/* 3D logo flip — header (from TCS Logo Animation demo) */
.tcs-logo-stage-nav {
  display: inline-flex;
  align-items: center;
  perspective: 1500px;
  perspective-origin: 50% 50%;
}

.tcs-logo {
  display: inline-block;
  transform-style: preserve-3d;
  transform-origin: 50% 50%;
  will-change: transform;
  position: relative;
  transform: rotateY(0deg) rotateX(0deg);
  line-height: 0;
  cursor: pointer;
}

.tcs-logo img {
  display: block;
  height: 100%;
  width: auto;
  backface-visibility: visible;
}

.tcs-logo::before {
  content: '';
  position: absolute;
  inset: -8% -4%;
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(255, 255, 255, 0) 45%,
    rgba(255, 255, 255, 0.55) 50%,
    rgba(255, 255, 255, 0) 55%,
    transparent 70%
  );
  mix-blend-mode: screen;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-30%);
  border-radius: 6px;
}

.tcs-logo.is-rotating::before {
  animation: tcs-logo-shine 3.2s ease-out;
}

@keyframes tcs-logo-shine {
  0% { opacity: 0; transform: translateX(-30%); }
  35% { opacity: 0.8; }
  100% { opacity: 0; transform: translateX(30%); }
}

@media (prefers-reduced-motion: reduce) {
  .tcs-logo.is-rotating::before {
    animation: none;
  }
}