:root {
  --panel-bg: #1B1B1E;
  --panel-bg-2: #202024;
  --panel-border: #2E2E33;
  --text-hi: #EDEBE5;
  --text-lo: #9A968E;
  --text-faint: #6C6963;
  --accent: #D9A441;
  --accent-2: #6C8DB5;
  --danger: #C2564B;
  --stage-frame: #232326;
  --row-hover: #26262B;
  --input-bg: #17171A;
  --input-border: #38383E;
  --radius: 2px;

  /* plan colours (fixed by spec, independent of UI theme) */
  --ink: #182E46;
  --floor: #F3EFE8;
  --muted: #9AA3AD;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--stage-frame);
  color: var(--text-hi);
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
}

.app {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ---------- Panel ---------- */

.panel {
  width: 320px;
  min-width: 320px;
  height: 100%;
  background: var(--panel-bg);
  border-right: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  padding: 18px 16px 12px;
  border-bottom: 1px solid var(--panel-border);
  flex: none;
}

.panel-header h1 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-hi);
}

.hint {
  margin: 0 0 8px;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--text-lo);
}
.hint.small { font-size: 10.5px; margin-top: 8px; margin-bottom: 0; }

.status-line {
  font-size: 11px;
  color: var(--accent-2);
  line-height: 1.4;
  min-height: 14px;
}
.status-line.error { color: var(--danger); }

.panel-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}
.panel-scroll::-webkit-scrollbar { width: 8px; }
.panel-scroll::-webkit-scrollbar-thumb { background: #3A3A40; border-radius: 4px; }
.panel-scroll::-webkit-scrollbar-track { background: transparent; }

.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--panel-border);
}

.panel-section h2 {
  margin: 0 0 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-lo);
  font-weight: 600;
}

.row-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  padding: 4px 0;
  cursor: pointer;
  user-select: none;
}
.row-check input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }

/* ---------- Unit list ---------- */

.unit-list {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.unit-row {
  border-radius: var(--radius);
  padding: 8px 9px;
  background: var(--panel-bg-2);
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 12.5px;
  transition: background 0.1s, border-color 0.15s;
}
.unit-row:hover { background: var(--row-hover); border-color: var(--input-border); }
.unit-row.active { border-color: var(--accent); background: var(--row-hover); }
.unit-row .u-main { color: var(--text-hi); font-weight: 500; }
.unit-row .u-sub { color: var(--text-faint); font-size: 10.5px; margin-top: 2px; }

/* ---------- Buttons ---------- */

.btn-full {
  display: block;
  width: 100%;
  text-align: center;
  padding: 8px 10px;
  margin-bottom: 8px;
  border-radius: var(--radius);
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-hi);
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
}
.btn-full:hover:not(:disabled) { border-color: var(--accent-2); color: var(--accent-2); }
.btn-full:last-child { margin-bottom: 0; }
.btn-full:disabled { opacity: 0.35; cursor: not-allowed; }

.sel-toolbar .btn-full { margin-bottom: 6px; }

.btn-toolbar {
  padding: 6px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-hi);
  cursor: pointer;
  font-family: inherit;
  font-size: 11.5px;
  flex: none;
}
.btn-toolbar:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Stage area ---------- */

.stage-wrap {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.top-bar {
  flex: none;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 14px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--panel-border);
}

.unit-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-hi);
  white-space: nowrap;
}

.spacer { flex: 1; }

.zoom-readout {
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  min-width: 40px;
  text-align: right;
}

/* ---------- Palette ---------- */

.palette {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  max-width: 55%;
}

.palette-item {
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  flex: none;
  position: relative;
}
.palette-item:hover { border-color: var(--accent); }
.palette-item:active { cursor: grabbing; }
.palette-item svg { width: 26px; height: 26px; display: block; overflow: visible; }
.palette-item svg path, .palette-item svg circle, .palette-item svg rect, .palette-item svg ellipse, .palette-item svg line {
  stroke: var(--muted);
  fill: none;
}
.palette-item svg .fill-floor { fill: var(--floor); }

/* ---------- Stage ---------- */

.stage {
  flex: 1;
  position: relative;
  background: var(--stage-frame);
  overflow: hidden;
  cursor: default;
}
.stage.panning { cursor: grab; }
.stage.panning-active { cursor: grabbing; }

.stage-viewport {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
}

.stage-viewport svg {
  display: block;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.4), 0 20px 60px rgba(0,0,0,0.5);
}

#stage-svg .obj { cursor: grab; }
#stage-svg .obj.selected { cursor: grab; }
#stage-svg .obj.dragging { cursor: grabbing; }
#stage-svg .obj path, #stage-svg .obj circle, #stage-svg .obj rect, #stage-svg .obj ellipse, #stage-svg .obj line, #stage-svg .obj polygon {
  vector-effect: non-scaling-stroke;
}

