/* =========================================================================
   Arletex Design System v3.5 — Blog: ¿Cómo Hacer Bolsas De Tela?
   (/blog/como-hacer-bolsas-de-tela) · Prefijo: bt- / --bt-*
   ─────────────────────────────────────────────────────────────────────────
   FIRMA PROPIA DE ESTE BLOG: "EL TALLER DE COSTURA".
   La página se lee como la mesa de trabajo de un taller: líneas de
   puntada (dashed stitch) como reglas, un MOLDE DE CORTE con cotas en
   mono (la pieza espectacular), telemetría de taller (tiempo, nivel,
   piezas) y el hilo punteado que conecta los 8 pasos. El purple marca
   la voz "blog/tutorial"; orange sigue siendo el CTA.
   Se conserva TODO el SEO del original (meta, headings, keywords,
   enlaces internos/externos e imágenes). ≥55% blanco.

   Chrome legacy: el slide superior (.slider-nav) y el breadcrumb
   bootstrap se conservan FUERA de .bt-page, homogéneos con el sitio.

   Mapa de secciones (registro · apertura · marco · fondo · hover):
     01 Apertura        Manifiesto · ManifestoClaim  · —          · paper · —
     02 Intro           Periódico  · RunInHeadline   · Side-rule  · white · rule-draw
     03 Kit / materiales Galería   · IndexRow        · Top-rule   · white · lift
     04 Molde de corte  Técnico    · LabelLateral    · Side-rule  · cream · —
     05 Procedimiento   Periódico  · NumberProtag    · Index-tab  · white · side-shift
     06 Fiubags hechas  Fanzine    · QuoteOpener     · Double     · cream · lift + press
     07 Tabla telas/usos Almanaque · IndexRow        · Index-tab  · paper · ink-flood chips
     08 Beneficios (inc) —         · —               · tight      · white · —
     09 Video tutorial  Galería    · RunInHeadline   · Double     · INK   · rule-draw
     10 Youtube (inc)   —          · —               · tight      · white · —
     11 Telas p/ bolsas Dossier    · Dossier         · Top-rule   · white · lift
     12 Cosmetiqueras   Vitrina    · Dossier pill    · Full-frame · white · lift + press
     13 Usos/Beneficios —          · Vertical split  · —          · paper/INK · rule-draw
     14 Ambiental       Periódico  · DropCap         · Marginalia · white · —
     15 CTA final       Manifiesto-CTA · MegaTextBg  · Bleed      · INK   · press
     16 FAQ             Dossier    · RunInHeadline   · Top-rule   · white · side-shift
     17 Comentarios(inc) —         · —               · tight      · white · —
   ========================================================================= */

/* ─── Tokens locales (fallback a --ax-* global) ────────────────────────── */
.bt-page {
    --bt-ink:          var(--ax-ink, #1F2530);
    --bt-paper:        var(--ax-paper, #FAF6EE);
    --bt-cream:        var(--ax-cream, #F2EDE4);
    --bt-white:        var(--ax-white, #FFFFFF);
    --bt-orange:       var(--ax-orange, #F15A29);
    --bt-orange-deep:  var(--ax-orange-deep, #B0401A);
    --bt-purple:       var(--ax-purple, #6A52A2);
    --bt-purple-deep:  #4E3B7E;
    --bt-yellow:       var(--ax-yellow, #FFEB3B);
    --bt-muted:        var(--ax-muted, #6E6A60);
    --bt-muted-dark:   var(--ax-muted-dark, #A8A39A);
    --bt-whatsapp:     var(--ax-whatsapp, #25D366);
    --bt-whatsapp-deep:#128C4A;
    --bt-rule:         rgba(31, 37, 48, 0.16);
    --bt-rule-on-dark: rgba(250, 246, 238, 0.18);
    --bt-font-display: var(--ax-font-display, 'Anton', 'Arial Narrow', sans-serif);
    --bt-font-accent:  var(--ax-font-accent, 'Fraunces', Georgia, serif);
    --bt-font-body:    var(--ax-font-body, 'Lato', system-ui, sans-serif);
    --bt-font-mono:    var(--ax-font-mono, 'JetBrains Mono', ui-monospace, 'Courier New', monospace);
    --bt-motion-fast:  140ms;
    --bt-motion-base:  220ms;
    --bt-motion-slow:  360ms;
    --bt-ease-out:     cubic-bezier(.22, 1, .36, 1);
    /* Firma del taller: línea de puntada (stitch) horizontal y vertical */
    --bt-stitch-h: repeating-linear-gradient(90deg,
        var(--bt-ink) 0 10px, transparent 10px 18px);
    --bt-stitch-v: repeating-linear-gradient(180deg,
        var(--bt-ink) 0 10px, transparent 10px 18px);
    --bt-stitch-h-orange: repeating-linear-gradient(90deg,
        var(--bt-orange) 0 10px, transparent 10px 18px);
    background: var(--bt-white);
    color: var(--bt-ink);
    font-family: var(--bt-font-body);
    font-size: 16px;
    line-height: 1.65;
    overflow-x: hidden;   /* seguro anti-hueco lateral (bursts/mega-text) */
}
.bt-page *, .bt-page *::before, .bt-page *::after { box-sizing: border-box; }

.bt-section[id] { scroll-margin-top: 116px; }

/* ─── Container ────────────────────────────────────────────────────────── */
.bt-container {
    max-width: 1380px;
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 56px);
}
.bt-container--narrow { max-width: 900px; }
.bt-container--wide   { max-width: 1600px; }

/* ─── Sections: fondos, paddings, marcos ───────────────────────────────── */
.bt-section          { padding: clamp(64px, 8vw, 96px) 0; background: var(--bt-white); }
.bt-section--tight   { padding: 32px 0; }
.bt-section--paper   { background: var(--bt-paper); }
.bt-section--cream   { background: var(--bt-cream); }
.bt-section--ink     { background: var(--bt-ink); color: var(--bt-paper); }

