/**
 * Lecture Mind - Premium Background Animations
 *
 * Lightweight, GPU-friendly animations:
 * - Animated noise texture
 * - Floating particles
 * - Aurora/gradient effects
 * - Parallax support
 *
 * All animations use transform/opacity for GPU acceleration.
 * Respects prefers-reduced-motion.
 */

/* ============================================
   ANIMATED NOISE TEXTURE
   ============================================ */
.noise-overlay {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

.dark .noise-overlay {
  opacity: 0.05;
}

/* ============================================
   FLOATING PARTICLES
   ============================================ */
.particles-container {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: var(--particle-size, 4px);
  height: var(--particle-size, 4px);
  background: var(--particle-color, var(--primary));
  border-radius: 50%;
  opacity: 0;
  /* Removed will-change - apply only during animation via JS */
  animation: particleFloat var(--particle-duration, 15s) var(--particle-delay, 0s) infinite;
}

@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(100vh) scale(0);
  }
  10% {
    opacity: var(--particle-opacity, 0.6);
    transform: translateY(90vh) scale(1);
  }
  90% {
    opacity: var(--particle-opacity, 0.6);
    transform: translateY(10vh) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(0) scale(0);
  }
}

/* Particle variations */
.particle:nth-child(1) {
  left: 5%;
  --particle-size: 3px;
  --particle-duration: 20s;
  --particle-delay: 0s;
  --particle-opacity: 0.4;
  --particle-color: var(--primary);
}

.particle:nth-child(2) {
  left: 15%;
  --particle-size: 5px;
  --particle-duration: 18s;
  --particle-delay: 2s;
  --particle-opacity: 0.5;
  --particle-color: var(--accent);
}

.particle:nth-child(3) {
  left: 25%;
  --particle-size: 2px;
  --particle-duration: 22s;
  --particle-delay: 4s;
  --particle-opacity: 0.3;
  --particle-color: var(--primary);
}

.particle:nth-child(4) {
  left: 40%;
  --particle-size: 4px;
  --particle-duration: 16s;
  --particle-delay: 1s;
  --particle-opacity: 0.6;
  --particle-color: var(--accent);
}

.particle:nth-child(5) {
  left: 55%;
  --particle-size: 3px;
  --particle-duration: 24s;
  --particle-delay: 3s;
  --particle-opacity: 0.4;
  --particle-color: var(--primary);
}

.particle:nth-child(6) {
  left: 70%;
  --particle-size: 6px;
  --particle-duration: 19s;
  --particle-delay: 5s;
  --particle-opacity: 0.5;
  --particle-color: var(--accent);
}

.particle:nth-child(7) {
  left: 80%;
  --particle-size: 2px;
  --particle-duration: 21s;
  --particle-delay: 2.5s;
  --particle-opacity: 0.3;
  --particle-color: var(--primary);
}

.particle:nth-child(8) {
  left: 92%;
  --particle-size: 4px;
  --particle-duration: 17s;
  --particle-delay: 4.5s;
  --particle-opacity: 0.5;
  --particle-color: var(--accent);
}

/* ============================================
   AURORA / GRADIENT BLOBS
   ============================================ */
.aurora-container {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.aurora-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  /* Removed will-change - GPU memory optimization */
  animation: auroraFloat 20s ease-in-out infinite;
  animation-play-state: running;
}

.aurora-blob--primary {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  top: -10%;
  left: -10%;
  animation-delay: 0s;
}

.aurora-blob--accent {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  bottom: -5%;
  right: -5%;
  animation-delay: -10s;
  animation-duration: 25s;
}

.aurora-blob--tertiary {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--success) 0%, transparent 70%);
  top: 40%;
  left: 60%;
  animation-delay: -5s;
  animation-duration: 22s;
  opacity: 0.2;
}

@keyframes auroraFloat {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  25% {
    transform: translate(30px, -20px) scale(1.05);
  }
  50% {
    transform: translate(-20px, 30px) scale(0.95);
  }
  75% {
    transform: translate(20px, 20px) scale(1.02);
  }
}

/* Dark mode aurora adjustments */
.dark .aurora-blob {
  opacity: 0.3;
  filter: blur(100px);
}

.dark .aurora-blob--primary {
  background: radial-gradient(circle, rgba(6, 182, 212, 0.6) 0%, transparent 70%);
}

.dark .aurora-blob--accent {
  background: radial-gradient(circle, rgba(139, 92, 246, 0.5) 0%, transparent 70%);
}

.dark .aurora-blob--tertiary {
  background: radial-gradient(circle, rgba(34, 197, 94, 0.4) 0%, transparent 70%);
}

