.app-shell {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: 72px minmax(420px, 1fr) 300px;
  grid-template-rows: auto minmax(0, 1fr);
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  gap: 10px;
  padding: 10px;
}

.app-shell[data-mode="edit"] {
  grid-template-columns: 248px minmax(420px, 1fr) 300px;
}

.app-shell[data-mode="batch"] {
  grid-template-columns: minmax(420px, 1fr) 300px;
}

.app-shell[data-mode="batch"] .workspace {
  grid-column: 1;
}

.app-shell[data-mode="batch"] .sidebar {
  grid-column: 2;
}

.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
  padding: 8px 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--glass-bg);
  box-shadow: var(--shadow), var(--inner-glow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  isolation: isolate;
}

.toolbar {
  grid-column: 1;
  grid-row: 2;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
  overflow: visible;
  padding: 12px 10px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--glass-bg);
  box-shadow: var(--shadow), var(--inner-glow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}

.toolbar-tools {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 0 0 auto;
  overflow: visible;
}

.app-shell[data-mode="edit"] .toolbar {
  overflow: auto;
}

.app-shell[data-mode="edit"] .toolbar-tools {
  flex-direction: row;
  flex-wrap: wrap;
}

.toolbar-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 0 0 auto;
  margin-top: auto;
  padding-top: 6px;
}

.workspace {
  grid-column: 2;
  grid-row: 2;
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background:
    radial-gradient(circle at 25% 20%, color-mix(in srgb, var(--accent-mid) 16%, transparent), transparent 28%),
    var(--glass-bg);
  box-shadow: var(--shadow), var(--inner-glow);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}

.canvas-stage,
#mainCanvas {
  width: 100%;
  height: 100%;
}

#mainCanvas {
  display: block;
  touch-action: none;
}

.sidebar {
  grid-column: 3;
  grid-row: 2;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.sidebar-tiles,
.sidebar-edit,
.sidebar-batch {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  gap: 10px;
}

.sidebar-edit .sidebar-panel,
.sidebar-batch .sidebar-panel {
  flex: 1 1 auto;
}

.sidebar-tabs {
  flex: 0 0 auto;
}

.sidebar-panel-stack {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: 0 10px 28px var(--glass-shadow);
}