*{box-sizing:border-box}
:root{
  --bg:#09111f; --panel:#10192f; --line:#2b3e70; --accent:#ffd34d; --accent2:#ff6e3a;
  --text:#edf3ff; --muted:#9eb3dc;
}
html,body{height:100%;margin:0}
body{
  background:radial-gradient(circle at top,#172954 0%,#09101d 65%);
  color:var(--text);font-family:Arial,Helvetica,sans-serif;padding:16px;
}
.shell{max-width:1120px;margin:0 auto}
.top{display:flex;justify-content:space-between;align-items:end;gap:16px;flex-wrap:wrap;margin-bottom:14px}
h1{margin:0;color:var(--accent);font-size:clamp(28px,4vw,46px);text-shadow:3px 3px 0 #000}
.sub{margin:6px 0 0;color:var(--muted)}
.back{
  color:#fff;text-decoration:none;padding:12px 16px;border-radius:12px;
  background:linear-gradient(180deg,#33476f,#253556);box-shadow:0 6px 0 #16213a
}
.hud{display:grid;grid-template-columns:1fr 1fr 1fr 1.4fr;gap:10px;margin-bottom:10px}
.hud-card{
  background:linear-gradient(180deg,#162241,#0f172c);border:2px solid var(--line);
  border-radius:14px;padding:10px 12px
}
.hud-card span{display:block;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.hud-card strong{display:block;font-size:24px;margin-top:4px}
.boss-bar{height:12px;background:#18223f;border-radius:999px;overflow:hidden;margin-top:10px;border:1px solid rgba(255,255,255,.08)}
#uiBoss{height:100%;width:100%;background:linear-gradient(90deg,#ffb13b,#ff4b4b)}
canvas{
  display:block;width:100%;aspect-ratio:16/9;background:#000;border-radius:16px;
  border:2px solid #30457e;image-rendering:pixelated;box-shadow:0 12px 30px rgba(0,0,0,.35)
}
.controls{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
button{
  border:none;border-radius:12px;padding:12px 16px;font-weight:900;cursor:pointer;
  background:linear-gradient(180deg,#ffd85f,#ffb400);color:#1a1200;box-shadow:0 6px 0 #a16a00
}
button.ghost{background:linear-gradient(180deg,#33476f,#253556);color:#eef4ff;box-shadow:0 6px 0 #16213a}
.tips{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}
.tips > div{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);
  border-radius:12px;padding:12px;color:var(--muted)
}
@media (max-width:760px){
  .hud{grid-template-columns:1fr 1fr}
  .tips{grid-template-columns:1fr}
}