.header-mask {
  -webkit-mask-image: linear-gradient(to bottom, black 85%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 85%, transparent 100%);
  mask-size: 100% 100%;
  mask-repeat: no-repeat;
}

html {
  scroll-padding-top: 5.5rem;
  scroll-behavior: smooth;
}

.fade-section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.4,0,0.2,1), transform 0.7s cubic-bezier(0.4,0,0.2,1);
}

.fade-section.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes gradient-x {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 200% 50%;
  }
}

.animate-gradient-x {
  background-size: 200% 200%;
  animation: gradient-x 4s linear infinite;
}

.border-effect {
  position: relative;
  border-radius: 1rem; /* igual al rounded-2xl */
  z-index: 0;
}

.border-effect::before {
  content: '';
  position: absolute;
  inset: 0;
  padding: 2px; /* grosor del borde */
  border-radius: inherit;
  background: linear-gradient(
    115deg,
    #7c3aed,
    #6366f1,
    #9333ea,
    #6366f1,
    #7c3aed
  );
  background-size: 300% 300%;
  animation: border-shine 6s linear infinite;
  opacity: 0;
  transition: opacity 0.5s ease;
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: destination-out;
  z-index: -1;
}

.border-effect:hover::before {
  opacity: 1;
}

@keyframes border-shine {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}