.snap-dropdown .tool-dropdown-chevron { border-radius: 0 6px 6px 0; }
.snap-dropdown-menu { min-width: 110px; }
.tool-dropdown-item.snap-btn { gap: 6px; }
.tool-dropdown-item.snap-btn .snap-label { color: var(--text-muted); font-size: 11px; }
.tool-dropdown-item.snap-btn.active { color: var(--accent); font-weight: 600; }

/* Generic small button used in both rows */
.tb-btn, #toolbar button:not(.tool-btn):not(.snap-btn):not(.swatch):not(.style-btn):not(.toolbar-export button):not(.tool-dropdown-chevron):not(.tool-dropdown-item) {
  padding: 4px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  transition: background 0.15s;
}
.tb-btn:hover,
#toolbar button:not(.tool-btn):not(.snap-btn):not(.swatch):not(.style-btn):not(.toolbar-export button):not(.tool-dropdown-chevron):not(.tool-dropdown-item):hover {
  background: var(--bg);
}

/* Measure row inputs */
.toolbar-measure { gap: 5px; }
.toolbar-measure input {
  width: 60px;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
.toolbar-measure input:focus { border-color: var(--accent); }
.toolbar-measure input:disabled { opacity: 0.4; }

/* Toggle grid */
.toggle-label {
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 13px;
}

/* Style buttons (Dashed / Label) */
.style-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.style-btn:hover:not(:disabled) { background: var(--bg); color: var(--text); }
.style-btn.active { background: #e8f0fe; color: var(--accent); border-color: #c5d8fc; }
.style-btn:disabled { opacity: 0.4; cursor: default; }
#btn-toggle-label.label-hidden { text-decoration: line-through; }

/* Color swatches */
.toolbar-style { gap: 6px; }
.color-swatches { display: flex; align-items: center; gap: 3px; }
.swatch {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: transform 0.1s, border-color 0.1s;
}
.swatch:hover { transform: scale(1.2); }
.swatch.swatch-active { border-color: var(--accent); box-shadow: 0 0 0 1px #fff inset; }
#input-color {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border);
  padding: 0; cursor: pointer;
  background: none; overflow: hidden; flex-shrink: 0;
}
#input-color::-webkit-color-swatch-wrapper { padding: 0; }
#input-color::-webkit-color-swatch { border: none; border-radius: 50%; }

/* Snap selector */
.snap-btn-group {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.snap-btn {
  padding: 3px 7px;
  border: none;
  border-right: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.snap-btn:last-child { border-right: none; }
.snap-btn:hover { background: var(--bg); color: var(--text); }
.snap-btn.active { background: #e8f0fe; color: var(--accent); font-weight: 600; }

/* Zoom controls */
.toolbar-zoom { gap: 3px; }
.toolbar-zoom button {
  width: 24px; height: 24px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  color: var(--text);
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.toolbar-zoom button:last-child { width: auto; padding: 0 7px; font-size: 12px; }
.toolbar-zoom button:hover { background: var(--bg); }
#status-zoom {
  min-width: 38px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* Export */
.toolbar-export button {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s;
}
.toolbar-export button:hover { background: #e8f0fe; }

/* Hide text labels on narrow viewports */
@media (max-width: 680px) {
  .btn-label { display: none; }
  .tool-btn  { padding: 4px 7px; }
  .tb-label  { display: none; }
}


#main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

#canvas-wrapper {
  flex: 1;
  overflow: hidden;
  position: relative;
  min-width: 0;
}

#canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}
#canvas.mode-select { cursor: default; }

/* Lines */
.fl-line {
  stroke: var(--line-default);
  stroke-linecap: round;
  cursor: pointer;
  transition: stroke 0.1s;
  vector-effect: non-scaling-stroke;
}
.fl-line.selected { stroke: var(--line-selected); }
.fl-line:hover { stroke: var(--accent); }