.bt-section--top-rule    { border-top: 2px solid var(--bt-orange); }
.bt-section--double-rule { border-top: 1px solid var(--bt-ink); border-bottom: 1px solid var(--bt-ink); }
.bt-section--ink.bt-section--double-rule {
    border-top-color: var(--bt-orange);
    border-bottom-color: var(--bt-orange);
}
.bt-section--side-rule { border-left: 3px solid var(--bt-purple); }

/* Index-tab: pestaña de archivador sobre el rule superior */
.bt-section--index-tab { position: relative; border-top: 2px solid var(--bt-ink); }
.bt-section--index-tab .bt-tab {
    position: absolute;
    top: 0;
    left: clamp(20px, 4vw, 56px);
    transform: translateY(-100%);
    background: var(--bt-ink);
    color: var(--bt-paper);
    font-family: var(--bt-font-mono);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    padding: 6px 14px;
}

/* ─── Tipografía base ──────────────────────────────────────────────────── */
.bt-display {
    font-family: var(--bt-font-display);
    font-weight: 400;
    text-transform: uppercase;
    line-height: .95;
    letter-spacing: .01em;
    margin: 0;
    color: inherit;
}
.bt-display--xl {
    font-size: clamp(2.9rem, 8.5vw, 6.5rem);
    line-height: .88;
    letter-spacing: -0.01em;
}
.bt-display--lg { font-size: clamp(2rem, 4.5vw, 3.4rem); }
.bt-display--md { font-size: clamp(1.5rem, 3vw, 2.25rem); }
.bt-display--sm { font-size: clamp(1.15rem, 2vw, 1.5rem); }

.bt-display em,
.bt-em {
    font-family: var(--bt-font-accent);
    font-style: italic;
    font-weight: 400;
    text-transform: lowercase;
    letter-spacing: -0.025em;
    color: var(--bt-orange);
}

.bt-body { font-size: clamp(1rem, 1.15vw, 1.0625rem); margin: 0 0 1.1rem; }
.bt-body:last-child { margin-bottom: 0; }
.bt-body strong { font-weight: 700; }

/* Links dentro de prosa: rule-draw (subrayado que se traza) */
.bt-link {
    color: var(--bt-ink);
    text-decoration: none;
    font-weight: 700;
    background-image: linear-gradient(var(--bt-orange) 0 0);
    background-repeat: no-repeat;
    background-position: left bottom;
    background-size: 0% 2px;
    padding-bottom: 2px;
    transition: background-size var(--bt-motion-base) var(--bt-ease-out);
    box-shadow: inset 0 -2px 0 var(--bt-rule);   /* subrayado base tenue */
}
.bt-link:hover,
.bt-link:focus-visible { background-size: 100% 2px; color: var(--bt-ink); text-decoration: none; }
.bt-section--ink .bt-link { color: var(--bt-paper); box-shadow: inset 0 -2px 0 var(--bt-rule-on-dark); }
.bt-section--ink .bt-link:hover,
.bt-section--ink .bt-link:focus-visible { color: var(--bt-paper); }

.bt-mono {
    font-family: var(--bt-font-mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
}

/* Eyebrow-stamp (sello editorial). data-stamp pinta la viñeta izquierda */
.bt-stamp {
    display: inline-flex;
    align-items: stretch;
    margin: 0 0 clamp(.9rem, 2vw, 1.25rem);
    border: 1.5px solid var(--bt-ink);
    font-family: var(--bt-font-mono);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
}
.bt-stamp::before {
    content: attr(data-stamp);
    display: inline-flex;
    align-items: center;
    background: var(--bt-purple);
    color: var(--bt-white);
    padding: 5px 10px;
    font-weight: 700;
}
.bt-stamp > span { display: inline-flex; align-items: center; padding: 5px 10px; background: var(--bt-white); color: var(--bt-ink); }
.bt-stamp--orange::before { background: var(--bt-orange); color: var(--bt-ink); }
.bt-section--ink .bt-stamp { border-color: var(--bt-paper); }

/* ─── Firma: regla de puntada con tijera (línea de corte) ─────────────── */
.bt-cutline {
    position: relative;
    height: 2px;
    background-image: var(--bt-stitch-h);
    background-size: 100% 2px;
    background-repeat: no-repeat;
    margin: clamp(1.5rem, 3vw, 2.5rem) 0;
}
.bt-cutline::before {
    content: "✂";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-54%) rotate(180deg);   /* la tijera "avanza" cortando */
    background: inherit;
    background-image: none;
    font-size: 1.15rem;
    line-height: 1;
    color: var(--bt-ink);
    padding-right: 6px;
}
.bt-cutline--paper::before { background: var(--bt-paper); }
.bt-cutline--white::before { background: var(--bt-white); }

/* ─── Botones ──────────────────────────────────────────────────────────── */
.bt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5em;
    font-family: var(--bt-font-body);
    font-weight: 800;
    font-size: clamp(.95rem, 1.1vw, 1.05rem);
    letter-spacing: .02em;
    text-transform: uppercase;
    text-decoration: none;
    padding: 15px 28px;
    border: 2px solid transparent;
    cursor: pointer;
    transition:
        transform var(--bt-motion-fast) var(--bt-ease-out),
        box-shadow var(--bt-motion-fast) var(--bt-ease-out),
        background-color var(--bt-motion-base) var(--bt-ease-out),
        color var(--bt-motion-base) var(--bt-ease-out);
}
.bt-btn:hover { text-decoration: none; }

/* press-chunky */
.bt-btn--primary {
    background: var(--bt-orange);
    color: var(--bt-white);
    box-shadow: 0 6px 0 var(--bt-orange-deep);
}
.bt-btn--primary:hover        { color: var(--bt-white); transform: translateY(-2px); box-shadow: 0 8px 0 var(--bt-orange-deep); }
.bt-btn--primary:active       { transform: translateY(2px); box-shadow: 0 0 0 var(--bt-orange-deep); }

.bt-btn--whatsapp {
    background: var(--bt-whatsapp);
    color: var(--bt-ink);
    box-shadow: 0 6px 0 var(--bt-whatsapp-deep);
}
.bt-btn--whatsapp:hover  { color: var(--bt-ink); transform: translateY(-2px); box-shadow: 0 8px 0 var(--bt-whatsapp-deep); }
.bt-btn--whatsapp:active { transform: translateY(2px); box-shadow: 0 0 0 var(--bt-whatsapp-deep); }

