:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: #0b0e15; color: #c6cdda;
  font: 400 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 20px;
}
.box {
  width: min(340px, 100%);
  background: #1e2430;
  border: 1px solid #2a3040;
  border-radius: 14px;
  padding: 26px 24px 24px;
  text-align: center;
}
.badge { margin-bottom: 10px; }
h1 { margin: 0 0 4px; font-size: 20px; font-weight: 500; color: #edeff5; }
.sub { margin: 0 0 20px; font-size: 13px; color: #8a93a5; }
form { text-align: left; }
label { display: block; font-size: 12px; color: #8a93a5; margin-bottom: 5px; }
input {
  width: 100%; height: 38px;
  background: #141824; color: #edeff5;
  border: 1px solid #3a4252; border-radius: 8px;
  padding: 0 11px; font: inherit; margin-bottom: 14px;
}
input:focus { outline: none; border-color: #57739a; box-shadow: 0 0 0 3px rgba(87,115,154,.22); }
button {
  width: 100%; height: 38px;
  background: #2f6b47; color: #eaf3ee;
  border: 1px solid #3d8659; border-radius: 8px;
  font: inherit; cursor: pointer;
}
button:hover:not(:disabled) { background: #377c53; }
button:disabled { opacity: .6; cursor: default; }
.err { color: #e08b8b; font-size: 12px; margin: 0 0 12px; }