:root {
  --tinta: #16181d;
  --suave: #5f6570;
  --tenue: #8b9099;
  --linea: #e6e7ea;
  --plano: #f5f6f7;
  --blanco: #ffffff;
  --acento: #2f6f5e;
  --radio: 14px;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--blanco);
  color: var(--tinta);
  font: 16px/1.55 "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }
.ancho { max-width: 1240px; margin: 0 auto; padding: 0 28px; }

/* barra superior */
.barra { border-bottom: 1px solid var(--linea); }
.barra .ancho { display: flex; align-items: baseline; gap: 12px; height: 60px; align-items: center; }
.marca { font-weight: 600; letter-spacing: .02em; font-size: 17px; text-decoration: none; }
.barra-sub { color: var(--tenue); font-size: 14px; }
.barra .volver { margin-left: auto; font-size: 14px; color: var(--suave); text-decoration: none; }
.barra .volver:hover { color: var(--tinta); }

/* indice */
.intro { padding: 48px 0 8px; max-width: 640px; }
.intro h1 { font-size: 40px; line-height: 1.1; margin: 0 0 10px; font-weight: 600; letter-spacing: -.01em; }
.intro p { margin: 0; color: var(--suave); font-size: 17px; }
.linea { padding: 36px 0 8px; }
.linea h2 { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--suave); margin: 0 0 16px; }
.punto { width: 10px; height: 10px; border-radius: 50%; background: var(--acento); }
.grilla { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.tarjeta { display: block; text-decoration: none; border: 1px solid var(--linea); border-radius: var(--radio);
  overflow: hidden; background: var(--blanco); transition: border-color .15s, transform .15s; }
.tarjeta:hover { border-color: var(--acento); transform: translateY(-2px); }
.tarjeta-img { aspect-ratio: 1; background: var(--blanco); }
.tarjeta-img img { width: 100%; height: 100%; object-fit: cover; }
.tarjeta-txt { padding: 14px 16px 16px; border-top: 1px solid var(--linea); }
.tarjeta-txt h3 { font-size: 16px; font-weight: 600; margin: 0 0 2px; }
.tarjeta-txt p { margin: 0; color: var(--suave); font-size: 14px; }
.tarjeta-meta { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 8px !important; font-size: 13px !important; color: var(--tenue) !important; }
.pie { color: var(--tenue); font-size: 13px; padding-top: 48px; padding-bottom: 40px; }

/* producto */
.cabeza { padding: 28px 0 18px; }
.cabeza .linea-nombre { color: var(--acento); font-weight: 600; font-size: 14px; letter-spacing: .06em; text-transform: uppercase; margin: 0 0 4px; }
.cabeza h1 { font-size: 34px; line-height: 1.15; margin: 0 0 6px; font-weight: 600; letter-spacing: -.01em; }
.cabeza .desc { margin: 0; color: var(--suave); }
.cuerpo { display: grid; grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr); gap: 28px; align-items: start; }

.visor { position: relative; border: 1px solid var(--linea); border-radius: var(--radio); background: var(--blanco); overflow: hidden; }
/* model-viewer no toma aspect-ratio: la altura va explicita */
model-viewer { width: 100%; height: min(68vh, 640px); min-height: 420px; background: var(--blanco); --poster-color: var(--blanco); display: block; }
.selector { position: absolute; top: 14px; left: 14px; display: flex; gap: 4px; padding: 4px; background: rgba(255,255,255,.92);
  border: 1px solid var(--linea); border-radius: 999px; z-index: 2; }
.selector button { border: 0; background: transparent; padding: 7px 16px; border-radius: 999px; cursor: pointer; font-size: 14px; color: var(--suave); }
.selector button[aria-pressed="true"] { background: var(--tinta); color: var(--blanco); }
.selector button:hover:not([aria-pressed="true"]) { color: var(--tinta); background: var(--plano); }
.boton-ar { position: absolute; right: 14px; bottom: 14px; border: 0; border-radius: 999px; padding: 9px 16px; background: var(--tinta); color: #fff; font-size: 14px; cursor: pointer; }
.progreso { position: absolute; left: 0; right: 0; top: 0; height: 2px; }
.progreso-barra { height: 100%; width: 0; background: var(--acento); transition: width .2s; }
.progreso.oculto { display: none; }

