/* ============================================================
   MILIVA INC — ANIMATIONS & SCROLL EFFECTS
   Scroll-triggered reveals, parallax utility, hover micro-interactions.
   Driven by IntersectionObserver in js/main.js.
   ============================================================ */


/* ═══════════════════════════════════════════════════════════
   SCROLL-REVEAL BASE
   Elements start hidden and transition in when .is-visible
   is added by the IntersectionObserver.
   ═══════════════════════════════════════════════════════════ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-scroll) var(--ease-out),
    transform var(--duration-scroll) var(--ease-out);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Variant: slide from left */
.reveal--left {
  transform: translateX(-32px);
}
.reveal--left.is-visible {
  transform: translateX(0);
}

/* Variant: slide from right */
.reveal--right {
  transform: translateX(32px);
}
.reveal--right.is-visible {
  transform: translateX(0);
}

/* Variant: scale up */
.reveal--scale {
  transform: scale(0.95);
}
.reveal--scale.is-visible {
  transform: scale(1);
}

/* Variant: fade only (no movement) */
.reveal--fade {
  transform: none;
}
.reveal--fade.is-visible {
  opacity: 1;
}


/* ═══════════════════════════════════════════════════════════
   STAGGER DELAYS
   Apply to children inside a grid/flex for sequential reveal.
   Usage: <div class="reveal" style="--delay: 1">
   ═══════════════════════════════════════════════════════════ */

.reveal[style*="--delay"] {
  transition-delay: calc(var(--delay, 0) * 80ms);
}


/* ═══════════════════════════════════════════════════════════
   PARALLAX UTILITY
   Applied via JS — translateY is set as an inline style
   based on scroll position. CSS just controls smoothness.
   ═══════════════════════════════════════════════════════════ */

.parallax {
  will-change: transform;
  transition: transform 0.1s linear;
}

/* Parallax background image container */
.parallax-bg {
  position: absolute;
  inset: -20% 0;    /* overflow to allow vertical travel */
  will-change: transform;
}

.parallax-bg img,
.parallax-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}


/* ═══════════════════════════════════════════════════════════
   HOVER MICRO-INTERACTIONS
   ═══════════════════════════════════════════════════════════ */

/* Subtle lift — used on cards, load images */
.hover-lift {
  transition: transform var(--duration-base) var(--ease-out);
}
.hover-lift:hover {
  transform: translateY(-4px);
}

/* Image zoom inside container */
.hover-zoom {
  overflow: hidden;
}
.hover-zoom img {
  transition: transform var(--duration-slow) var(--ease-out);
}
.hover-zoom:hover img {
  transform: scale(1.05);
}

/* Glow border on hover */
.hover-glow:hover {
  box-shadow: var(--shadow-glow);
}


/* ═══════════════════════════════════════════════════════════
   GRADIENT OVERLAYS (for image sections)
   ═══════════════════════════════════════════════════════════ */

.overlay-gradient {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Bottom fade — for text on image */
.overlay-gradient--bottom {
  background: linear-gradient(
    to top,
    rgba(27, 31, 35, 0.95) 0%,
    rgba(27, 31, 35, 0.4) 40%,
    transparent 70%
  );
}

/* Full darken — for hero/parallax sections */
.overlay-gradient--hero {
  background: linear-gradient(
    to bottom,
    rgba(27, 31, 35, 0.5) 0%,
    rgba(27, 31, 35, 0.7) 50%,
    rgba(27, 31, 35, 0.9) 100%
  );
}


/* ═══════════════════════════════════════════════════════════
   REDUCED MOTION
   Respect user OS preference — disable all animations.
   ═══════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .parallax,
  .parallax-bg {
    transition: none;
    will-change: auto;
  }
  .ticker-track {
    animation: none;
  }
  .hover-lift:hover,
  .hover-zoom:hover img {
    transform: none;
  }
}