/* ==========================================================================
   Venom Racing — Animations
   Keyframes and utility classes for fades, slides, glow, hover effects,
   and loading states. Paired with IntersectionObserver logic in
   assets/js/animations.js which toggles the `.is-visible` class.
   ========================================================================== */

/* ---------------------------------------------------------------------
   Fade
   --------------------------------------------------------------------- */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  opacity: 0;
  transition: opacity var(--transition-slow) ease;
}

.fade-in.is-visible {
  opacity: 1;
}

/* ---------------------------------------------------------------------
   Slide
   --------------------------------------------------------------------- */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease;
}

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

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease;
}

.slide-in-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

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

.slide-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease;
}

.slide-in-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* ---------------------------------------------------------------------
   Glow
   --------------------------------------------------------------------- */
@keyframes glowPulse {
  0%,
  100% {
    box-shadow: var(--shadow-glow-sm);
  }
  50% {
    box-shadow: var(--shadow-glow-lg);
  }
}

.glow-pulse {
  animation: glowPulse 2.4s ease-in-out infinite;
}

.glow-on-hover {
  transition: box-shadow var(--transition-base);
}

.glow-on-hover:hover {
  box-shadow: var(--shadow-glow-md);
}

/* Animated gradient — subtle moving sheen for premium accents */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.gradient-animated {
  background: linear-gradient(120deg, var(--color-red-dark), var(--color-red-bright), var(--color-red-dark));
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

/* ---------------------------------------------------------------------
   Parallax
   Applied via JS (transform: translateY) driven by scroll position;
   this class only opts an element into GPU-accelerated transforms.
   --------------------------------------------------------------------- */
.parallax {
  will-change: transform;
}

/* ---------------------------------------------------------------------
   Floating particles — very subtle ambient drift
   --------------------------------------------------------------------- */
@keyframes particleDrift {
  0% {
    transform: translate(0, 0);
    opacity: 0;
  }
  10% {
    opacity: var(--particle-opacity, 0.5);
  }
  90% {
    opacity: var(--particle-opacity, 0.5);
  }
  100% {
    transform: translate(var(--drift-x, 20px), -120px);
    opacity: 0;
  }
}

.particle-field {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  bottom: 0;
  width: 3px;
  height: 3px;
  border-radius: var(--radius-full);
  background-color: var(--color-red-bright);
  animation: particleDrift 8s linear infinite;
}

/* ---------------------------------------------------------------------
   Hover
   --------------------------------------------------------------------- */
.hover-lift {
  transition: transform var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-6px);
}

.hover-scale {
  transition: transform var(--transition-base);
}

.hover-scale:hover {
  transform: scale(1.05);
}

/* ---------------------------------------------------------------------
   Loading
   --------------------------------------------------------------------- */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-graphite-light);
  border-top-color: var(--color-red-bright);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

@keyframes skeletonPulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

.skeleton {
  background-color: var(--color-graphite-light);
  border-radius: var(--radius-md);
  animation: skeletonPulse 1.5s ease-in-out infinite;
}

/* ---------------------------------------------------------------------
   Counter — pairs with assets/js/main.js number count-up
   --------------------------------------------------------------------- */
@keyframes counterPopIn {
  from {
    opacity: 0;
    transform: scale(0.85);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.stat__number.is-visible {
  animation: counterPopIn var(--transition-slow) ease-out;
}

/* ---------------------------------------------------------------------
   Reduced motion — respect user preference
   --------------------------------------------------------------------- */
@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;
  }
}

/* ---------------------------------------------------------------------
   Preloader + page transition
   Reveals a branded loading screen on first paint, then fades away once
   assets load (hidden by main.js, with a hard safety timeout). The
   `.is-leaving` state fades the page out before internal navigation for
   a continuous feel between pages.
   --------------------------------------------------------------------- */
.preloader {
  position: fixed;
  inset: 0;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  background-color: var(--color-carbon);
  background-image: var(--bg-atmosphere);
  transition: opacity var(--transition-slow) ease, visibility var(--transition-slow) ease;
}

.preloader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader__word {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  color: var(--color-white);
  opacity: 0;
  animation: fadeIn var(--transition-slow) ease 120ms forwards;
}

.preloader__bar {
  width: 120px;
  height: 3px;
  border-radius: var(--radius-full);
  background-color: var(--color-graphite-light);
  overflow: hidden;
}

.preloader__bar::before {
  content: '';
  display: block;
  width: 40%;
  height: 100%;
  border-radius: var(--radius-full);
  background-color: var(--color-red-bright);
  box-shadow: var(--shadow-glow-sm);
  animation: preloaderSlide 1.1s ease-in-out infinite;
}

@keyframes preloaderSlide {
  0% {
    transform: translateX(-120%);
  }
  100% {
    transform: translateX(320%);
  }
}

/* Fade the page out before internal navigation */
body.is-leaving {
  opacity: 0;
  transition: opacity 200ms ease;
}

@media (prefers-reduced-motion: reduce) {
  .preloader__bar::before {
    animation: none;
  }
}

/* ---------------------------------------------------------------------
   Ambient background — sitewide moving red lighting
   Injected once per page by main.js (a fixed layer behind all content).
   Three large, soft, slow-drifting red orbs give every page subtle
   living atmosphere. Pure compositor transforms; frozen under
   prefers-reduced-motion by the global rule above.
   --------------------------------------------------------------------- */
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.ambient__orb {
  position: absolute;
  border-radius: var(--radius-full);
  filter: blur(70px);
  opacity: 0.38;
  background: radial-gradient(circle, rgba(224, 30, 46, 0.28), transparent 70%);
  will-change: transform;
}

.ambient__orb--1 {
  width: 46vw;
  height: 46vw;
  top: -8vw;
  left: -6vw;
  animation: orbDrift1 26s ease-in-out infinite;
}

.ambient__orb--2 {
  width: 38vw;
  height: 38vw;
  right: -6vw;
  bottom: -10vw;
  opacity: 0.32;
  background: radial-gradient(circle, rgba(179, 18, 31, 0.26), transparent 70%);
  animation: orbDrift2 32s ease-in-out infinite;
}

.ambient__orb--3 {
  width: 30vw;
  height: 30vw;
  top: 42%;
  left: 55%;
  opacity: 0.22;
  animation: orbDrift3 38s ease-in-out infinite;
}

@keyframes orbDrift1 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(6vw, 4vw); }
}

@keyframes orbDrift2 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-5vw, -3vw); }
}

@keyframes orbDrift3 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-4vw, 5vw); }
}

/* Lighten the load on small screens: drop the third orb, soften blur. */
@media (max-width: 599px) {
  .ambient__orb {
    filter: blur(50px);
  }
  .ambient__orb--3 {
    display: none;
  }
}