/* ==========================================================================
   AZTECH METAL RADIO — ENVÍA TU MÚSICA

   Landing + registro en cuatro pasos (27-sep-2026). Toma de suma.css la
   línea de la casa (tokens --sm-*, portada con pared de carteles, títulos,
   botones y pantallas); aquí va solo lo propio:

   · em-*  la landing: la escena "al aire", beneficios, la página de ejemplo,
           cómo funciona, lo que hay que tener a la mano y las preguntas.
   · env-* el formulario y el asistente. Las clases genéricas (.form-input,
           .form-group) las usa también el modal viejo en otras páginas: aquí
           van siempre acotadas a .env-form.
   ========================================================================== */

/* ================================================================ PORTADA */

/* La escena: la página de una banda y, encima, lo que se ve cuando suena. */
.em-escena { position: relative; height: clamp(440px, 44vw, 620px); perspective: 1800px; transform-style: preserve-3d; }
.em-escena::after { content: ""; position: absolute; inset: 12% 8%; z-index: 0; background: radial-gradient(closest-side, rgba(255, 59, 52, .32), transparent); filter: blur(30px); }

.em-escena-pagina {
  --alto: clamp(360px, 38vw, 540px);
  position: absolute; right: 0; top: 0; z-index: 2; width: 72%;
  transform: rotateY(-14deg) rotateX(4deg);
  animation: sm-cae 1.2s var(--sm-curva) backwards;
}
.em-escena-pagina .sm-pantalla-rollo img { animation: sm-rolla 26s ease-in-out infinite alternate; }

.em-alaire {
  position: absolute; left: 0; bottom: 9%; z-index: 5; width: min(400px, 74%);
  display: grid; grid-template-columns: 96px minmax(0, 1fr) auto; gap: 1rem; align-items: center;
  padding: 1rem 1.1rem 1.3rem 1rem;
  background: rgba(14, 11, 14, .94); border: 1px solid rgba(255, 255, 255, .16);
  box-shadow: 0 40px 80px -20px rgba(0, 0, 0, .95), 0 0 70px -20px rgba(255, 59, 52, .55);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  transform: translateZ(140px) rotateY(10deg);
  animation: em-entra 1.1s .35s var(--sm-curva) backwards;
}
.em-alaire::before { content: ""; position: absolute; left: -1px; right: -1px; top: -1px; height: 3px; background: var(--sm-rojo); }
.em-alaire-portada { width: 96px; height: 96px; object-fit: cover; box-shadow: 0 10px 30px rgba(0, 0, 0, .6); }
.em-alaire-txt { display: grid; gap: .22rem; min-width: 0; }
.em-alaire-tag {
  display: inline-flex; align-items: center; gap: .45rem;
  font: 700 .6rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .18em; text-transform: uppercase; color: var(--sm-rojo-luz);
}
.em-alaire-tag i { width: 7px; height: 7px; border-radius: 50%; background: var(--sm-rojo-luz); box-shadow: 0 0 0 0 rgba(255, 59, 52, .7); animation: sm-latido 1.8s infinite; }
.em-alaire-cancion { overflow: hidden; margin-top: .15rem; font: 400 clamp(1.5rem, 2.2vw, 2rem)/.95 var(--font-display); text-transform: uppercase; white-space: nowrap; text-overflow: ellipsis; color: #fff; }
.em-alaire-banda { font: 600 .95rem var(--font-body); color: #fff; }
.em-alaire-disco { font: 400 .78rem var(--font-body); color: var(--sm-hueso-3); }
/* El ecualizador: cinco barras que respiran a destiempo. */
.em-eq { align-self: end; display: flex; align-items: flex-end; gap: 3px; height: 28px; margin-bottom: .2rem; }
.em-eq i { width: 4px; height: 100%; background: var(--sm-rojo-luz); transform-origin: bottom; animation: em-eq .9s ease-in-out infinite alternate; }
.em-eq i:nth-child(2) { animation-duration: .7s; animation-delay: -.3s; }
.em-eq i:nth-child(3) { animation-duration: 1.1s; animation-delay: -.6s; }
.em-eq i:nth-child(4) { animation-duration: .8s; animation-delay: -.2s; }
.em-eq i:nth-child(5) { animation-duration: 1s; animation-delay: -.5s; }
.em-alaire-barra { position: absolute; left: 0; right: 0; bottom: 0; height: 3px; background: rgba(255, 255, 255, .1); }
.em-alaire-barra span { display: block; width: 100%; height: 100%; background: var(--sm-rojo-luz); transform-origin: left; animation: em-avance 40s linear infinite; }

