:root[data-theme="dark"]{
  --bg:#0A0A0A; --surface:#141414; --surface-2:#1B1B1B;
  --text:#F0F0F0; --text-mid:#8A8A8A; --text-dim:#5A5A5A;
  --rule:#2A2A2A; --rule-strong:#3A3A3A;
  --accent:#C00000; --accent-bright:#E10600;
}
:root[data-theme="light"]{
  --bg:#F4F3F1; --surface:#FFFFFF; --surface-2:#FAFAF8;
  --text:#1A1A1A; --text-mid:#6A6A6A; --text-dim:#9A9A9A;
  --rule:#DCDCDC; --rule-strong:#C5C5C5;
  --accent:#C00000; --accent-bright:#C00000;
}
html,body{transition:background-color .25s ease,color .25s ease;}
#nfc-theme-toggle{
  position:fixed;top:14px;right:14px;z-index:9999;
  width:40px;height:40px;display:flex;align-items:center;justify-content:center;
  border-radius:8px;border:1px solid var(--rule-strong,#3A3A3A);
  background:var(--surface,#141414);color:var(--text,#F0F0F0);
  cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,.18);
  transition:background .2s,border-color .2s,color .2s,transform .15s;
  -webkit-tap-highlight-color:transparent;font:inherit;padding:0;
}
#nfc-theme-toggle:hover{border-color:var(--accent,#C00000);color:var(--accent,#C00000);transform:translateY(-1px);}
#nfc-theme-toggle svg{width:20px;height:20px;display:block;}
@media print{#nfc-theme-toggle{display:none !important;}}