/* ============================================
   Smooth Animations & Keyframes (2026 Best Practices)
   ============================================ */

/* Custom Easing Functions - Inspired by Cal AI */
:root {
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out-cubic: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Fade In Up Animation - Smoother */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Scale In Animation - Subtle */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Floating Animation - Very Subtle */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* Gentle Glow */
@keyframes gentleGlow {
  0%, 100% {
    box-shadow: 0 0 0 rgba(0, 204, 255, 0);
  }
  50% {
    box-shadow: 0 0 20px rgba(0, 204, 255, 0.15);
  }
}

/* ============================================
   Applied Animations
   ============================================ */

/* Hero Image - No animation */
.hero__image {
  /* Float animation removed */
}

/* Scroll-triggered Animations - Slower, Smoother Entrance */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 1.2s var(--ease-out-expo),
              transform 1.2s var(--ease-out-expo);
}

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

/* Staggered Animation Delays - More Gradual */
.feature-card:nth-child(1).visible {
  transition-delay: 0.1s;
}

.feature-card:nth-child(2).visible {
  transition-delay: 0.2s;
}

.feature-card:nth-child(3).visible {
  transition-delay: 0.3s;
}

.feature-card:nth-child(4).visible {
  transition-delay: 0.4s;
}

.step:nth-child(1).visible {
  transition-delay: 0.15s;
}

.step:nth-child(2).visible {
  transition-delay: 0.25s;
}

.step:nth-child(3).visible {
  transition-delay: 0.35s;
}

.showcase__item:nth-child(1).visible {
  transition-delay: 0.08s;
}

.showcase__item:nth-child(2).visible {
  transition-delay: 0.16s;
}

.showcase__item:nth-child(3).visible {
  transition-delay: 0.24s;
}

/* ============================================
   Smooth Hover Transitions
   ============================================ */

/* Card Hover Effect - Buttery Smooth */
.feature-card {
  transition: transform 0.4s var(--ease-out-expo),
              box-shadow 0.4s var(--ease-out-expo),
              border-color 0.4s var(--ease-out-expo),
              background 0.4s var(--ease-out-expo);
  will-change: transform;
}

.feature-card:hover {
  transform: translateY(-3px) scale(1.01);
}

/* Showcase Item Hover - Smooth */
.showcase__item {
  transition: transform 0.5s var(--ease-out-expo),
              box-shadow 0.5s var(--ease-out-expo),
              border-color 0.5s var(--ease-out-expo);
  will-change: transform;
}

.showcase__item:hover {
  transform: translateY(-6px) scale(1.02);
}

/* Button Hover - Snappy but Smooth */
.btn {
  transition: transform 0.25s var(--ease-out-expo),
              box-shadow 0.25s var(--ease-out-expo),
              background 0.25s var(--ease-out-expo);
  will-change: transform;
}

.btn--primary:hover {
  transform: translateY(-1px) scale(1.02);
}

/* Link Hover Effect - Fast */
a {
  transition: color 0.2s var(--ease-smooth),
              opacity 0.2s var(--ease-smooth);
}

/* Image Hover Scale - Smooth and Gradual */
.showcase__item img,
.step__image img {
  transition: transform 0.6s var(--ease-out-expo);
  will-change: transform;
}

.showcase__item:hover img {
  transform: scale(1.03);
}

.step__image {
  transition: transform 0.4s var(--ease-out-expo),
              box-shadow 0.4s var(--ease-out-expo),
              border-color 0.4s var(--ease-out-expo);
}

.step__image:hover {
  transform: translateY(-2px);
}

/* Navigation Scroll - Smooth */
.nav {
  transition: background-color 0.4s var(--ease-smooth),
              backdrop-filter 0.4s var(--ease-smooth),
              border-bottom 0.4s var(--ease-smooth);
}

/* ============================================
   Micro-interactions
   ============================================ */

/* Icon Subtle Animation on Hover */
.feature-card__icon {
  transition: transform 0.3s var(--ease-out-expo);
}

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

/* CTA Glow on Hover - Very Subtle */
.hero__cta .btn--primary {
  transition: transform 0.3s var(--ease-out-expo),
              box-shadow 0.3s var(--ease-out-expo);
}

.hero__cta .btn--primary:hover {
  animation: gentleGlow 2s var(--ease-smooth) infinite;
}

/* ============================================
   Performance Optimizations
   ============================================ */

/* GPU Acceleration for Smooth Animations */
.hero__image,
.feature-card,
.showcase__item,
.btn {
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* ============================================
   Reduced Motion Support
   ============================================ */

@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;
  }

  .hero__image {
    animation: none;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .feature-card:hover,
  .showcase__item:hover,
  .btn:hover {
    transform: none;
  }
}

/* ============================================
   Loading State
   ============================================ */

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.loading-shimmer {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.03) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  background-size: 1000px 100%;
  animation: shimmer 2.5s var(--ease-smooth) infinite;
}

/* ============================================
   Focus States - Smooth
   ============================================ */

*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  transition: outline-offset 0.2s var(--ease-smooth);
}

*:focus-visible:active {
  outline-offset: 1px;
}