.em-sello { left: 60%; bottom: -3%; }
.em-sello b { font-size: 2rem; }

@keyframes em-entra { from { opacity: 0; translate: 0 50px; } }
@keyframes em-eq { from { transform: scaleY(.18); } to { transform: scaleY(1); } }
@keyframes em-avance { from { transform: scaleX(.04); } to { transform: scaleX(1); } }

/* ============================================================ BENEFICIOS */

.em-benef { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; }
.em-benef-item {
  position: relative; padding: 2rem 1.6rem 2.2rem;
  background: linear-gradient(180deg, #130f13, #0b090c); border: 1px solid var(--sm-linea);
  transition: border-color .3s, transform .5s var(--sm-curva), opacity .8s var(--sm-curva);
}
.em-benef-item::before { content: ""; position: absolute; left: -1px; top: -1px; height: 3px; width: 0; background: var(--sm-rojo); transition: width .5s var(--sm-curva); }
.em-benef-item:hover { border-color: rgba(255, 59, 52, .45); transform: translateY(-4px); }
.em-benef-item:hover::before { width: calc(100% + 2px); }
.em-icono { display: grid; place-items: center; width: 54px; height: 54px; margin-bottom: 1.6rem; border: 1px solid rgba(255, 59, 52, .5); background: rgba(217, 31, 38, .1); }
.em-icono svg { width: 26px; height: 26px; fill: none; stroke: var(--sm-rojo-luz); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.em-benef-item h3 { margin: 0 0 .7rem; font: 400 clamp(1.6rem, 2.2vw, 2rem)/1 var(--font-display); text-transform: uppercase; color: #fff; }
.em-benef-item p { margin: 0; font: 400 .96rem/1.6 var(--font-body); color: var(--sm-hueso-2); }

/* ============================================================ LA PÁGINA */

.em-pagina-sec { border-block: 1px solid var(--sm-linea); background: linear-gradient(180deg, var(--sm-tinta), #0c0a0d); }
.em-split { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.em-lista { display: grid; gap: .85rem; margin: 1.8rem 0 2.2rem; padding: 0; list-style: none; }
.em-lista li { display: flex; align-items: center; gap: .75rem; font: 600 1.02rem var(--font-body); color: #fff; }
.em-lista svg, .em-kit svg { flex: none; fill: none; stroke: var(--sm-rojo-luz); stroke-linecap: round; stroke-linejoin: round; }
.em-lista svg { width: 18px; height: 18px; stroke-width: 3; }
.em-split-pantalla { text-decoration: none; }
.em-split-pantalla:hover { border-color: rgba(255, 59, 52, .6); }
.em-split-pantalla:focus-visible { outline: 2px solid var(--sm-rojo-luz); outline-offset: 4px; }

/* ========================================================= CÓMO FUNCIONA */

.em-pasos { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin: 0; padding: 0; list-style: none; }
.em-pasos li { position: relative; padding: 2rem 1.6rem 2.2rem; border-top: 2px solid var(--sm-rojo); background: rgba(255, 255, 255, .02); }
.em-paso-n { display: block; margin-bottom: 1.2rem; font: 400 clamp(4rem, 7vw, 6rem)/.8 var(--font-display); color: transparent; -webkit-text-stroke: 1.5px var(--sm-rojo-luz); }
.em-pasos h3 { margin: 0 0 .6rem; font: 400 clamp(1.7rem, 2.4vw, 2.2rem)/1 var(--font-display); text-transform: uppercase; color: #fff; }
.em-pasos p { margin: 0; font: 400 1rem/1.6 var(--font-body); color: var(--sm-hueso-2); }

