/* ===== Animation System ===== */
/* Scroll reveals, hero animation, keyframes, reduced motion */

/* ——— Scroll Reveal System ——— */
/* Elements start hidden only when JS is present (progressive enhancement) */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-reveal) var(--ease-out),
              transform var(--duration-reveal) var(--ease-out);
  will-change: opacity, transform;
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0) translateX(0);
}

/* Reveal variants */
html.js [data-reveal="fade"] {
  transform: none;
}

html.js [data-reveal="fade-left"] {
  transform: translateX(-24px);
}

html.js [data-reveal="fade-right"] {
  transform: translateX(24px);
}

/* ——— Hero Word-by-Word Animation ——— */
.hero__word {
  display: inline-block;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-hero) var(--ease-out),
              transform var(--duration-hero) var(--ease-out);
}

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

/* ——— Keyframes ——— */

/* Scroll indicator line */
@keyframes scroll-line {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  40% {
    transform: scaleY(1);
    transform-origin: top;
  }
  40.1% {
    transform-origin: bottom;
  }
  80%, 100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

/* ——— Reduced Motion ——— */
/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__word {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__scroll-line {
    animation: none;
    opacity: 0.3;
  }
}