/**
 * Arold - Animation de fond (constellation)
 * Chaînes = noyaux, fans = électrons, notifications = traits.
 * Fichier isolé pour modularité. Chargé après main.css.
 */

/* --- Variables (thème light / dark) --- */
:root {
  --constellation-nucleus: rgba(185, 28, 28, 0.5);
  --constellation-nucleus-glow: rgba(220, 38, 38, 0.25);
  --constellation-play-icon: rgba(255, 255, 255, 0.9);
  --constellation-electron: rgba(220, 38, 38, 0.45);
  --constellation-electron-glow: rgba(220, 38, 38, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --constellation-nucleus: rgba(248, 113, 113, 0.45);
    --constellation-nucleus-glow: rgba(252, 165, 165, 0.2);
    --constellation-play-icon: rgba(255, 255, 255, 0.92);
    --constellation-electron: rgba(252, 165, 165, 0.5);
    --constellation-electron-glow: rgba(248, 113, 113, 0.25);
  }
}

html[data-theme="light"] {
  --constellation-nucleus: rgba(185, 28, 28, 0.5);
  --constellation-nucleus-glow: rgba(220, 38, 38, 0.25);
  --constellation-play-icon: rgba(255, 255, 255, 0.9);
  --constellation-electron: rgba(220, 38, 38, 0.45);
  --constellation-electron-glow: rgba(220, 38, 38, 0.2);
}

html[data-theme="dark"] {
  --constellation-nucleus: rgba(248, 113, 113, 0.45);
  --constellation-nucleus-glow: rgba(252, 165, 165, 0.2);
  --constellation-play-icon: rgba(255, 255, 255, 0.92);
  --constellation-electron: rgba(252, 165, 165, 0.5);
  --constellation-electron-glow: rgba(248, 113, 113, 0.25);
}

/* --- Container et systèmes --- */
.bg-constellation {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-constellation .nucleus-system {
  position: absolute;
  width: 0;
  height: 0;
  left: var(--sys-x, 50%);
  top: var(--sys-y, 50%);
  transform: translate(-50%, -50%);
}

/* Noyau = carte type miniature vidéo + triangle play */
.bg-constellation .nucleus {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--nucleus-width, 26px);
  height: var(--nucleus-height, 16px);
  margin-left: calc(var(--nucleus-width, 26px) / -2);
  margin-top: calc(var(--nucleus-height, 16px) / -2);
  border-radius: 3px;
  background: var(--constellation-nucleus);
  box-shadow: 0 0 16px var(--constellation-nucleus-glow);
  display: flex;
  align-items: center;
  justify-content: center;
}

.bg-constellation .nucleus-play {
  width: 0;
  height: 0;
  margin-left: 2px;
  border-style: solid;
  border-width: 5px 0 5px 8px;
  border-color: transparent transparent transparent var(--constellation-play-icon);
  flex-shrink: 0;
}

.bg-constellation .orbit {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 0;
  height: 0;
  transform-origin: center center;
  animation: constellation-orbit var(--orbit-duration, 25s) linear infinite;
  animation-delay: var(--orbit-delay, 0s);
}

.bg-constellation .orbit--reverse {
  animation-direction: reverse;
}

.bg-constellation .notification-line {
  position: absolute;
  left: 0;
  top: 50%;
  margin-top: -0.5px;
  width: var(--orbit-radius, 40vmin);
  height: 1px;
  transform-origin: 0 50%;
  background-image:
    linear-gradient(90deg, transparent 0%, transparent 8%, var(--constellation-nucleus) 12%, var(--constellation-electron) 60%, transparent 100%),
    linear-gradient(90deg, transparent 0%, var(--constellation-electron) 45%, var(--constellation-electron) 55%, transparent 100%);
  background-size: 100% 100%, 28% 100%;
  background-position: 0 0, -28% 0;
  background-repeat: no-repeat;
  opacity: 0.35;
  animation: constellation-notify var(--notify-duration, 4s) ease-in-out infinite;
  animation-delay: var(--notify-delay, 0s);
}

.bg-constellation .electron {
  position: absolute;
  left: 0;
  top: 50%;
  width: var(--electron-size, 6px);
  height: var(--electron-size, 6px);
  margin-left: calc(var(--electron-size, 6px) / -2);
  margin-top: calc(var(--electron-size, 6px) / -2);
  transform: translateX(var(--orbit-radius, 40vmin));
  transform-origin: 50% 50%;
  border-radius: 50%;
  background: var(--constellation-electron);
  box-shadow: 0 0 8px var(--constellation-electron-glow);
  animation: constellation-electron-star var(--notify-duration, 4s) ease-in-out infinite;
  animation-delay: var(--notify-delay, 0s);
}

.bg-constellation .electron::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 20px;
  height: 20px;
  transform: translate(-50%, -50%);
  transform-origin: 50% 50%;
  border-radius: 50%;
  background: repeating-conic-gradient(
    from 0deg,
    transparent 0deg 14deg,
    var(--constellation-electron-glow) 14deg 18deg
  );
  opacity: 0;
  pointer-events: none;
  animation: constellation-electron-rays var(--notify-duration, 4s) ease-in-out infinite;
  animation-delay: var(--notify-delay, 0s);
}

@keyframes constellation-electron-star {
  0%, 65%, 100% {
    transform: translateX(var(--orbit-radius, 40vmin)) scale(1);
    box-shadow: 0 0 8px var(--constellation-electron-glow);
    filter: brightness(1);
  }
  72%, 82% {
    transform: translateX(var(--orbit-radius, 40vmin)) scale(1.5);
    box-shadow: 0 0 20px var(--constellation-electron-glow), 0 0 40px var(--constellation-electron-glow);
    filter: brightness(1.6);
  }
}

@keyframes constellation-electron-rays {
  0%, 65%, 100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.6);
  }
  72%, 82% {
    opacity: 0.45;
    transform: translate(-50%, -50%) scale(1.4);
  }
}

@keyframes constellation-orbit {
  to { transform: rotate(360deg); }
}

@keyframes constellation-notify {
  0% { background-position: 0 0, -28% 0; }
  100% { background-position: 0 0, 128% 0; }
}

/* Liaisons électron ↔ autre noyau (quand un électron s’approche d’un noyau) */
.bg-constellation .constellation-bonds {
  overflow: visible;
}

.bg-constellation .constellation-bond {
  stroke: var(--constellation-electron);
  stroke-width: 1;
  stroke-opacity: 0.35;
  vector-effect: non-scaling-stroke;
}

@media (prefers-reduced-motion: reduce) {
  .bg-constellation .orbit { animation: none; }
  .bg-constellation .notification-line { animation: none; opacity: 0.3; }
  .bg-constellation .electron { animation: none; }
  .bg-constellation .electron::after { animation: none; opacity: 0; }
}