/* Dan’s sp.html tile chrome — click, no labels. Prefix .skt so the paper landing stays paper. */
.skt-host{
  --skt-line:#333;
  background:#000;color:#eee;
  min-height:min(78vh,720px);
  border-radius:16px;
  overflow:hidden;
  display:flex;flex-direction:column;align-items:center;
  padding:10px 12px 16px;
  box-sizing:border-box;
  user-select:none;-webkit-tap-highlight-color:transparent;
  position:relative;
}
.skt-page,.skt-page body{margin:0;height:100%;background:#000}
.skt-page .skt-host{min-height:100dvh;height:100%;border-radius:0;padding:max(8px,env(safe-area-inset-top)) 12px max(12px,env(safe-area-inset-bottom))}

.skt-trail{
  display:flex;flex-direction:column;align-items:center;gap:14px;
  flex:0 0 auto;width:100%;padding:8px 48px 10px;
}
.skt-crumb{
  appearance:none;border:3px solid var(--accent,#333);background:#111;
  padding:0;margin:0;width:128px;height:128px;border-radius:10%;
  overflow:hidden;cursor:pointer;flex:0 0 auto;box-sizing:border-box;position:relative;
  transition:box-shadow .2s;
}
.skt-crumb.is-sz0{width:min(56vw,34vh,220px);height:min(56vw,34vh,220px);border-width:6px}
.skt-crumb.is-sz1{width:112px;height:112px;border-width:4px}
.skt-crumb.is-sz2{width:64px;height:64px;border-width:3px}
.skt-crumb img,.skt-crumb .skt-ini{
  display:flex;width:100%;height:100%;align-items:center;justify-content:center;
  object-fit:contain;pointer-events:none;
}
.skt-crumb.is-teacher img,.skt-crumb.is-teacher .skt-ini{object-fit:cover}

.skt-stage{position:relative;flex:1 1 auto;min-height:0;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center}
.skt-grid{
  flex:0 1 auto;min-height:0;width:100%;max-width:720px;overflow:auto;
  display:flex;flex-wrap:wrap;place-content:center;gap:16px 18px;padding:4px 2px 8px;
  box-sizing:border-box;
}
.skt-tile{
  appearance:none;border:0;background:transparent;padding:0;margin:0;cursor:pointer;
  display:flex;flex-direction:column;align-items:center;width:min(28vw,132px);flex:0 0 auto;color:#eee;
  animation:skt-in .45s cubic-bezier(.2,1.15,.32,1) both;
  animation-delay:calc(var(--i, 0) * 55ms);
}
.skt-frame{
  width:100%;aspect-ratio:1;border-radius:10%;overflow:hidden;background:#111;
  border:6px solid var(--accent,#333);box-sizing:border-box;display:grid;place-items:center;padding:8px;
  transition:transform .2s ease,box-shadow .2s ease;
}
.skt-tile.is-teacher .skt-frame,.skt-tile.is-school .skt-frame{padding:0}
.skt-tile img{display:block;width:100%;height:100%;object-fit:contain;pointer-events:none}
.skt-tile.is-teacher img,.skt-tile.is-school img{object-fit:cover}
.skt-ini{
  font:700 clamp(22px,6vw,36px)/1 system-ui,sans-serif;color:#eee;letter-spacing:.04em;
  width:100%;height:100%;display:flex;align-items:center;justify-content:center;
}
.skt-tile:active{transform:scale(.94)}
.skt-cap{
  margin-top:8px;max-width:100%;text-align:center;
  font:600 12px/1.25 system-ui,sans-serif;color:#ccc;
  overflow:hidden;text-overflow:ellipsis;display:-webkit-box;
  -webkit-line-clamp:2;-webkit-box-orient:vertical;
}

