/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--accent-green);
  color: #04150c;
}

.btn--primary:hover,
.btn--primary:focus-visible {
  box-shadow: 0 0 24px rgba(57, 255, 136, 0.45);
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

/* ---- LANG TOGGLE ---- */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.6rem 0.7rem;
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
  border-color: var(--accent-cyan);
}

.lang-toggle__opt {
  color: var(--text-muted);
  transition: color var(--transition);
}

.lang-toggle__opt.is-active {
  color: var(--accent-cyan);
}

.lang-toggle__sep {
  color: var(--border);
}

/* ---- CARDS (stack / services / projects) ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), background var(--transition);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-4px);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.card__desc {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Stack category card */
.stack-card__category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-violet);
  margin-bottom: var(--space-2);
}

.stack-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
}

/* Project card */
.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), background var(--transition);
}

.project-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-4px);
}

.project-card__media {
  aspect-ratio: 16 / 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.project-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-3);
}

.project-card__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: var(--space-2);
}

.project-card__footer {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--border);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
  transition: gap var(--transition);
}

.project-card__link:hover,
.project-card__link:focus-visible {
  gap: 0.6rem;
}

.project-card__link svg {
  width: 14px;
  height: 14px;
}

.project-card__case-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---- CONTACT CARD ---- */
.contact__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: var(--space-3) var(--space-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.contact__card:hover,
.contact__card:focus-visible {
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-4px);
}

.contact__icon {
  width: 28px;
  height: 28px;
  color: var(--accent-cyan);
}

.contact__icon svg {
  width: 100%;
  height: 100%;
}

/* ---- WHATSAPP FLOATING BUTTON ----
   Fijo en pantalla durante toda la navegación. Aparece recién al
   salir del hero (que ya tiene su propio CTA grande) para no
   duplicar el mismo llamado a la acción dos veces en pantalla. */
.whatsapp-fab {
  position: fixed;
  right: var(--space-2);
  bottom: max(var(--space-2), env(safe-area-inset-bottom, 0px));
  z-index: 90;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-green);
  color: #04150c;
  box-shadow: 0 4px 20px rgba(57, 255, 136, 0.35);
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
}

.whatsapp-fab.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.whatsapp-fab:hover,
.whatsapp-fab:focus-visible {
  box-shadow: 0 4px 26px rgba(57, 255, 136, 0.55);
  transform: translateY(-2px) scale(1.05);
}

.whatsapp-fab svg {
  width: 28px;
  height: 28px;
}

@media (min-width: 48em) {
  .whatsapp-fab {
    right: var(--space-4);
    bottom: var(--space-4);
  }
}