/* ambient-extras — motion module (Anand & Palak).
   Decorative particle life layered on top of the existing hero art:
     - slide2: rose petals drifting down through the central light beam
     - slide3: an occasional shooting star + fireflies near the lit trees
   Self-contained: scoped under .stage--slideN, transform/opacity only,
   paused off-screen via IntersectionObserver (see ambient-extras.js). */

/* --- Shared container --- */
.amb-extras {
  position: absolute;
  inset: 0;
  z-index: 20; /* above all hero/text layers (max ~14), below fixed UI (40+) */
  pointer-events: none;
  overflow: hidden;
}

/* Pause every particle in a slide when its stage is off-screen (perf). */
.amb-extras.is-paused .amb-petal,
.amb-extras.is-paused .amb-firefly,
.amb-extras.is-paused .amb-shootingstar {
  animation-play-state: paused;
}

/* --- Slide 2: rose petals falling through the light beam --------------- */
.amb-petal {
  position: absolute;
  top: -6%;
  left: var(--x, 50%);
  width: var(--w, 10px);
  height: var(--h, 8px);
  /* Small crimson petal: rounded diamond via border-radius asymmetry. */
  background: radial-gradient(120% 130% at 30% 25%, #ff8a7a 0%, #c4243a 45%, #6e0f1f 100%);
  border-radius: 0% 60% 0% 60%;
  opacity: 0;
  transform: translate3d(0, 0, 0) rotate(var(--r0, 0deg));
  will-change: transform, opacity;
  animation: amb-petal-fall var(--d, 12s) linear var(--delay, 0s) infinite;
}

@keyframes amb-petal-fall {
  0%   { opacity: 0;   transform: translate3d(0, 0, 0) translateX(0) rotate(var(--r0, 0deg)); }
  8%   { opacity: 0.85; }
  50%  { transform: translate3d(0, 55svh, 0) translateX(var(--sway, 14px)) rotate(calc(var(--r0, 0deg) + 130deg)); }
  92%  { opacity: 0.8; }
  100% { opacity: 0;   transform: translate3d(0, 112svh, 0) translateX(0) rotate(calc(var(--r0, 0deg) + 260deg)); }
}

/* --- Slide 3: fireflies near the lit trees ------------------------------ */
.amb-firefly {
  position: absolute;
  left: var(--x, 15%);
  top: var(--y, 55%);
  width: var(--s, 4px);
  height: var(--s, 4px);
  border-radius: 50%;
  background: #ffd27a;
  box-shadow: 0 0 4px 1.5px rgba(255, 200, 110, 0.85), 0 0 9px 4px rgba(255, 170, 60, 0.35);
  opacity: 0;
  will-change: transform, opacity;
  animation: amb-firefly-drift var(--d, 9s) ease-in-out var(--delay, 0s) infinite;
}

@keyframes amb-firefly-drift {
  0%   { opacity: 0;    transform: translate3d(0, 0, 0); }
  20%  { opacity: 0.9; }
  35%  { transform: translate3d(var(--dx1, 8px), var(--dy1, -10px), 0); }
  50%  { opacity: 0.25; }
  65%  { transform: translate3d(var(--dx2, -6px), var(--dy2, -4px), 0); }
  80%  { opacity: 0.85; }
  100% { opacity: 0;    transform: translate3d(0, 0, 0); }
}

/* --- Slide 3: occasional shooting star across the upper sky ------------ */
.amb-shootingstar {
  position: absolute;
  top: var(--y, 12%);
  left: var(--x, -10%);
  width: 84px;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.55) 22%, transparent 100%);
  border-radius: 2px;
  opacity: 0;
  transform: translate3d(0, 0, 0) rotate(24deg);
  transform-origin: 0% 50%;
  will-change: transform, opacity;
  animation: amb-shoot var(--d, 14s) linear var(--delay, 0s) infinite;
}

@keyframes amb-shoot {
  0%    { opacity: 0; transform: translate3d(0, 0, 0) rotate(24deg); }
  2%    { opacity: 1; }
  9%    { opacity: 1; transform: translate3d(46vmax, 22vmax, 0) rotate(24deg); }
  13%   { opacity: 0; transform: translate3d(58vmax, 28vmax, 0) rotate(24deg); }
  100%  { opacity: 0; transform: translate3d(58vmax, 28vmax, 0) rotate(24deg); }
}

/* --- Respect reduced motion: render no particles at all ----------------- */
@media (prefers-reduced-motion: reduce) {
  .amb-extras { display: none; }
}