.addition-race{--hot:#ff729b;--deep:#b73c6b;--sky:#73d5ff}.addition-race-scene{position:absolute;inset:0;min-height:100%;overflow:hidden;background:#71cff7;isolation:isolate;touch-action:manipulation}.addition-race-stadium{position:absolute;z-index:0;inset:0;pointer-events:none}.addition-race-stadium img{object-fit:cover;object-position:center center;transform:scale(1.008)}.addition-race-scene:after{position:absolute;z-index:2;inset:0;pointer-events:none;background:linear-gradient(180deg,#ffffff18,transparent 31%,transparent 75%,#54384918);content:""}.addition-race-runner{position:absolute;z-index:7;bottom:25%;width:clamp(9.5rem,18vw,12.8rem);height:clamp(9.5rem,18vw,12.8rem);transform:translateX(-50%);transform-origin:50% 88%;will-change:left}.addition-race-runner-shadow{position:absolute;right:8%;bottom:5%;left:9%;height:12%;border-radius:50%;background:#613f443b;filter:blur(5px);transform-origin:center}.addition-race-runner-bob,.addition-race-tiger{width:100%;height:100%;transform-origin:50% 88%}.addition-race-tiger img{object-fit:contain;object-position:center}.addition-race-speed-lines{position:absolute;right:74%;bottom:34%;display:grid;gap:.55rem;width:6.5rem;animation:addition-speed .36s ease-out both}.addition-race-speed-lines i{display:block;height:.32rem;border-radius:999px;background:linear-gradient(90deg,transparent,#fff8c7 28%,#fff);box-shadow:0 0 10px #fff8a5}.addition-race-speed-lines i:nth-child(2){width:78%;margin-left:20%}.addition-race-speed-lines i:nth-child(3){width:58%;margin-left:38%}.addition-race-equation{position:absolute;z-index:12;top:27%;left:50%;display:flex;align-items:center;justify-content:center;gap:clamp(.45rem,2vw,1.15rem);min-width:min(31rem,72%);min-height:6.8rem;padding:.65rem 1.4rem;border-radius:2.3rem;color:#49365f;background:#fff9e8d9;box-shadow:0 12px 30px #49365f32;font-size:clamp(3.1rem,7vw,5.4rem);font-weight:1000;line-height:1;transform:translateX(-50%);backdrop-filter:blur(9px) saturate(1.08)}.addition-race-equation b{color:#ee6785}.addition-race-equation b:nth-of-type(2){color:#7058c1}.addition-race-equation strong{min-width:1em;color:#36a56a;text-align:center}.addition-race-answers{position:absolute;z-index:13;right:4%;bottom:2.6%;left:4%;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(.55rem,1.4vw,1rem)}.addition-race-answer{min-height:clamp(4.9rem,9vw,6.5rem);cursor:pointer;border:0;border-radius:2rem;color:#fff;font:1000 clamp(2.8rem,6vw,4rem)/1 system-ui,sans-serif;text-shadow:0 3px 0 #5337503c;box-shadow:inset 0 4px 4px #ffffff88,inset 0 -7px 0 #00000018,0 8px 0 var(--answer-shadow),0 14px 22px #4b3e6330;transition:filter .16s ease,transform .12s ease;-webkit-tap-highlight-color:transparent}.addition-race-answer.tone-1{--answer-shadow:#bd5274;background:linear-gradient(#ff9bb6,#ee668c)}.addition-race-answer.tone-2{--answer-shadow:#3897ad;background:linear-gradient(#86e5f2,#42bed4)}.addition-race-answer.tone-3{--answer-shadow:#bd8122;background:linear-gradient(#ffe47e,#f2b83e)}.addition-race-answer.tone-4{--answer-shadow:#6950b4;background:linear-gradient(#b9a2f7,#8066db)}.addition-race-answer:hover{filter:brightness(1.06);transform:translateY(-3px)}.addition-race-answer:active{transform:translateY(5px) scale(.98);box-shadow:inset 0 4px 4px #ffffff88,inset 0 -4px 0 #00000018,0 3px 0 var(--answer-shadow)}.addition-race-answer:focus-visible{outline:5px solid #fff;outline-offset:3px}.addition-race-answer.is-correct{--answer-shadow:#278d51;background:linear-gradient(#83e6a9,#46c67b)}.addition-race-answer.is-wrong{--answer-shadow:#b33e4c;background:linear-gradient(#ff9a9f,#ed6874)}.addition-race-feedback{position:absolute;z-index:14;right:1rem;bottom:calc(2.6% + clamp(5.7rem, 10vw, 7.4rem));margin:0;padding:.45rem .9rem;border-radius:999px;color:#fff;background:#503b69c9;box-shadow:0 6px 15px #402e5330;font-size:clamp(.8rem,2vw,1rem);font-weight:950;backdrop-filter:blur(7px)}.addition-race .prek-screen{min-height:clamp(590px,calc(100svh - 156px),760px)}.addition-race .prek-finish-emoji.has-image{width:160px!important;height:160px!important;overflow:visible!important}.addition-race .prek-finish-emoji img{object-fit:contain;object-position:center}@keyframes addition-speed{0%{opacity:0;transform:translateX(2.5rem) scale(.5)}to{opacity:1;transform:translateX(0) scale(1)}}@media (max-width:700px){.addition-race-equation{top:29%;min-width:min(25rem,88%);min-height:5.8rem;font-size:clamp(2.7rem,11vw,4.2rem)}.addition-race-stadium img{object-position:center center}.addition-race-runner{bottom:31%;width:clamp(7.4rem,31vw,9.2rem);height:clamp(7.4rem,31vw,9.2rem)}.addition-race-answers{right:2.5%;bottom:2.2%;left:2.5%;grid-template-columns:repeat(2,1fr);gap:.55rem}.addition-race-answer{min-height:4.4rem;border-radius:1.5rem;font-size:2.7rem}.addition-race-feedback{right:50%;bottom:20%;width:max-content;max-width:90%;transform:translateX(50%)}.addition-race .prek-screen{min-height:calc(100svh - 126px)}}@media (max-height:720px) and (min-width:701px){.addition-race-equation{top:25%;min-height:5.5rem;font-size:3.7rem}.addition-race-runner{bottom:22%;width:9rem;height:9rem}.addition-race-answer{min-height:4.8rem}}@media (prefers-reduced-motion:reduce){.addition-race-speed-lines{animation:none}}