/* ghost-fill (sobre dark) */
.bt-btn--ghost {
    background: transparent;
    color: var(--bt-paper);
    border-color: var(--bt-paper);
}
.bt-btn--ghost:hover  { background: var(--bt-orange); border-color: var(--bt-orange); color: var(--bt-ink); }
.bt-btn--ghost:active { background: var(--bt-orange-deep); color: var(--bt-paper); }

/* ─── Hover helpers ────────────────────────────────────────────────────── */
.bt-lift {
    transition:
        transform var(--bt-motion-base) var(--bt-ease-out),
        box-shadow var(--bt-motion-base) var(--bt-ease-out);
}
.bt-lift:hover  { transform: translate(-3px, -3px); box-shadow: 5px 5px 0 var(--bt-orange); }
.bt-lift:active { transform: translate(-1px, -1px); }

/* =========================================================================
   01 · APERTURA — Manifiesto: el taller abre
   (el slide y el breadcrumb legacy viven fuera de .bt-page)
   ========================================================================= */
.bt-hero__head { max-width: 1000px; }
.bt-hero__title { margin: 0 0 clamp(.75rem, 2vw, 1.25rem); }
.bt-hero__lede {
    font-family: var(--bt-font-accent);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1.25rem, 2.4vw, 1.9rem);
    line-height: 1.3;
    color: var(--bt-muted);
    margin: 0 0 clamp(1.25rem, 2.5vw, 2rem);
    max-width: 32ch;
    text-transform: none;
}
.bt-hero__intro { max-width: 62ch; }

/* Telemetría de taller: la etiqueta cosida al hero */
.bt-hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem 2rem;
    list-style: none;
    margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
    padding: clamp(.8rem, 1.5vw, 1rem) 0;
    border-top: 2px solid var(--bt-ink);
    background-image: var(--bt-stitch-h);
    background-repeat: no-repeat;
    background-position: left bottom;
    background-size: 100% 2px;
    font-family: var(--bt-font-mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--bt-muted);
}
.bt-hero__meta strong { color: var(--bt-ink); font-weight: 700; }

/* =========================================================================
   02 · INTRO — Periódico: RunInHeadline + prosa
   ========================================================================= */
.bt-runin {
    display: flex;
    align-items: center;
    gap: clamp(.5rem, 1.5vw, 1rem);
    flex-wrap: wrap;
    margin: 0 0 clamp(1.5rem, 3vw, 2.5rem);
    padding-bottom: clamp(.75rem, 1.5vw, 1rem);
    border-bottom: 1px solid var(--bt-rule);
}
.bt-runin .bt-stamp { margin: 0; }
.bt-runin__divider {
    font-family: var(--bt-font-accent);
    font-style: italic;
    color: var(--bt-orange);
    font-size: 1.5em;
    flex-shrink: 0;
}
.bt-runin__title { margin: 0; }
.bt-section--ink .bt-runin { border-bottom-color: var(--bt-rule-on-dark); }

.bt-intro__prose { max-width: 68ch; }

/* Ornamenta como colofón editorial */
.bt-ornament { text-align: center; margin: clamp(1.5rem, 3vw, 2.5rem) auto 0; }
.bt-ornament img { width: min(320px, 60%); height: auto; }

/* =========================================================================
   03 · KIT DE COSTURA — contact-sheet de materiales
   ========================================================================= */
.bt-index-head {
    display: flex;
    align-items: baseline;
    gap: .75rem;
    margin: 0 0 clamp(1.5rem, 3vw, 2.5rem);
    padding-bottom: clamp(.75rem, 1.5vw, 1rem);
    border-bottom: 2px solid var(--bt-ink);
}
.bt-index-head__title { margin: 0; }
.bt-index-head__leader {
    flex: 1 1 auto;
    align-self: flex-end;
    margin-bottom: .35em;
    border-bottom: 3px dotted var(--bt-rule);
}
.bt-index-head__tally { flex: 0 0 auto; color: var(--bt-muted); white-space: nowrap; }
.bt-section--ink .bt-index-head { border-bottom-color: var(--bt-paper); }

/* 6 herramientas en retícula + la tela como celda protagonista a lo
   ancho (acento --wide del contact-sheet): la fila siempre cierra. */
.bt-kit {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(10px, 1.4vw, 18px);
}
@media (min-width: 720px)  { .bt-kit { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1100px) { .bt-kit { grid-template-columns: repeat(6, 1fr); } }
.bt-kit__cell {
    margin: 0;
    border: 1.5px solid var(--bt-ink);
    background: var(--bt-white);
    display: flex;
    flex-direction: column;
}
.bt-kit__media {
    display: grid;
    place-items: center;
    aspect-ratio: 1;
    padding: clamp(14px, 2vw, 22px);
    border-bottom: 1.5px dashed var(--bt-ink);   /* costura entre foto y etiqueta */
    background:
        linear-gradient(var(--bt-rule) 1px, transparent 1px) 0 0 / 100% 22px,  /* papel de patrón */
        var(--bt-white);
}
.bt-kit__media img { max-width: 70%; height: auto; }
.bt-kit__cell figcaption {
    padding: 8px 10px;
    font-family: var(--bt-font-mono);
    font-size: .68rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--bt-muted);
}
.bt-kit__cell figcaption strong { color: var(--bt-ink); display: block; font-weight: 700; }

/* Celda protagonista: la tela ocupa toda la fila, en horizontal */
.bt-kit__cell--tela { grid-column: 1 / -1; flex-direction: row; align-items: stretch; }
.bt-kit__cell--tela .bt-kit__media {
    aspect-ratio: auto;
    width: clamp(110px, 18vw, 170px);
    flex: 0 0 auto;
    border-bottom: 0;
    border-right: 1.5px dashed var(--bt-ink);
}
.bt-kit__cell--tela .bt-kit__media img { max-width: 58%; }
.bt-kit__cell--tela figcaption {
    align-self: center;
    padding: 14px clamp(14px, 2.5vw, 24px);
    font-size: .78rem;
}
.bt-kit__cell--tela figcaption strong {
    font-family: var(--bt-font-display);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: .03em;
    font-size: clamp(1rem, 1.8vw, 1.35rem);
    margin-bottom: .2rem;
}

