:root{--bg:#0f1020;--bg2:#171a31;--card:#1c1f3a;--card2:#232648;
  --ink:#eef0ff;--muted:#9aa0c4;--line:#2f3460;
  --accent:#ffcc4d;--accent2:#ff8a3d;--good:#35e08c;--bad:#ff5c7a;}
*{box-sizing:border-box}
html,body{margin:0;padding:0;height:100%}
body{font-family:"Segoe UI",system-ui,-apple-system,Roboto,sans-serif;color:var(--ink);
  background:radial-gradient(900px 500px at 20% -10%,#1c3a55,transparent),
             radial-gradient(800px 500px at 110% 20%,#4a1f55,transparent),
             linear-gradient(180deg,var(--bg),#07070f);
  min-height:100dvh}
.top{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;max-width:1080px;margin:0 auto;padding:14px 18px 0}
.tt{font-weight:900;font-size:1.2rem}
.stats{display:flex;gap:8px;flex-wrap:wrap}
.stats span{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:.8rem;color:var(--muted)}
.stats b{color:var(--accent)}
.btns button,button.big{background:var(--card);border:1px solid var(--line);color:var(--ink);border-radius:14px;padding:9px 14px;font-size:1rem;cursor:pointer}
button.big{background:linear-gradient(90deg,#ffe08a,#ffb347);color:#241a00;font-weight:800;font-size:1.15rem;padding:13px 26px;border:none;box-shadow:0 8px 24px rgba(255,180,60,.25)}
button.big:hover{transform:translateY(-2px)}
.stage{max-width:1080px;margin:12px auto;padding:0 12px}
.runwrap{position:relative}
#run{width:100%;height:auto;display:block;border-radius:18px;border:1px solid var(--line);
  background:linear-gradient(180deg,#0f3a4d,#1f6f6a 55%,#3fae6b);box-shadow:0 18px 40px rgba(0,0,0,.4)}
#meter{position:absolute;right:10px;top:10px;width:auto;height:auto;border-radius:14px;border:1px solid var(--line);background:rgba(6,10,20,.85)}
.hud{position:absolute;left:14px;top:12px;background:rgba(6,10,20,.85);border:1px solid var(--line);border-radius:999px;
  padding:8px 16px;font-weight:800;font-size:1rem;color:var(--accent)}
.overlay,.gameover{position:fixed;inset:0;z-index:30;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  background:radial-gradient(800px 500px at 50% -10%,#143A35,transparent),rgba(8,8,18,.95);text-align:center;padding:20px}
.overlay h1{font-size:2.4rem;margin:0;letter-spacing:1px}
.overlay h1 span{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.overlay .how{max-width:560px;line-height:1.6;color:var(--muted);margin:0;font-size:.95rem}
.dimx{color:#8fd0ff;font-size:.92em}
.err{color:var(--bad);font-size:.85rem;min-height:1.2em;margin:0}
.gameover h2{font-size:2.2rem;margin:0;color:var(--bad)}
#goStats{color:var(--muted);font-size:1.05rem;margin:0}
.browcenter{display:flex;gap:10px}
.home{position:fixed;left:14px;bottom:12px;z-index:40;color:var(--muted);text-decoration:none;font-size:.82rem;padding:8px 12px;background:var(--card);border:1px solid var(--line);border-radius:999px}
.home:hover{color:var(--accent)}
@media (max-width:760px){.overlay h1{font-size:1.7rem}}