/* Homepage hero solar system (v4): true-3D technique inspired by Julian
   Garnier's "CSS 3D Solar System" (CodePen krNqZO) — system plane tilted
   rotateX(75deg), orbit ring carries Earth via a counter-rotating positioner
   so it stays upright, real 3D occlusion in front of / behind the sun.
   Sun + single Earth only. Pure CSS. Honors prefers-reduced-motion. */

.av-orbit {
  position: relative;
  width: min(100%, 540px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

/* starfield, two parallax layers */
.av-orbit__stars,
.av-orbit__stars::after {
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
}
.av-orbit__stars {
  background-image:
    radial-gradient(1.5px 1.5px at 12% 22%, #fff, transparent),
    radial-gradient(1px 1px at 28% 8%, #fff, transparent),
    radial-gradient(2px 2px at 44% 16%, #cfe6ff, transparent),
    radial-gradient(1px 1px at 63% 7%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 78% 20%, #fff, transparent),
    radial-gradient(1px 1px at 90% 42%, #cfe6ff, transparent),
    radial-gradient(2px 2px at 8% 58%, #fff, transparent),
    radial-gradient(1px 1px at 20% 82%, #fff, transparent),
    radial-gradient(1px 1px at 58% 88%, #fff, transparent),
    radial-gradient(1px 1px at 88% 66%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 94% 10%, #fff, transparent);
  animation: av-twinkle 3.2s ease-in-out infinite alternate;
}
.av-orbit__stars::after {
  content: "";
  background-image:
    radial-gradient(1px 1px at 18% 45%, #ffe9c4, transparent),
    radial-gradient(2px 2px at 36% 66%, #fff, transparent),
    radial-gradient(1px 1px at 52% 30%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 70% 55%, #cfe6ff, transparent),
    radial-gradient(1px 1px at 84% 84%, #fff, transparent),
    radial-gradient(2px 2px at 6% 12%, #fff, transparent),
    radial-gradient(1px 1px at 96% 55%, #ffe9c4, transparent);
  animation: av-twinkle 4.7s ease-in-out infinite alternate-reverse;
}

/* tilted system plane */
.av-orbit__system {
  position: absolute;
  inset: 0;
  transform: rotateX(75deg);
  transform-style: preserve-3d;
}

/* sun, billboarded to face the viewer */
.av-orbit__sun {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 27%;
  aspect-ratio: 1 / 1;
  margin: -13.5% 0 0 -13.5%;
  border-radius: 50%;
  background-color: #fb7209;
  background-image: radial-gradient(circle at 38% 35%,
    #fffdf0 0%, #ffe98a 30%, #ffc93c 55%, #ff9500 78%, #d94f00 100%);
  background-repeat: no-repeat;
  box-shadow:
    0 0 24px 6px rgba(255, 180, 60, .55),
    0 0 70px 24px rgba(255, 130, 30, .28),
    0 0 140px 60px rgba(255, 110, 20, .12);
  transform: rotateX(-90deg);
  animation: av-pulse 5s ease-in-out infinite;
}

/* rotating corona rays around the sun (outer, slow, whisper-fine) */
.av-orbit__sun::before {
  content: "";
  position: absolute;
  inset: -42%;
  border-radius: 50%;
  background: repeating-conic-gradient(from 0deg,
    rgba(255, 200, 100, .09) 0deg 1deg, transparent 1deg 9deg);
  -webkit-mask: radial-gradient(circle, transparent 30%, #000 36%, #000 58%, transparent 72%);
  mask: radial-gradient(circle, transparent 30%, #000 36%, #000 58%, transparent 72%);
  animation: av-spin 60s linear infinite;
}

/* inner corona shimmer (counter-rotating, offset) */
.av-orbit__sun::after {
  content: "";
  position: absolute;
  inset: -24%;
  border-radius: 50%;
  background: repeating-conic-gradient(from 4deg,
    rgba(255, 230, 160, .1) 0deg 1deg, transparent 1deg 7deg);
  -webkit-mask: radial-gradient(circle, transparent 40%, #000 45%, #000 64%, transparent 78%);
  mask: radial-gradient(circle, transparent 40%, #000 45%, #000 64%, transparent 78%);
  animation: av-spin 80s linear infinite reverse;
}