.em-kit {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 2rem; align-items: center;
  margin-top: clamp(2.5rem, 5vw, 4rem); padding: clamp(1.4rem, 3vw, 2.2rem);
  border: 1px dashed rgba(255, 59, 52, .45);
  background: repeating-linear-gradient(135deg, rgba(217, 31, 38, .05) 0 14px, transparent 14px 28px);
}
.em-kit h3 { margin: 0; font: 400 clamp(1.8rem, 2.6vw, 2.4rem)/1 var(--font-display); text-transform: uppercase; color: #fff; }
.em-kit ul { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 1.2rem; margin: 0; padding: 0; list-style: none; }
.em-kit li { display: flex; align-items: flex-start; gap: .7rem; }
.em-kit svg { width: 24px; height: 24px; stroke-width: 1.8; }
.em-kit li span { display: grid; gap: .15rem; font: 400 .82rem/1.45 var(--font-body); color: var(--sm-hueso-3); }
.em-kit li b { font: 700 .9rem/1.3 var(--font-body); color: #fff; }

/* ============================================================== REGISTRO */

.em-registro {
  scroll-margin-top: 110px;
  border-top: 1px solid var(--sm-linea);
  background: radial-gradient(60% 40% at 50% 0%, rgba(217, 31, 38, .16), transparent 70%), #0b090c;
}
.em-registro-in { width: min(1000px, 100% - 2 * clamp(1rem, 4vw, 3rem)); margin: 0 auto; }
.em-registro-cab { text-align: center; }
.em-registro-cab .sm-nota { margin-inline: auto; }

.env-form {
  position: relative; padding: clamp(1.3rem, 3.4vw, 2.8rem);
  background: rgba(14, 11, 14, .94); border: 1px solid rgba(255, 255, 255, .14);
  box-shadow: 0 50px 100px -30px rgba(0, 0, 0, .95);
}
.env-form::before { content: ""; position: absolute; left: -1px; right: -1px; top: -1px; height: 4px; background: var(--sm-rojo); }

/* --------------------------------------------------------- el asistente */

.env-stepper {
  --avance: 0;
  position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0 0 clamp(1.8rem, 4vw, 2.8rem); padding: 0; list-style: none;
}
.env-stepper[hidden] { display: none; }
.env-stepper::before, .env-stepper::after { content: ""; position: absolute; top: 21px; left: 12.5%; height: 2px; }
.env-stepper::before { right: 12.5%; background: rgba(255, 255, 255, .12); }
.env-stepper::after { width: calc(75% * var(--avance)); background: var(--sm-rojo-luz); box-shadow: 0 0 14px rgba(255, 59, 52, .6); transition: width .6s var(--sm-curva); }
.env-stepper button {
  position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; gap: .7rem; width: 100%;
  padding: 0; border: 0; background: none; color: var(--sm-hueso-3); font: inherit; cursor: pointer;
}
.env-stepper b {
  display: grid; place-items: center; width: 44px; height: 44px;
  background: #0e0b0e; border: 1px solid rgba(255, 255, 255, .22);
  font: 400 1.35rem/1 var(--font-display); color: var(--sm-hueso-2);
  transition: background-color .3s, border-color .3s, color .3s, box-shadow .3s;
}
.env-stepper span { font: 700 .66rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .16em; text-align: center; text-transform: uppercase; }
.env-stepper button:hover b { border-color: var(--sm-rojo-luz); }
.env-stepper button:focus-visible { outline: 2px solid var(--sm-rojo-luz); outline-offset: 4px; }
.env-stepper [data-estado="hecho"] b { border-color: var(--sm-rojo-luz); color: var(--sm-rojo-luz); }
.env-stepper [data-estado="hecho"] span { color: var(--sm-hueso-2); }
.env-stepper [data-estado="actual"] b {
  background: var(--sm-rojo); border-color: var(--sm-rojo); color: #fff;
  box-shadow: 0 0 0 5px rgba(217, 31, 38, .22), 0 10px 30px -8px rgba(255, 59, 52, .8);
}
.env-stepper [data-estado="actual"] span { color: #fff; }

