/*
  sonido.css — Boton de paisajes sonoros (js/sonido.js).
  Vidrio oscuro rgba(10,10,15,.75) + blur 16px + borde 1px rgba(255,255,255,.1),
  detalles dorados #D4AF37. Objetivo tactil 44x44. Foco visible dorado.
  La animacion de las ondas y el pulso de la primera vez respetan
  prefers-reduced-motion.
*/
.sv {
  position: relative;
  display: inline-flex;
  flex: none;
  --sv-gold: #d4af37;
  --sv-gold-hi: #f2d27a;
}
.sv--flotante {
  position: fixed;
  z-index: 60;
  top: calc(12px + env(safe-area-inset-top, 0px));
  right: calc(12px + env(safe-area-inset-right, 0px));
}

.sv-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 999px;
  background: rgba(10, 10, 15, 0.75);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  color: #c9cde2;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.25s ease, color 0.25s ease, background-color 0.25s ease;
}
.sv-btn:hover { color: var(--sv-gold-hi); border-color: rgba(212, 175, 55, 0.55); }
.sv-btn:focus { outline: none; }
.sv-btn:focus-visible {
  outline: 2px solid var(--sv-gold);
  outline-offset: 3px;
}
.sv-btn.is-on {
  color: var(--sv-gold);
  border-color: rgba(212, 175, 55, 0.45);
  background: rgba(14, 12, 6, 0.78);
}

/* ---------- icono: barras de ondas ---------- */
.sv-ico { width: 22px; height: 22px; overflow: visible; }
.sv-bar {
  fill: currentColor;
  transform-box: fill-box;
  transform-origin: 50% 50%;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease;
}
/* silenciado: ondas bajas y apagadas */
.sv-bar { transform: scaleY(0.16); opacity: 0.7; }
.sv-bar--1, .sv-bar--3 { transform: scaleY(0.3); }
.sv-bar--2 { transform: scaleY(0.44); }
/* sonando: perfil de onda */
.sv-btn.is-on .sv-bar { opacity: 1; }
.sv-btn.is-on .sv-bar--0, .sv-btn.is-on .sv-bar--4 { transform: scaleY(0.32); }
.sv-btn.is-on .sv-bar--1, .sv-btn.is-on .sv-bar--3 { transform: scaleY(0.62); }
.sv-btn.is-on .sv-bar--2 { transform: scaleY(0.95); }

@media (prefers-reduced-motion: no-preference) {
  .sv-btn.is-on .sv-bar { animation: sv-ola 2.6s ease-in-out infinite; }
  .sv-btn.is-on .sv-bar--0 { animation-delay: -0.4s; --sv-a: 0.22; --sv-b: 0.42; }
  .sv-btn.is-on .sv-bar--1 { animation-delay: -1.1s; --sv-a: 0.42; --sv-b: 0.78; }
  .sv-btn.is-on .sv-bar--2 { animation-delay: -1.8s; --sv-a: 0.62; --sv-b: 1; }
  .sv-btn.is-on .sv-bar--3 { animation-delay: -0.7s; --sv-a: 0.4; --sv-b: 0.74; }
  .sv-btn.is-on .sv-bar--4 { animation-delay: -1.5s; --sv-a: 0.2; --sv-b: 0.4; }
}
@keyframes sv-ola {
  0%, 100% { transform: scaleY(var(--sv-a, 0.4)); }
  50% { transform: scaleY(var(--sv-b, 0.8)); }
}

/* ---------- indicacion de la primera vez ---------- */
.sv-btn::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
}
.sv-btn.is-hint { border-color: rgba(212, 175, 55, 0.6); color: var(--sv-gold-hi); }
@media (prefers-reduced-motion: no-preference) {
  .sv-btn.is-hint::after { animation: sv-pulso 2.2s ease-out 3; }
}
@keyframes sv-pulso {
  0% { opacity: 0.9; box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.55); }
  100% { opacity: 0; box-shadow: 0 0 0 12px rgba(212, 175, 55, 0); }
}

.sv-tip {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 2;
  padding: 7px 12px;
  border-radius: 10px;
  background: rgba(10, 10, 15, 0.82);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(212, 175, 55, 0.35);
  color: #f1e3b3;
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.35s ease, transform 0.35s ease, visibility 0s linear 0.35s;
}
.sv-tip::before {
  content: "";
  position: absolute;
  top: -5px;
  right: 18px;
  width: 8px;
  height: 8px;
  background: inherit;
  border-left: 1px solid rgba(212, 175, 55, 0.35);
  border-top: 1px solid rgba(212, 175, 55, 0.35);
  transform: rotate(45deg);
}
.sv.is-hint .sv-tip {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity 0.35s ease, transform 0.35s ease, visibility 0s;
}

@media (prefers-reduced-motion: reduce) {
  .sv-btn, .sv-bar, .sv-tip { transition: none; }
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .sv-btn, .sv-tip { background: rgba(10, 10, 15, 0.92); }
}