/* =========================================================================
   04 · MOLDE DE CORTE — la pieza técnica firmada
   ========================================================================= */
.bt-lateral {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: clamp(1rem, 3vw, 2.5rem);
    align-items: start;
    margin: 0 0 clamp(2rem, 4vw, 3rem);
    padding-top: clamp(1rem, 2vw, 1.5rem);
    border-top: 2px solid var(--bt-orange);
}
.bt-lateral__rail {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    padding-right: clamp(.5rem, 1vw, 1rem);
}
.bt-lateral__rail .bt-mono { color: var(--bt-muted); letter-spacing: .3em; }
.bt-lateral__title { margin: 0 0 .5rem; }
.bt-lateral__note { max-width: 60ch; color: var(--bt-muted); margin: 0; }

.bt-molde {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(24px, 5vw, 64px);
    align-items: start;
}

/* Lienzo del molde: papel de patrón cuadriculado */
.bt-molde__canvas {
    background:
        linear-gradient(var(--bt-rule) 1px, transparent 1px) 0 0 / 100% 28px,
        linear-gradient(90deg, var(--bt-rule) 1px, transparent 1px) 0 0 / 28px 100%,
        var(--bt-white);
    border: 1.5px solid var(--bt-ink);
    padding: clamp(28px, 5vw, 56px) clamp(24px, 4.5vw, 56px) clamp(20px, 3vw, 32px);
}

/* Pieza CUERPO 45 × 75 con cotas */
.bt-piece {
    position: relative;
    margin: 0 auto;
    max-width: 340px;
}
.bt-piece__body {
    position: relative;
    aspect-ratio: 45 / 75;
    border: 2.5px dashed var(--bt-ink);   /* la puntada del molde */
    background: rgba(241, 90, 41, .05);
    display: grid;
    place-items: center;
}
.bt-piece__label {
    text-align: center;
    color: var(--bt-ink);
    font-family: var(--bt-font-mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
}
.bt-piece__label strong {
    display: block;
    font-family: var(--bt-font-display);
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    letter-spacing: .04em;
    margin-bottom: .35rem;
}
/* Línea de doblez al centro */
.bt-piece__fold {
    position: absolute;
    left: 8px; right: 8px; top: 50%;
    height: 0;
    border-top: 2px dotted var(--bt-orange);
}
.bt-piece__fold span {
    position: absolute;
    right: 0;
    top: -1.5em;
    font-family: var(--bt-font-mono);
    font-size: .6rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--bt-orange-deep);
    background: var(--bt-white);
    padding: 0 4px;
}
/* Cortes triangulares de la base (esquinas inferiores) */
.bt-piece__notch {
    position: absolute;
    width: 34px; height: 34px;
    bottom: -2.5px;
    border: 2.5px dashed var(--bt-orange);
    background: var(--bt-cream);
}
.bt-piece__notch--l { left: -2.5px;  clip-path: polygon(0 0, 100% 100%, 0 100%); }
.bt-piece__notch--r { right: -2.5px; clip-path: polygon(100% 0, 100% 100%, 0 100%); }

/* Cotas (medidas) */
.bt-dim {
    position: absolute;
    font-family: var(--bt-font-mono);
    font-size: .68rem;
    letter-spacing: .1em;
    color: var(--bt-ink);
    font-weight: 700;
    white-space: nowrap;
}
.bt-dim--w {
    top: -2rem;
    left: 0; right: 0;
    text-align: center;
}
.bt-dim--w::before {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 1.35em;
    border-top: 1px solid var(--bt-ink);
}
.bt-dim--w::after {
    content: "";
    position: absolute;
    left: 0; right: 0; top: calc(1.35em - 3px);
    height: 7px;
    border-left: 1px solid var(--bt-ink);
    border-right: 1px solid var(--bt-ink);
}
.bt-dim--h {
    top: 50%;
    left: -2.4rem;
    transform: translateY(-50%) rotate(180deg);
    writing-mode: vertical-rl;
}

/* Asas 5 × 40 (dos tiras) */
.bt-straps {
    display: flex;
    gap: clamp(16px, 2vw, 24px);
    justify-content: center;
    margin-top: clamp(1.75rem, 3vw, 2.5rem);
    padding-top: clamp(1.25rem, 2vw, 1.75rem);
    background-image: var(--bt-stitch-h);
    background-repeat: no-repeat;
    background-position: top left;
    background-size: 100% 2px;
}
.bt-strap {
    width: clamp(30px, 4vw, 38px);
    height: clamp(150px, 20vw, 190px);
    border: 2.5px dashed var(--bt-ink);
    background: rgba(106, 82, 162, .08);
    position: relative;
}
.bt-strap span {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%) rotate(180deg);
    writing-mode: vertical-rl;
    font-family: var(--bt-font-mono);
    font-size: .6rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--bt-ink);
    white-space: nowrap;
}

/* Leyenda del molde */
.bt-molde__legend { display: flex; flex-direction: column; gap: clamp(14px, 2vw, 20px); }
.bt-molde__legend-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
    padding: clamp(12px, 1.8vw, 18px);
    background: var(--bt-white);
    border: 1.5px solid var(--bt-ink);
}
.bt-molde__legend-key {
    font-family: var(--bt-font-display);
    text-transform: uppercase;
    font-size: 1rem;
    line-height: 1;
    background: var(--bt-ink);
    color: var(--bt-paper);
    padding: 6px 9px;
}
.bt-molde__legend-item p { margin: 0; font-size: .92rem; }
.bt-molde__legend-item .bt-mono { color: var(--bt-muted); display: block; margin-bottom: .2rem; }

