:root{
  --fondo:#e8edef;
  --papel:#f7f9f9;
  --tinta:#1a2a38;
  --tinta-suave:#4b5d6b;
  --acento:#1f6f78;
  --acento-oscuro:#164f56;
  --arena:#d6c7a4;
  --linea:#c3ced3;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--fondo);color:var(--tinta);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.55;
}
.serif{font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif}
main{max-width:720px;margin:0 auto;padding:28px 18px 64px}
h1{font-size:clamp(2rem,7vw,3rem);line-height:1.08;margin:0 0 10px;font-weight:600;letter-spacing:-.01em}
.bajada{margin:0 0 24px;color:var(--tinta-suave);font-size:1.05rem;max-width:56ch}
h2{font-size:1.35rem;margin:40px 0 10px;font-weight:600}
p{max-width:68ch}

.aviso{
  background:var(--papel);border-left:4px solid var(--arena);
  padding:10px 14px;margin:0 0 20px;font-size:.95rem;
}

.visor{background:var(--papel);border:1px solid var(--linea);border-radius:6px;padding:14px 14px 10px}
.visor canvas{display:block;width:100%;height:232px}
.lectura{
  display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  margin-top:6px;font-size:.95rem;color:var(--tinta-suave);
}
.lectura span:last-child{white-space:nowrap}
.lectura strong{font-size:1.5rem;color:var(--tinta);font-weight:600}

.reproducir{display:flex;align-items:center;gap:14px;margin-top:18px}
#btnPlay{
  flex:1;min-height:56px;font:inherit;font-size:1.1rem;font-weight:600;
  background:var(--acento);color:#fff;border:0;border-radius:4px;cursor:pointer;
}
#btnPlay:hover{background:var(--acento-oscuro)}
#btnPlay[aria-pressed="true"]{background:var(--tinta)}
#restante{min-width:84px;text-align:right;color:var(--tinta-suave);font-variant-numeric:tabular-nums}

.panel{margin-top:18px;background:var(--papel);border:1px solid var(--linea);border-radius:6px;padding:16px}
.panel h3{margin:0 0 10px;font-size:1rem;font-weight:600}
.panel + .panel{margin-top:12px}
.grupo{display:flex;flex-wrap:wrap;gap:8px}
.grupo button{
  flex:1 1 140px;text-align:left;padding:10px 12px;border-radius:4px;
  border:1px solid var(--linea);background:#fff;color:var(--tinta);
  font:inherit;cursor:pointer;min-height:48px;
}
.grupo button small{display:block;color:var(--tinta-suave);font-size:.82rem}
.grupo button[aria-pressed="true"]{
  border-color:var(--acento);background:#e3f0f1;box-shadow:inset 0 0 0 1px var(--acento);
}
.grupo.chico button{flex:0 1 auto;text-align:center;padding:8px 14px;min-height:44px}
.panel h4{margin:18px 0 8px;font-size:.92rem;font-weight:600;color:var(--tinta-suave)}
.panel h4:first-of-type{margin-top:4px}
.capa{display:grid;grid-template-columns:104px 1fr 44px;align-items:center;gap:10px;margin-top:8px}
.capa button{
  text-align:center;padding:8px 10px;border-radius:4px;border:1px solid var(--linea);
  background:#fff;color:var(--tinta);font:inherit;cursor:pointer;min-height:44px;
}
.capa button[aria-pressed="true"]{border-color:var(--acento);background:#e3f0f1;box-shadow:inset 0 0 0 1px var(--acento)}
.capa input[type=range]:disabled{opacity:.45}
.capa output{color:var(--tinta-suave);font-size:.9rem;text-align:right;font-variant-numeric:tabular-nums}
.nota-preset{margin:12px 0 0;color:var(--tinta-suave);font-size:.95rem;min-height:3em}

.campo{margin-top:14px}
.campo label{display:flex;justify-content:space-between;font-size:.95rem;margin-bottom:4px}
.campo output{color:var(--tinta-suave)}
.ayuda{margin:2px 0 0;font-size:.85rem;color:var(--tinta-suave)}
input[type=range]{width:100%;accent-color:var(--acento);height:32px}

button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #e0a000;outline-offset:2px}

.btn-sec{min-height:48px;padding:10px 16px;font:inherit;font-weight:600;border:1px solid var(--acento);background:#fff;color:var(--acento-oscuro);border-radius:4px;cursor:pointer}
.btn-sec:disabled{opacity:.6;cursor:progress}
input[type=checkbox]{accent-color:var(--acento);width:22px;height:22px}
table{border-collapse:collapse;width:100%;max-width:68ch;font-size:.95rem;margin:10px 0}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--linea);vertical-align:top}
th{font-weight:600}
details{border-bottom:1px solid var(--linea);padding:10px 0}
summary{cursor:pointer;font-weight:600}
details p{margin:8px 0 2px;color:var(--tinta-suave)}
.nota{font-size:.88rem;color:var(--tinta-suave);margin-top:28px}

.resp{display:flex;flex-direction:column;align-items:center;gap:12px;margin:14px 0 6px}
.resp-escena{position:relative;width:min(220px,60vw);aspect-ratio:1;display:grid;place-items:center}
.resp-circulo{width:100%;height:100%;border-radius:50%;background:#e3f0f1;border:2px solid var(--acento);transform:scale(var(--esc,.7))}
.resp-circulo.inhala{background:#c9e3e6}
.resp-texto{position:absolute;inset:0;display:grid;place-content:center;text-align:center;font-weight:600;font-size:1.3rem;pointer-events:none}
.resp-texto small{display:block;font-weight:400;font-size:1rem;color:var(--tinta-suave);min-height:1.4em}

@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* ---------- Calmarte: cabecera, lema, interruptor de tono binaural, pie ---------- */
[hidden]{display:none!important}
a{color:var(--acento-oscuro)}
.cabecera{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:0 20px;margin:-10px 0 18px}
.marca{font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;font-size:1.3rem;font-weight:600;color:var(--tinta);text-decoration:none;padding:10px 0}
.nav a{display:inline-block;padding:10px 0;margin-left:18px;font-weight:600;text-decoration:none}
.nav a:first-child{margin-left:0}
.nav a[aria-current="page"]{text-decoration:underline;text-underline-offset:5px}
.lema{margin:0 0 6px;font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;font-style:italic;font-size:1.2rem;color:var(--acento-oscuro)}

body.bin-off .solo-binaural{display:none}
body.bin-on .solo-ambiente{display:none}
body.bin-off .visor{opacity:.45}
.visor .lectura .solo-ambiente{width:100%;text-align:center}

.pie{margin-top:40px;padding-top:18px;border-top:1px solid var(--linea);font-size:.9rem;color:var(--tinta-suave)}
.pie p{margin:6px 0}
.pie .marca-pie{font-weight:600;color:var(--tinta)}
.aportes{display:inline-block;margin-top:8px;padding:10px 16px;min-height:44px;border:1px solid var(--linea);border-radius:4px;background:#fff;color:var(--acento-oscuro);font-weight:600;text-decoration:none}
.aportes:hover{border-color:var(--acento)}