/* Engine Profit — Motion: keyframes, scroll-reveal, reduced-motion */

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scale-in {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes line-draw {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

@keyframes shimmer {
  from {
    background-position: -200% 0;
  }
  to {
    background-position: 200% 0;
  }
}

@keyframes gentle-drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(0, -10px, 0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---- Scroll reveal (driven by IntersectionObserver toggling .is-visible) ---- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
  will-change: transform, opacity;
}

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

[data-reveal="scale"] {
  transform: scale(0.96);
}

[data-reveal="scale"].is-visible {
  transform: scale(1);
}

[data-reveal-group] > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}

[data-reveal-group].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-group].is-visible > *:nth-child(1) { transition-delay: 0ms; }
[data-reveal-group].is-visible > *:nth-child(2) { transition-delay: 90ms; }
[data-reveal-group].is-visible > *:nth-child(3) { transition-delay: 180ms; }
[data-reveal-group].is-visible > *:nth-child(4) { transition-delay: 270ms; }
[data-reveal-group].is-visible > *:nth-child(5) { transition-delay: 360ms; }
[data-reveal-group].is-visible > *:nth-child(6) { transition-delay: 450ms; }

.line-rule {
  transform-origin: left center;
  animation: line-draw var(--duration-slow) var(--ease-out) forwards;
}

/* ---- Section border: a thin gold seam between sections, drawn in on scroll ---- */
.section-border {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  overflow: hidden;
  pointer-events: none;
}

.section-border::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-gold-border) 22%,
    var(--color-gold) 50%,
    var(--color-gold-border) 78%,
    transparent 100%
  );
  background-size: 220% 100%;
  background-position: 0 0;
  transform: scaleX(0);
  transform-origin: center;
  opacity: 0;
  transition: transform 1100ms var(--ease-out), opacity 800ms var(--ease-out);
}

.section-border.is-visible::before {
  transform: scaleX(1);
  opacity: 1;
  animation: section-border-shimmer 8s linear 1100ms infinite;
}

@keyframes section-border-shimmer {
  0% {
    background-position: 0% 0;
  }
  100% {
    background-position: -220% 0;
  }
}

/* ---- Reduced motion: collapse everything to instant, no parallax/loops ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal],
  [data-reveal-group] > * {
    opacity: 1 !important;
    transform: none !important;
  }

  [data-parallax] {
    transform: none !important;
  }

  .section-border::before {
    transition: none;
    animation: none;
    transform: scaleX(1);
    opacity: 1;
    background-position: 0 0;
  }
}