/* Classroom › Race (js/race.js). Our own tracks drawn with CSS gradients (no pictures), our own vehicles (assets/race/).
   The track is its own scene, so it looks the same in the light and the dark theme; names sit on dark pills. */
.race{--lanes:10;--car:120px;--font:18px;--travel:400px;--foot:64px;position:relative;height:clamp(380px,calc(100vh - 110px),1400px);border-radius:22px;overflow:hidden;margin:0 0 12px;
  isolation:isolate;box-shadow:0 10px 30px rgba(0,0,0,.18);user-select:none;-webkit-user-select:none;touch-action:manipulation}
.race-ground,.race-wx,.race-lanes{position:absolute;inset:0}
.race-wx{width:100%;height:100%;pointer-events:none;z-index:1}
.race-lanes{display:grid;grid-template-columns:repeat(var(--lanes),minmax(0,1fr));z-index:2;padding:0 6px}
.rl{position:relative;min-width:0}
.rl+.rl::before{content:"";position:absolute;left:0;top:44px;bottom:0;width:4px;margin-left:-2px;background:var(--divider);background-size:4px 44px;opacity:.85}

/* ---- tracks ---- */
.race.th-city{--divider:repeating-linear-gradient(to bottom,rgba(255,255,255,.75) 0 22px,transparent 22px 44px)}
.th-city .race-ground{background:
  linear-gradient(90deg,#6b7280 0 14px,#9ca3af 14px 18px,transparent 18px calc(100% - 18px),#9ca3af calc(100% - 18px) calc(100% - 14px),#6b7280 calc(100% - 14px)),
  radial-gradient(circle at 20% 30%,rgba(255,255,255,.04) 0 2px,transparent 3px) 0 0/38px 38px,
  linear-gradient(180deg,#3d434c,#2f343b)}
.race.th-circuit{--divider:linear-gradient(rgba(255,255,255,.55),rgba(255,255,255,.55))}
.th-circuit .race-ground{background:
  repeating-linear-gradient(180deg,#e11d48 0 26px,#fff 26px 52px) left/12px 100% no-repeat,
  repeating-linear-gradient(180deg,#e11d48 0 26px,#fff 26px 52px) right/12px 100% no-repeat,
  linear-gradient(180deg,#2a2d33,#1d2025)}
.race.th-space{--divider:linear-gradient(rgba(147,197,253,.0),rgba(147,197,253,.55),rgba(147,197,253,.0))}
.th-space .race-ground{background:
  radial-gradient(circle at 12% 22%,#fff 0 1px,transparent 2px),radial-gradient(circle at 68% 12%,#fff 0 1.2px,transparent 2px),
  radial-gradient(circle at 40% 68%,#cbd5ff 0 1px,transparent 2px),radial-gradient(circle at 86% 58%,#fff 0 1px,transparent 2px),
  radial-gradient(circle at 25% 88%,#fde68a 0 1px,transparent 2px),
  radial-gradient(ellipse at 80% 100%,rgba(139,92,246,.45),transparent 55%),radial-gradient(ellipse at 10% 0%,rgba(14,165,233,.35),transparent 50%),
  linear-gradient(180deg,#0b1030,#140b2e 60%,#0a0f22);background-size:140px 140px,190px 190px,170px 170px,230px 230px,210px 210px,100% 100%,100% 100%,100% 100%}
.race.th-sea{--divider:repeating-linear-gradient(to bottom,#fbbf24 0 10px,transparent 10px 18px,#f97316 18px 28px,transparent 28px 36px)}
.th-sea .race-ground{background:
  repeating-radial-gradient(ellipse at 50% 120%,rgba(255,255,255,.13) 0 2px,transparent 3px 26px) 0 0/90px 60px,
  linear-gradient(180deg,#0e7490,#0369a1 55%,#075985)}