/* Doors */
.fl-door { cursor: pointer; }
.fl-door-panel, .fl-door-open, .fl-door-arc, .fl-door-tick {
  fill: none;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}
.fl-door-panel { stroke-width: 2; }
.fl-door-open  { stroke-width: 1; stroke-dasharray: 4 3; opacity: 0.5; }
.fl-door-arc   { stroke-width: 1.5; }
.fl-door-tick  { stroke-width: 2; }
.fl-door-hit   { fill: transparent; stroke: transparent; cursor: pointer; }
.fl-door.door-selected .fl-door-panel,
.fl-door.door-selected .fl-door-arc,
.fl-door.door-selected .fl-door-tick { stroke: var(--line-selected); }
.fl-door:hover .fl-door-panel,
.fl-door:hover .fl-door-arc { stroke: var(--accent); }

/* Swing buttons (re-use snap-btn style) */
.swing-btn {
  padding: 3px 9px;
  border: none;
  border-right: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.swing-btn:last-child { border-right: none; }
.swing-btn:hover { background: var(--bg); color: var(--text); }
.swing-btn.active { background: #e8f0fe; color: var(--accent); font-weight: 600; }

/* Handles */
.fl-handle {
  fill: var(--handle-fill);
  stroke: var(--handle-stroke);
  stroke-width: 2;
  r: 5;
  cursor: grab;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}
.fl-handle:active { cursor: grabbing; }

/* Length labels */
.fl-label {
  font-size: 14px;
  fill: var(--text-muted);
  pointer-events: none;
  dominant-baseline: middle;
  text-anchor: middle;
}
.fl-label-bg {
  fill: var(--label-bg);
  rx: 3;
  pointer-events: none;
}

/* Preview line while drawing */
#preview-line {
  stroke: var(--accent);
  stroke-width: 2;
  stroke-dasharray: 6 4;
  stroke-linecap: round;
  pointer-events: none;
}
#preview-label { font-size: 11px; fill: var(--accent); pointer-events: none; dominant-baseline: middle; text-anchor: middle; }

/* Dimension lines */
.fl-dim { cursor: pointer; }
.fl-dim.dim-selected .fl-dim-line,
.fl-dim.dim-selected .fl-dim-ext,
.fl-dim.dim-selected .fl-dim-tick { stroke: var(--line-selected); }
.fl-dim:hover .fl-dim-line { stroke: var(--accent); }
#btn-dim-toggle-label.label-hidden { text-decoration: line-through; }

/* ── Status bar ───────────────────────────────────────── */
#status-bar {
  height: var(--status-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 24px;
  flex-shrink: 0;
  color: var(--text-muted);
  font-size: 12px;
}

#layers-panel {
  width: 220px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
}
#layers-panel[hidden] { display: none; }

#layers-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.layers-title { font-weight: 600; font-size: 13px; color: var(--text); }
#btn-new-layer {
  font-size: 12px;
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  cursor: pointer;
  color: var(--text);
}
#btn-new-layer:hover { background: #e8f0fe; color: var(--accent); }

#layers-list {
  flex: 1;
  overflow-y: auto;
  list-style: none;
  margin: 0;
  padding: 4px 0;
}

.layer-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  cursor: pointer;
  border-radius: 4px;
  margin: 1px 4px;
  transition: background 0.1s;
}
.layer-item:hover { background: var(--bg); }
.layer-item.active-layer { background: #e8f0fe; }

.layer-eye {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  cursor: pointer;
  opacity: 0.7;
  border: none;
  background: none;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.layer-eye:hover { opacity: 1; }
.layer-eye.hidden-layer { opacity: 0.3; }

.layer-color {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.layer-name {
  flex: 1;
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  outline: none;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
}
.layer-name:focus {
  background: white;
  border: 1px solid var(--accent);
  border-radius: 2px;
  padding: 0 2px;
  cursor: text;
}

.layer-count {
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg);
  border-radius: 8px;
  padding: 1px 5px;
  flex-shrink: 0;
}

#layers-active-indicator {
  padding: 6px 10px;
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* Multi-selection highlight */
.fl-line.multi-selected { stroke: #f97316 !important; }