/* =========================================================================
   05 · PROCEDIMIENTO — sticky-side + hilo punteado
   ========================================================================= */
.bt-number-head {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(1rem, 2vw, 1.5rem);
    align-items: end;
    margin: 0 0 clamp(2.25rem, 4.5vw, 3.5rem);
    padding-bottom: clamp(1rem, 2vw, 1.5rem);
    border-bottom: 1px solid var(--bt-rule);
}
.bt-number-head__num {
    font-family: var(--bt-font-display);
    font-size: clamp(4.5rem, 12vw, 9.5rem);
    line-height: .8;
    letter-spacing: -0.04em;
    color: var(--bt-orange);
    font-variant-numeric: tabular-nums;
}
.bt-number-head__eyebrow {
    font-family: var(--bt-font-body);
    font-weight: 800;
    font-size: .8rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--bt-purple);
    margin: 0 0 .5rem;
}
.bt-number-head__title { margin: 0; }
@media (min-width: 720px) {
    .bt-number-head { grid-template-columns: minmax(0, .38fr) minmax(0, 1fr); gap: clamp(2rem, 4vw, 4rem); }
}

.bt-steps-layout {
    display: grid;
    grid-template-columns: minmax(0, .4fr) minmax(0, 1fr);
    gap: clamp(24px, 4.5vw, 72px);
    align-items: start;
}
.bt-steps-rail {
    position: sticky;
    top: clamp(120px, 14vw, 140px);
    display: flex;
    flex-direction: column;
    gap: clamp(14px, 2vw, 20px);
}
.bt-steps-rail__meta {
    list-style: none;
    margin: 0;
    padding: clamp(12px, 2vw, 16px);
    border: 1.5px solid var(--bt-ink);
    background: var(--bt-cream);
    display: flex;
    flex-direction: column;
    gap: .5rem;
    font-family: var(--bt-font-mono);
    font-size: .7rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--bt-muted);
}
.bt-steps-rail__meta strong { color: var(--bt-ink); }
.bt-steps-rail__figure { margin: 0; border: 1.5px solid var(--bt-ink); }
.bt-steps-rail__figure img { width: 100%; height: auto; display: block; }
.bt-steps-rail__figure figcaption {
    padding: 6px 10px;
    border-top: 1.5px dashed var(--bt-ink);
    font-family: var(--bt-font-mono);
    font-size: .62rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--bt-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Lista de pasos con hilo punteado que los une */
.bt-steps {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
}
.bt-steps::before {              /* el hilo del taller */
    content: "";
    position: absolute;
    left: 31px;                   /* centrado bajo el badge (8px + 48px/2) */
    top: 20px;
    bottom: 20px;
    width: 2px;
    background-image: var(--bt-stitch-v);
}
.bt-step {
    position: relative;
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: clamp(14px, 2vw, 24px);
    padding: clamp(14px, 2vw, 20px) 0 clamp(14px, 2vw, 20px) 8px;
    transition:
        transform var(--bt-motion-base) var(--bt-ease-out),
        padding-left var(--bt-motion-base) var(--bt-ease-out);
}
.bt-step + .bt-step { border-top: 1px solid var(--bt-rule); }
.bt-step::before {               /* barra side-shift */
    content: "";
    position: absolute;
    left: -12px;
    top: 12px;
    bottom: 12px;
    width: 0;
    background: var(--bt-orange);
    transition: width var(--bt-motion-base) var(--bt-ease-out);
}
.bt-step:hover { transform: translateX(4px); }
.bt-step:hover::before { width: 3px; }
.bt-step__num {
    position: relative;           /* tapa el hilo a su paso */
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    background: var(--bt-white);
    border: 2px solid var(--bt-ink);
    font-family: var(--bt-font-display);
    font-size: 1.25rem;
    line-height: 1;
    color: var(--bt-ink);
}
.bt-step:nth-child(odd) .bt-step__num { background: var(--bt-orange); border-color: var(--bt-orange-deep); color: var(--bt-white); }
.bt-step__title {
    margin: .35rem 0 .3rem;
    font-family: var(--bt-font-display);
    font-weight: 400;
    text-transform: uppercase;
    font-size: clamp(1.05rem, 1.6vw, 1.3rem);
    letter-spacing: .03em;
}
.bt-step__text { margin: 0; color: var(--bt-ink); max-width: 58ch; }
.bt-step__tip {
    margin: .5rem 0 0;
    font-family: var(--bt-font-mono);
    font-size: .66rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--bt-muted);
}

/* =========================================================================
   06 · FIUBAGS — Fanzine: ya están hechas
   ========================================================================= */
.bt-fanzine__head {
    position: relative;
    max-width: 64ch;
    margin: 0 0 clamp(2rem, 4vw, 3rem);
    padding-right: clamp(90px, 12vw, 130px);   /* aire para el burst */
}
.bt-fanzine__claim {
    font-family: var(--bt-font-accent);
    font-style: italic;
    font-size: clamp(1.5rem, 3.2vw, 2.6rem);
    line-height: 1.2;
    margin: 0 0 .8rem;
    color: var(--bt-ink);
}
.bt-fanzine__claim strong {
    font-style: normal;
    font-family: var(--bt-font-display);
    font-weight: 400;
    text-transform: uppercase;
    background: var(--bt-ink);
    color: var(--bt-paper);
    padding: 0 .18em;
}
.bt-fanzine__sub { margin: 0; color: var(--bt-muted); max-width: 52ch; }

.bt-burst {
    position: absolute;
    right: 0;
    top: -8px;
    transform: rotate(-8deg);
    background: var(--bt-yellow);
    color: var(--bt-ink);
    border: 2px solid var(--bt-ink);
    font-family: var(--bt-font-display);
    text-transform: uppercase;
    font-size: clamp(.8rem, 1.4vw, 1rem);
    letter-spacing: .05em;
    line-height: 1.1;
    padding: 10px 14px;
    text-align: center;
    box-shadow: 4px 4px 0 var(--bt-ink);
}

.bt-fiubags-banner { display: block; border: 2px solid var(--bt-ink); }
.bt-fiubags-banner img { width: 100%; height: auto; display: block; }

