/* Math Facts Race: a sunny race day. Sky over grass, a two-lane track, a big pad. */
:root{--brass-hi:#FFE79A;--brass:#FFD34D;--brass-lo:#E0A81E;--lacquer:#1C2554;--lacquer-hi:#26326E;--hair:rgba(255,226,140,.35);
  --ink:#FFFFFF;--ink-soft:#DCE3FF;--ink-dim:#AEB8E6;
  --navy:#1C2554;--sky:#7FD0FF;--sky-hi:#D6F2FF;--grass:#6CC24A;--grass-lo:#4A9E34;--road:#4A4F63;--road-hi:#5A6078;
  --you:#FF6B57;--rival:#6C63FF;--good:#2FB75A;--warn:#FF6F6F;
  --round:ui-rounded,"SF Pro Rounded","Arial Rounded MT Bold","Nunito",system-ui,-apple-system,"Segoe UI",sans-serif;color-scheme:light}
body{background:linear-gradient(180deg,var(--sky-hi),var(--sky) 45%,#B9E98F 45.2%,var(--grass) 60%,var(--grass-lo));color:var(--ink);font-family:var(--round)}
.screen{position:fixed;inset:0;display:flex;flex-direction:column;z-index:1}
#fx{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:30}
.card{background:linear-gradient(180deg,#2E3C82,#1F2A5E 45%)}
.card h2{font-family:var(--round);font-style:normal;color:var(--brass);font-weight:900}
.card .pill{font-family:var(--round);min-height:48px;color:#3B2A0C}
.card .pill.alt{background:rgba(255,255,255,.92);color:var(--navy);box-shadow:inset 0 0 0 2px var(--navy),0 4px 0 rgba(0,0,0,.3)}
.card p{margin:.2em 0 .5em}
.card ul{margin:.2em 0 .4em;padding-left:1.2em}
.card li{margin:.25em 0}
.card .big{font:900 1.35em/1.25 var(--round);text-align:center;margin:0 0 .3em;color:var(--brass-hi)}
.card .who{text-align:center;color:var(--ink-soft);font-weight:800;margin:0 0 .3em}
.card .starline{font-size:2.3em;line-height:1;text-align:center;margin:.1em 0 .2em;letter-spacing:.12em;color:var(--brass)}
.card .starline i{font-style:normal;color:rgba(255,255,255,.25)}
.card .row,.card .choice,.card .link{min-height:44px}
.card .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.4em;text-align:center;margin:.2em 0 .6em}
.card .grid b{display:block;font-size:1.5em;color:var(--brass-hi)}
.card .grid span{font-size:.8em;color:var(--ink-soft)}
.card .gstars{display:grid;grid-template-columns:repeat(3,1fr);gap:.2em .8em;font-size:.95em}
.card .gstars span{white-space:nowrap}
.card .gstars i{font-style:normal;color:var(--brass)}
.toggle[aria-pressed=true]{background:var(--good)}
@media (max-height:480px){.card .extra{display:none}.card .grid b{font-size:1.2em}}
@media (max-height:420px){.card{font-size:.9em}.card .big{margin:0 0 .1em}.card .starline{font-size:1.6em}}

