body.page--auth {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.18), transparent 60%),
    var(--bg-alt);
}

body.page--signup {
  background:
    radial-gradient(
      circle at top right,
      rgba(34, 211, 238, 0.16),
      transparent 60%
    ),
    var(--bg-alt);
}

.auth-card {
  width: min(460px, 100%);
  background: var(--surface);
  border-radius: 20px;
  padding: clamp(2rem, 2vw + 1.5rem, 3rem);
  border: 1px solid var(--border);
  box-shadow: 0 40px 120px rgba(3, 6, 23, 0.5);
}

.auth-card h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
}

.auth-card p {
  margin: 0 0 1.6rem;
  color: var(--text-muted);
}

.auth-form label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.auth-form input {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.72);
  color: inherit;
  margin-bottom: 1rem;
}

.auth-form input:focus {
  outline: 2px solid rgba(56, 189, 248, 0.45);
}

body.page--signup .auth-form input:focus {
  outline: 2px solid rgba(34, 211, 238, 0.45);
}

.auth-submit {
  width: 100%;
  margin-top: 0.5rem;
}

.auth-feedback {
  margin-top: 1rem;
  min-height: 1.3rem;
  font-size: 0.95rem;
}

.auth-links {
  margin-top: 1.75rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
}