.bt-fiubags-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(14px, 2vw, 24px);
    margin-top: clamp(24px, 4vw, 40px);
}
.bt-fiubags-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--bt-ink);
    background: var(--bt-white);
    border: 2px solid var(--bt-ink);
}
.bt-fiubags-card:hover { text-decoration: none; color: var(--bt-ink); }
.bt-fiubags-card img { width: 100%; height: auto; display: block; border-bottom: 2px solid var(--bt-ink); }
.bt-fiubags-card__cap { padding: 10px 12px 12px; }
.bt-fiubags-card__cap .bt-mono { color: var(--bt-muted); display: block; margin-bottom: .15rem; font-size: .62rem; }
.bt-fiubags-card__cap strong {
    font-family: var(--bt-font-display);
    font-weight: 400;
    text-transform: uppercase;
    font-size: .95rem;
    letter-spacing: .03em;
}

/* =========================================================================
   07 · TABLA TELAS Y USOS — Almanaque
   ========================================================================= */
.bt-table-intro { max-width: 62ch; margin: 0 0 clamp(1.5rem, 3vw, 2.25rem); color: var(--bt-muted); }
.bt-table-wrap { overflow-x: auto; }
.bt-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bt-white);
    border: 1.5px solid var(--bt-ink);
}
.bt-table thead th {
    font-family: var(--bt-font-mono);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    text-align: left;
    background: var(--bt-ink);
    color: var(--bt-paper);
    padding: 12px 16px;
    font-weight: 400;
}
.bt-table tbody td {
    padding: clamp(12px, 1.8vw, 18px) 16px;
    border-top: 1px solid var(--bt-rule);
    vertical-align: top;
    font-size: .95rem;
}
.bt-table tbody tr:nth-child(even) td { background: var(--bt-paper); }
.bt-table__tela {
    font-family: var(--bt-font-display);
    font-weight: 400;
    text-transform: uppercase;
    font-size: 1rem;
    letter-spacing: .03em;
    white-space: nowrap;
}
.bt-table__compo { color: var(--bt-muted); min-width: 180px; }

.bt-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.bt-chip {
    display: inline-block;
    padding: 5px 12px;
    border: 1.5px solid var(--bt-ink);
    border-radius: 9999px;                  /* pill: única excepción al radius 0 */
    font-family: var(--bt-font-body);
    font-weight: 700;
    font-size: .78rem;
    color: var(--bt-ink);
    text-decoration: none;
    background: var(--bt-white);
    transition:
        background-color var(--bt-motion-base) var(--bt-ease-out),
        color var(--bt-motion-base) var(--bt-ease-out);
}
.bt-chip:hover,
.bt-chip:focus-visible { background: var(--bt-ink); color: var(--bt-paper); text-decoration: none; }
.bt-chip:active { background: var(--bt-orange); color: var(--bt-ink); }

/* =========================================================================
   09 · VIDEO — pausa oscura
   ========================================================================= */
.bt-video-shell {
    max-width: 900px;
    margin: 0 auto;
}
.bt-video-frame {
    position: relative;
    aspect-ratio: 16 / 9;
    border: 2px solid var(--bt-paper);
    box-shadow: 8px 8px 0 var(--bt-orange);
    background: #000;
}
.bt-video-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
.bt-video-credit {
    margin: clamp(1.5rem, 3vw, 2rem) 0 0;
    font-size: .9rem;
    color: var(--bt-muted-dark);
    text-align: center;
}

/* =========================================================================
   11 · TELAS PARA BOLSAS — Dossier + zigzag
   ========================================================================= */
.bt-dossier-head {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(1rem, 4vw, 4rem);
    align-items: end;
    padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
    margin-bottom: clamp(2.5rem, 5vw, 4rem);
    border-bottom: 2px solid var(--bt-ink);
}
@media (min-width: 860px) {
    .bt-dossier-head { grid-template-columns: minmax(0, .35fr) minmax(0, 1fr); }
}
.bt-dossier-head__title { margin: 0; }

.bt-zigzag { display: flex; flex-direction: column; gap: clamp(48px, 8vw, 88px); }
.bt-zigzag__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: clamp(24px, 5vw, 64px);
}
.bt-zigzag__row--flip .bt-zigzag__media { order: 2; }
.bt-zigzag__media { margin: 0; }
.bt-zigzag__media a { display: block; border: 1.5px solid var(--bt-ink); }
.bt-zigzag__media img { width: 100%; height: auto; display: block; }
.bt-zigzag__media figcaption {
    margin-top: .5rem;
    font-size: .78rem;
    color: var(--bt-muted);
}
.bt-zigzag__media figcaption a,
.bt-video-credit a {
    color: inherit;
    font-weight: 700;
    text-decoration: none;
    background-image: linear-gradient(var(--bt-orange) 0 0);
    background-repeat: no-repeat;
    background-position: left bottom;
    background-size: 0% 2px;
    padding-bottom: 1px;
    transition: background-size var(--bt-motion-base) var(--bt-ease-out);
}
.bt-zigzag__media figcaption a:hover,
.bt-zigzag__media figcaption a:focus-visible,
.bt-video-credit a:hover,
.bt-video-credit a:focus-visible { background-size: 100% 2px; color: inherit; text-decoration: none; }
.bt-zigzag__title { margin: 0 0 clamp(.9rem, 1.5vw, 1.25rem); }
.bt-zigzag__body { max-width: 58ch; }

