/* ============================================
   BuildSheet — Animation Keyframes & Scroll Reveals
   ============================================ */

/* ── Keyframes ──────────────────────────────── */

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-20px); }
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-12px) rotate(3deg); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-accent-glow); }
  50%      { box-shadow: 0 0 0 12px transparent; }
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes drawLine {
  from { stroke-dashoffset: 1000; }
  to   { stroke-dashoffset: 0; }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes rotateGlow {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ── Scroll-triggered animations ────────────── */

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slower) var(--ease-out),
    transform var(--duration-slower) var(--ease-out);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Directional variants */
.animate-on-scroll--left {
  opacity: 0;
  transform: translateX(-40px);
  transition:
    opacity var(--duration-slower) var(--ease-out),
    transform var(--duration-slower) var(--ease-out);
}

.animate-on-scroll--left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.animate-on-scroll--right {
  opacity: 0;
  transform: translateX(40px);
  transition:
    opacity var(--duration-slower) var(--ease-out),
    transform var(--duration-slower) var(--ease-out);
}

.animate-on-scroll--right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.animate-on-scroll--scale {
  opacity: 0;
  transform: scale(0.92);
  transition:
    opacity var(--duration-slower) var(--ease-out),
    transform var(--duration-slower) var(--ease-out);
}

.animate-on-scroll--scale.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays for groups */
.stagger-1 { transition-delay: 100ms; }
.stagger-2 { transition-delay: 200ms; }
.stagger-3 { transition-delay: 300ms; }
.stagger-4 { transition-delay: 400ms; }
.stagger-5 { transition-delay: 500ms; }
.stagger-6 { transition-delay: 600ms; }

/* ── Always-on micro animations ─────────────── */

.animate-float {
  animation: float 6s var(--ease-default) infinite;
}

.animate-float-slow {
  animation: floatSlow 8s var(--ease-default) infinite;
}

.animate-float-delayed {
  animation: float 7s var(--ease-default) infinite;
  animation-delay: -2s;
}

.animate-pulse {
  animation: pulse 2s var(--ease-default) infinite;
}

.animate-gradient {
  background-size: 200% 200%;
  animation: gradientShift 4s ease infinite;
}

.animate-shimmer {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.05) 50%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
}

/* ── Prefers Reduced Motion ─────────────────── */

@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;
  }

  .animate-on-scroll,
  .animate-on-scroll--left,
  .animate-on-scroll--right,
  .animate-on-scroll--scale {
    opacity: 1;
    transform: none;
    transition: none;
  }
}