body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 50% 0%, var(--surface-2), var(--surface-1) 60%);
  padding: 24px;
}

.login-form {
  --field-label-bg: var(--surface-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  width: 100%;
  max-width: 500px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}
.login-form h1 {
  font-size: 22px; margin: 0 0 2px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
}
.login-form .brand-sub {
  display: block; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.22em;
  color: var(--accent); margin-bottom: 28px;
}
.login-form .field { margin-top: 18px; }
.login-form .field:first-of-type { margin-top: 0; }
.login-form button {
  width: 100%;
  margin-top: 26px;
  padding: 13px;
  font-size: 14px;
  justify-content: center;
}
.login-form .error { color: var(--critical); font-size: 13px; margin-top: 14px; display: none; }
.login-form .error.is-visible { display: block; }