:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, sans-serif;
  color: #eaf2ff;
  background: radial-gradient(120% 120% at 50% 0%, #1b3a6b 0%, #0c1a33 70%);
}
.wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.card {
  width: min(92vw, 360px);
  padding: 30px 28px;
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 16px;
  backdrop-filter: blur(8px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, .45);
}
.card h1 { margin: 0; font-size: 30px; letter-spacing: .5px; }
.card .sub { margin: 2px 0 18px; font-size: 13px; color: #9fb6d8; }
.card h2 { margin: 0 0 14px; font-size: 20px; }
label { display: block; font-size: 12px; color: #9fb6d8; margin: 14px 0 4px; }
input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 9px;
  border: 1px solid rgba(255, 255, 255, .18);
  background: rgba(0, 0, 0, .25);
  color: #fff;
  font-size: 15px;
  outline: none;
}
input:focus { border-color: #4f9bff; }
.btn {
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}
.btn.primary { background: #4f9bff; color: #06122a; }
.err { margin: 10px 0 0; color: #ff8d8d; font-size: 13px; }
.muted { margin-top: 16px; font-size: 13px; color: #9fb6d8; text-align: center; }
.muted a { color: #7db4ff; }