/* ==========================================================================
   MEHTA ASSOCIATES - ANIMATIONS & TRANSITIONS
   Loading Screen | Scroll Reveals | Micro-interactions | Accessibility
   ========================================================================== */

/* Preloader Animation */
.site-preloader {
  position: fixed;
  inset: 0;
  background-color: #FFFFFF;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.4s ease-out, visibility 0.4s ease-out;
}

.site-preloader.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.preloader-mark {
  width: 56px;
  height: 56px;
  border-radius: 8px;
  background-color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: pulseScale 1.8s ease-in-out infinite;
}

.preloader-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.preloader-progress-bar {
  width: 140px;
  height: 3px;
  background-color: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
  margin-top: 0.5rem;
}

.preloader-progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 40%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  border-radius: 2px;
  animation: preloaderTrack 1.2s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

@keyframes pulseScale {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(200, 16, 46, 0.25);
  }
  50% {
    transform: scale(1.04);
    box-shadow: 0 0 0 10px rgba(200, 16, 46, 0);
  }
}

@keyframes preloaderTrack {
  0% {
    left: -40%;
  }
  100% {
    left: 100%;
  }
}

/* Scroll Reveal Classes (Driven by IntersectionObserver) */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger Delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* Subtle pulse for milestone badges */
.pulse-subtle {
  animation: pulseSubtle 3s ease-in-out infinite;
}

@keyframes pulseSubtle {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.85;
  }
}

/* Spinner for form submission */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #FFFFFF;
  animation: spin 0.75s linear infinite;
  vertical-align: middle;
}

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

/* Accessible 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;
  }

  .site-preloader {
    display: none !important;
  }

  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}