/* BIBLIOTECA DA VIDA — TRILHA SONORA
 *
 * Selo compacto no cabeçalho, entre a versão e "Sobre". Usa o mesmo idioma
 * visual dos outros selos do cabeçalho/rodapé (.version, .motion, .origin):
 * borda fina translúcida, cantos bem arredondados, fundo verde-escuro
 * translúcido, tipografia 'Vida Sans'. Escuta apenas eventos do próprio
 * <audio> (tocado/pausado) para animar — nunca lê o áudio de verdade
 * (sem AnalyserNode), então o custo é o de qualquer transição de CSS.
 */
.trilha{
  display:inline-flex;
  align-items:center;
  gap:2px;
  padding:4px 6px 4px 8px;
  border:1px solid #6f99824d;
  border-radius:22px;
  background:#1c3a3199;
  color:#bdd3c4;
  font-family:'Vida Sans',sans-serif;
  font-size:12px;
  line-height:1;
  flex-shrink:0;
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}
.st-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  width:24px;
  height:24px;
  padding:0;
  border:0;
  border-radius:50%;
  background:transparent;
  color:#cfe4d7;
  flex-shrink:0;
  transition:background .18s,color .18s,transform .12s;
}
.st-btn svg{width:15px;height:15px;display:block}
.st-btn:hover{background:#37594b;color:#eef8f1}
.st-btn:active{transform:scale(.92)}
.st-play{width:26px;height:26px}
.st-play svg{width:16px;height:16px}
.st-play .st-icon-play{display:block}
.st-play .st-icon-pause{display:none}
.trilha.st-playing .st-play .st-icon-play{display:none}
.trilha.st-playing .st-play .st-icon-pause{display:block}

/* Visualizador: 4 barrinhas, paradas por padrão. Só animam com .st-playing
 * no container — pausar o áudio congela e some a barra na hora, sem
 * depender de medir o áudio de verdade. */
.st-viz{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:2.5px;
  width:16px;
  height:14px;
  margin:0 2px;
  flex-shrink:0;
}
.st-viz span{
  width:2.5px;
  height:4px;
  border-radius:1.5px;
  background:#8fd6ad;
  opacity:.55;
  transform-origin:center;
}
.trilha.st-playing .st-viz span{
  opacity:1;
  animation:st-viz-bounce 1s ease-in-out infinite;
}
.trilha.st-playing .st-viz span:nth-child(1){animation-delay:-.9s}
.trilha.st-playing .st-viz span:nth-child(2){animation-delay:-.6s}
.trilha.st-playing .st-viz span:nth-child(3){animation-delay:-.3s}
.trilha.st-playing .st-viz span:nth-child(4){animation-delay:0s}
@keyframes st-viz-bounce{
  0%,100%{height:4px}
  50%{height:13px}
}

.st-title{
  width:110px;
  min-width:0;
  flex-shrink:0;
  overflow:hidden;
  white-space:nowrap;
  text-overflow:ellipsis;
  color:#9fbfae;
  font-size:11px;
  margin:0 2px;
}

.st-volume{position:relative;display:flex;align-items:center;flex-shrink:0}
.trilha .st-icon-vol-off{display:none}
.trilha.st-muted .st-icon-vol-on{display:none}
.trilha.st-muted .st-icon-vol-off{display:block}
.st-vol-pop{
  position:absolute;
  bottom:100%;
  right:-6px;
  padding-bottom:9px;
  max-width:calc(100vw - 24px);
  opacity:0;
  visibility:hidden;
  transition:opacity .16s,visibility .16s;
  z-index:30;
}
.st-vol-pop-inner{
  display:flex;
  align-items:center;
  padding:9px 12px;
  border:1px solid #6f99824d;
  border-radius:16px;
  background:#1c3a31e8;
  box-shadow:0 12px 30px #0005;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transform:translateY(4px);
  transition:transform .16s;
}
.st-volume:hover .st-vol-pop,
.st-volume.st-aberto .st-vol-pop,
.st-vol-pop:focus-within{
  opacity:1;
  visibility:visible;
}
.st-volume:hover .st-vol-pop-inner,
.st-volume.st-aberto .st-vol-pop-inner,
.st-vol-pop:focus-within .st-vol-pop-inner{
  transform:translateY(0);
}
.st-vol-slider{
  width:80px;
  height:3px;
  accent-color:#8fd6ad;
  cursor:pointer;
}

@media(max-width:760px){
  .trilha{padding:3px 5px 3px 7px;gap:1px}
  .st-btn{width:22px;height:22px}
  .st-play{width:24px;height:24px}
  .st-title{display:none}
}
@media(max-width:600px){
  .st-viz{display:none}
}
@media(max-width:480px){
  .st-volume{display:none}
}

/* v0.361 — a trilha agora mora na barra fixa (rodapé), ao lado da versão e
   do botão "Pausar movimento". Ajuste fino de tamanho para caber bem numa
   barra mais baixa e ao lado de outros controles compactos; o
   comportamento (anterior/play-pause/próxima/visualizador/volume) não
   muda. */
.footer-meta .trilha{
  padding:3px 5px 3px 7px;
  gap:1px;
}
.footer-meta .st-btn{width:22px;height:22px}
.footer-meta .st-play{width:24px;height:24px}
.footer-meta .st-btn svg{width:14px;height:14px}
.footer-meta .st-play svg{width:15px;height:15px}