/* ============================================
   LIGHT BEAMS
   ============================================ */
.light-beam {
  position: absolute;
  width: 2px;
  height: 100%;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--primary) 30%,
    var(--accent) 70%,
    transparent 100%
  );
  opacity: 0;
  /* Removed will-change - performance optimization */
  animation: lightBeam 8s ease-in-out infinite;
}

.light-beam:nth-child(1) {
  left: 20%;
  animation-delay: 0s;
}

.light-beam:nth-child(2) {
  left: 50%;
  animation-delay: 2.5s;
}

.light-beam:nth-child(3) {
  left: 80%;
  animation-delay: 5s;
}

@keyframes lightBeam {
  0%, 100% {
    opacity: 0;
    transform: translateY(-100%) scaleY(0.5);
  }
  30% {
    opacity: 0.15;
    transform: translateY(0) scaleY(1);
  }
  70% {
    opacity: 0.15;
    transform: translateY(0) scaleY(1);
  }
  100% {
    opacity: 0;
    transform: translateY(100%) scaleY(0.5);
  }
}

.dark .light-beam {
  opacity: 0;
  animation-name: lightBeamDark;
}

@keyframes lightBeamDark {
  0%, 100% {
    opacity: 0;
    transform: translateY(-100%) scaleY(0.5);
  }
  30% {
    opacity: 0.1;
    transform: translateY(0) scaleY(1);
  }
  70% {
    opacity: 0.1;
    transform: translateY(0) scaleY(1);
  }
  100% {
    opacity: 0;
    transform: translateY(100%) scaleY(0.5);
  }
}

/* ============================================
   PARALLAX LAYERS
   ============================================ */
.parallax-layer {
  position: absolute;
  inset: 0;
  /* will-change applied via JS during scroll */
  pointer-events: none;
}

.parallax-layer--slow {
  /* Moves at 0.3x scroll speed - set via JS */
}

.parallax-layer--medium {
  /* Moves at 0.5x scroll speed - set via JS */
}

.parallax-layer--fast {
  /* Moves at 0.7x scroll speed - set via JS */
}

/* ============================================
   GLOW EFFECTS
   ============================================ */
.glow-ring {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  border: 1px solid var(--primary);
  opacity: 0.1;
  animation: glowPulse 4s ease-in-out infinite;
}

.glow-ring:nth-child(1) {
  top: -200px;
  left: -200px;
}

.glow-ring:nth-child(2) {
  animation-delay: 1s;
  width: 700px;
  height: 700px;
  top: -250px;
  left: -250px;
}

.glow-ring:nth-child(3) {
  animation-delay: 2s;
  width: 800px;
  height: 800px;
  top: -300px;
  left: -300px;
}

@keyframes glowPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.2;
  }
}

/* ============================================
   MORPHING GRADIENT BACKGROUND
   ============================================ */
.morph-bg {
  position: absolute;
  inset: -50%;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(6, 182, 212, 0.15) 0%, transparent 40%),
    radial-gradient(ellipse at 80% 70%, rgba(139, 92, 246, 0.12) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 50%, rgba(34, 197, 94, 0.08) 0%, transparent 50%);
  animation: morphBg 30s ease-in-out infinite;
  /* Removed will-change - GPU memory optimization */
}

@keyframes morphBg {
  0%, 100% {
    transform: rotate(0deg) scale(1);
  }
  33% {
    transform: rotate(5deg) scale(1.05);
  }
  66% {
    transform: rotate(-3deg) scale(0.98);
  }
}

.dark .morph-bg {
  background:
    radial-gradient(ellipse at 20% 30%, rgba(6, 182, 212, 0.2) 0%, transparent 40%),
    radial-gradient(ellipse at 80% 70%, rgba(139, 92, 246, 0.18) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 50%, rgba(34, 197, 94, 0.1) 0%, transparent 50%);
}

/* ============================================
   HERO ENHANCED BACKGROUND
   ============================================ */
.hero-bg-enhanced {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

/* ============================================
   PREFERS REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .particle,
  .aurora-blob,
  .light-beam,
  .glow-ring,
  .morph-bg {
    animation: none !important;
  }

  .particle {
    opacity: 0.3;
    transform: none;
  }

  .aurora-blob {
    opacity: 0.2;
  }

  .light-beam {
    display: none;
  }

  .morph-bg {
    transform: none;
  }
}

/* ============================================
   3D CARD TILT EFFECT - Enhanced with Spring Physics
   ============================================ */
.tilt-card {
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform var(--duration-medium, 400ms) var(--spring-smooth, cubic-bezier(0.22, 0.61, 0.36, 1));
}

.tilt-card:hover {
  /* JS will set --rotateX and --rotateY */
  transform: rotateX(var(--rotateX, 0deg)) rotateY(var(--rotateY, 0deg)) translateZ(10px);
}

