/* ═══════════════════════════════════════════════════════════════════════
   Jamta-Bauen Constructores — sitio público
   Sistema «Obra Editorial» (inspirado en atrecxa.webflow.io; ver
   .superdesign/design-system.md). El color vive SÓLO en las fotos:
   bandas alternadas tinta / blanco / papel, esquinas rectas, líneas finas.
   ═══════════════════════════════════════════════════════════════════════ */
:root {
  --tinta: #1A1A1A;
  --tinta-suave: #45474A;
  --papel: #F2F1EE;
  --blanco: #FFFFFF;
  --linea: #D6D4CF;
  --linea-oscura: rgba(255, 255, 255, .16);
  --sobre-oscuro: #FFFFFF;
  --sobre-oscuro-suave: rgba(255, 255, 255, .72);

  --f-display: "Aboreto", "Didot", "Times New Roman", serif;
  --f-texto: "Switzer", "Helvetica Neue", Arial, sans-serif;
  --f-etiqueta: "Inter Tight", "Helvetica Neue", Arial, sans-serif;

  --ancho: 1344px;
  --margen: 32px;
  --banda: 120px;
  --transicion: .4s ease;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--papel); color: var(--tinta); font-family: var(--f-texto); font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, h4, p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }

.contenedor { width: 100%; max-width: var(--ancho); margin: 0 auto; padding-left: max(var(--margen), env(safe-area-inset-left)); padding-right: max(var(--margen), env(safe-area-inset-right)); }

/* ── Tipografía ─────────────────────────────────────────────────────── */
.display { font-family: var(--f-display); font-weight: 400; text-transform: uppercase; letter-spacing: -.035em; line-height: 1.04; }
.titulo { font-size: clamp(36px, 4.6vw, 64px); text-wrap: balance; }
.etiqueta { display: inline-flex; align-items: center; gap: 10px; font-family: var(--f-etiqueta); font-weight: 500; font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase; }
.etiqueta::before { content: ""; width: 7px; height: 7px; background: currentColor; transform: rotate(45deg); }
.etiqueta--suave { color: var(--tinta-suave); font-size: 11.5px; }
.etiqueta--suave::before { display: none; }
.etiqueta--clara { color: var(--sobre-oscuro-suave); }
.texto-suave { color: var(--tinta-suave); max-width: 46ch; }
.declaracion { font-size: clamp(24px, 2.8vw, 40px); line-height: 1.22; color: var(--tinta-suave); text-wrap: pretty; }

/* ── Botones y enlaces ──────────────────────────────────────────────── */
.btn { display: inline-flex; align-items: center; justify-content: center; height: 48px; padding: 0 20px; font-size: 15px; font-weight: 500; text-decoration: none; white-space: nowrap; border: 1px solid transparent; transition: background-color .1s ease, color .1s ease, border-color .1s ease; }
.btn--claro { background: var(--blanco); color: var(--tinta); }
.btn--claro:hover { background: var(--papel); }
.btn--tinta { background: var(--tinta); color: var(--blanco); }
.btn--tinta:hover { background: #000; }
.btn--icono { width: 48px; padding: 0; }
.fila-botones { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; }
.fila-botones .btn--icono { margin-left: -14px; }
.fila-botones--centro { justify-content: center; }
.enlace { display: inline-flex; gap: 8px; align-items: center; font-weight: 500; text-decoration: none; background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat; padding-bottom: 2px; transition: background-size var(--transicion); }
.enlace:hover { background-size: 100% 1px; }