/* orbit ring */
.av-orbit__orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 92%;
  aspect-ratio: 1 / 1;
  margin: -46% 0 0 -46%;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 50%;
  transform-style: preserve-3d;
  animation: av-orbit 16s linear infinite;
}

/* positioner: counter-rotates so Earth stays upright facing the viewer */
.av-orbit__pos {
  position: absolute;
  top: 50%;
  left: 0;
  width: 12%;
  aspect-ratio: 1 / 1;
  margin: -6% 0 0 -6%;
  transform-style: preserve-3d;
  animation: av-invert 16s linear infinite;
}

/* earth */
.av-orbit__earth {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background-color: #1e6fd9;
  background-image: radial-gradient(circle at 32% 30%,
    #bfe6ff 0%, #5aa9e6 28%, #1e6fd9 55%, #0a2a6b 80%, #020c26 100%);
  background-repeat: no-repeat;
  box-shadow:
    inset -12px -8px 22px rgba(0, 0, 10, .65),
    inset 6px 6px 14px rgba(255, 255, 255, .2),
    0 0 16px 4px rgba(90, 170, 255, .55);
  overflow: hidden;
}

/* continents */
.av-orbit__earth::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    radial-gradient(26% 20% at 30% 40%, #5da24f 0%, transparent 70%),
    radial-gradient(32% 24% at 65% 62%, #4c9440 0%, transparent 70%),
    radial-gradient(18% 28% at 56% 24%, #6faf57 0%, transparent 70%);
  animation: av-spin 26s linear infinite;
}

/* drifting clouds */
.av-orbit__earth::after {
  content: "";
  position: absolute;
  inset: -6%;
  border-radius: 50%;
  background:
    radial-gradient(30% 12% at 30% 35%, rgba(255, 255, 255, .85), transparent 70%),
    radial-gradient(24% 10% at 68% 55%, rgba(255, 255, 255, .75), transparent 70%),
    radial-gradient(20% 12% at 45% 75%, rgba(255, 255, 255, .7), transparent 70%),
    radial-gradient(16% 10% at 70% 25%, rgba(255, 255, 255, .65), transparent 70%);
  animation: av-spin 11s linear infinite reverse;
}

/* shooting star */
.av-orbit__shoot {
  position: absolute;
  top: 16%;
  left: -4%;
  width: 22%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, #fff, transparent);
  opacity: 0;
  animation: av-shoot 8s linear infinite;
}

@keyframes av-spin {
  to { transform: rotate(360deg); }
}

@keyframes av-orbit {
  0% { transform: rotateZ(0deg); }
  100% { transform: rotateZ(-360deg); }
}

@keyframes av-invert {
  0% { transform: rotateX(-90deg) rotateY(360deg) rotateZ(0deg); }
  100% { transform: rotateX(-90deg) rotateY(0deg) rotateZ(0deg); }
}

@keyframes av-pulse {
  0%, 100% { scale: 1; }
  50% { scale: 1.035; }
}

@keyframes av-twinkle {
  from { opacity: .55; }
  to { opacity: 1; }
}

@keyframes av-shoot {
  0% { transform: translateX(0) rotate(-24deg); opacity: 0; }
  4% { opacity: 1; }
  16% { transform: translateX(430%) rotate(-24deg); opacity: 0; }
  100% { transform: translateX(430%) rotate(-24deg); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .av-orbit__stars,
  .av-orbit__stars::after,
  .av-orbit__sun,
  .av-orbit__sun::before,
  .av-orbit__sun::after,
  .av-orbit__orbit,
  .av-orbit__pos,
  .av-orbit__earth::before,
  .av-orbit__earth::after,
  .av-orbit__shoot {
    animation: none;
  }
}