/**
 * Scroll Reveal Animation System
 * 
 * Modern, performant scroll-triggered animations using CSS classes
 * and Intersection Observer API for optimal performance.
 * 
 * Features:
 * - GPU-accelerated transforms
 * - Reduced motion support
 * - Staggered animations
 * - Mobile-optimized
 */

/* ==========================================================================
   BASE REVEAL STYLES
   ========================================================================== */

.reveal-item {
  opacity: 0;
  transition: opacity 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.65s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  backface-visibility: hidden;
  transform: translateZ(0);
  /* will-change added via JS when animation starts, removed when complete */
}

.reveal-item.animating {
  will-change: opacity, transform;
}

.reveal-item.revealed {
  opacity: 1;
}

/* ==========================================================================
   REVEAL DIRECTIONS - Slide up from below (primary), not pop from nowhere
   ========================================================================== */

/* Slide Up - element starts below, animates up into place (dominant effect) */
.reveal-item--up {
  transform: translateY(90px) translateZ(0);
}

.reveal-item--up.revealed {
  transform: translateY(0) translateZ(0);
}

/* Slide Down - element starts above, animates down */
.reveal-item--down {
  transform: translateY(-90px) translateZ(0);
}

.reveal-item--down.revealed {
  transform: translateY(0) translateZ(0);
}

/* Slide Left */
.reveal-item--left {
  transform: translateX(-60px) translateZ(0);
}

.reveal-item--left.revealed {
  transform: translateX(0) translateZ(0);
}

/* Slide Right */
.reveal-item--right {
  transform: translateX(60px) translateZ(0);
}

.reveal-item--right.revealed {
  transform: translateX(0) translateZ(0);
}

/* Scale In - subtle scale with slight slide up */
.reveal-item--scale {
  transform: translateY(50px) scale(0.92) translateZ(0);
}

.reveal-item--scale.revealed {
  transform: translateY(0) scale(1) translateZ(0);
}

/* Fade - now also slides up subtly (no more pure fade-from-nowhere) */
.reveal-item--fade {
  transform: translateY(50px) translateZ(0);
}

.reveal-item--fade.revealed {
  transform: translateY(0) translateZ(0);
}

/* ==========================================================================
   STAGGER DELAYS
   ========================================================================== */

.reveal-item--delay-1 {
  transition-delay: 0.1s;
}

.reveal-item--delay-2 {
  transition-delay: 0.2s;
}

.reveal-item--delay-3 {
  transition-delay: 0.3s;
}

.reveal-item--delay-4 {
  transition-delay: 0.4s;
}

.reveal-item--delay-5 {
  transition-delay: 0.5s;
}

.reveal-item--delay-6 {
  transition-delay: 0.6s;
}

/* Extended delays for featured properties on mobile */
@media (max-width: 768px) {
  .featured-properties-grid .reveal-item--delay-1 {
    transition-delay: 0.15s;
  }
  
  .featured-properties-grid .reveal-item--delay-2 {
    transition-delay: 0.3s;
  }
  
  .featured-properties-grid .reveal-item--delay-3 {
    transition-delay: 0.45s;
  }
  
  .featured-properties-grid .reveal-item--delay-4 {
    transition-delay: 0.6s;
  }
  
  .featured-properties-grid .reveal-item--delay-5 {
    transition-delay: 0.75s;
  }
  
  .featured-properties-grid .reveal-item--delay-6 {
    transition-delay: 0.9s;
  }
}

/* ==========================================================================
   MOBILE OPTIMIZATIONS
   ========================================================================== */

@media (max-width: 768px) {
  .reveal-item--up {
    transform: translateY(70px) translateZ(0);
  }
  .reveal-item--up.revealed {
    transform: translateY(0) translateZ(0);
  }
  
  .reveal-item--down {
    transform: translateY(-70px) translateZ(0);
  }
  .reveal-item--down.revealed {
    transform: translateY(0) translateZ(0);
  }
  
  .reveal-item--left,
  .reveal-item--right {
    transform: translateX(40px) translateZ(0);
  }
  .reveal-item--left.revealed,
  .reveal-item--right.revealed {
    transform: translateX(0) translateZ(0);
  }
  
  .reveal-item--scale {
    transform: translateY(40px) scale(0.94) translateZ(0);
  }
  .reveal-item--scale.revealed {
    transform: translateY(0) scale(1) translateZ(0);
  }
  
  .reveal-item--fade {
    transform: translateY(40px) translateZ(0);
  }
  .reveal-item--fade.revealed {
    transform: translateY(0) translateZ(0);
  }
  
  /* Slightly faster on mobile for fluid feel */
  .reveal-item {
    transition-duration: 0.45s;
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  }
  
  /* Disable animations when tab is hidden (handled via JS) */
  body.tab-hidden .reveal-item {
    transition: none !important;
  }
  
  /* Featured property cards: slide up from below */
  .featured-property-card-overlay.reveal-item--up {
    transform: translateY(60px) translateZ(0);
  }
  
  .featured-property-card-overlay.reveal-item--up.revealed {
    transform: translateY(0) translateZ(0);
  }
}

/* ==========================================================================
   REDUCED MOTION SUPPORT
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .reveal-item {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  
  .reveal-item.revealed {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS
   ========================================================================== */

.reveal-item {
  /* GPU acceleration */
  transform: translateZ(0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Remove will-change after animation completes */
.reveal-item.revealed {
  will-change: auto;
}