body { min-height: 100vh; display: flex; align-items: center; justify-content: center; position: relative; }
.brand { font-family: var(--font-heading); font-weight: 600; font-size: 24px; letter-spacing: .02em; text-align: center; margin-bottom: 26px; }
.brand span { color: var(--color-accent); }
form.blueprint { width: 320px; padding: 32px; background: var(--color-bg); }
.err { color: var(--color-accent-800); font-size: 13px; margin-bottom: 10px; min-height: 16px; }
.theme-toggle {
  position: absolute; top: 20px; right: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; padding: 0; border: 1px solid var(--color-divider);
  background: transparent; color: var(--color-text); cursor: pointer;
}
.theme-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }