/* Nox's silver motion layer sits above section backgrounds, below content. */
body { isolation: isolate; }
.night-serpent {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: .46;
  pointer-events: none;
}
.hero-art, .hero-side, .hero-bottom { z-index: 2; }
.hero-frame { z-index: 3; }
.genre-strip > *, .about > *, .work > *, .boundaries-inner,
.contact > *, .closing > *, .site-footer { position: relative; z-index: 2; }
.boundary-art { position: relative; }

/* A narrow conic highlight travels around the metal, never over the image. */
@property --metal-angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}
.hero-frame, .portrait, .boundary-art {
  border-color: #9cabb65c;
  box-shadow: 0 0 0 1px #e5edf00c, inset 0 0 0 1px #d5e1e70a;
}
.boundary-art { box-shadow: 0 20px 60px #0007, 0 0 0 1px #e5edf012; }
.frame-glint {
  position: absolute;
  inset: -1px;
  padding: 2px;
  border-radius: inherit;
  pointer-events: none;
  z-index: 4;
  background: conic-gradient(from var(--metal-angle),
    transparent 0deg 18deg, #9aafbd44 35deg, #f5faff 46deg,
    #b9cbd86b 53deg, transparent 70deg 196deg,
    #d2e1ec80 218deg, transparent 240deg 360deg);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  animation: silver-orbit 12s linear infinite;
}
.portrait .frame-glint { animation-delay: -4s; animation-duration: 15s; }
.boundary-art .frame-glint { animation-delay: -8s; animation-duration: 17s; }
@keyframes silver-orbit { to { --metal-angle: 360deg; } }

.hero-frame::before, .hero-frame::after, .portrait-corner {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  line-height: 1;
  transform-origin: center;
  text-shadow: 0 0 9px #d3e5f03b;
  animation: star-turn 24s linear infinite;
  z-index: 5;
}
.hero-frame::before { left: -16px; bottom: -16px; }
.hero-frame::after { right: -16px; bottom: -16px; animation-direction: reverse; }
.portrait-corner.top { right: -21px; animation-duration: 30s; }
.portrait-corner.bottom { left: -21px; animation-direction: reverse; animation-delay: -8s; }
@keyframes star-turn { to { transform: rotate(360deg); } }

.motion-toggle {
  min-height: 44px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  background: #1c252d;
  color: var(--silver);
  font-size: 10px;
  letter-spacing: .06em;
}
.motion-toggle:hover { border-color: var(--silver); }
.footer-bottom { align-items: center; }
.motion-paused .frame-glint, .motion-paused .portrait-corner,
.motion-paused .hero-frame::before, .motion-paused .hero-frame::after {
  animation-play-state: paused;
}
@media (max-width: 600px) {
  .night-serpent { opacity: .32; }
  .motion-toggle { margin-left: auto; }
}
@media (prefers-reduced-motion: reduce) {
  .night-serpent, .motion-toggle { display: none; }
  .frame-glint { --metal-angle: 46deg; }
}