.nk-login {
  position:fixed;
  inset:0;
  z-index:9999;
  display:grid;
  place-items:center;
  padding:20px;
  background:rgba(0,0,0,.94);
  color:#fff;
  font-family:Arial,"Noto Sans JP",sans-serif;
}
.nk-login[hidden] { display:none; }
.nk-login-card {
  width:min(100%,390px);
  padding:28px 22px 22px;
  border:2px solid #ff1493;
  border-radius:14px;
  background:#080808;
  box-shadow:0 0 34px rgba(255,20,147,.3);
  text-align:center;
}
.nk-login-card::before {
  content:"NO KIDDING";
  display:block;
  margin-bottom:8px;
  color:#00d8ff;
  font-size:13px;
  font-weight:900;
  letter-spacing:.22em;
}
.nk-login-card h2 { margin:0 0 8px; font-size:26px; }
.nk-login-card p { margin:0 0 20px; color:#bbb; font-size:14px; line-height:1.6; }
.nk-login-card label { display:block; text-align:left; font-size:13px; font-weight:800; }
.nk-login-card input {
  width:100%;
  height:52px;
  margin-top:7px;
  padding:0 15px;
  border:1px solid #777;
  border-radius:8px;
  outline:none;
  background:#111;
  color:#fff;
  font:700 20px/1 Arial,sans-serif;
  letter-spacing:.12em;
  box-sizing:border-box;
}
.nk-login-card input:focus { border-color:#00d8ff; box-shadow:0 0 0 3px rgba(0,216,255,.15); }
.nk-login-card button {
  width:100%;
  height:52px;
  margin-top:14px;
  border:0;
  border-radius:8px;
  background:#ff1493;
  color:#050505;
  font-size:16px;
  font-weight:950;
}
.nk-login-card button:disabled { opacity:.55; }
.nk-login-error { min-height:22px; margin:12px 0 0!important; color:#ffe000!important; font-weight:800; }
.nk-sync-error {
  position:fixed;
  z-index:9998;
  left:12px;
  right:12px;
  bottom:calc(12px + env(safe-area-inset-bottom));
  max-width:520px;
  margin:auto;
  padding:11px 14px;
  border:1px solid #ffe000;
  border-radius:8px;
  background:#111;
  color:#ffe000;
  font:800 12px/1.45 Arial,"Noto Sans JP",sans-serif;
  text-align:center;
}
body.nk-busy { cursor:progress; }