:root { color-scheme: light; font-family: "Microsoft YaHei", "PingFang SC", sans-serif; }
* { box-sizing: border-box; }
html, body { width:100%; height:100%; margin:0; overflow:hidden; background:#c7f77a; }
body { display:grid; place-items:center; touch-action:none; overscroll-behavior:none; }
#game-shell { position:relative; width:min(100vw,56.25vh); height:min(100vh,177.778vw); background:#67d8f2; box-shadow:0 0 40px #1f704c55; overflow:hidden; }
#game { display:block; width:100%; height:100%; touch-action:none; }
#rotate-tip { display:none; position:absolute; inset:0; place-items:center; background:#55cbea; color:#fff; font-size:7vw; font-weight:900; text-shadow:0 3px 0 #257397; }
@media (orientation:landscape) and (max-height:600px) { #rotate-tip { display:grid; } }