:root{
  --bg-deep:#070f0c;
  --panel-border:rgba(130,210,180,0.16);
  --snake-head:#5fe89a;
  --snake-mid:#2fa968;
  --gold:#ffcb57;
  --teal:#5fe8d0;
  --text-primary:#eef7f0;
  --text-muted:#7fa08e;
  --text-faint:#4f6b5e;
  --radius-lg:24px;
  --radius-md:16px;
  --radius-sm:11px;
  --radius-pill:999px;
  --shadow-deep:0 24px 60px rgba(0,0,0,0.55);
  --font-cjk:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;}
html{overscroll-behavior:none;}
body{
  min-height:100vh;
  min-height:100dvh;
  background:
    radial-gradient(circle at 15% -10%, rgba(95,232,154,0.10), transparent 42%),
    radial-gradient(circle at 100% 105%, rgba(95,232,208,0.08), transparent 45%),
    var(--bg-deep);
  color:var(--text-primary);
  font-family:var(--font-cjk);
  overscroll-behavior:none;
  touch-action:manipulation;
  -webkit-user-select:none;
  user-select:none;
}
button{font-family:inherit;border:none;background:none;color:inherit;cursor:pointer;}
button:disabled{cursor:default;opacity:0.45;}
button:focus-visible{outline:2px solid var(--teal);outline-offset:2px;border-radius:6px;}
svg{display:block;}