.tilt-card .tilt-content {
  transform: translateZ(20px);
  transition: transform var(--duration-medium, 400ms) var(--spring-bounce-1, cubic-bezier(0.34, 1.56, 0.64, 1));
}

.tilt-card:hover .tilt-content {
  transform: translateZ(40px);
}

/* 3D Card shine effect */
.tilt-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.15) 0%,
    transparent 50%,
    rgba(0, 0, 0, 0.05) 100%
  );
  opacity: 0;
  transition: opacity var(--duration-small, 250ms) ease;
  pointer-events: none;
  z-index: 1;
}

.tilt-card:hover::before {
  opacity: 1;
}

/* ============================================
   BUTTON RIPPLE EFFECT
   ============================================ */
.btn {
  position: relative;
  overflow: hidden;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: scale(0);
  animation: rippleEffect 0.6s ease-out forwards;
  pointer-events: none;
}

@keyframes rippleEffect {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ============================================
   CURSOR GLOW TRAIL
   ============================================ */
.cursor-glow {
  position: fixed;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(6, 182, 212, 0.15) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease;
  opacity: 0;
  mix-blend-mode: screen;
}

.cursor-glow.active {
  opacity: 1;
}

.dark .cursor-glow {
  background: radial-gradient(
    circle,
    rgba(6, 182, 212, 0.25) 0%,
    transparent 70%
  );
}

/* ============================================
   MAGNETIC BUTTON EFFECT
   ============================================ */
.magnetic-btn {
  transition: transform var(--duration-fast) var(--ease-out);
}

/* ============================================
   ANIMATED COUNTER
   ============================================ */
.counter-value {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   TYPEWRITER EFFECT
   ============================================ */
.typewriter {
  display: inline;
}

.typewriter-cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--primary);
  margin-left: 2px;
  animation: typewriterBlink 0.8s infinite;
  vertical-align: text-bottom;
}

@keyframes typewriterBlink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ============================================
   SECTION COLOR TRANSITIONS
   ============================================ */
.section-gradient-bg {
  position: relative;
}

.section-gradient-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
  z-index: -1;
}

.features-section::before {
  background: linear-gradient(180deg, transparent 0%, rgba(6, 182, 212, 0.03) 50%, transparent 100%);
}

.how-it-works-section::before {
  background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.03) 50%, transparent 100%);
}

.tech-section::before {
  background: linear-gradient(180deg, transparent 0%, rgba(34, 197, 94, 0.03) 50%, transparent 100%);
}

.section-gradient-bg.in-view::before {
  opacity: 1;
}

.dark .features-section::before {
  background: linear-gradient(180deg, transparent 0%, rgba(6, 182, 212, 0.05) 50%, transparent 100%);
}

.dark .how-it-works-section::before {
  background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.05) 50%, transparent 100%);
}

.dark .tech-section::before {
  background: linear-gradient(180deg, transparent 0%, rgba(34, 197, 94, 0.05) 50%, transparent 100%);
}

/* ============================================
   INTERACTIVE PARTICLES
   ============================================ */
.particle.interactive {
  transition: transform 0.3s ease-out;
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */
@media (max-width: 767px) {
  /* Disable cursor effects on mobile */
  .cursor-glow {
    display: none;
  }

  /* Disable tilt on mobile */
  .tilt-card:hover {
    transform: none;
  }

  /* Disable magnetic on mobile */
  .magnetic-btn {
    transform: none !important;
  }
  /* Reduce particle count on mobile */
  .particle:nth-child(n+5) {
    display: none;
  }

  /* Simplify aurora on mobile */
  .aurora-blob {
    filter: blur(60px);
  }

  .aurora-blob--tertiary {
    display: none;
  }

  /* Hide light beams on mobile */
  .light-beam {
    display: none;
  }

  /* Reduce morph bg animation */
  .morph-bg {
    animation-duration: 45s;
  }

  /* Reduce glow rings */
  .glow-ring:nth-child(n+2) {
    display: none;
  }
}

/* ============================================
   LIQUID GRADIENT EFFECTS - Premium 2026
   ============================================ */
.liquid-gradient {
  position: relative;
  overflow: hidden;
}

.liquid-gradient::before,
.liquid-gradient::after {
  content: '';
  position: absolute;
  inset: -50%;
  background: conic-gradient(
    from var(--angle, 0deg),
    var(--color-primary-500) 0deg,
    var(--color-accent-500) 120deg,
    var(--color-success-500) 240deg,
    var(--color-primary-500) 360deg
  );
  animation: liquidRotate 15s linear infinite;
  filter: blur(80px);
  opacity: 0.4;
}

.liquid-gradient::after {
  animation-delay: -7.5s;
  animation-direction: reverse;
  filter: blur(100px);
  opacity: 0.25;
}

