body {
  margin: 0; background: #ffffff; color: #192c38;
  font-family: Arial, Helvetica, sans-serif;
}
main {
  box-sizing: border-box; height: 100vh; height: 100svh;
  padding: 64px 24px; display: grid; place-items: center;
}
main img {
  display: block; width: 100%; height: 100%; min-height: 0;
  object-fit: contain;
}
.back {
  position: fixed; z-index: 1;
  top: max(16px, env(safe-area-inset-top)); left: max(20px, env(safe-area-inset-left));
  display: inline-flex; gap: 8px; align-items: center; min-height: 44px;
  box-sizing: border-box; padding: 8px 14px; border: 1px solid #dce3e7;
  border-radius: 8px; background: #ffffff; color: #245c83;
  font-size: 16px; text-decoration: none;
}
.back:hover { background: #e8f0f7; }
.back:focus-visible { outline: 2px solid #245c83; outline-offset: 3px; }
@media (max-width: 600px) { main { padding-inline: 8px; } }