/* V16.3 — ambient cinematic layer */
.v16-ambient { position: fixed; inset: 0; pointer-events:none; z-index: 8; overflow:hidden; }
.v16-spark { position:absolute; width:3px; height:3px; border-radius:50%; background:rgba(255,215,120,.72);
  box-shadow:0 0 10px rgba(255,215,120,.65); opacity:0; animation:v16Spark 5.5s ease-in-out forwards; }
@keyframes v16Spark { 0%{opacity:0;transform:translate3d(0,18px,0) scale(.5)} 20%{opacity:.8} 75%{opacity:.35} 100%{opacity:0;transform:translate3d(0,-36px,0) scale(1.1)} }
.v16-butterfly { position:absolute; width:28px; height:20px; opacity:0; filter:drop-shadow(0 0 7px rgba(255,215,120,.35));
  animation:v16Butterfly 9s ease-in-out forwards; }
.v16-butterfly:before,.v16-butterfly:after { content:""; position:absolute; top:2px; width:13px;height:17px;
  border:1px solid rgba(231,190,90,.55); background:rgba(231,190,90,.10); border-radius:70% 30% 70% 30%; }
.v16-butterfly:before{left:1px;transform:rotate(24deg)} .v16-butterfly:after{right:1px;transform:scaleX(-1) rotate(24deg)}
@keyframes v16Butterfly { 0%{opacity:0;transform:translate(0,35px) rotate(-5deg)} 14%{opacity:.72}
  55%{opacity:.62;transform:translate(35px,-25px) rotate(7deg)} 100%{opacity:0;transform:translate(85px,-90px) rotate(-2deg)} }
.v16-reading-progress { position:fixed; top:0; left:0; width:0; height:2px; z-index:9999;
  background:linear-gradient(90deg,rgba(231,190,90,.15),rgba(231,190,90,.95),rgba(255,245,190,.55)); box-shadow:0 0 8px rgba(231,190,90,.45); }
.v16-music-pulse { animation:v16MusicPulse 1.7s ease-in-out infinite; }
@keyframes v16MusicPulse { 50%{transform:scale(1.05);filter:drop-shadow(0 0 7px rgba(231,190,90,.45))} }
.v16-moment-glow { animation:v16MomentGlow 1.6s ease-out; }
@keyframes v16MomentGlow { 0%{filter:brightness(.88)} 45%{filter:brightness(1.12)} 100%{filter:brightness(1)} }
@media (prefers-reduced-motion: reduce) {
  .v16-spark,.v16-butterfly,.v16-music-pulse,.v16-moment-glow { animation:none!important; }
}