/* home */
.home{align-items:center;justify-content:center;gap:.9em;padding:1.2em;text-align:center}
.lead{display:flex;flex-direction:column;align-items:center;gap:.3em}
.home .title{font-family:var(--round);font-weight:900;font-size:clamp(2.3em,10.5vw,4.4em);color:#fff;letter-spacing:.01em;line-height:1.02;
  text-shadow:0 3px 0 #2E3C82,0 -2px 0 #2E3C82,3px 0 0 #2E3C82,-3px 0 0 #2E3C82,0 8px 18px rgba(28,37,84,.35)}
.tagline{margin:0;color:var(--navy);font-weight:800;font-size:1.2em;text-shadow:none}
.mascot{width:150px;height:76px;animation:idle 1.2s ease-in-out infinite}
.mascot svg{width:100%;height:100%}
@keyframes idle{50%{transform:translateY(-3px)}}
.menu-col{display:flex;flex-direction:column;align-items:center;gap:.6em;width:min(25em,100%)}
.pick{display:flex;align-items:center;gap:.5em;width:100%}
.pick .lbl{color:var(--navy);font-weight:900;font-size:.9em;width:3.6em;text-align:right;flex:none}
.levels{display:flex;gap:.3em;justify-content:center;flex:1;min-width:0}
.levels .choice{flex:1;min-width:0;min-height:50px;font-weight:900;font-size:1.25em;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.05;
  background:rgba(255,255,255,.9);color:var(--navy);border:2px solid rgba(28,37,84,.25);padding:.25em .1em}
.levels .choice[aria-pressed=true]{background:linear-gradient(180deg,#FFE79A,#FFD34D);color:#3B2A0C;border-color:#E0A81E;box-shadow:0 3px 0 #C98E1D}
.levels .choice small{font-weight:800;font-size:.55em;letter-spacing:.06em;white-space:nowrap;color:#C98E1D}
.levels .choice[aria-pressed=true] small{color:#8a5a00}
.levels .choice:focus-visible{outline:3px solid var(--navy);outline-offset:2px}
.go{display:flex;gap:.6em;justify-content:center;width:100%}
.menu-col .pill{min-width:10em;min-height:56px;font-family:var(--round);color:#3B2A0C;font-size:1.3em}
.menu-col .pill.alt{background:rgba(255,255,255,.92);color:var(--navy);box-shadow:inset 0 0 0 2px var(--navy),0 4px 0 rgba(28,37,84,.35)}
.go:has(#continue:not([hidden])) .pill{min-width:0;flex:1;padding-left:.6em;padding-right:.6em}
.home .links{display:flex;gap:.1em;justify-content:center;flex-wrap:wrap}
.home .link{min-height:44px;font-size:1em;color:var(--navy);font-weight:800}
.home .link:focus-visible{outline:3px solid var(--navy)}
@media (max-height:600px){.mascot{display:none}}
@media (max-height:480px){
  .home{flex-direction:row;gap:.4em 1.4em;padding:.5em 1em}
  .home .title{font-size:2.3em}
  .lead{flex:0 1 13em;min-width:0}
  .menu-col{gap:.35em;width:auto;flex:0 1 25em;min-width:0}
  .menu-col .pill{min-width:0;width:100%;min-height:46px;padding-left:1em;padding-right:1em;font-size:1.15em}
  .levels .choice{min-height:46px;font-size:1.1em}
  .tagline{font-size:1em}
  .home .link{padding:.3em .45em;font-size:.95em}
}
@media (max-height:480px) and (max-width:760px){html:not(.hw-embed) body:has(#home:not([hidden])) #home{padding-top:.5em!important}}
@media (max-height:480px) and (max-width:620px){.home .title{font-size:1.9em}.pick .lbl{display:none}}
@media (max-width:360px){.pick .lbl{display:none}}

/* the bar */
#game{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;touch-action:manipulation}
.top{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:.6em;
  padding:max(.45em,env(safe-area-inset-top)) max(.7em,env(safe-area-inset-right)) .35em max(.7em,env(safe-area-inset-left));position:relative;z-index:5}
#menu{width:48px;height:48px;border-color:#fff;background:radial-gradient(circle at 35% 30%,#3B4CA0,var(--navy) 70%);box-shadow:0 3px 0 rgba(28,37,84,.4)}
#menu svg{stroke:#fff}
.label{justify-self:center;background:#fff;color:var(--navy);border-radius:999px;padding:.35em 1em;font-weight:900;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;box-shadow:0 3px 0 rgba(28,37,84,.2)}
.stat{display:flex;flex-direction:column;align-items:flex-end;line-height:1.1;color:var(--navy);font-weight:900;min-width:4.2em}
.stat b{font-size:1.25em;font-variant-numeric:tabular-nums}
.streak{font-size:.85em;color:#C2410C;min-height:1.1em;white-space:nowrap}
.streak.hot{animation:pop .35s}

/* the track */
.track{position:relative;margin:0 max(.7em,env(safe-area-inset-right)) 0 max(.7em,env(safe-area-inset-left));height:clamp(76px,21vh,150px);flex:none;
  border-radius:.9em;background:linear-gradient(180deg,var(--road-hi),var(--road));box-shadow:inset 0 0 0 3px #fff,0 4px 0 rgba(28,37,84,.25);overflow:hidden;--carw:calc(var(--laneh) * 1.9)}
.lane{position:absolute;left:0;right:0;height:50%}
#lane-you{top:0;border-bottom:3px dashed rgba(255,255,255,.65)}
#lane-rival{top:50%}
.flag{position:absolute;top:0;bottom:0;right:0;width:22px;
  background:conic-gradient(#fff 25%,#1B1F33 0 50%,#fff 0 75%,#1B1F33 0) 0 0/11px 11px;border-left:2px solid #fff}
.dots{position:absolute;left:0;right:0;top:50%;height:0}
.dots i{position:absolute;width:8px;height:8px;margin:-4px 0 0 -4px;border-radius:50%;background:rgba(255,255,255,.35);transition:background .3s,transform .3s}
.dots i.on{background:var(--brass);transform:scale(1.3)}
.car{position:absolute;left:0;top:6%;height:88%;aspect-ratio:2/1;will-change:transform}
.car svg{width:100%;height:100%;display:block;overflow:visible}
.car.hop svg{animation:hop .35s ease-out}
.car.turbo::before{content:"";position:absolute;right:92%;top:30%;width:120%;height:40%;border-radius:999px;
  background:linear-gradient(90deg,transparent,rgba(255,211,77,.9));animation:flame .6s ease-out forwards}
@keyframes hop{30%{transform:translateY(-14%) rotate(-4deg)}100%{transform:none}}
@keyframes flame{to{opacity:0;transform:scaleX(.3)}}

