.app-shell {
  width: 100vw;
  height: 100dvh;
  min-height: 620px;
}

.welcome-screen {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) minmax(360px, 1.2fr);
  grid-template-rows: 1fr auto;
  gap: clamp(1.5rem, 4vw, 4rem);
  width: 100%;
  height: 100%;
  padding: clamp(1.25rem, 4vw, 4.5rem);
  align-items: center;
}

.welcome-brand {
  display: grid;
  place-items: center;
  align-self: stretch;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    linear-gradient(90deg, rgba(31, 122, 114, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(31, 122, 114, 0.06) 1px, transparent 1px),
    var(--surface);
  background-size: 36px 36px;
  box-shadow: var(--shadow);
}

.brand-mark {
  width: min(34vw, 280px);
  height: min(34vw, 280px);
  color: var(--teal);
  fill: rgba(31, 122, 114, 0.16);
  stroke: currentColor;
  stroke-width: 2.4;
}

.welcome-copy {
  display: grid;
  gap: 1rem;
  max-width: 680px;
}

.welcome-copy p:last-child {
  max-width: 45rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.45;
}

.welcome-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 260px));
  gap: 1rem;
  margin-top: 2.25rem;
}

.welcome-specs {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
}

.editor-shell {
  display: grid;
  grid-template-rows: var(--topbar) minmax(0, 1fr) var(--context) var(--bottom);
  width: 100%;
  height: 100%;
  background: var(--bg);
}

.topbar {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.94);
}

.project-strip {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.85rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: max-content;
}

.workspace {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr) var(--side);
  min-height: 0;
}

.tool-rail {
  display: grid;
  align-content: start;
  gap: 0.2rem;
  padding: 0.5rem 0.55rem;
  border-right: 1px solid var(--line);
  background: var(--surface);
  overflow-y: auto;
  overflow-x: hidden;
}

.canvas-stage {
  position: relative;
  display: grid;
  grid-template-rows: 40px minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
  padding: 0.75rem;
  background: #ecefeb;
}

.canvas-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-width: 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.canvas-viewport {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background:
    linear-gradient(90deg, rgba(31, 41, 38, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(31, 41, 38, 0.045) 1px, transparent 1px),
    #f3f5f2;
  background-size: 28px 28px;
}

#vectorCanvas {
  display: block;
  width: min(100%, 96vh * 1.6);
  height: auto;
  max-height: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-sm);
  background: var(--surface-strong);
  box-shadow: 0 8px 28px rgba(31, 41, 38, 0.12);
  touch-action: none;
}

.side-panel {
  min-width: 0;
  border-left: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
}

.panel-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
  padding: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.side-panel-view {
  height: calc(100% - 62px);
  padding: 0.9rem;
  overflow-y: auto;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.context-panel {
  display: block;
  min-height: 0;
  overflow: hidden;
  border-top: 1px solid var(--line);
  background: var(--surface-strong);
}

.context-group {
  display: none;
  height: 100%;
  min-height: 0;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 0.85rem 1rem;
}

.context-group.is-active {
  display: grid;
}

.context-group > header {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.bottom-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
  padding: 0.65rem 1rem max(0.65rem, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: var(--surface);
}