.petra-demo, .petra-architecture { grid-column: 1 / -1; min-width: 0; }
.petra-demo .architecture, .petra-architecture { margin-top: 0; }
.petra-content { padding-top: 18px; }
.petra-preview { max-width: 960px; margin: 12px auto 0; }
.petra-play[open] + .petra-preview { display: none; }
#petra-preview-title { font-size: 13px; color: var(--muted); margin-bottom: 9px; text-align: center; }
.petra-steps { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 7px; list-style: none; padding: 0; margin: 0 0 12px; counter-reset: step; }
.petra-steps li { counter-increment: step; }
.petra-steps button { display: flex; align-items: center; gap: 9px; width: 100%; min-height: 44px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; font: inherit; font-size: 13px; background: transparent; text-align: left; }
.petra-steps button::before { content: counter(step); color: var(--purple); font-size: 11px; }
.petra-steps button[aria-current="step"] { border-color: var(--purple); background: var(--surface-soft); }
.petra-steps li[data-complete] button { border-bottom-color: var(--purple); }
.petra-controls { display: flex; gap: 12px 20px; align-items: center; margin-bottom: 14px; }
.petra-playback { display: flex; align-items: center; gap: 7px; flex-shrink: 0; }
.petra-button { min-height: 44px; padding: 8px 14px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface); font: inherit; font-size: 13px; }
.petra-button:hover:not(:disabled) { border-color: var(--purple); }
#petra-motion { min-width: 72px; border-color: var(--purple); }
.petra-status { font-size: 14px; color: var(--body); margin: 0; }
.petra-graph-frame { position: relative; aspect-ratio: 1116 / 502; max-width: 1118px; margin-inline: auto; overflow: hidden; border: 1px solid var(--line); border-radius: 6px; background-color: var(--surface); background-image: radial-gradient(var(--graph-dot) .7px, transparent .7px); background-size: 19px 19px; }
.petra-graph { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.petra-preview .petra-graph-frame { aspect-ratio: 1116 / 330; }
.petra-source { margin: 10px 0 0; font-size: 12px; color: var(--muted); }
.petra-source a { color: var(--purple); text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 640px) {
  .petra-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 5px; }
  .petra-steps button { font-size: 12px; gap: 6px; padding-inline: 8px; }
  .petra-controls { flex-wrap: wrap; gap: 10px; }
  .petra-status { width: 100%; min-height: 3.2em; font-size: 13px; }
}