/* the fact and the pad */
.play{flex:1;min-height:0;display:grid;grid-template-rows:minmax(0,.75fr) minmax(0,1.6fr);gap:.5em;
  padding:.5em max(.7em,env(safe-area-inset-right)) max(.6em,env(safe-area-inset-bottom)) max(.7em,env(safe-area-inset-left))}
.factbox{container-type:size;min-height:0;background:#fff;border-radius:1em;box-shadow:0 4px 0 rgba(28,37,84,.25);display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--navy);position:relative;overflow:hidden}
.fact{font-weight:900;white-space:nowrap;font-size:min(34cqh,12.5cqw,104px);line-height:1;font-variant-numeric:tabular-nums}
.entry{display:inline-block;min-width:1.3em;text-align:center;color:var(--rival);border-bottom:.08em solid rgba(28,37,84,.25)}
.entry.empty{color:rgba(28,37,84,.28)}
.msg{font-weight:800;font-size:min(13cqh,6cqw,30px);min-height:1.2em;margin-top:.25em;color:#6B7395}
.factbox.ok{animation:okflash .45s}
.factbox.no{animation:shake .38s}
.factbox.reveal .entry{color:var(--good)}
.factbox.no .entry{color:var(--warn)}
@keyframes okflash{0%{background:#C9F5D6}100%{background:#fff}}
@keyframes shake{20%{transform:translateX(-8px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(3px)}}
@keyframes pop{40%{transform:scale(1.25)}}
.padwrap{container-type:size;min-height:0;display:grid;place-items:center}
.pad{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(4,1fr);gap:min(2.2cqh,10px);
  width:min(100cqw,140cqh,440px);height:min(100cqh,110cqw,480px)}
.key{border:0;border-radius:.6em;background:#fff;color:var(--navy);font-weight:900;font-family:var(--round);font-size:min(12cqh,15cqw,46px);
  box-shadow:0 4px 0 #9AA6D6;min-height:44px;min-width:44px;padding:0;touch-action:manipulation;transition:transform .06s}
.key.down,.key:active{transform:translateY(3px);box-shadow:0 1px 0 #9AA6D6;background:#FFF4C2}
.key[data-k=go]{background:linear-gradient(180deg,#5BD27E,var(--good));color:#fff;box-shadow:0 4px 0 #1D7C3B;font-size:min(9cqh,11cqw,36px)}
.key[data-k=back]{background:#E8ECFA;font-size:min(9cqh,11cqw,36px)}
.key:focus-visible{outline:3px solid var(--navy);outline-offset:2px}
@media (min-aspect-ratio:6/5){
  .play{grid-template-rows:1fr;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
}

/* the banner: count, Turbo!, the finish */
.banner{position:fixed;left:50%;top:42%;transform:translate(-50%,-50%) scale(.6);opacity:0;pointer-events:none;z-index:12;
  font:900 clamp(2.4em,13vmin,6em)/1 var(--round);color:#fff;white-space:nowrap;
  text-shadow:0 4px 0 #2E3C82,0 -3px 0 #2E3C82,4px 0 0 #2E3C82,-4px 0 0 #2E3C82,0 10px 24px rgba(0,0,0,.3)}
.banner.show{animation:banner 1s ease-out forwards}
.banner.gold{color:var(--brass)}
@keyframes banner{0%{opacity:0;transform:translate(-50%,-50%) scale(.5)}18%{opacity:1;transform:translate(-50%,-50%) scale(1.12)}
  30%{transform:translate(-50%,-50%) scale(1)}75%{opacity:1}100%{opacity:0;transform:translate(-50%,-50%) scale(1)}}
.float{position:fixed;z-index:13;pointer-events:none;font:900 1.6em/1 var(--round);color:var(--brass);text-shadow:0 2px 0 #2E3C82;animation:float .8s ease-out forwards}
@keyframes float{to{transform:translateY(-40px);opacity:0}}
@media (prefers-reduced-motion:reduce){.mascot{animation:none}}