/* 小乌龟：侧视角 + 真实行走（四条腿交替迈步） */
.turtle{left:0;bottom:84px;width:50px;animation:turtleWalk 32s linear infinite}
.turtle svg{animation:turtleBob 1.4s ease-in-out infinite}
.turtle .leg{transform-box:fill-box;transform-origin:50% 14%}
.turtle .leg-front-near{animation:legA 1.4s ease-in-out infinite}
.turtle .leg-back-near{animation:legB 1.4s ease-in-out infinite}
.turtle .leg-front-far{animation:legB 1.4s ease-in-out infinite}
.turtle .leg-back-far{animation:legA 1.4s ease-in-out infinite}

@keyframes turtleWalk{from{transform:translateX(-80px)}to{transform:translateX(110vw)}}
@keyframes turtleBob{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-3px) rotate(-2deg)}}
@keyframes legA{0%,100%{transform:rotate(0)}50%{transform:rotate(16deg)}}
@keyframes legB{0%,100%{transform:rotate(16deg)}50%{transform:rotate(0)}}