.select-outline {
  fill: none;
  stroke: var(--accent-2);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}
.select-handle {
  fill: #fff;
  stroke: var(--accent-2);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}
.snap-guide {
  stroke: var(--accent);
  stroke-width: 0.4;
  stroke-dasharray: 2,1.5;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}
.raw-overlay {
  pointer-events: none;
}
.raw-overlay path, .raw-overlay circle, .raw-overlay rect, .raw-overlay line {
  opacity: 0.4;
}

.dim-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(20,20,22,0.92);
  border: 1px solid var(--input-border);
  color: var(--text-hi);
  font-size: 11px;
  padding: 3px 7px;
  border-radius: var(--radius);
  white-space: nowrap;
  z-index: 5;
  transform: translate(-50%, -130%);
}
.dim-tooltip[hidden] { display: none; }

.empty-msg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px;
  color: var(--text-lo);
  font-size: 13px;
  line-height: 1.6;
  pointer-events: none;
}
.empty-msg[hidden] { display: none; }

.bottom-bar {
  flex: none;
  display: flex;
  align-items: center;
  padding: 6px 14px;
  background: var(--panel-bg);
  border-top: 1px solid var(--panel-border);
  font-size: 11px;
  color: var(--text-lo);
}

.row-slider { display: flex; align-items: center; gap: 8px; font-size: 12px; padding: 2px 0 6px; color: var(--muted, #9AA3AD); }
.row-slider input[type="range"] { flex: 1; accent-color: var(--accent); }
.row-check kbd, .btn-full kbd { margin-left: auto; font: 11px ui-monospace, monospace; padding: 1px 5px; border: 1px solid rgba(255,255,255,.25); border-radius: 2px; opacity: .7; }
#btn-flip { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
#layer-pdf image { image-rendering: auto; }

.stage-wrap.pencil, .stage-wrap.pencil * { cursor: crosshair !important; }
.stage-wrap.notetext, .stage-wrap.notetext * { cursor: text !important; }
#btn-pencil.is-on, #btn-note-text.is-on { background: #E0342B; border-color: #E0342B; color: #fff; }
.note-input { position: absolute; z-index: 30; font: 13px "DM Sans", system-ui, sans-serif; color: #E0342B; background: #fff; border: 1px solid #E0342B; border-radius: 2px; padding: 3px 6px; min-width: 140px; outline: none; }
#layer-notes { pointer-events: none; }

#btn-cad.is-on { background: #3B6EA8; border-color: #3B6EA8; color: #fff; }
.cad-legend { display: flex; flex-wrap: wrap; gap: 6px 12px; font-size: 11.5px; color: var(--muted, #9AA3AD); padding: 6px 0 2px; }
.cad-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }
#layer-cad path { cursor: pointer; }
#layer-cad .cad-hit { stroke: transparent; fill: none; stroke-width: 2.4px; vector-effect: non-scaling-stroke; }
#layer-cad .cad-hit:hover + path, #layer-cad path.cad-hover { filter: drop-shadow(0 0 1px #fff); }
.cad-menu { position: absolute; z-index: 40; background: #1E2228; border: 1px solid rgba(255,255,255,.18); border-radius: 2px; padding: 4px; display: flex; flex-direction: column; min-width: 160px; box-shadow: 0 8px 24px rgba(0,0,0,.4); }
.cad-menu button { background: none; border: 0; color: #E6E9ED; text-align: left; padding: 6px 8px; font: 12.5px "DM Sans", system-ui, sans-serif; cursor: pointer; border-radius: 2px; }
.cad-menu button:hover { background: rgba(255,255,255,.08); }
.cad-menu .sep { height: 1px; background: rgba(255,255,255,.12); margin: 4px 0; }
.stage-wrap.cad-on #layer-walls, .stage-wrap.cad-on #layer-objects { transition: opacity .15s; }

.cad-layers { max-height: 220px; overflow: auto; margin: 6px 0; border: 1px solid rgba(255,255,255,.1); border-radius: 2px; padding: 2px 6px; }
.cad-layer { font-size: 11.5px; padding: 2px 0; gap: 6px; }
.cad-layer span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cad-layer-kill { background: none; border: 1px solid rgba(255,255,255,.2); color: #E6E9ED; border-radius: 2px; width: 20px; height: 18px; font-size: 11px; cursor: pointer; padding: 0; }
.cad-layer-kill:hover { background: rgba(255,255,255,.1); }
.btn-row { display: flex; gap: 6px; } .btn-row .btn-full { flex: 1; }
#btn-hand.is-on { background: #6B7A90; border-color: #6B7A90; color: #fff; }
#btn-rebuild.is-dirty { background: #E38B2A; border-color: #E38B2A; color: #fff; }
#btn-vertices.is-on { background: #3B6EA8; border-color: #3B6EA8; color: #fff; }
#layer-handles rect { vector-effect: non-scaling-stroke; }