/* Bingo Master — sitio web. Sin dependencias externas. */
:root {
  --fondo: #f6f7fb;
  --panel: #ffffff;
  --tinta: #172033;
  --suave: #55617a;
  --linea: #dfe4ec;
  --marino: #1d2a44;
  --naranja: #ff9800;
  --naranja-osc: #c26100;
  --azul: #2f7cff;
  --verde: #1a9a52;
  --sombra: 0 10px 30px rgba(20, 30, 55, .12);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fondo: #0f131b;
    --panel: #181e2a;
    --tinta: #e8ebf2;
    --suave: #a1abbd;
    --linea: #2a3242;
    --sombra: 0 10px 30px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; font: 17px/1.6 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif; color: var(--tinta); background: var(--fondo); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--azul); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.15rem; }
.contenedor { width: min(1160px, 100% - 32px); margin-inline: auto; }
.angosto { width: min(820px, 100% - 32px); }
.saltar { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.saltar:focus { left: 8px; }

/* Barra superior */
.barra { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--panel) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--linea); }
.barra-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.marca { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: var(--tinta); text-decoration: none; }
.barra nav { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.barra nav a { color: var(--tinta); text-decoration: none; font-weight: 600; font-size: .95rem; }
.barra nav a:hover { color: var(--azul); }

/* Botones */
.boton { display: inline-block; background: var(--naranja); color: #1b1000 !important; font-weight: 800; padding: 12px 22px; border-radius: 12px; text-decoration: none; box-shadow: 0 6px 18px rgba(255, 152, 0, .35); transition: transform .15s ease; }
.boton:hover { transform: translateY(-1px); }
.boton.secundario { background: transparent; color: var(--tinta) !important; box-shadow: inset 0 0 0 2px var(--linea); }
.boton.chico { padding: 8px 14px; font-size: .9rem; box-shadow: none; }
.boton.grande { font-size: 1.1rem; padding: 14px 26px; }

/* Portada */
.hero { background: radial-gradient(1200px 500px at 85% -10%, rgba(255, 152, 0, .22), transparent 60%), radial-gradient(900px 400px at -10% 110%, rgba(47, 124, 255, .18), transparent 60%); padding: 56px 0 64px; }
.hero-in { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; align-items: center; }
.etiqueta { display: inline-block; margin: 0 0 12px; padding: 4px 12px; border-radius: 999px; background: var(--panel); border: 1px solid var(--linea); font-size: .85rem; font-weight: 700; color: var(--suave); }
.hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); letter-spacing: -.01em; }
.hero h1 span { color: var(--naranja-osc); }
@media (prefers-color-scheme: dark) { .hero h1 span { color: var(--naranja); } }
.bajada { font-size: 1.15rem; color: var(--suave); max-width: 36em; }
.acciones { display: flex; gap: 12px; flex-wrap: wrap; margin: 24px 0; }
.sellos { list-style: none; padding: 0; margin: 0; display: flex; gap: 10px 22px; flex-wrap: wrap; color: var(--suave); font-weight: 600; font-size: .95rem; }
.sellos li::before { content: "✓ "; color: var(--verde); font-weight: 900; }
.hero-imagen { margin: 0; }
.hero-imagen img { border-radius: 16px; box-shadow: var(--sombra); border: 1px solid var(--linea); }
.hero-imagen figcaption { text-align: center; color: var(--suave); font-size: .9rem; margin-top: 8px; }

/* Secciones */
.seccion { padding: 64px 0; }
.seccion.alterna { background: var(--panel); border-block: 1px solid var(--linea); }
.intro { color: var(--suave); font-size: 1.1rem; max-width: 46em; margin-bottom: 32px; }
.pasos { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.pasos li { background: var(--panel); border: 1px solid var(--linea); border-radius: 16px; padding: 22px; }
.num { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--marino); color: #fff; font-weight: 800; margin-bottom: 12px; }
@media (prefers-color-scheme: dark) { .num { background: var(--naranja); color: #1b1000; } }
.pasos p { color: var(--suave); margin: 0; }
.dos-col { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: center; }
.dos-col.invertida { grid-template-columns: 1.2fr 1fr; }
.dos-col.requisitos { grid-template-columns: 1fr 1fr; align-items: start; }
.captura { margin: 0; }
.captura img { border-radius: 14px; box-shadow: var(--sombra); border: 1px solid var(--linea); }
.lista-check { list-style: none; padding: 0; }
.lista-check li { position: relative; padding-left: 30px; margin-bottom: 10px; }
.lista-check li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 22px; height: 22px; border-radius: 50%; background: rgba(26, 154, 82, .14); color: var(--verde); font-weight: 900; display: grid; place-items: center; font-size: .8rem; }
.nota { background: color-mix(in srgb, var(--azul) 10%, transparent); border-radius: 12px; padding: 12px 16px; font-size: .95rem; }
.tarjetas { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 24px; }
.tarjetas article { background: var(--panel); border: 1px solid var(--linea); border-radius: 16px; padding: 22px; }
.tarjetas p { color: var(--suave); margin: 0; }
.galeria { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 20px; align-items: start; }
.galeria figure { margin: 0; }
.galeria img { border-radius: 12px; border: 1px solid var(--linea); box-shadow: var(--sombra); }
.galeria figcaption { color: var(--suave); font-size: .9rem; margin-top: 6px; text-align: center; }
.descarga { background: linear-gradient(135deg, var(--marino), #2b3d63); color: #fff; }
.descarga-in { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.descarga p { color: #d6dcea; font-size: 1.1rem; }
.requisitos ul { padding-left: 20px; }
.requisitos li { margin-bottom: 6px; }
details { background: var(--fondo); border: 1px solid var(--linea); border-radius: 12px; padding: 14px 18px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 700; }
details p { color: var(--suave); margin: 10px 0 0; }

/* Pie */
.pie { padding: 32px 0; border-top: 1px solid var(--linea); }
.pie-in { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between; }
.pie nav { display: flex; gap: 18px; flex-wrap: wrap; }
.pie p { width: 100%; margin: 0; color: var(--suave); font-size: .85rem; }

/* Página legal */
.legal { padding: 40px 0 64px; }
.legal article { background: var(--panel); border: 1px solid var(--linea); border-radius: 16px; padding: clamp(20px, 4vw, 44px); }
.legal h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); }
.legal h2 { font-size: 1.35rem; margin-top: 1.6em; }
.legal h3 { margin-top: 1.2em; }
.legal table { width: 100%; border-collapse: collapse; font-size: .95rem; display: block; overflow-x: auto; }
.legal th, .legal td { border: 1px solid var(--linea); padding: 8px 10px; text-align: left; vertical-align: top; }
.legal th { background: var(--fondo); }
.legal hr { border: 0; border-top: 1px solid var(--linea); margin: 24px 0; }
.legal code { background: var(--fondo); padding: 1px 6px; border-radius: 4px; }
.volver { display: inline-block; margin-bottom: 16px; font-weight: 600; }

@media (max-width: 960px) {
  .hero-in, .dos-col, .dos-col.invertida, .dos-col.requisitos { grid-template-columns: 1fr; gap: 28px; }
  .dos-col.invertida .captura { order: 2; }
  .pasos, .tarjetas { grid-template-columns: 1fr 1fr; }
  .galeria { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .barra nav a:not(.boton) { display: none; }
  .pasos, .tarjetas, .galeria { grid-template-columns: 1fr; }
  .hero { padding-top: 32px; }
  .seccion { padding: 44px 0; }
}