/* ============================================
   ANIMATIONS & AMBIENT EFFECTS
   ============================================ */

/* Scroll indicator pulse */
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 0.8; transform: scaleY(1.3); }
}

/* Road lines moving */
@keyframes roadMove {
  0% { background-position: 0 0; }
  100% { background-position: 50px 0; }
}

/* Neon flicker */
@keyframes neonFlicker {
  0%, 100% { opacity: 1; }
  5% { opacity: 0.85; }
  10% { opacity: 1; }
  15% { opacity: 0.9; }
  20% { opacity: 1; }
  55% { opacity: 1; }
  57% { opacity: 0.7; }
  58% { opacity: 1; }
  60% { opacity: 0.85; }
  61% { opacity: 1; }
}

/* Floating dust particles */
@keyframes particleFloat {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translate(var(--drift-x, 100px), var(--drift-y, -200px)) scale(0.3);
    opacity: 0;
  }
}

.particle {
  position: absolute;
  width: var(--size, 3px);
  height: var(--size, 3px);
  background: var(--gold);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  animation: particleFloat var(--duration, 8s) var(--delay, 0s) ease-in-out infinite;
}

/* Gradient ambient shift */
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.section--cta {
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
}

/* Staggered reveal for grids */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 0.4s; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 0.5s; }
.reveal-stagger.is-visible > *:nth-child(7) { transition-delay: 0.6s; }
.reveal-stagger.is-visible > *:nth-child(8) { transition-delay: 0.7s; }
.reveal-stagger.is-visible > *:nth-child(9) { transition-delay: 0.8s; }
.reveal-stagger.is-visible > *:nth-child(10) { transition-delay: 0.9s; }

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

/* Card hover glow pulse */
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(212, 168, 83, 0); }
  50% { box-shadow: 0 0 30px rgba(212, 168, 83, 0.15); }
}

/* Hero title shimmer */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.hero__title-line--main {
  background-size: 200% 100%;
  animation: shimmer 6s ease-in-out infinite;
}

/* Film grain overlay animation */
@keyframes grainAnim {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-2%, -3%); }
  20% { transform: translate(3%, 1%); }
  30% { transform: translate(-1%, 2%); }
  40% { transform: translate(2%, -2%); }
  50% { transform: translate(-3%, 3%); }
  60% { transform: translate(1%, -1%); }
  70% { transform: translate(-2%, 2%); }
  80% { transform: translate(3%, -3%); }
  90% { transform: translate(-1%, 1%); }
}

.hero__grain {
  animation: grainAnim 0.5s steps(10) infinite;
}

/* Timeline node pop */
@keyframes nodePop {
  0% { transform: scale(1); }
  50% { transform: scale(1.5); }
  100% { transform: scale(1.3); }
}

/* Button ripple */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(255,255,255,0.2), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn:hover::after {
  opacity: 1;
}

/* Confetti on CTA hover */
@keyframes confettiFall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(-80px) rotate(720deg);
    opacity: 0;
  }
}

.confetti-piece {
  position: absolute;
  width: 6px;
  height: 6px;
  pointer-events: none;
  animation: confettiFall 1s ease-out forwards;
}

/* Smooth section transitions */
.section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--slate), transparent);
  opacity: 0.3;
}

/* Episode card open animation */
.episode-card__content {
  padding-top: 1.25rem;
}

/* Demo bar shine effect */
@keyframes barShine {
  0% { left: -100%; }
  100% { left: 200%; }
}

.demo-bar__fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: barShine 2s 1s ease-out forwards;
}

.demo-bar__fill {
  position: relative;
  overflow: hidden;
}

/* Sponsor card hover lift */
.sponsor-card--gold:hover {
  box-shadow: 0 20px 60px rgba(212, 168, 83, 0.15);
}

.sponsor-card--silver:hover {
  box-shadow: 0 20px 60px rgba(0, 212, 255, 0.1);
}

.sponsor-card--bronze:hover {
  box-shadow: 0 20px 60px rgba(123, 47, 247, 0.1);
}