/* ================================================================
   layout.css — App shell: topbar + 3-column workspace.
   ================================================================ */

.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: 56px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ===================== TOPBAR ===================== */
.topbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--s-4);
  padding: 0 var(--s-5);
  background: var(--panel-glass);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border-bottom: 1px solid var(--stroke);
  z-index: var(--z-topbar);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-weight: 700;
  font-size: var(--fz-lg);
  letter-spacing: -.01em;
}

.brand-sub {
  color: var(--muted);
  font-weight: 500;
  margin-left: 2px;
}

.logo-icon {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, rgba(78,161,255,.18), rgba(255,138,42,.14));
  border: 1px solid var(--stroke);
  transition: transform var(--transition);
}

.logo-icon:hover { transform: rotate(-4deg) scale(1.06); }

.top-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.zoom-bar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--stroke);
  border-radius: var(--r-pill);
}

.zoom-bar .sep {
  width: 1px;
  height: 18px;
  background: var(--stroke);
  margin: 0 var(--s-2);
}

.zoom-val {
  min-width: 46px;
  padding: 0 var(--s-2);
  text-align: center;
  font-size: var(--fz-xs);
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  justify-content: flex-end;
}

/* ===================== WORKSPACE ===================== */
.workspace {
  display: grid;
  grid-template-columns: 288px 1fr 320px;
  min-height: 0;
  overflow: hidden;
}

.panel {
  background: var(--panel-glass-2);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.panel.left  { border-right: 1px solid var(--stroke); }
.panel.right { border-left:  1px solid var(--stroke); }

.panel-header {
  padding: var(--s-4) var(--s-5);
  border-bottom: 1px solid var(--stroke-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-label {
  font-size: var(--fz-xs);
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted-2);
}

/* ===================== STAGE ===================== */
.stage {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  position: relative;
  background:
    radial-gradient(600px 400px at 50% 0%, rgba(78,161,255,.05), transparent 70%);
}

.stage-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-5);
  border-bottom: 1px solid var(--stroke-soft);
  background: rgba(7, 11, 22, .35);
}

.stage-info {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.stage-hint {
  font-size: var(--fz-xs);
  color: var(--muted-2);
  font-weight: 500;
}

.canvas-wrap {
  flex: 1;
  overflow: auto;
  min-height: 0;
  padding: var(--s-8) var(--s-6);
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

@media (max-width: 1200px) {
  .workspace { grid-template-columns: 240px 1fr 290px; }
}
@media (max-width: 980px) {
  .workspace { grid-template-columns: 220px 1fr 260px; }
  .stage-hint { display: none; }
}