.env-paso[hidden] { display: none; }
.env-con-pasos .env-paso { animation: em-paso .5s var(--sm-curva); }
/* Sin JavaScript se ven los cuatro seguidos. */
.env-form:not(.env-con-pasos) .env-paso + .env-paso { margin-top: 3rem; padding-top: 3rem; border-top: 1px solid var(--sm-linea); }
@keyframes em-paso { from { opacity: 0; transform: translateX(24px); } }

.env-paso-cab { margin-bottom: 1.8rem; padding-bottom: 1.4rem; border-bottom: 1px solid var(--sm-linea); }
.env-paso-num { font: 700 .68rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .2em; text-transform: uppercase; color: var(--sm-rojo-luz); }
.env-paso-cab h3 { margin: .5rem 0 .45rem; font: 400 clamp(2.2rem, 4vw, 3.2rem)/.9 var(--font-display); text-transform: uppercase; color: #fff; }
.env-paso-cab p { margin: 0; font: 400 1rem/1.6 var(--font-body); color: var(--sm-hueso-2); }

.env-sub {
  display: flex; align-items: center; gap: .9rem; margin: 1.2rem 0 1.3rem;
  font: 700 .7rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .2em; text-transform: uppercase; color: var(--sm-hueso-2);
}
.env-sub::after { content: ""; flex: 1; height: 1px; background: var(--sm-linea); }
.env-o {
  display: flex; align-items: center; gap: 1rem; margin: .2rem 0 1.4rem;
  font: 700 .66rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .2em; text-transform: uppercase; color: var(--sm-hueso-3);
}
.env-o::before, .env-o::after { content: ""; flex: 1; height: 1px; background: var(--sm-linea); }
.env-nota { margin: 0 0 1.6rem; padding: .9rem 1.1rem; border-left: 3px solid var(--sm-rojo-luz); background: rgba(217, 31, 38, .08); font: 400 .96rem/1.6 var(--font-body); color: var(--sm-hueso); }
.env-doc { padding: 1.2rem 1.2rem .2rem; border: 1px solid var(--sm-linea); background: rgba(255, 255, 255, .02); }

/* ---------------------------------------------------------------- campos */

.env-form .form-group { margin-bottom: 1.4rem; }
.env-form .form-label {
  display: block; margin-bottom: .5rem;
  font: 700 .7rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .14em; text-transform: uppercase; color: var(--sm-hueso-2);
}
.env-req { color: var(--sm-rojo-luz); }
.env-form .form-input {
  width: 100%; padding: .9rem 1rem;
  background: rgba(0, 0, 0, .45); border: 1px solid rgba(255, 255, 255, .16); border-radius: 0;
  color: #fff; font: 400 1rem/1.5 var(--font-body);
  transition: border-color .2s, box-shadow .2s, background-color .2s;
}
.env-form .form-input::placeholder { color: rgba(240, 235, 227, .3); }
.env-form .form-input:focus { outline: none; border-color: var(--sm-rojo-luz); box-shadow: 0 0 0 3px rgba(255, 59, 52, .2); }
.env-form select.form-input {
  appearance: none; cursor: pointer; padding-right: 2.8rem;
  background: rgba(0, 0, 0, .45) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FF3B34' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 1rem center / 16px;
}
.env-form option { background: #0B0405; color: #fff; }
.env-area { min-height: 5rem; resize: vertical; }
.env-ayuda { margin: .45rem 0 0; font: 400 .82rem/1.55 var(--font-body); color: var(--sm-hueso-3); }

/* Campo mal llenado: borde rojo y un renglón que dice qué arreglar. */
.env-form .form-input.env-malo { border-color: var(--sm-rojo-luz); background-color: rgba(255, 59, 52, .07); }
.env-error { margin: .45rem 0 0; font: 600 .82rem/1.5 var(--font-body); color: var(--neon-crimson-bright, #FF6157); }