.skt-results{display:flex;flex-direction:column;align-items:center;gap:12px;width:100%;flex:1 1 auto;min-height:0}
.skt-blox{
  width:min(78vw,280px);height:min(78vw,280px);margin:0 auto;
  display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);
  gap:3px;padding:6px;box-sizing:border-box;border-radius:10px;border:2px solid #444;background:#000;
}
.skt-blox .cell{border-radius:3px;background:#141414;min-width:0;min-height:0;position:relative}
.skt-blox .cell .sq{
  position:absolute;inset:0;border-radius:2px;
  animation:skt-fill .32s ease both;
  animation-delay:calc(var(--i, 0) * 14ms);
}
.skt-blox.is-in .cell{
  appearance:none;border:0;padding:0;margin:0;cursor:pointer;color:inherit;display:block;width:100%;height:100%;
}
.skt-blox.is-in .cell.is-mine{outline:3px solid #fff;outline-offset:-2px;z-index:1}
.skt-blox.is-in:not(.is-done) .cell:hover{filter:brightness(1.12)}
.skt-blox.is-in .cell:focus-visible{outline:2px solid #eee;outline-offset:-1px}

.skt-lessons{
  flex:0 0 auto;width:min(92vw,360px);margin:0 auto;display:flex;flex-direction:column;gap:6px;
  padding:2px 0 8px;max-height:min(38vh,260px);overflow:auto;
}
.skt-lesson{
  display:grid;grid-template-columns:5.5em 1fr auto;align-items:center;gap:8px;
  padding:10px 12px;border-radius:8px;border:2px solid #444;background:#0d1117;
  color:#eee;text-decoration:none;font:14px/1.25 system-ui,sans-serif;
  animation:skt-in .3s ease both;
  animation-delay:calc(.15s + var(--i, 0) * 40ms);
}
.skt-lesson:hover,.skt-lesson:focus-visible{border-color:#888;outline:none}
.skt-lesson-when{color:#9ab;font-variant-numeric:tabular-nums;white-space:nowrap}
.skt-lesson-what{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.skt-lesson-go{color:#8c8;font-size:12px;font-weight:700;letter-spacing:.02em}
.skt-lessons-more{
  margin-top:4px;text-align:center;color:#9ab;font:13px/1.3 system-ui,sans-serif;text-decoration:none;
}
.skt-lessons-more:hover{color:#eee}
.skt-lessons-empty{margin:0;color:#888;font:13px/1.35 system-ui,sans-serif;text-align:center}

.skt-help{
  appearance:none;position:absolute;z-index:10;
  top:max(8px,env(safe-area-inset-top));right:8px;
  width:44px;height:44px;padding:0;margin:0;
  border-radius:50%;border:2px solid #666;background:#111;color:#eee;
  font:700 22px/1 Georgia,serif;cursor:pointer;
}
.skt-help[aria-expanded="true"]{border-color:#eee}
.skt-hint{
  position:absolute;z-index:9;left:12px;right:12px;bottom:max(12px,env(safe-area-inset-bottom));
  max-width:36em;margin:0 auto;padding:14px 16px;border-radius:12px;
  background:#161616;color:#eee;border:1px solid #444;
  font:15px/1.4 system-ui,sans-serif;
}

@media (hover:hover){
  .skt-tile:hover .skt-frame{
    transform:scale(1.06);
    box-shadow:0 0 0 1px var(--accent),0 0 22px color-mix(in srgb,var(--accent) 60%,transparent);
  }
  .skt-crumb:hover{box-shadow:0 0 22px color-mix(in srgb,var(--accent) 55%,transparent)}
}
.skt-tile:focus-visible .skt-frame,.skt-crumb:focus-visible{
  outline:2px solid #eee;outline-offset:3px;
}

@keyframes skt-in{
  from{opacity:0;transform:translateY(12px) scale(.9)}
  to{opacity:1;transform:none}
}
@keyframes skt-fill{
  from{opacity:0;transform:scale(.35)}
  to{opacity:1;transform:none}
}

@media (prefers-reduced-motion:reduce){
  .skt-tile,.skt-lesson,.skt-blox .cell .sq{animation:none!important}
  .skt-tile .skt-frame{transition:none}
}