/* ==========================================================================
   buttons.css — Botón CTA único del sitio (L0-3 §E.5, CORRECCIONES HTML 3)
   Uso: <a class="btn btn-primary">  ·  variante: btn-outline-primary  ·  ancho completo: btn-block
   Cargado en todas las páginas, antes del CSS de cada página.
   ========================================================================== */
html .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: clamp(14px, 2vw, 18px) clamp(32px, 4vw, 52px);
  border: 2px solid transparent;
  border-radius: var(--radius-cta);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(13px, 1.1vw, 16px);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
html .btn:hover  { opacity: 0.88; transform: translateY(-2px); }
html .btn:active { opacity: 0.80; transform: translateY(0); }
/* Anillo doble: visible sobre fondo claro y oscuro */
html .btn:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 3px var(--color-white), 0 0 0 6px var(--color-primary);
}

html .btn-primary {
  background-color: var(--color-cta);
  border-color: var(--color-cta);
  color: var(--color-cta-ink);
}
html .btn-primary:hover { color: var(--color-cta-ink); }

html .btn-outline-primary {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}
html .btn-outline-primary:hover {
  opacity: 1;
  background-color: var(--color-primary);
  color: var(--color-white);
}

html .btn-block { width: 100%; }

@media (prefers-reduced-motion: reduce) {
  .btn:hover, .btn:active { transform: none; }
}