.auth-shell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  background: var(--color-surface-muted);
}

.auth-card {
  width: min(420px, 100%);
  background: var(--color-white);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  padding: 2.5rem 2.25rem;
}

.auth-card__header h1 {
  margin: 0 0 0.4rem;
  font-size: 1.75rem;
}

.auth-card__header p {
  margin: 0 0 1.5rem;
  color: var(--color-neutral-500);
}

.auth-card__flash {
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

.auth-card__flash--alert {
  background: var(--color-light-cream);
  color: var(--color-dark-brown);
}

.auth-card__flash--notice {
  background: var(--color-light-green);
  color: var(--color-dark-green);
}

.auth-form {
  display: grid;
  gap: 1rem;
}

.auth-form__group label {
  display: block;
  font-weight: var(--font-weight-semibold);
  margin-bottom: 0.35rem;
}

.auth-form__group input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--color-neutral-300);
  font-size: var(--font-size-300);
}

.auth-form__group input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.auth-form__actions {
  margin-top: 0.5rem;
}

.auth-button {
  width: 100%;
  border: none;
  border-radius: 8px;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
  padding: 0.75rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.auth-button:hover,
.auth-button:focus {
  background: var(--color-accent-strong);
}

.auth-card__footer {
  margin-top: 1.75rem;
  text-align: center;
  color: var(--color-neutral-500);
}