/* ==========================================================================
   THE AVIATION MIND — HIGH PERFORMANCE MOTION & ANIMATION SYSTEM
   Reverse-Engineered from BIA Patna Interaction Audit
   ========================================================================== */

:root {
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-micro: 180ms;
  --duration-medium: 300ms;
  --duration-entrance: 550ms;
  --stagger-step: 90ms;
}

/* Scroll Entrance Classes */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-entrance) var(--ease-spring),
              transform var(--duration-entrance) var(--ease-spring);
  will-change: opacity, transform;
}

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

.reveal-fade-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity var(--duration-entrance) var(--ease-spring),
              transform var(--duration-entrance) var(--ease-spring);
}

.reveal-fade-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity var(--duration-entrance) var(--ease-spring),
              transform var(--duration-entrance) var(--ease-spring);
}

.reveal-fade-left.is-revealed,
.reveal-fade-right.is-revealed {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger Offsets */
.reveal-stagger-1 { transition-delay: 80ms; }
.reveal-stagger-2 { transition-delay: 160ms; }
.reveal-stagger-3 { transition-delay: 240ms; }
.reveal-stagger-4 { transition-delay: 320ms; }
.reveal-stagger-5 { transition-delay: 400ms; }
.reveal-stagger-6 { transition-delay: 480ms; }

/* Interactive Card Elevations */
.aviation-card {
  transition: transform var(--duration-medium) var(--ease-spring),
              box-shadow var(--duration-medium) var(--ease-spring),
              border-color var(--duration-micro) ease;
}

.aviation-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 32px -8px rgba(6, 29, 59, 0.15) !important;
}

.aviation-card .card-thumb-wrap {
  overflow: hidden;
}

.aviation-card .card-thumb-wrap img {
  transition: transform 450ms var(--ease-smooth);
}

.aviation-card:hover .card-thumb-wrap img {
  transform: scale(1.05);
}

/* Button & Nav Interactions */
.btn-aviation-primary {
  transition: background-color var(--duration-micro) ease,
              border-color var(--duration-micro) ease,
              transform var(--duration-micro) var(--ease-spring),
              box-shadow var(--duration-micro) var(--ease-spring);
}

.btn-aviation-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px -4px rgba(7, 91, 203, 0.35);
}

.nav-link-animated {
  position: relative;
  display: inline-block;
}

.nav-link-animated::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #38BDF8, #0066FF);
  border-radius: 2px;
  transition: width var(--duration-micro) ease, left var(--duration-micro) ease;
}

.nav-link-animated:hover::after,
.nav-link-animated.active::after {
  width: 100%;
  left: 0;
}

/* Off-canvas mobile menu animation */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  max-width: 85vw;
  height: 100vh;
  background: var(--color-deep-navy, #03172F);
  z-index: 1050;
  transition: right 300ms var(--ease-spring), visibility 300ms;
  box-shadow: -8px 0 24px rgba(0, 0, 0, 0.3);
  overflow-y: auto;
  visibility: hidden;
  pointer-events: none;
}

.mobile-drawer.is-open {
  right: 0;
  visibility: visible;
  pointer-events: auto;
}

.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(6, 29, 59, 0.65);
  backdrop-filter: blur(4px);
  z-index: 1040;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.drawer-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* Accordion Smooth Transitions */
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 320ms var(--ease-spring);
}

.accordion-body.is-open {
  /* Dynamic maxHeight set by JS; fallback */
  max-height: 600px;
}

/* Accessibility: prefers-reduced-motion */
@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;
  }
  .reveal-on-scroll,
  .reveal-fade-left,
  .reveal-fade-right {
    opacity: 1 !important;
    transform: none !important;
  }
  .aviation-card:hover {
    transform: none !important;
  }
}


/* Mobile Hero Reveal Optimization - Immediate Visibility Without Horizontal Shift */
@media (max-width: 850px) {
  .hero-media-wrap.reveal-fade-right,
  .courses-hero-visual-wrap.reveal-fade-right,
  .about-hero-visual.reveal-fade-right {
    opacity: 1 !important;
    transform: none !important;
  }
}