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#ffffff2e}.grass-one{left:3%;top:4%}.grass-two{right:4%;bottom:3%}.crosswalk{position:absolute;z-index:1;background:repeating-linear-gradient(90deg,#fffc 0 15px,transparent 15px 27px)}.crosswalk-top{width:18%;height:54px;left:41%;top:30%}.crosswalk-bottom{width:18%;height:54px;left:43%;bottom:26%}.crosswalk-left,.crosswalk-right{width:54px;height:20%;background:repeating-linear-gradient(0deg,#fffc 0 15px,transparent 15px 27px);top:42%}.crosswalk-left{left:34%}.crosswalk-right{right:32%}.traffic-sign{position:absolute;z-index:2;width:clamp(70px,7vw,112px);height:clamp(70px,7vw,112px);object-fit:contain;filter:drop-shadow(0 8px 6px #1e403e40)}.sign-stop{left:3.2vw;bottom:4.2vh;transform:rotate(-5deg)}.sign-pedestrian{right:3.2vw;top:5vh;transform:rotate(6deg)}.game-shell{position:relative;z-index:3;width:min(1180px,calc(100vw - 44px));height:min(744px,calc(100vh - 20px));margin:10px auto;display:grid;grid-template-rows:auto minmax(240px,1fr) minmax(110px,.38fr) 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sound-pulse{to{transform:scale(1.06) rotate(2deg)}}@keyframes gentle-shake{25%{transform:translate(-4px)}75%{transform:translate(4px)}}@keyframes reward-pop{0%{opacity:0;transform:scale(.4) rotate(-5deg)}18%{opacity:1;transform:scale(1.1) rotate(2deg)}30%,78%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(.9)}}@keyframes firework-burst{0%{opacity:0;height:10px}18%{opacity:1}75%{opacity:1;height:72px}to{opacity:0;height:84px}}@media(max-height:820px){.game-shell{grid-template-rows:auto minmax(205px,1fr) minmax(92px,.34fr) auto;padding:10px 14px}h1{font-size:36px}.instruction{margin-top:2px;font-size:17px}.sound-slot{grid-template-rows:54px 1fr;padding:8px}.sound-button{width:52px;height:52px;border-radius:16px}.vehicle-card{min-height:72px}.vehicle-art{height:72px}.feedback{padding:9px 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