/* =========================================================================
   12 · COSMETIQUERAS — Vitrina full-frame
   ========================================================================= */
.bt-frame {
    border: 2px solid var(--bt-ink);
    padding: clamp(28px, 5vw, 56px);
    position: relative;
}
.bt-frame .bt-tab-inline {
    position: absolute;
    top: 0;
    left: clamp(20px, 4vw, 40px);
    transform: translateY(-50%);
    background: var(--bt-purple);
    color: var(--bt-white);
    font-family: var(--bt-font-mono);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    padding: 6px 14px;
}
.bt-cosmeti {
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: clamp(24px, 4.5vw, 56px);
    align-items: center;
}
.bt-cosmeti__title { margin: 0 0 clamp(.9rem, 1.5vw, 1.25rem); }
.bt-cosmeti__stat {
    display: block;
    font-family: var(--bt-font-mono);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--bt-muted);
    margin-top: clamp(1rem, 2vw, 1.5rem);
    padding-top: .75rem;
    background-image: var(--bt-stitch-h);
    background-repeat: no-repeat;
    background-position: top left;
    background-size: 100% 2px;
}
.bt-cosmeti__stat strong { color: var(--bt-orange-deep); font-size: 1rem; }
.bt-cosmeti__media { margin: 0; }
.bt-cosmeti__media a { display: block; border: 1.5px solid var(--bt-ink); }
.bt-cosmeti__media img { width: 100%; height: auto; display: block; }

/* =========================================================================
   13 · USOS / BENEFICIOS — vertical split
   ========================================================================= */
.bt-vsplit {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 2px solid var(--bt-ink);
}
.bt-vsplit__pane {
    padding: clamp(28px, 5vw, 64px) clamp(22px, 4vw, 56px);
    display: flex;
    flex-direction: column;
    gap: clamp(14px, 2vw, 22px);
}
.bt-vsplit__pane--light { background: var(--bt-paper); color: var(--bt-ink); }
.bt-vsplit__pane--dark  { background: var(--bt-ink); color: var(--bt-paper); }
.bt-vsplit__pane--dark .bt-link { color: var(--bt-paper); box-shadow: inset 0 -2px 0 var(--bt-rule-on-dark); }
.bt-vsplit__pane--dark .bt-link:hover,
.bt-vsplit__pane--dark .bt-link:focus-visible { color: var(--bt-paper); }
.bt-vsplit__title { margin: 0; }
.bt-vsplit__pane--dark .bt-vsplit__title em { color: var(--bt-orange); }
.bt-vsplit__figure { margin: 0; border: 1.5px solid currentColor; }
.bt-vsplit__figure img { width: 100%; height: auto; display: block; }
.bt-vsplit__figure figcaption { padding: 6px 10px; font-size: .74rem; }
.bt-vsplit__pane--light .bt-vsplit__figure figcaption { color: var(--bt-muted); }
.bt-vsplit__pane--dark  .bt-vsplit__figure figcaption { color: var(--bt-muted-dark); }
.bt-vsplit__figure figcaption a { color: inherit; font-weight: 700; text-decoration: underline; }
.bt-vsplit__figure figcaption a:hover { color: inherit; }

/* checklist de usos: la puntada como viñeta */
.bt-checklist { list-style: none; margin: 0; padding: 0; }
.bt-checklist li {
    position: relative;
    padding: .55rem 0 .55rem 2rem;
}
.bt-checklist li + li { border-top: 1px dashed var(--bt-rule); }
.bt-checklist li::before {
    content: "";                              /* muestra de tela como viñeta */
    position: absolute;
    left: 0;
    top: .95rem;
    width: .8em;
    height: .8em;
    background: var(--bt-orange);
    border: 1.5px solid var(--bt-ink);
}
.bt-checklist .bt-link { font-weight: 700; }

/* lista numerada de beneficios (sobre dark) */
.bt-numlist { list-style: none; margin: 0; padding: 0; counter-reset: bt-benefit; }
.bt-numlist li {
    position: relative;
    counter-increment: bt-benefit;
    padding: .65rem 0 .65rem 2.6rem;
}
.bt-numlist li + li { border-top: 1px dashed var(--bt-rule-on-dark); }
.bt-numlist li::before {
    content: counter(bt-benefit, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: .75rem;
    font-family: var(--bt-font-mono);
    font-size: .78rem;
    letter-spacing: .05em;
    color: var(--bt-orange);
    font-weight: 700;
}

/* =========================================================================
   14 · AMBIENTAL — DropCap + marginalia
   ========================================================================= */
.bt-marginalia {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, .38fr);
    gap: clamp(24px, 5vw, 64px);
    align-items: start;
}
.bt-marginalia__main { max-width: 64ch; }
.bt-dropcap {
    float: left;
    font-family: var(--bt-font-accent);
    font-style: italic;
    font-size: clamp(4rem, 8vw, 6rem);
    line-height: .82;
    color: var(--bt-orange);
    padding: .1em .15em 0 0;
    margin-top: .05em;
}
.bt-marginalia__main .bt-body em {
    font-family: var(--bt-font-accent);
    font-style: italic;
    color: var(--bt-ink);
    background: rgba(241, 90, 41, .12);
    padding: 0 .15em;
}
.bt-marginalia__notes {
    display: flex;
    flex-direction: column;
    gap: clamp(16px, 2vw, 24px);
    padding-left: clamp(16px, 2vw, 24px);
    border-left: 2px solid var(--bt-orange);
}
.bt-marginalia__note { margin: 0; font-size: .88rem; line-height: 1.5; color: var(--bt-muted); }
.bt-marginalia__note strong {
    display: block;
    font-family: var(--bt-font-display);
    font-weight: 400;
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    line-height: 1;
    letter-spacing: -.02em;
    color: var(--bt-ink);
    margin-bottom: .3rem;
    font-variant-numeric: tabular-nums;
}

/* =========================================================================
   15 · CTA FINAL — mega-text sobre ink
   ========================================================================= */
.bt-cta {
    position: relative;
    isolation: isolate;
    overflow: hidden;
}
.bt-cta__mega {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    font-family: var(--bt-font-display);
    font-size: clamp(7rem, 24vw, 20rem);
    line-height: 1;
    text-transform: uppercase;
    color: var(--bt-rule-on-dark);
    z-index: -1;
    pointer-events: none;
    white-space: nowrap;
}
.bt-cta__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(28px, 5vw, 64px);
    align-items: center;
}
.bt-cta__title { margin: 0 0 clamp(1rem, 2vw, 1.5rem); }
.bt-cta__title em { color: var(--bt-orange); }
.bt-cta__sub { margin: 0 0 clamp(1.5rem, 3vw, 2.25rem); color: var(--bt-muted-dark); max-width: 46ch; }
.bt-cta__actions { display: flex; flex-wrap: wrap; gap: clamp(14px, 2vw, 20px); }
.bt-cta__media { margin: 0; }
.bt-cta__media a { display: block; border: 2px solid var(--bt-paper); }
.bt-cta__media img { width: 100%; height: auto; display: block; }

