html, body { height: 100%; overflow: hidden; }
.app {
  display: grid;
  grid-template-rows: var(--toolbar-h) 1fr;
  grid-template-columns: var(--panel-w-min) 1fr var(--panel-w-wide);
  grid-template-areas: "top top top" "left canvas right";
  height: 100vh;
  background: var(--bg);
}

/* ---- Top app bar ---- */
.appbar { grid-area: top; display: flex; align-items: center; gap: var(--space-3); padding: 0 var(--space-3);
          background: var(--surface); border-bottom: var(--border-width) solid var(--border-subtle); }
.appbar .brand { display: flex; align-items: center; gap: var(--space-3); padding-right: var(--space-3); }
.appbar .brand .mark { font: var(--weight-semibold) var(--fs-18)/1 var(--font-serif); color: var(--fg); }
.appbar .doc { display: flex; align-items: center; gap: var(--space-2); font: var(--weight-medium) var(--fs-13) var(--font-sans); color: var(--fg-secondary); }
.appbar .doc .sep { color: var(--fg-muted); }
.appbar .tools { margin: 0 auto; display: flex; align-items: center; gap: var(--space-1); }
.appbar .right { display: flex; align-items: center; gap: var(--space-3); }
.vsep { width: 1px; height: 24px; background: var(--divider); }

/* ---- Panels ---- */
.panel-dock { background: var(--surface); display: flex; flex-direction: column; min-height: 0; }
.panel-dock.left { grid-area: left; border-right: var(--border-width) solid var(--border-subtle); }
.panel-dock.right { grid-area: right; border-left: var(--border-width) solid var(--border-subtle); }
.dock-head { display: flex; align-items: center; justify-content: space-between; padding: var(--space-3) var(--space-4);
             border-bottom: var(--border-width) solid var(--divider); }
.dock-head .panel__title { font: var(--weight-semibold) var(--fs-12)/1.2 var(--font-sans); letter-spacing: var(--tracking-caps); text-transform: uppercase; color: var(--fg-tertiary); }
.dock-body { padding: var(--space-3); overflow-y: auto; flex: 1; min-height: 0; }
.dock-tabs { display: flex; gap: var(--space-4); padding: 0 var(--space-4); border-bottom: var(--border-width) solid var(--divider); }

/* layer rows */
.layer { display: flex; align-items: center; gap: var(--space-2); height: var(--row-h); padding: 0 var(--space-2); border-radius: var(--radius-2); cursor: pointer; color: var(--fg-secondary); }
.layer:hover { background: var(--surface-hover); }
.layer.is-selected { background: var(--selection-faint); color: var(--selection); }
.layer .li { width: var(--icon-sm); height: var(--icon-sm); flex: none; }
.layer .nm { font: var(--weight-medium) var(--fs-13) var(--font-sans); flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.layer .vis { opacity: 0; }
.layer:hover .vis { opacity: 1; }

/* ---- Canvas ---- */
.canvas-wrap { grid-area: canvas; position: relative; overflow: hidden; background: var(--canvas); }
.canvas-grid { position: absolute; inset: 0;
  background-image: linear-gradient(var(--canvas-grid) 1px, transparent 1px), linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
  background-size: 24px 24px; }
.canvas-grid.strong { background-image: linear-gradient(var(--canvas-grid-strong) 1px, transparent 1px), linear-gradient(90deg, var(--canvas-grid-strong) 1px, transparent 1px); background-size: 120px 120px; }
.stage { position: absolute; inset: 0; display: grid; place-items: center; }
.artboard { position: relative; width: 720px; height: 460px; background: var(--surface-2);
  box-shadow: var(--shadow-3); border-radius: var(--radius-1); transition: transform var(--dur-base) var(--ease-out); }
[data-theme="dark"] .artboard { background: #12161F; box-shadow: 0 0 0 1px var(--canvas-edge), var(--shadow-3); }
.artboard-label { position: absolute; top: -22px; left: 0; font: var(--weight-medium) var(--fs-12) var(--font-sans); color: var(--fg-muted); }

.shape { position: absolute; cursor: pointer; }
.shape .sel { position: absolute; inset: -1px; border: var(--border-width-2) solid var(--selection); border-radius: inherit; opacity: 0; pointer-events: none; }
.shape.is-selected .sel { opacity: 1; }
.handle { position: absolute; width: 9px; height: 9px; background: var(--handle-fill); border: var(--border-width-2) solid var(--handle-stroke); border-radius: 2px; opacity: 0; pointer-events: none; transform: translate(-50%, -50%); }
.shape.is-selected .handle { opacity: 1; }
.handle.tl { top: -1px; left: -1px; } .handle.tr { top: -1px; left: 100%; }
.handle.bl { top: 100%; left: -1px; } .handle.br { top: 100%; left: 100%; }
.handle.tc { top: -1px; left: 50%; } .handle.bc { top: 100%; left: 50%; }
.handle.lc { top: 50%; left: -1px; } .handle.rc { top: 50%; left: 100%; }
.dim-tag { position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%); opacity: 0; pointer-events: none; white-space: nowrap; }
.shape.is-selected .dim-tag { opacity: 1; }

/* floating canvas controls */
.canvas-float { position: absolute; bottom: var(--space-4); left: 50%; transform: translateX(-50%); }
.zoom-pill { display: flex; align-items: center; gap: var(--space-1); padding: var(--space-1) var(--space-2);
  background: var(--surface); border: var(--border-width) solid var(--border-subtle); border-radius: var(--radius-3); box-shadow: var(--shadow-2); }
.zoom-val { min-width: 48px; text-align: center; font: var(--weight-medium) var(--fs-13) var(--font-mono); color: var(--fg-secondary); }

.empty-hint { position: absolute; top: var(--space-4); left: 50%; transform: translateX(-50%);
  font: var(--weight-medium) var(--fs-12) var(--font-sans); color: var(--fg-muted); background: var(--surface); padding: var(--space-2) var(--space-3); border-radius: var(--radius-2); border: var(--border-width) solid var(--border-subtle); }

/* responsive: collapse left panel on iPad portrait */
@media (max-width: 1112px) {
  .app { grid-template-columns: 0 1fr var(--panel-w-wide); }
  .panel-dock.left { position: absolute; left: 0; top: var(--toolbar-h); bottom: 0; width: var(--panel-w-min); z-index: var(--z-overlay); box-shadow: var(--shadow-3); transform: translateX(-100%); transition: transform var(--dur-base) var(--ease-out); }
  .panel-dock.left.is-open { transform: none; }
  .appbar .tools { margin-left: var(--space-2); }
}
@media (max-width: 834px) {
  .app { grid-template-columns: 0 1fr 0; }
  .panel-dock.right { position: absolute; right: 0; top: var(--toolbar-h); bottom: 0; width: var(--panel-w-wide); z-index: var(--z-overlay); box-shadow: var(--shadow-3); transform: translateX(100%); transition: transform var(--dur-base) var(--ease-out); }
  .panel-dock.right.is-open { transform: none; }
  .appbar .doc { display: none; }
}
.mobile-only { display: none; }
@media (max-width: 1112px) { .mobile-only { display: inline-flex; } }
/* The right inspector only collapses off-screen at ≤834px, so its toggle
   appears only there (the left Layers toggle appears at ≤1112px above). */
.mobile-right-only { display: none; }
@media (max-width: 834px) { .mobile-right-only { display: inline-flex; } }

canvas { display:block; width:100%; height:100%; touch-action:none; }