.activity-heading { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: var(--space-4); }
.activity-heading > div:first-child { display: grid; gap: var(--space-2); }
.activity-heading h1, .activity-heading p { margin: 0; }
.activity-kind, .activity-kind > div { display: flex; align-items: center; gap: var(--space-2); }
.activity-kind { flex-shrink: 0; }
.activity-kind > div { gap: var(--space-1); padding: var(--space-1); background: var(--muted); border-radius: var(--radius-md); }
.activity-kind [aria-pressed="true"] { background: var(--primary); color: var(--primary-foreground); }
.activity-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; padding: 0; margin: 0; border-bottom: 1px solid var(--border); }
.activity-flow li { min-width: 0; }
.activity-flow button { display: flex; justify-content: center; gap: var(--space-2); width: 100%; height: 100%; align-items: center; padding: var(--space-3) var(--space-1); border: 0; border-bottom: 2px solid transparent; background: transparent; color: var(--foreground); font: inherit; font-size: var(--fs-sm); cursor: pointer; }
.activity-flow button:hover:not(:disabled) { background: var(--muted); }
.activity-flow button[aria-current="step"] { border-bottom-color: var(--primary); font-weight: 600; }
.activity-flow button:disabled { cursor: default; color: var(--muted-foreground); }
.activity-step-number { display: grid; place-items: center; flex-shrink: 0; width: var(--space-6); height: var(--space-6); background: var(--muted); border-radius: var(--radius-full); font-size: var(--fs-xs); font-variant-numeric: tabular-nums; }
.activity-flow button[aria-current="step"] .activity-step-number { background: var(--primary); color: var(--primary-foreground); }
.activity-workspace { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: var(--space-8); }
.activity-detail { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-3); min-width: 0; grid-column: 2; grid-row: 1; }
.activity-detail h2, .activity-detail p { margin: 0; }
.activity-detail ol { padding-left: var(--space-5); margin: var(--space-2) 0; font-size: var(--fs-sm); }
.activity-detail li + li { margin-top: var(--space-3); }
.activity-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.activity-navigation { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); width: 100%; margin-top: var(--space-3); }
.activity-visual { min-width: 0; grid-column: 1; grid-row: 1; }
.activity-scene { margin: 0; background: var(--muted); border-radius: var(--radius-md); padding: var(--space-6) var(--space-3); }
.activity-scene svg { display: block; width: 100%; height: auto; }
.activity-scene figcaption { text-align: center; color: var(--foreground); }
.activity-scene-road { fill: none; stroke: var(--border); stroke-width: 15; }
.activity-scene-ground { fill: var(--background); stroke: var(--border); stroke-width: 1; }
.activity-scene-boundary { fill: none; stroke: var(--primary); stroke-width: 2; stroke-dasharray: 6 4; }
.activity-building-front { fill: var(--primary); }
.activity-building-side { fill: color-mix(in srgb, var(--primary) 75%, var(--foreground)); }
.activity-building-roof { fill: color-mix(in srgb, var(--primary) 65%, var(--background)); }
.activity-building-window { fill: var(--background); }
.activity-building-door { fill: var(--foreground); }
.activity-scene-record rect { fill: var(--background); stroke: var(--primary); }
.activity-scene-record text { fill: var(--foreground); font: 13px var(--font-sans-locale); }
.activity-scene-record path { fill: none; stroke: var(--primary); stroke-width: 2; }
.activity-scene-pin path { fill: var(--primary); }
.activity-scene-pin circle { fill: var(--primary-foreground); }
.activity-scene[data-stage="0"] .activity-scene-building, .activity-scene[data-stage="0"] .activity-scene-record, .activity-scene[data-stage="1"] .activity-scene-record, .activity-scene[data-approved="false"] .activity-scene-pin { display: none; }
.activity-outcomes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-block: 1px solid var(--border); padding-block: var(--space-5); }
.activity-outcome { display: flex; flex-direction: column; gap: var(--space-2); min-width: 0; padding-inline: var(--space-5); }
.activity-outcome:first-child { padding-left: 0; }
.activity-outcome + .activity-outcome { border-left: 1px solid var(--border); }
.activity-outcome h3, .activity-outcome p { margin: 0; }
.activity-outcome p { word-break: keep-all; overflow-wrap: anywhere; }
.activity-metric { font-size: var(--fs-h1); line-height: var(--lh-h1); font-variant-numeric: tabular-nums; color: var(--muted-foreground); }
.activity-outcome[data-active="true"] .activity-metric { color: var(--foreground); }
.activity-example-note { margin-top: calc(-1 * var(--space-3)); }
.activity-announcement { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.activity-reference { border-top: 1px solid var(--border); padding-top: var(--space-4); }
.activity-reference summary { cursor: pointer; font-size: var(--fs-sm); }
.activity-reference > div { display: grid; gap: var(--space-3); margin-top: var(--space-4); }
.activity-reference-links { display: flex; flex-wrap: wrap; gap: var(--space-4); font-size: var(--fs-sm); }
.activity-no-script { display: grid; gap: var(--space-6); }
.activity-no-script ol { margin-block: var(--space-3); padding-left: var(--space-5); }
.activity-page [hidden] { display: none !important; }
@media (max-width: 767px) {
  .activity-flow button { flex-direction: column; gap: var(--space-1); }
  .activity-workspace { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
  .activity-visual, .activity-detail { grid-column: 1; grid-row: auto; }
  .activity-visual { order: -1; }
  .activity-scene { padding: var(--space-3); }
  .activity-heading h1 { font-size: var(--fs-h1); }
  .activity-scene svg { max-height: 160px; }
  .activity-outcomes { padding-block: var(--space-4); }
  .activity-outcome { padding-inline: var(--space-2); }
  .activity-outcome h3 { font-size: var(--fs-xs); }
}