/* ==========================================
   3D EFFECTS & TRANSFORMS
   ========================================== */

/* ---- Card 3D Base ---- */
.card-3d {
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.card-3d:hover {
  transform: translateY(-8px) rotateX(2deg) rotateY(-1deg) translateZ(20px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.15),
              0 8px 20px rgba(0,0,0,0.1);
}
.card-3d::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg,
    rgba(255,255,255,0.2) 0%,
    rgba(255,255,255,0) 50%,
    rgba(255,255,255,0) 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 1;
}
.card-3d:hover::before { opacity: 1; }

/* ---- 3D Tilt Effect ---- */
.tilt-3d {
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out;
}

/* ---- 3D Perspective Container ---- */
.perspective-container {
  perspective: 1200px;
  transform-style: preserve-3d;
}

/* ---- 3D Text Pop-out ---- */
.text-3d {
  transform: translateZ(0);
  transition: transform 0.3s ease;
}
.text-3d:hover {
  transform: translateZ(30px) scale(1.05);
}

/* ---- 3D Flip Card ---- */
.flip-card {
  perspective: 800px;
}
.flip-card-inner {
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
}
.flip-card-front, .flip-card-back {
  backface-visibility: hidden;
  position: absolute; inset: 0;
}
.flip-card-back {
  transform: rotateY(180deg);
}

/* ---- 3D Nav Logo ---- */
.nav-logo-3d {
  transform-style: preserve-3d;
  transition: transform 0.3s ease;
}
.nav-logo-3d:hover {
  transform: perspective(500px) rotateY(15deg) rotateX(-5deg) scale(1.08);
}

/* ---- 3D Button ---- */
.btn-3d {
  transform-style: preserve-3d;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-3d:hover {
  transform: perspective(500px) rotateX(-8deg) translateY(-4px) translateZ(10px);
}
.btn-3d:active {
  transform: perspective(500px) rotateX(-2deg) translateY(-1px) translateZ(3px);
}

/* ---- Depth Shadows ---- */
.depth-shadow {
  box-shadow: 0 2px 4px rgba(0,0,0,0.05),
              0 4px 8px rgba(0,0,0,0.05),
              0 8px 16px rgba(0,0,0,0.05),
              0 16px 32px rgba(0,0,0,0.05);
  transition: box-shadow 0.4s ease;
}
.depth-shadow:hover {
  box-shadow: 0 4px 8px rgba(0,0,0,0.08),
              0 8px 16px rgba(0,0,0,0.08),
              0 16px 32px rgba(0,0,0,0.08),
              0 32px 64px rgba(0,0,0,0.08);
}

/* ---- Hero 3D Layers ---- */
.hero-3d-layer {
  transform-style: preserve-3d;
  transition: transform 0.1s ease-out;
}

/* ---- Gallery 3D Tilt ---- */
.gallery-item {
  transform-style: preserve-3d;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.gallery-item:hover {
  transform: perspective(800px) rotateY(-5deg) rotateX(3deg) scale(1.03);
  box-shadow: 15px 15px 40px rgba(0,0,0,0.2);
}

/* ---- 3D Rotate on Click ---- */
.rotate-3d-click {
  transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.rotate-3d-click.clicked {
  transform: rotateY(360deg);
}

/* ---- Parallax Layers ---- */
.parallax-layer {
  transition: transform 0.15s ease-out;
  will-change: transform;
}

/* ---- 3D Border Gradient ---- */
.border-3d {
  position: relative;
}
.border-3d::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(45deg,
    var(--primary), var(--secondary), var(--accent), var(--yellow));
  background-size: 300% 300%;
  animation: borderGradient 4s ease infinite;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.border-3d:hover::after { opacity: 1; }
@keyframes borderGradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ---- Confetti Piece ---- */
.confetti-piece {
  position: absolute;
  width: 10px; height: 10px;
  top: -10px;
  opacity: 0;
}
.confetti-piece.active {
  animation: confettiFall var(--fall-duration, 3s) ease forwards;
  animation-delay: var(--fall-delay, 0s);
}