.env-rejilla { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 1.2rem; }

/* Los archivos: una zona punteada con el botón en rojo. */
.env-archivo {
  padding: 1rem; cursor: pointer; color: var(--sm-hueso-2); font-size: .92rem;
  border-style: dashed !important; border-color: rgba(255, 255, 255, .24) !important; background: rgba(255, 255, 255, .02) !important;
}
.env-archivo:hover { border-color: rgba(255, 59, 52, .6) !important; background: rgba(217, 31, 38, .05) !important; }
.env-archivo::file-selector-button {
  margin-right: 1rem; padding: .7rem 1.1rem; border: 0; cursor: pointer;
  font: 700 .7rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .14em; text-transform: uppercase;
  color: #fff; background: var(--sm-rojo); transition: background-color .2s;
}
.env-archivo:hover::file-selector-button { background: var(--red-fill-hover, #F0272F); }
.env-archivo--musica { padding-block: 1.5rem; }

/* ---------------------------------------------------------------- discos */

.env-disco {
  margin-bottom: 1.2rem; padding: clamp(1.1rem, 3vw, 1.8rem);
  border: 1px solid var(--sm-linea); border-left: 3px solid var(--sm-rojo); background: rgba(0, 0, 0, .35);
}
.env-disco-cab { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.2rem; }
.env-disco-cab h3 { margin: 0; font: 400 1.9rem/1 var(--font-display); text-transform: uppercase; color: #fff; }
.env-quitar {
  padding: .5rem .8rem; border: 1px solid var(--sm-linea); background: none; cursor: pointer;
  font: 700 .64rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .14em; text-transform: uppercase; color: var(--sm-hueso-3);
  transition: color .2s, border-color .2s;
}
.env-quitar:hover { color: var(--sm-rojo-luz); border-color: var(--sm-rojo-luz); }
.env-quitar[hidden], .env-agregar[hidden] { display: none; }
.env-agregar {
  display: flex; align-items: center; justify-content: center; gap: .6rem; width: 100%; min-height: 60px; padding: 1rem;
  border: 1px dashed rgba(255, 59, 52, .5); background: transparent; cursor: pointer;
  font: 700 .74rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .16em; text-transform: uppercase; color: var(--sm-rojo-luz);
  transition: background-color .2s, border-color .2s;
}
.env-agregar:hover { background: rgba(217, 31, 38, .08); border-color: var(--sm-rojo-luz); }
.env-agregar span { font-size: 1.2rem; line-height: 1; }
.env-quitar:focus-visible, .env-agregar:focus-visible { outline: 2px solid var(--sm-rojo-luz); outline-offset: 3px; }

/* Una fila por canción: número, título editable y cuánto pesa. */
.env-pistas { display: flex; flex-direction: column; gap: .45rem; margin: .8rem 0 0; padding: 0; list-style: none; }
.env-pista { display: grid; grid-template-columns: 2rem 1fr auto; align-items: center; gap: .6rem; }
.env-pista-num { font: 400 1.1rem var(--font-display); text-align: right; color: var(--sm-rojo-luz); }
.env-form .env-pista-titulo { padding: .6rem .75rem; font-size: .95rem; }
.env-pista-peso { font: 600 .72rem var(--font-data, 'Barlow', sans-serif); white-space: nowrap; color: var(--sm-hueso-3); }

/* ---------------------------------------------------------- autorización */

.env-legal { margin-bottom: 1.4rem; padding: 1.4rem 1.5rem; border: 1px solid var(--sm-linea); background: rgba(0, 0, 0, .35); }
.env-legal p { margin: 0 0 .9rem; font: 400 .92rem/1.75 var(--font-body); color: var(--sm-hueso-2); }
.env-legal p:last-child { margin-bottom: 0; }
.env-legal strong { color: #fff; }
.env-check {
  display: flex; align-items: flex-start; gap: .75rem; margin-bottom: 1.8rem; padding: 1rem 1.1rem;
  border: 1px solid rgba(255, 59, 52, .55); background: rgba(217, 31, 38, .08);
}
.env-check input[type="checkbox"] { flex-shrink: 0; width: 1.2rem; height: 1.2rem; margin-top: .12rem; accent-color: var(--sm-rojo); cursor: pointer; }
.env-check .checkbox-label { font: 600 .96rem/1.6 var(--font-body); color: #fff; cursor: pointer; }