/* =========================================================================
   16 · FAQ — details/summary + ax-faq.js
   ========================================================================= */
.bt-faq { border-top: 2px solid var(--bt-ink); }
.bt-faq__item { border-bottom: 1px solid var(--bt-rule); }
.bt-faq__q {
    position: relative;
    list-style: none;
    cursor: pointer;
    padding: clamp(16px, 2.5vw, 22px) 56px clamp(16px, 2.5vw, 22px) 8px;
    transition:
        transform var(--bt-motion-base) var(--bt-ease-out),
        padding-left var(--bt-motion-base) var(--bt-ease-out);
}
.bt-faq__q::-webkit-details-marker { display: none; }
.bt-faq__q::before {
    content: "";
    position: absolute;
    left: -12px;
    top: 12px;
    bottom: 12px;
    width: 0;
    background: var(--bt-orange);
    transition: width var(--bt-motion-base) var(--bt-ease-out);
}
.bt-faq__q:hover { transform: translateX(4px); }
.bt-faq__q:hover::before { width: 3px; }
.bt-faq__q h3 {
    display: inline;
    margin: 0;
    font-family: var(--bt-font-body);
    font-weight: 800;
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    line-height: 1.4;
    color: var(--bt-ink);
}
.bt-faq__q::after {                       /* aguja +/− */
    content: "+";
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: 2px solid var(--bt-ink);
    font-family: var(--bt-font-display);
    font-size: 1.15rem;
    line-height: 1;
    transition:
        background-color var(--bt-motion-base) var(--bt-ease-out),
        color var(--bt-motion-base) var(--bt-ease-out);
}
.bt-faq__item[open] .bt-faq__q::after { content: "−"; background: var(--bt-ink); color: var(--bt-paper); }
.bt-faq__a { padding: 0 8px clamp(18px, 2.5vw, 24px); max-width: 68ch; }
.bt-faq__a p { margin: 0; color: var(--bt-ink); }

/* Caja de contacto FAQ */
.bt-faq-contact {
    margin-top: clamp(2.5rem, 4.5vw, 3.5rem);
    background: var(--bt-cream);
    border: 1.5px solid var(--bt-ink);
    padding: clamp(24px, 4vw, 40px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(18px, 3vw, 32px);
    align-items: center;
}
.bt-faq-contact__title { margin: 0 0 .4rem; }
.bt-faq-contact__text { margin: 0; color: var(--bt-muted); max-width: 48ch; }

/* ─── Includes compartidos: respiro entre bloques ──────────────────────── */
.bt-shared-include { padding: 32px 0; }

/* ─── Accesibilidad ────────────────────────────────────────────────────── */
.bt-page a:focus-visible,
.bt-page summary:focus-visible,
.bt-page button:focus-visible {
    outline: 3px solid var(--bt-purple);
    outline-offset: 3px;
}
.bt-section--ink a:focus-visible { outline-color: var(--bt-yellow); }

@media (prefers-reduced-motion: reduce) {
    .bt-page *,
    .bt-page *::before,
    .bt-page *::after {
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
    }
}

/* =========================================================================
   RESPONSIVE
   ========================================================================= */
@media (max-width: 1024px) {
    .bt-fiubags-cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
    .bt-molde { grid-template-columns: 1fr; }
    .bt-steps-layout { grid-template-columns: 1fr; }
    .bt-steps-rail { position: static; flex-direction: row; flex-wrap: wrap; }
    .bt-steps-rail__meta { flex: 1 1 100%; flex-direction: row; flex-wrap: wrap; gap: .5rem 1.5rem; }
    .bt-steps-rail__figure { flex: 1 1 calc(33% - 12px); min-width: 140px; }
    .bt-cosmeti { grid-template-columns: 1fr; }
    .bt-marginalia { grid-template-columns: 1fr; }
    .bt-marginalia__notes {
        border-left: 0;
        border-top: 2px solid var(--bt-orange);
        padding-left: 0;
        padding-top: 16px;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 24px;
    }
    .bt-marginalia__note { flex: 1 1 220px; }
    .bt-cta__grid { grid-template-columns: 1fr; }
    .bt-dossier-head { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
    .bt-zigzag__row { grid-template-columns: 1fr; }
    .bt-zigzag__row--flip .bt-zigzag__media { order: 0; }   /* imagen siempre arriba */
    .bt-vsplit { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .bt-lateral { grid-template-columns: 1fr; }
    .bt-lateral__rail { writing-mode: horizontal-tb; transform: none; padding-right: 0; }
    .bt-dim--h { position: static; writing-mode: horizontal-tb; transform: none; display: block; text-align: center; margin-top: .5rem; }
    .bt-piece { max-width: 260px; }
    .bt-faq-contact { grid-template-columns: 1fr; }
    .bt-fanzine__head { padding-right: 0; padding-top: clamp(56px, 14vw, 72px); }
    .bt-burst { top: 0; }
}

@media (max-width: 560px) {
    .bt-index-head { flex-wrap: wrap; }
    .bt-index-head__leader { display: none; }
    .bt-index-head__tally { flex-basis: 100%; }
    .bt-fiubags-cards { grid-template-columns: 1fr; }
    .bt-table thead { display: none; }
    .bt-table tbody tr { display: block; border-top: 2px solid var(--bt-ink); }
    .bt-table tbody td { display: block; border-top: 0; padding: 10px 14px; }
    .bt-table tbody td::before {
        content: attr(data-columna);
        display: block;
        font-family: var(--bt-font-mono);
        font-size: .62rem;
        letter-spacing: .12em;
        text-transform: uppercase;
        color: var(--bt-muted);
        margin-bottom: .25rem;
    }
    .bt-table tbody td.bt-table__tela::before { display: none; }
}