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

/* Blob morphing animation */
.liquid-blob {
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  animation: blobMorph 8s ease-in-out infinite,
             blobFloat 6s ease-in-out infinite;
}

@keyframes blobMorph {
  0%, 100% {
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  }
  25% {
    border-radius: 58% 42% 75% 25% / 76% 46% 54% 24%;
  }
  50% {
    border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%;
  }
  75% {
    border-radius: 33% 67% 58% 42% / 63% 68% 32% 37%;
  }
}

@keyframes blobFloat {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(20px, -15px) scale(1.03);
  }
  66% {
    transform: translate(-15px, 10px) scale(0.97);
  }
}

/* ============================================
   SCROLL-LINKED ANIMATIONS (CSS 2026)
   ============================================ */
@supports (animation-timeline: scroll()) {
  .scroll-reveal {
    animation: scrollFadeIn linear;
    animation-timeline: view();
    animation-range: entry 0% cover 30%;
  }

  @keyframes scrollFadeIn {
    from {
      opacity: 0;
      transform: translateY(40px) scale(0.95);
      filter: blur(4px);
    }
    to {
      opacity: 1;
      transform: translateY(0) scale(1);
      filter: blur(0);
    }
  }

  /* Scroll progress indicator */
  .scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform-origin: left;
    animation: scrollProgress linear;
    animation-timeline: scroll(root);
    z-index: var(--z-fixed);
  }

  @keyframes scrollProgress {
    from {
      transform: scaleX(0);
    }
    to {
      transform: scaleX(1);
    }
  }
}

/* ============================================
   SPRING-BASED STAGGER REVEALS
   ============================================ */
[data-stagger] {
  --stagger-delay: 80ms;
}

[data-stagger] > * {
  opacity: 0;
  transform: translateY(30px) scale(0.95);
}

[data-stagger].visible > * {
  opacity: 1;
  transform: translateY(0) scale(1);
  transition:
    opacity var(--duration-medium, 400ms) var(--spring-smooth, cubic-bezier(0.22, 0.61, 0.36, 1)),
    transform var(--duration-large, 600ms) var(--spring-bounce-1, cubic-bezier(0.34, 1.56, 0.64, 1));
}

[data-stagger].visible > *:nth-child(1) { transition-delay: calc(var(--stagger-delay) * 0); }
[data-stagger].visible > *:nth-child(2) { transition-delay: calc(var(--stagger-delay) * 1); }
[data-stagger].visible > *:nth-child(3) { transition-delay: calc(var(--stagger-delay) * 2); }
[data-stagger].visible > *:nth-child(4) { transition-delay: calc(var(--stagger-delay) * 3); }
[data-stagger].visible > *:nth-child(5) { transition-delay: calc(var(--stagger-delay) * 4); }
[data-stagger].visible > *:nth-child(6) { transition-delay: calc(var(--stagger-delay) * 5); }
[data-stagger].visible > *:nth-child(7) { transition-delay: calc(var(--stagger-delay) * 6); }
[data-stagger].visible > *:nth-child(8) { transition-delay: calc(var(--stagger-delay) * 7); }

/* ============================================
   HAPTIC BUTTON FEEDBACK
   ============================================ */
.btn-haptic {
  transition: transform var(--duration-micro, 150ms) var(--spring-snappy, cubic-bezier(0.17, 0.89, 0.32, 1.28));
}

.btn-haptic:active {
  transform: scale(0.97);
}

/* ============================================
   PREMIUM HOVER SHADOW TRANSITIONS
   ============================================ */
.hover-lift {
  transition:
    transform var(--duration-small, 250ms) var(--spring-bounce-1, cubic-bezier(0.34, 1.56, 0.64, 1)),
    box-shadow var(--duration-small, 250ms) ease;
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow:
    0 10px 40px -10px rgba(6, 182, 212, 0.3),
    0 0 0 1px rgba(6, 182, 212, 0.1);
}

.dark .hover-lift:hover {
  box-shadow:
    0 10px 40px -10px rgba(34, 211, 238, 0.4),
    0 0 0 1px rgba(34, 211, 238, 0.15);
}

/* GPU-composited shadow hover (no paint) */
.hover-shadow-gpu {
  position: relative;
}

.hover-shadow-gpu::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 20px 50px -10px rgba(6, 182, 212, 0.35);
  opacity: 0;
  transition: opacity var(--duration-small, 250ms) ease;
  pointer-events: none;
  z-index: -1;
}

.hover-shadow-gpu:hover::after {
  opacity: 1;
}

/* ============================================
   CONTAIN PROPERTY FOR PERFORMANCE
   ============================================ */
.contain-layout {
  contain: layout;
}

.contain-paint {
  contain: paint;
}

.contain-strict {
  contain: layout style paint;
}