.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-7) var(--space-6);
}

.auth-brand {
  text-align: center;
  margin-bottom: var(--space-6);
}

.auth-brand .auth-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: var(--space-3);
}

.auth-brand h1 {
  font-size: var(--text-lg);
  margin: 0 0 4px;
  letter-spacing: 0.02em;
}

.auth-brand p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.auth-error-box {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.auth-footer {
  text-align: center;
  margin-top: var(--space-5);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.auth-theme-toggle { position: fixed; top: var(--space-4); right: var(--space-4); }

.error-shell {
  text-align: center;
  max-width: 420px;
}
.error-shell .error-code { font-size: 3.5rem; font-weight: 700; color: var(--color-primary); line-height: 1; margin-bottom: var(--space-3); }
.error-shell h1 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.error-shell p { color: var(--color-text-secondary); margin-bottom: var(--space-5); }

.install-card { max-width: 520px; }
.install-steps { display: flex; justify-content: space-between; margin-bottom: var(--space-6); gap: var(--space-1); }
.install-steps .step { flex: 1; text-align: center; font-size: var(--text-xs); color: var(--color-text-muted); position: relative; padding-top: 28px; }
.install-steps .step::before { content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 20px; height: 20px; border-radius: 50%; background: var(--color-surface-alt); border: 2px solid var(--color-border-strong); }
.install-steps .step.done::before { background: var(--color-success); border-color: var(--color-success); }
.install-steps .step.active { color: var(--color-primary); font-weight: 600; }
.install-steps .step.active::before { background: var(--color-primary); border-color: var(--color-primary); }
.install-welcome-icon { width: 56px; height: 56px; border-radius: var(--radius-lg); background: var(--color-primary-light); color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin: 0 auto var(--space-4); }