/* ---------------------------------------------------- navegación y envío */

.env-enviar { margin-top: 2rem; padding-top: 1.6rem; border-top: 1px solid var(--sm-linea); }
.env-nav { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; }
.env-nav .sm-btn[hidden] { display: none; }
.env-atras { background: transparent; }   /* un <button> trae fondo gris del navegador */
/* Al moverse a un paso, que la cabecera fija no tape el índice. */
.env-form, .env-stepper { scroll-margin-top: 130px; }
.env-seguir, .env-boton { margin-left: auto; min-width: 220px; }
.env-boton:disabled, .env-seguir:disabled { opacity: .6; cursor: wait; transform: none; }
.env-aviso { min-height: 1.3rem; margin: 1rem 0 0; font: 500 .92rem/1.6 var(--font-body); color: var(--sm-hueso-2); }
.env-aviso:empty { margin: 0; min-height: 0; }
.env-aviso[data-estado="ok"] { color: #7BD88F; }
.env-aviso[data-estado="error"] { color: var(--neon-crimson-bright, #FF6157); }
.env-progreso { height: 6px; margin-top: .9rem; overflow: hidden; background: rgba(255, 255, 255, .08); }
.env-progreso-barra { width: 0; height: 100%; background: var(--sm-rojo-luz); box-shadow: 0 0 12px rgba(255, 59, 52, .7); transition: width .25s linear; }

/* Al terminar: solo la confirmación. */
.env-form[data-listo] .env-paso, .env-form[data-listo] .env-stepper { display: none; }
.env-form[data-listo] .env-enviar { margin: 0; padding: 0; border: 0; }
.env-gracias { padding: clamp(1.6rem, 5vw, 3.2rem) .5rem; text-align: center; }
.env-gracias-marca {
  display: grid; place-items: center; width: 72px; height: 72px; margin: 0 auto 1.4rem;
  background: var(--sm-rojo); box-shadow: 0 0 0 8px rgba(217, 31, 38, .2), 0 20px 50px -10px rgba(255, 59, 52, .8);
}
.env-gracias-marca svg { width: 36px; height: 36px; fill: none; stroke: #fff; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.env-gracias h2 { margin: 0 0 1rem; font: 400 clamp(2.6rem, 6vw, 4rem)/.9 var(--font-display); text-transform: uppercase; color: #fff; }
.env-gracias-folio { font: 700 .74rem var(--font-data, 'Barlow', sans-serif); letter-spacing: .2em; text-transform: uppercase; color: var(--sm-hueso-2); }
.env-gracias-folio strong { display: block; margin-top: .4rem; font: 400 clamp(2rem, 5vw, 3rem)/1 var(--font-display); letter-spacing: .04em; color: var(--sm-rojo-luz); }
.env-gracias p { max-width: 54ch; margin: 0 auto 1.2rem; font: 400 1rem/1.7 var(--font-body); color: var(--sm-hueso-2); }
.env-gracias .sm-btn { margin-top: .6rem; }

/* ------------------------------------------------- convocatoria cerrada */

.env-cerrado { max-width: 820px; margin: 0 auto 2.5rem; padding: 2rem; border: 1px solid var(--sm-rojo-luz); background: rgba(217, 31, 38, .1); text-align: center; }
.env-cerrado h2 { margin-bottom: .9rem; font: 400 2rem var(--font-display); text-transform: uppercase; }
.env-cerrado p { max-width: 56ch; margin: 0 auto .8rem; font: 400 .95rem/1.7 var(--font-body); color: var(--sm-hueso-2); }
/* El formulario sigue visible a propósito: sirve de lista de requisitos. */
.env-form-cerrado { opacity: .82; }

