/* Prevent layout shift while preloader is active */
html.is-loading {
  overflow: hidden;
}

#preloader {
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
#preloader.hide {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

@keyframes fillbox {
  0%   { height: 0%; }
  50%  { height: 100%; }
  100% { height: 0%; }
}
.animate-fillbox {
  animation: fillbox 1.6s ease-in-out infinite;
}

/* Header background transition on scroll (home page starts transparent) */
#site-header.scrolled {
  background-color: var(--navy, #0B1E3A);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* Glassmorphism utility */
.glass {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

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

/* Gallery lightbox display state */
#lightbox.flex {
  display: flex;
}

/* Toast animation */
#toast.show {
  animation: toastIn 0.3s ease forwards;
}
@keyframes toastIn {
  from { transform: translateY(20px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* ============================================================
   Container drop/stack (home page) — GSAP sets the transform,
   this just defines the visual shape of each "container".
   ============================================================ */
#container-stack {
  perspective: 1000px;
}
.container-drop {
  opacity: 0;
  will-change: transform, opacity;
}
.container-box {
  height: 88px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: 'Sora', sans-serif;
  font-weight: 700;
  letter-spacing: 0.15em;
  font-size: 0.8rem;
  box-shadow: 0 12px 24px rgba(11, 30, 58, 0.25);
  background-image:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.08) 0 2px, transparent 2px 26px);
}

/* ============================================================
   Road connectivity — trailer driving across the route line
   ============================================================ */
.trailer-track {
  position: relative;
  overflow: hidden;
}
.trailer-icon {
  animation: trailerDrive 5s linear infinite;
}
@keyframes trailerDrive {
  0%   { transform: translateX(-10%); }
  50%  { transform: translateX(10%); }
  100% { transform: translateX(-10%); }
}

/* ============================================================
   Rail connectivity — train moving along the connection lines
   ============================================================ */
.rail-track {
  position: relative;
}
.train-icon {
  animation: trainMove 4s ease-in-out infinite;
}
@keyframes trainMove {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
.rail-pulse {
  animation: railPulse 2.2s ease-in-out infinite;
}
@keyframes railPulse {
  0%, 100% { opacity: 0.3; }
  50%      { opacity: 1; }
}

/* Infrastructure — subtle crane sway on icon */
.crane-sway {
  animation: craneSway 3.5s ease-in-out infinite;
  transform-origin: top center;
}
@keyframes craneSway {
  0%, 100% { transform: rotate(-3deg); }
  50%      { transform: rotate(3deg); }
}