/* Home hero background: the Hubble eXtreme Deep Field at the top,
   fading into night blue behind the spectrum. Image: NASA/ESA, public domain. */
.hero {
  background-image:
    linear-gradient(180deg,
      rgba(10, 19, 32, 0.18) 0%,
      rgba(10, 19, 32, 0.55) 30%,
      rgba(15, 27, 43, 0.92) 58%,
      #0F1B2B 72%,
      #13233A 100%),
    url("../images/hero-xdf.jpg");
  background-size: cover, cover;
  background-position: center top, center top;
  background-repeat: no-repeat;
}
.hero-title, .hero-sub { text-shadow: 0 1px 18px rgba(5, 10, 18, 0.65); }
.hero-credit {
  position: absolute; z-index: 2; right: 1rem; bottom: .45rem; margin: 0;
  font: 11px "IBM Plex Mono", ui-monospace, monospace; color: #8EA8C6; opacity: .8;
}
.hero .spectrum-bg { bottom: 1.7rem; }
@media (max-width: 760px) {
  .hero-credit { left: 1.2rem; right: auto; font-size: 10px; }
}