.ayudas { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; padding: 12px 4px 0; color: var(--tenue); font-size: 13px; }
.ayudas span { display: inline-flex; align-items: center; gap: 7px; }
.ayudas svg { width: 17px; height: 17px; flex: none; }
.ayudas .acciones { margin-left: auto; display: flex; gap: 8px; }
.chico { border: 1px solid var(--linea); background: var(--blanco); border-radius: 999px; padding: 5px 12px; font-size: 13px; color: var(--suave); cursor: pointer; }
.chico:hover { color: var(--tinta); border-color: #cfd2d7; }
.chico[aria-pressed="true"] { color: var(--tinta); border-color: var(--tinta); }

.specs { border: 1px solid var(--linea); border-radius: var(--radio); padding: 6px 18px 10px; position: sticky; top: 20px; }
.specs h2 { font-size: 15px; font-weight: 600; margin: 12px 0 6px; }
.specs details { border-top: 1px solid var(--linea); }
.specs details:first-of-type { border-top: 0; }
.specs summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; padding: 12px 0; font-weight: 600; font-size: 14px; }
.specs summary::-webkit-details-marker { display: none; }
.specs summary::after { content: ""; width: 8px; height: 8px; border-right: 1.5px solid var(--tenue); border-bottom: 1.5px solid var(--tenue); transform: rotate(45deg); transition: transform .15s; margin-right: 4px; }
.specs details[open] summary::after { transform: rotate(-135deg); }
.specs dl { margin: 0 0 12px; display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 6px 12px; font-size: 14px; }
.specs dt { color: var(--tenue); }
.specs dd { margin: 0; }

.fotos { padding: 40px 0 8px; }
.fotos-cab { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.fotos-cab h2 { font-size: 20px; font-weight: 600; margin: 0; }
.fotos-cab p { margin: 0; color: var(--tenue); font-size: 14px; }
.galeria { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.miniatura { border: 1px solid var(--linea); border-radius: 10px; background: var(--blanco); padding: 0; overflow: hidden; cursor: zoom-in; text-align: left; }
.miniatura img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.miniatura span { display: block; padding: 8px 10px; font-size: 13px; color: var(--suave); border-top: 1px solid var(--linea); }
.miniatura:hover { border-color: var(--acento); }
.vacio { color: var(--tenue); font-size: 14px; border: 1px dashed var(--linea); border-radius: 10px; padding: 22px; text-align: center; }

.otros { display: flex; justify-content: space-between; gap: 16px; padding: 40px 0 48px; font-size: 14px; }
.otros a { text-decoration: none; color: var(--suave); }
.otros a:hover { color: var(--tinta); }

/* vista previa de una foto */
dialog.previa { border: 0; padding: 0; width: min(1100px, 94vw); max-height: 94vh; border-radius: 16px; background: var(--blanco); color: var(--tinta); }
dialog.previa::backdrop { background: rgba(14, 16, 20, .72); }
.previa-marco { position: relative; background: var(--blanco); }
.previa-marco img { width: 100%; max-height: calc(94vh - 72px); object-fit: contain; margin: 0 auto; }
.previa-pie { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-top: 1px solid var(--linea); }
.previa-pie .nombre { font-weight: 600; font-size: 14px; }
.previa-pie .peso { color: var(--tenue); font-size: 13px; }
.descargar { margin-left: auto; text-decoration: none; background: var(--tinta); color: #fff; border-radius: 999px; padding: 9px 16px; font-size: 14px; white-space: nowrap; }
.flecha, .cerrar { position: absolute; border: 1px solid var(--linea); background: rgba(255,255,255,.95); width: 40px; height: 40px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.flecha { top: 50%; transform: translateY(-50%); }
.flecha.izq { left: 12px; } .flecha.der { right: 12px; }
.cerrar { top: 12px; right: 12px; }
.flecha svg, .cerrar svg { width: 18px; height: 18px; }

@media (max-width: 900px) {
  .ancho { padding: 0 16px; }
  .cuerpo { grid-template-columns: minmax(0, 1fr); }
  .specs { position: static; }
  .galeria { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cabeza h1, .intro h1 { font-size: 28px; }
  model-viewer { height: 92vw; min-height: 320px; max-height: 520px; }
  .ayudas .acciones { margin-left: 0; }
  .previa-pie { flex-wrap: wrap; }
  .descargar { margin-left: 0; }
}