.prototype-home-link {
  position: fixed;
  z-index: 10000;
  top: max(12px, env(safe-area-inset-top));
  left: max(14px, env(safe-area-inset-left));
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 7px;
  padding: 0 13px;
  border: 1px solid rgba(37, 49, 40, 0.14);
  border-radius: 999px;
  color: #263229;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 10px 28px rgba(31, 43, 34, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 12px;
  font-weight: 850;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.prototype-home-link:hover {
  transform: translateY(-1px);
  background: #fff;
  box-shadow: 0 13px 34px rgba(31, 43, 34, 0.16);
}

.prototype-home-link:focus-visible {
  outline: 3px solid rgba(23, 96, 68, 0.34);
  outline-offset: 3px;
}

body {
  padding-top: calc(54px + env(safe-area-inset-top)) !important;
}

@media (max-width: 560px) {
  .prototype-home-link {
    top: max(8px, env(safe-area-inset-top));
    left: max(9px, env(safe-area-inset-left));
    min-height: 36px;
    padding: 0 12px;
    font-size: 11px;
  }

  body {
    padding-top: calc(48px + env(safe-area-inset-top)) !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .prototype-home-link { transition: none; }
}

@media print {
  .prototype-home-link { display: none; }
  body { padding-top: 0 !important; }
}