*{box-sizing:border-box}html,body{height:100%;margin:0;font-family:"Rubik",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto}
body{background:linear-gradient(180deg,#0f172a,#111827);color:#e5e7eb}
#wrap{max-width:980px;margin:0 auto;padding:20px}
header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
h1{margin:0;font-size:28px}
#score{font-weight:600}
#game{width:100%;height:auto;border-radius:12px;background:linear-gradient(180deg,#1f2937 0%,#0b1220 100%);box-shadow:0 8px 30px rgba(0,0,0,.35);border:1px solid rgba(255,255,255,.06)}
#hud{display:flex;gap:12px;align-items:center;justify-content:space-between;margin:12px 0;flex-wrap:wrap}
#hint{opacity:.85}
button{background:#22c55e;color:#0b1220;border:0;border-radius:10px;padding:10px 16px;font-weight:700;cursor:pointer}
button:hover{filter:brightness(1.05)}
footer{opacity:.7;margin-top:10px}

/***** 游戏元素配色 *****/
.player{fill:#38bdf8}
.ground{fill:#374151}
.obstacle{fill:#f97316}
.coin{fill:#facc15}

/***** 响应式 *****/
@media (max-width:700px){
  h1{font-size:22px}
  #hint{font-size:14px}
}