:root {
  color-scheme: dark;
  --space-1: #04070f;
  --space-2: #0f1c35;
  --space-3: #09111f;
  --jupiter-1: #f6d2a6;
  --jupiter-2: #d9a56d;
  --jupiter-3: #9d6538;
  --jupiter-shadow: rgba(2, 4, 10, 0.4);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(148, 178, 255, 0.12), transparent 26%),
    radial-gradient(circle at 78% 30%, rgba(255, 226, 163, 0.08), transparent 22%),
    linear-gradient(180deg, var(--space-2), var(--space-3) 34%, var(--space-1));
  font-family: Georgia, "Times New Roman", serif;
}

.scene {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}

.system {
  position: relative;
  width: min(1200px, 96vw);
  height: min(74vh, 760px);
  border-radius: 40px;
  overflow: hidden;
  background:
    radial-gradient(circle at center, rgba(65, 90, 136, 0.14), transparent 30%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.04), transparent 62%);
  box-shadow:
    inset 0 0 0 1px rgba(205, 223, 255, 0.08),
    0 36px 120px rgba(1, 3, 12, 0.55);
}

.system::before,
.system::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.system::before {
  background-image:
    radial-gradient(circle at 12% 26%, rgba(255, 255, 255, 0.85) 0 1px, transparent 1.5px),
    radial-gradient(circle at 18% 68%, rgba(255, 255, 255, 0.45) 0 1px, transparent 1.5px),
    radial-gradient(circle at 29% 18%, rgba(255, 255, 255, 0.35) 0 1px, transparent 1.5px),
    radial-gradient(circle at 65% 20%, rgba(255, 255, 255, 0.4) 0 1px, transparent 1.5px),
    radial-gradient(circle at 74% 64%, rgba(255, 255, 255, 0.75) 0 1px, transparent 1.5px),
    radial-gradient(circle at 88% 32%, rgba(255, 255, 255, 0.45) 0 1px, transparent 1.5px),
    radial-gradient(circle at 82% 76%, rgba(255, 255, 255, 0.3) 0 1px, transparent 1.5px);
}

.system::after {
  background:
    linear-gradient(90deg, rgba(6, 11, 23, 0.8), transparent 10%, transparent 90%, rgba(6, 11, 23, 0.8)),
    linear-gradient(180deg, rgba(6, 11, 23, 0.55), transparent 14%, transparent 86%, rgba(6, 11, 23, 0.55));
}

.axis {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
  background: linear-gradient(90deg, transparent, rgba(180, 205, 255, 0.28), transparent);
}

.planet-wrap {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 110px;
  height: 110px;
  transform: translate(-50%, -50%);
}

.planet-canvas,
.planet-shade {
  position: absolute;
  inset: 0;
  border-radius: 50%;
}

.planet-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 34% 30%, rgba(255, 245, 226, 0.96), transparent 28%),
    linear-gradient(
      180deg,
      #f9e0bd 0 12%,
      #bb7e4e 12% 20%,
      #f0c18d 20% 30%,
      #a86839 30% 38%,
      #f4d2a7 38% 49%,
      #815536 49% 55%,
      #efc59b 55% 67%,
      #9c6945 67% 75%,
      #f0c089 75% 86%,
      #ba7f4f 86% 100%
    );
  box-shadow:
    inset -16px -12px 28px rgba(79, 43, 20, 0.38),
    inset 12px 10px 20px rgba(255, 247, 225, 0.28),
    0 0 60px rgba(239, 192, 137, 0.18);
}

.planet-shade {
  background:
    radial-gradient(circle at 33% 30%, rgba(255, 250, 239, 0.32), transparent 28%),
    radial-gradient(circle at 68% 68%, rgba(0, 0, 0, 0.16), transparent 36%),
    radial-gradient(circle at center, transparent 58%, rgba(12, 18, 29, 0.14) 100%);
  box-shadow:
    inset -18px -12px 28px rgba(58, 30, 14, 0.16),
    inset 12px 10px 20px rgba(255, 245, 221, 0.12);
  pointer-events: none;
}

.planet-glow {
  position: absolute;
  inset: -26px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 208, 144, 0.18), transparent 62%);
}

.moon {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 16px currentColor;
}

.moon::after {
  content: "";
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.26), transparent 64%);
  opacity: 0.8;
}

.moon-io {
  color: #FF2F01;
  background: #FF2F01;
}

.moon-europa {
  color: #B1D8E2;
  background: #B1D8E2;
}

.moon-ganymede {
  color: #FFB300;
  background: #FFB300;
}

.moon-callisto {
  color: #1BC022;
  background: #1BC022;
}

.moon-label {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: clamp(9px, 1vw, 12px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1;
  white-space: nowrap;
  text-shadow:
    0 0 10px rgba(0, 0, 0, 0.65),
    0 2px 12px rgba(0, 0, 0, 0.55);
  pointer-events: none;
}

.moon-label-io {
  color: #FF2F01;
}

.moon-label-europa {
  color: #B1D8E2;
}

.moon-label-ganymede {
  color: #FFB300;
}

.moon-label-callisto {
  color: #1BC022;
}

.moon.is-occulted {
  opacity: 0;
}

.moon.is-transiting {
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.08);
  filter: saturate(0.6) brightness(0.78);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 720px) {
  .scene {
    padding: 12px;
  }

  .system {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
  }

  .planet-wrap {
    width: 86px;
    height: 86px;
  }
}