/* ============================================================== PREGUNTAS */

.em-faq-in { width: min(980px, 100% - 2 * clamp(1rem, 4vw, 3rem)); }
.em-faq { border-top: 1px solid var(--sm-linea); }
.em-faq details { border-bottom: 1px solid var(--sm-linea); }
.em-faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.4rem 0;
  list-style: none; cursor: pointer;
  font: 400 clamp(1.35rem, 2.2vw, 1.8rem)/1.05 var(--font-display); text-transform: uppercase; color: #fff;
  transition: color .2s;
}
.em-faq summary::-webkit-details-marker { display: none; }
.em-faq summary::after { content: "+"; flex: none; font: 400 2rem/1 var(--font-display); color: var(--sm-rojo-luz); transition: transform .3s var(--sm-curva); }
.em-faq details[open] summary::after { transform: rotate(45deg); }
.em-faq summary:hover { color: var(--sm-rojo-luz); }
.em-faq summary:focus-visible { outline: 2px solid var(--sm-rojo-luz); outline-offset: 4px; }
.em-faq p { max-width: 62ch; margin: 0 0 1.5rem; font: 400 1rem/1.65 var(--font-body); color: var(--sm-hueso-2); }

/* ================================================================ MOVIMIENTO */

@media (prefers-reduced-motion: reduce) {
  .em-escena-pagina, .em-escena-pagina .sm-pantalla-rollo img, .em-alaire, .em-alaire-tag i,
  .em-eq i, .em-alaire-barra span, .env-con-pasos .env-paso { animation: none !important; }
  .em-eq i { transform: scaleY(.6); }
  .env-stepper::after { transition: none; }
}

/* ================================================================== TABLETA */

@media (max-width: 1100px) {
  .em-escena { height: clamp(380px, 62vw, 560px); width: 100%; max-width: 760px; margin: 0 auto; }
  /* Plano: adelantado en 3D, la perspectiva lo agranda y lo empuja fuera del borde. */
  .em-escena { transform-style: flat; }
  .em-sello { left: auto; right: 1%; bottom: auto; top: 42%; width: 120px; transform: none; }
  .em-alaire { left: 2%; transform: translateZ(60px); }
  .em-sello b { font-size: 1.6rem; }
  .em-benef { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .em-split { grid-template-columns: minmax(0, 1fr); }
  .em-kit { grid-template-columns: minmax(0, 1fr); gap: 1.4rem; }
  .em-kit ul { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ================================================================= TELÉFONO */

@media (max-width: 700px) {
  .em-escena { height: 96vw; margin-top: .5rem; }
  .em-escena-pagina { --alto: 76vw; width: 78%; }
  .em-alaire { left: 3%; bottom: 4%; width: 90%; grid-template-columns: 64px minmax(0, 1fr) auto; gap: .7rem; padding: .75rem .8rem 1rem .75rem; transform: translateZ(60px); }
  .em-alaire-tag { overflow: hidden; font-size: .54rem; letter-spacing: .12em; white-space: nowrap; }
  .em-alaire-portada { width: 64px; height: 64px; }
  .em-alaire-cancion { font-size: 1.35rem; }
  .em-sello { left: auto; right: 0; bottom: auto; top: 40%; width: 92px; }
  .em-sello b { font-size: 1.3rem; }
  .em-benef, .em-pasos { grid-template-columns: minmax(0, 1fr); }
  .em-kit ul { grid-template-columns: minmax(0, 1fr); gap: .9rem; }

  .env-stepper b { width: 38px; height: 38px; font-size: 1.15rem; }
  .env-stepper::before, .env-stepper::after { top: 18px; }
  .env-stepper span { font-size: .56rem; letter-spacing: .08em; }
  .env-nav { flex-direction: column-reverse; align-items: stretch; }
  .env-seguir, .env-boton { width: 100%; min-width: 0; margin-left: 0; }
  .env-atras { width: 100%; }
  .env-rejilla { grid-template-columns: minmax(0, 1fr); }
  .env-pista { grid-template-columns: 1.6rem 1fr; }
  .env-pista-peso { grid-column: 2; }
  .env-archivo::file-selector-button { display: block; margin: 0 0 .6rem; }
}