/* ==========================================================================
   Animations — Scroll reveal and hover effects
   ========================================================================== */

/* --- Fade-in on scroll --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Stagger children slightly when parent fades in */
.fade-in--visible > *:nth-child(2) {
  transition-delay: 0.1s;
}

.fade-in--visible > *:nth-child(3) {
  transition-delay: 0.2s;
}

/* --- Nav hover underline --- */
.site-nav__links a {
  position: relative;
}

.site-nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  transition: width var(--transition-speed) ease;
}

.site-nav__links a:hover::after {
  width: 100%;
}

/* --- CTA button glow on hover --- */
.hero__cta:hover {
  box-shadow: 0 4px 20px rgba(212, 168, 83, 0.3);
}

/* --- Book tags hover lift --- */
.book__tag {
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.book__tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(139, 123, 158, 0.2);
}

/* --- Image hover --- */
.about__tree-img,
.book__image img {
  transition: transform 0.5s ease;
}

.about__tree-img:hover,
.book__image img:hover {
  transform: scale(1.02);
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav__links a::after,
  .hero__cta,
  .book__tag,
  .about__tree-img,
  .book__image img {
    transition: none;
  }
}