/* finish: a gold checkered banner at the top ("FINISH = 10 ⭐ — WIN A 🏆 TROPHY!"); start line near the bottom */
.race-finish{position:absolute;left:0;right:0;top:0;height:clamp(48px,calc(var(--font) * 2.4),72px);z-index:3;display:flex;align-items:center;justify-content:center;gap:10px;
  background:repeating-conic-gradient(#1b1405 0 25%,#f6c445 0 50%) 0 0/22px 22px;box-shadow:0 4px 0 rgba(0,0,0,.28),inset 0 -3px 0 rgba(0,0,0,.25)}
.race-banner{font:900 clamp(16px,calc(var(--font) * 1.05),30px)/1.1 var(--f-fun);letter-spacing:.02em;color:#2b1d00;white-space:nowrap;max-width:calc(100% - 24px);overflow:hidden;text-overflow:ellipsis;
  padding:6px 18px 4px;border-radius:999px;background:linear-gradient(180deg,#fff3c4,#fcd34d 45%,#f59e0b);box-shadow:0 0 0 3px #2b1d00,0 6px 14px rgba(0,0,0,.35)}
.race-finish .pbadge{position:absolute;right:10px;top:50%;transform:translateY(-50%)}
.race.cheer .race-banner{animation:raceFinish .5s ease-in-out 4 alternate}
.race.cheer .race-finish{animation:raceFinish .5s ease-in-out 4 alternate}
@keyframes raceFinish{to{filter:brightness(1.3)}}
.race-start{position:absolute;left:0;right:0;bottom:calc(var(--foot) + 8px + var(--car) * .4);height:6px;z-index:1;background:repeating-linear-gradient(90deg,#fff 0 14px,transparent 14px 22px);opacity:.75}
/* halfway: a purple dashed Turbo Zone across every lane */
.race-turbo{position:absolute;left:0;right:0;bottom:calc(var(--foot) + 8px + var(--car) * .4 + var(--travel) * .5);height:0;border-top:4px dashed #c084fc;
  box-shadow:0 0 18px 4px rgba(168,85,247,.35);pointer-events:none}
/* the label sits on the middle of the line, above the cars (no z-index on the line, so the label can go over the lanes), on a solid pill */
.race-turbo span{position:absolute;left:50%;top:-2px;transform:translate(-50%,-50%);z-index:4;font:800 clamp(13px,calc(var(--font) * .7),20px)/1 var(--f-ui);color:#f5e8ff;
  background:#6b21a8;border:2px solid #c084fc;border-radius:999px;padding:5px 14px;white-space:nowrap;box-shadow:0 2px 8px rgba(0,0,0,.4)}

