/* Fade-in on scroll */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger delay helpers */
.fade-in:nth-child(2) { transition-delay: 0.1s; }
.fade-in:nth-child(3) { transition-delay: 0.2s; }
.fade-in:nth-child(4) { transition-delay: 0.3s; }

/* Header link active indicator */
.header__link--active {
  transition: color 0.2s ease, background 0.2s ease;
}

/* Smooth hover for all interactive */
a, button, .btn, .service-card, .sfera-card {
  transition: all 0.3s ease;
}

/* Keyframes for hero entrance */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__title {
  animation: fadeInUp 0.8s ease forwards;
}

.hero__subtitle {
  animation: fadeInUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.hero__btn {
  animation: fadeInUp 0.8s ease 0.4s forwards;
  opacity: 0;
}