html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 700px at 30% 10%, rgba(56,189,248,.08), transparent 60%),
              radial-gradient(900px 600px at 70% 40%, rgba(34,197,94,.06), transparent 60%),
              #020617;
  color: #e5e7eb;
  display: grid;
  place-items: start center;
  padding-top: 70px;
}

h1 {
  margin: 0 0 16px;
  font-size: 28px;
  letter-spacing: .2px;
}

.login-card {
  width: min(92vw, 420px);
  background: rgba(2, 6, 23, .72);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 18px 50px rgba(0,0,0,.55);
}

label {
  display: block;
  margin: 12px 0 6px;
  font-size: 13px;
  color: rgba(229,231,235,.8);
}

input {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.04);
  color: #e5e7eb;
  outline: none;
}

input:focus {
  border-color: rgba(56,189,248,.45);
}

button {
  margin-top: 14px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

.err {
  margin-top: 10px;
  color: #fca5a5;
  font-size: 13px;
}