.studio-quickstart {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  list-style: none;
  margin: 0 0 32px;
  padding: 0 0 24px;
  border-bottom: 1px solid var(--rule);
}
.studio-quickstart li { min-width: 0; }
.studio-quickstart button { justify-content: flex-start; font-weight: 600; }
.studio-quickstart button span[aria-hidden] { font-variant-numeric: tabular-nums; }
.studio-quickstart p { margin: 8px 0 0; color: var(--muted); font-size: 14px; max-width: 32ch; }
.workspace { align-items: start; }
.editor .section { margin-top: 24px; padding-top: 20px; }
.basic-properties { display: grid; grid-template-columns: 64px 1fr; gap: 24px; align-items: center; }
.basic-properties input[type=color], #background { height: 44px; width: 64px; padding: 3px; border: 1px solid var(--rule); border-radius: 8px; background: none; cursor: pointer; }
.basic-properties output { float: right; color: var(--muted); font-weight: 400; }
.layers { display: grid; gap: 8px; margin: 12px 0; }
.layers button { justify-content: space-between; text-align: left; overflow: hidden; width: 100%; }
.layers button span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.layers small { font-size: 12px; flex-shrink: 0; }
#stacking-hint { margin-top: 12px; }
.scene-options { border-top: 1px solid var(--rule); margin-top: 24px; padding-top: 20px; }
.scene-options summary, .advanced-motion summary { cursor: pointer; font-weight: 600; min-height: 44px; }
.scene-options[open] summary { margin-bottom: 16px; }
.stage { position: sticky; top: 20px; }
.stage-bar { background: var(--panel); }
#viewport { height: 420px; overflow: auto; overscroll-behavior: contain; scrollbar-color: var(--muted) var(--panel); scrollbar-width: thin; scroll-behavior: auto; }
#track { height: 1600px; }
#scene { height: 420px; position: sticky; top: 0; overflow: hidden; perspective: 800px; isolation: isolate; }
.layer { position: absolute; left: 50%; top: 50%; display: flex; align-items: center; justify-content: center; will-change: transform, opacity; text-align: center; line-height: 1.05; font-weight: 600; letter-spacing: -.04em; overflow-wrap: anywhere; pointer-events: none; }
.layer img { width: 100%; height: 100%; object-fit: cover; border-radius: 12px; }
.layer.ring { border-style: solid; border-radius: 28%; box-shadow: 8px 16px 24px #20282612; }
.layer.circle { border-radius: 50%; }
.layer.square { border-radius: 16px; }
.transport { padding: 20px 24px 12px; background: var(--paper); border-top: 1px solid var(--rule); }
.transport input { margin-bottom: 12px; }
.transport .hint { margin: 12px 0 0; }
.transport .status { margin: 6px 0 0; min-height: 22px; }
.advanced-motion summary { font-size: 22px; }
.advanced-motion summary span { color: var(--muted); font-size: 14px; font-weight: 400; margin-left: 16px; }
.advanced-motion[open] summary { margin-bottom: 12px; }
.timing { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.timing output { font-variant-numeric: tabular-nums; }
.keyframes { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.frame-fields { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.frame-fields label { font-size: 13px; }
.frame-fields input { padding: 8px !important; }
.export-help { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.export-help p { max-width: 64ch; }
.export-help .actions { margin-bottom: 16px; }
@media (max-width: 1000px) {
  .frame-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .studio-quickstart { gap: 16px; }
  .studio-quickstart button { font-size: 14px; padding-inline: 12px; }
}
@media (max-width: 650px) {
  .studio-quickstart { gap: 8px; margin-bottom: 24px; padding-bottom: 24px; }
  .studio-quickstart button { min-height: 70px; width: 100%; align-items: flex-start; justify-content: center; text-align: left; padding: 12px 8px; line-height: 1.35; }
  .studio-quickstart p { display: none; }
  .stage { position: static; grid-row: 1; }
  .editor { grid-row: 2; }
  .keyframes, .export-help { grid-template-columns: 1fr; }
  .export-help { gap: 16px; }
  .timing { gap: 20px; }
  .advanced-motion summary span { display: block; margin: 8px 0 0; }
  #viewport, #scene { height: 320px; }
  .transport { padding: 16px; }
  .transport button { font-size: 14px; padding-inline: 12px; }
  .layers { grid-template-columns: 1fr 1fr; }
  .layers button { font-size: 13px; gap: 4px; }
  .layers small { display: none; }
}