:root {
  --fondo: #f6f3ee;
  --papel: #fffdf9;
  --tinta: #1d2430;
  --suave: #5b6472;
  --marca: #1f3a5f;
  --marca-2: #2c5282;
  --borde: #ddd5c8;
  --resalte: #ffe69a;
  --error: #b42318;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --fondo: #14181f; --papel: #1c222c; --tinta: #eef1f5; --suave: #a8b0bd;
    --marca: #8fb3e8; --marca-2: #a9c5ef; --borde: #333c4a; --resalte: #6b5414; --error: #ff8a80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--fondo); color: var(--tinta);
  font: 18px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
[hidden] { display: none !important; }

.barra { background: #1f3a5f; color: #fff; padding: 14px 16px; }
.barra h1 { margin: 0 auto; max-width: 760px; font-size: 1.3rem; }

main { max-width: 760px; margin: 0 auto; padding: 16px 16px 200px; }
#v-inicio, #v-acceso, #v-proceso { padding-bottom: 40px; }

h2 { font-size: 1.3rem; margin: 0 0 8px; }
.nota { color: var(--suave); font-size: 1rem; }
.error { color: var(--error); font-weight: 600; min-height: 1.5em; }

.tarjeta { background: var(--papel); border: 1px solid var(--borde); border-radius: 16px; padding: 20px; }
.centro { text-align: center; }

button, .opcion, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border-radius: 12px; min-height: 52px; padding: 10px 18px; border: 0; }
.principal { background: var(--marca); color: #fff; font-weight: 700; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .principal { color: #0f1520; } }
.secundario { background: transparent; border: 2px solid var(--marca); color: var(--marca); font-weight: 600; }
.ancho { width: 100%; margin-top: 18px; }
button:disabled { opacity: .55; cursor: default; }
button:focus-visible, input:focus-visible, select:focus-visible, .opcion:focus-within { outline: 3px solid var(--marca-2); outline-offset: 2px; }

input, select, textarea {
  width: 100%; min-height: 52px; padding: 10px 14px; border-radius: 12px;
  border: 2px solid var(--borde); background: var(--papel);
}
textarea { resize: vertical; margin: 10px 0; }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
#v-acceso input { margin-bottom: 14px; }
#v-acceso .principal { width: 100%; }

/* Opciones de la pantalla inicial */
.opcion {
  display: flex; align-items: center; gap: 16px; width: 100%; text-align: left;
  background: var(--papel); border: 2px solid var(--borde); border-radius: 18px;
  padding: 18px; margin: 0 0 14px; cursor: pointer; font-weight: 400;
}
label.opcion { margin: 0 0 14px; }
.opcion b { display: block; font-size: 1.15rem; }
.opcion small { display: block; color: var(--suave); font-size: 1rem; }
.opcion .ico { font-size: 2rem; flex: none; width: 44px; text-align: center; }
.opcion.caja { cursor: default; align-items: flex-start; }
.opcion.continuar { border-color: var(--marca); background: color-mix(in srgb, var(--marca) 10%, var(--papel)); }
.crece { flex: 1; min-width: 0; }
.fila { display: flex; gap: 8px; margin-top: 8px; }
.fila input { flex: 1; min-width: 0; }
details.opcion { display: block; }
details.opcion summary { display: flex; align-items: center; gap: 16px; cursor: pointer; list-style: none; }
details.opcion summary::-webkit-details-marker { display: none; }
details .principal { width: 100%; }

/* Procesando */
progress { width: 100%; height: 14px; margin: 10px 0 18px; accent-color: var(--marca); }
.girando {
  width: 46px; height: 46px; margin: 6px auto 12px; border-radius: 50%;
  border: 5px solid var(--borde); border-top-color: var(--marca); animation: gira 1s linear infinite;
}
@keyframes gira { to { transform: rotate(360deg); } }

/* Lector */
.arriba { display: flex; flex-direction: column; gap: 12px; }
.arriba .secundario { align-self: flex-start; }
#titulo { overflow-wrap: anywhere; }
.ajustes { display: grid; grid-template-columns: 1.3fr 1fr 0.9fr; gap: 10px; margin-top: 4px; }
.ajustes label { margin: 0; font-size: 0.95rem; }
.ajustes select, .ajustes button { margin-top: 4px; width: 100%; }
@media (max-width: 420px) { .ajustes { grid-template-columns: 1fr 1fr; } .ajustes label:last-child { grid-column: span 2; } }

.texto {
  background: var(--papel); border: 1px solid var(--borde); border-radius: 16px;
  padding: 18px; font: 20px/1.7 Georgia, "Times New Roman", serif; overflow-wrap: anywhere;
}
.texto p { margin: 0 0 1em; }
.texto p:last-child { margin: 0; }
.texto span { cursor: pointer; border-radius: 4px; transition: background .2s; }
.texto span.actual { background: var(--resalte); box-shadow: 0 0 0 3px var(--resalte); }

.controles {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 5;
  background: var(--papel); border-top: 1px solid var(--borde);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  box-shadow: 0 -6px 20px rgb(0 0 0 / .08);
}
.controles > * { max-width: 728px; margin-left: auto; margin-right: auto; }
.controles input[type=range] { display: block; min-height: 32px; padding: 0; border: 0; background: none; accent-color: var(--marca); }
.fila-controles { display: flex; justify-content: center; align-items: center; gap: 22px; }
.redondo {
  width: 60px; height: 60px; border-radius: 50%; padding: 0; font-size: 1.5rem;
  background: transparent; border: 2px solid var(--marca); color: var(--marca);
}
.redondo.grande { width: 76px; height: 76px; font-size: 2rem; background: var(--marca); color: #fff; border: 0; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .redondo.grande { color: #0f1520; } }
.redondo.grande.cargando { animation: late 1s ease-in-out infinite; }
@keyframes late { 50% { opacity: .55; } }
.pos { text-align: center; margin: 4px auto 0; color: var(--suave); font-size: 1rem; }

.aviso {
  position: fixed; left: 16px; right: 16px; bottom: 190px; z-index: 10; margin: 0 auto; max-width: 600px;
  background: #1d2430; color: #fff; padding: 14px 18px; border-radius: 12px; text-align: center;
  box-shadow: 0 8px 24px rgb(0 0 0 / .25);
}