/* Shared floating brand mark — logo only, no chrome */
.site-header {
  position: fixed;
  top: 28px;
  left: 28px;
  z-index: 100;
  background: transparent;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 0.4s ease,
    transform 0.4s ease,
    visibility 0.4s ease;
}

.site-header.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

a.site-logo {
  display: block;
  line-height: 0;
  text-decoration: none;
  color: inherit;
  opacity: 1;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.site-header.is-visible a.site-logo {
  pointer-events: auto;
}

.site-header.is-visible a.site-logo:hover {
  opacity: 0.78;
  transform: scale(1.03);
  text-decoration: none;
}

.site-header.is-visible a.site-logo:focus-visible {
  outline: none;
  opacity: 0.9;
  transform: scale(1.03);
}

.site-logo img {
  display: block;
  width: 52px;
  height: auto;
}

@media (max-width: 560px) {
  .site-header {
    top: 20px;
    left: 20px;
  }

  .site-logo img {
    width: 44px;
  }
}