/* ---- the cars ---- */
.rcar-w{position:absolute;left:50%;bottom:calc(var(--foot) + 8px);width:var(--car);display:flex;flex-direction:column;align-items:center;
  transform:translate3d(-50%,calc(var(--p) * var(--travel) * -1),0);transition:transform .45s cubic-bezier(.16,.84,.3,1);will-change:transform;z-index:1}
.rcar-w.r-back{transition:transform .7s cubic-bezier(.45,.05,.55,.95)}
.rcar{position:relative;display:block;width:var(--car);height:var(--car);padding:0;border:0;background:none;cursor:pointer;-webkit-tap-highlight-color:transparent;margin-bottom:calc(var(--car) * -.2)}
.rcar:focus-visible{outline:3px solid #fde047;outline-offset:-10px;border-radius:24px}
.rspr{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.rcar:active .rspr{transform:scale(.96)}
.rbadge{position:absolute;width:calc(var(--car) * .3);height:calc(var(--car) * .3);transform:translate(-50%,-62%);border-radius:50%;background:#fff;
  box-shadow:0 0 0 2px #fff,0 3px 8px rgba(0,0,0,.35);overflow:hidden;display:grid;place-items:center;pointer-events:none;z-index:2}
.rbadge .av,.rbadge .av svg,.rbadge img{width:100%!important;height:100%!important;display:block;border-radius:50%}
.rbadge .av{margin:0;font-size:calc(var(--car) * .16)}
.rbadge.r-bus{width:calc(var(--car) * .17);height:calc(var(--car) * .17)}
.rmore{position:absolute;right:6%;top:4%;background:#111827;color:#fff;font-weight:800;font-size:calc(var(--font) * .8);border-radius:999px;padding:1px 8px;z-index:3}
/* the lane footer: name, points, and big − / + in the lane's colour */
.rfoot{position:absolute;left:2px;right:2px;bottom:4px;z-index:3;display:flex;flex-direction:column;align-items:center;gap:3px;padding:5px 3px 5px;border-radius:14px;
  background:rgba(10,14,22,.86);border-top:5px solid var(--lc);color:#fff;line-height:1.1}
.rname{font-size:var(--font);font-weight:800;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rpts{font-size:calc(var(--font) * 1.15);font-weight:900;color:#fde047;font-variant-numeric:tabular-nums}
.rfoot.neg .rpts{color:#fca5a5}
.rbtns{display:flex;gap:6px;justify-content:center}
.rbtns:empty{display:none}
.rf-b{min-width:44px;min-height:44px;width:min(calc(var(--lane) / 2 - 10px),72px);border:0;border-radius:12px;background:var(--lc);color:var(--lk);font:900 30px/1 var(--f-ui);
  display:grid;place-items:center;cursor:pointer;box-shadow:inset 0 -4px 0 rgba(0,0,0,.25);-webkit-tap-highlight-color:transparent;touch-action:manipulation}
.rf-b.rf-minus{background:color-mix(in srgb,var(--lc) 35%,#1f2937);color:#fff}
.rf-b:active{transform:translateY(2px);box-shadow:inset 0 -2px 0 rgba(0,0,0,.25)}
.rf-b:focus-visible{outline:3px solid #fde047;outline-offset:2px}
.race.stack .rbtns{flex-direction:column-reverse;gap:4px}
.race.stack .rf-b{width:44px}
.race.tight .rfoot{padding:4px 1px;border-radius:10px}
.rmedal{position:absolute;left:4%;top:6%;width:calc(var(--car) * .22);height:calc(var(--car) * .22);min-width:22px;min-height:22px;border-radius:50%;display:grid;place-items:center;
  font-weight:900;font-size:calc(var(--font) * .85);color:#3b2a00;box-shadow:0 2px 6px rgba(0,0,0,.35),inset 0 -3px 0 rgba(0,0,0,.18);z-index:3}
.rmedal.m1{background:radial-gradient(circle at 35% 30%,#fff7c2,#f5c518 55%,#c58f00)}
.rmedal.m2{background:radial-gradient(circle at 35% 30%,#fff,#cfd6df 55%,#8e98a5)}
.rmedal.m3{background:radial-gradient(circle at 35% 30%,#ffe0c2,#d98a4a 55%,#9a5a26);color:#2b1300}

