:root{
  --ui:#060914;--glass:rgba(7,11,24,.75);--line:rgba(173,206,255,.12);
  --space1:#0b1330;--space2:#091126;--space3:#070d1d;--neon:#4bd4ff;--accent:#7af7ff;--planet:#9aa4ff
}
html,body{margin:0;height:100%;background:black;overflow:hidden;-webkit-tap-highlight-color:transparent}
#game{display:block;width:100vw;height:100vh;background:black;touch-action:none}

/* Overlay UI */
.overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:16px;pointer-events:none}
.panel{pointer-events:auto;max-width:min(760px,92vw);background:var(--glass);border:1px solid var(--line);border-radius:16px;box-shadow:0 24px 60px rgba(0,0,0,.55);color:#e9f4ff;backdrop-filter:blur(8px)}
.panel .content{padding:22px}
.title{font:800 24px/1.2 system-ui,Segoe UI,Roboto,Arial,sans-serif;margin:0 0 6px;text-shadow:0 2px 12px rgba(75,212,255,.35)}
.muted{opacity:.9;font:14px/1.5 system-ui,Segoe UI,Roboto,Arial,sans-serif}
.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.btn{cursor:pointer;border:none;border-radius:12px;padding:12px 16px;font:800 14px/1 system-ui,Segoe UI,Roboto,Arial,sans-serif;letter-spacing:.4px;transform:translateY(0);transition:transform .06s ease,box-shadow .12s ease}
.btn.primary{background:linear-gradient(180deg,var(--neon),#1aa1cc);color:#03131b;box-shadow:0 10px 22px rgba(75,212,255,.35)}
.btn.ghost{background:transparent;color:#e9f4ff;border:1px solid var(--line)}
.btn:active{transform:translateY(1px)}
.hudTop{position:fixed;inset:12px 12px auto 12px;display:flex;justify-content:space-between;align-items:center;gap:8px;pointer-events:none}
.chip{pointer-events:auto;background:var(--glass);border:1px solid var(--line);border-radius:999px;color:#e9f4ff;padding:6px 12px;font:700 14px system-ui;backdrop-filter:blur(4px)}
.hide{display:none}
.helpList{margin:8px 0 0 18px}
.kbd{display:inline-block;border:1px solid var(--line);border-radius:6px;padding:0 6px;background:rgba(255,255,255,.06)}
.brandWatermark{position:fixed;left:10px;bottom:10px;color:#b8d7ff;font:700 12px/1.2 system-ui,Segoe UI,Roboto,Arial,sans-serif;background:rgba(7,11,24,.6);border:1px solid var(--line);border-radius:10px;padding:6px 9px;backdrop-filter:blur(3px);pointer-events:none;z-index:5}