/* exhaust puff on +1 */
.rpuff{position:absolute;left:50%;bottom:6%;width:0;height:0;pointer-events:none}
.rpuff i{position:absolute;width:calc(var(--car) * .14);height:calc(var(--car) * .14);border-radius:50%;background:rgba(226,232,240,.85);opacity:0}
.r-zoom .rpuff i{animation:racePuff .6s ease-out forwards}
.r-zoom .rpuff i:nth-child(2){animation-delay:.06s;left:-12px}
.r-zoom .rpuff i:nth-child(3){animation-delay:.12s;left:10px}
@keyframes racePuff{0%{opacity:.9;transform:translate(-50%,0) scale(.4)}100%{opacity:0;transform:translate(-50%,calc(var(--car) * .45)) scale(1.6)}}
.r-back .rspr{animation:raceRoll .7s ease-in-out}
@keyframes raceRoll{0%,100%{transform:none}25%{transform:rotate(-4deg)}60%{transform:rotate(3deg)}}
/* new vehicle: speed lines behind it and a quick stretch */
.rtrail{position:absolute;left:22%;right:22%;top:55%;height:0;pointer-events:none;opacity:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.85) 0 3px,transparent 3px 11px)}
.r-turbo .rtrail{animation:raceTrail .8s ease-out}
.r-turbo .rspr{animation:raceTurbo .55s cubic-bezier(.2,.9,.3,1.3)}
@keyframes raceTrail{0%{opacity:.95;height:calc(var(--car) * .2)}100%{opacity:0;height:calc(var(--car) * 1.2)}}
@keyframes raceTurbo{0%{transform:scale(.7,1.25);filter:brightness(1.8)}100%{transform:none;filter:none}}
/* glowing, winged, golden and Legend looks (stages 7–10) */
.r-glow .rspr,.r-wings .rspr{filter:drop-shadow(0 0 10px rgba(255,255,255,.75)) drop-shadow(0 0 22px rgba(125,211,252,.7))}
.rwings{position:absolute;left:-8%;width:116%;top:30%;height:auto;pointer-events:none;color:#fff;overflow:visible;
  fill:currentColor;stroke:rgba(15,23,42,.25);stroke-width:1.2;filter:drop-shadow(0 3px 3px rgba(0,0,0,.3));animation:raceFlap 1.6s ease-in-out infinite;transform-origin:50% 70%}
.r-wings.r-gold .rwings{color:#fde68a}
.r-wings.r-gold .rspr{filter:sepia(.35) saturate(1.5) drop-shadow(0 0 12px rgba(251,191,36,.9))}
.r-legend .rspr{filter:drop-shadow(0 0 14px rgba(253,224,71,.9)) drop-shadow(0 0 26px rgba(244,114,182,.6));animation:raceHover 1.8s ease-in-out infinite}
@keyframes raceFlap{0%,100%{transform:scaleY(1)}50%{transform:scaleY(.72)}}
@keyframes raceHover{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}

/* one bus for the class (or a bus per group) */
.race.solo .rl::before{display:none}
.rcar-w.r-bus .rcar{margin-bottom:calc(var(--car) * -.12)}

/* pit stop: points below 0, the car waits on the start line (never behind it), a little dimmed, with a 🔧 sign */
.r-pit .rspr{filter:saturate(.45) brightness(.72)}
.r-pit .rbadge{opacity:.8}
.rpit{position:absolute;right:6%;top:8%;width:calc(var(--car) * .22);height:calc(var(--car) * .22);min-width:22px;min-height:22px;border-radius:50%;
  display:grid;place-items:center;font-size:calc(var(--font) * .8);background:#fde047;box-shadow:0 2px 6px rgba(0,0,0,.35);z-index:3}
.r-pit .rpts{color:#fca5a5}

/* Settings and car colours */
.race-set-h{display:flex;align-items:center;gap:8px}
.rc-list{display:flex;flex-direction:column;gap:6px;max-height:min(62vh,640px);overflow:auto}
.rc-row{display:grid;grid-template-columns:minmax(110px,1fr) auto 56px;gap:10px;align-items:center;padding:4px 6px;border-radius:12px;background:var(--surface-2)}
.rc-who{display:flex;align-items:center;gap:8px;min-width:0}.rc-who b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rc-who .av{width:34px;height:34px;flex:none}
.rc-sw{display:flex;flex-wrap:wrap;gap:6px}
.rc-dot{width:34px;height:34px;border-radius:50%;border:3px solid var(--surface);background:var(--c);box-shadow:0 0 0 1px var(--line);padding:0}
.rc-dot.on{box-shadow:0 0 0 3px var(--ink)}
.rc-car{width:56px;height:56px}
@media (max-width:760px){.rc-row{grid-template-columns:1fr 56px}.rc-sw{grid-column:1/-1;order:3}.race{height:clamp(320px,62vh,640px)}}

@media (prefers-reduced-motion:reduce){
  .rcar-w,.rcar-w.r-back{transition:none}
  .r-zoom .rpuff i,.r-back .rspr,.r-turbo .rtrail,.r-turbo .rspr,.r-wings .rwings,.r-legend .rspr,.race.cheer .race-finish{animation:none}
}