/* ── Navegación ─────────────────────────────────────────────────────── */
.nav { position: fixed; inset: 0 0 auto; z-index: 20; color: var(--sobre-oscuro); padding-top: env(safe-area-inset-top); transition: background-color var(--transicion), color var(--transicion), border-color var(--transicion); border-bottom: 1px solid transparent; }
.nav__in { max-width: 1920px; margin: 0 auto; height: 96px; display: flex; align-items: center; gap: 32px; padding-left: max(var(--margen), env(safe-area-inset-left)); padding-right: max(var(--margen), env(safe-area-inset-right)); transition: height var(--transicion); }
.nav__logo { position: relative; flex: none; display: block; width: 185px; height: 36px; }
.nav__logo img { position: absolute; inset: 0; width: 100%; height: 100%; transition: opacity var(--transicion); }
.logo-oscuro { opacity: 0; }
.nav__links { display: flex; align-items: center; gap: 28px; margin-left: auto; font-size: 15px; }
.nav__links a { text-decoration: none; opacity: .92; }
.nav__links a:hover { opacity: 1; text-decoration: underline; text-underline-offset: 6px; text-decoration-thickness: 1px; }
.nav__clientes { font-family: var(--f-etiqueta); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; padding-left: 28px; border-left: 1px solid currentColor; }
.nav__acciones { display: flex; align-items: center; gap: 0; }
.nav__acciones .btn--icono { border-left: 1px solid var(--linea); }
.nav__menu { display: none; }

.nav--solida { background: var(--papel); color: var(--tinta); border-bottom-color: var(--linea); }
.nav--solida .nav__in { height: 76px; }
.nav--solida .logo-claro { opacity: 0; }
.nav--solida .logo-oscuro { opacity: 1; }
.nav--solida .btn--claro { background: var(--tinta); color: var(--blanco); }
.nav--solida .nav__acciones .btn--icono { border-left-color: var(--tinta-suave); }

/* ── Portada ────────────────────────────────────────────────────────── */
.portada { position: relative; min-height: min(100svh, 1000px); min-height: max(640px, min(100svh, 1000px)); display: flex; color: var(--sobre-oscuro); background: var(--tinta); overflow: hidden; }
.portada__foto { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 60%; }
.portada__velo { position: absolute; inset: 0; background: linear-gradient(rgba(0,0,0,.70), rgba(0,0,0,.40) 30%, rgba(0,0,0,0) 48%, rgba(0,0,0,.22) 60%, rgba(0,0,0,.78) 100%); }
.portada__in { position: relative; display: flex; flex-direction: column; justify-content: space-between; padding-top: 168px; padding-bottom: 56px; }
.portada__titulo { font-size: clamp(38px, 4.9vw, 72px); }
.portada__pie { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; }
.portada__texto { display: grid; gap: 24px; max-width: 420px; }
.portada__texto p { color: var(--sobre-oscuro-suave); font-size: 17px; }
.portada__palabra { font-size: clamp(64px, 15vw, 232px); line-height: .78; letter-spacing: -.02em; margin-bottom: -6px; }

.ilustrativa { position: absolute; right: 12px; bottom: 10px; z-index: 2; font-family: var(--f-etiqueta); font-size: 10.5px; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; pointer-events: none; }
.ilustrativa--claro { color: rgba(255, 255, 255, .62); }
.portada > .ilustrativa { right: max(var(--margen), env(safe-area-inset-right)); bottom: 18px; }

/* ── Bandas ─────────────────────────────────────────────────────────── */
.banda { padding-block: var(--banda); }
.banda--papel { background: var(--papel); }
.banda--blanca { background: var(--blanco); }
.banda--tinta { background: var(--tinta); color: var(--sobre-oscuro); }

.encabezado { display: grid; gap: 20px; margin-bottom: 64px; }
.encabezado--doble { grid-template-columns: 1fr 1fr; align-items: end; gap: 24px 120px; }

/* Nosotros */
.nosotros { display: grid; grid-template-columns: 5fr 7fr; gap: 48px 120px; align-items: start; }
.nosotros__lado { display: grid; gap: 28px; }
.chips { display: grid; grid-template-columns: repeat(2, max-content); gap: 8px; }
.chips li { display: inline-flex; align-items: center; gap: 10px; padding: 10px 14px; border: 1px solid var(--linea); font-size: 14px; background: var(--blanco); }
.chips svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; flex: none; }
.compromisos { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 96px; border-top: 1px solid var(--linea); }
.compromisos li { display: grid; gap: 14px; align-content: start; padding: 32px 32px 0 0; }
.compromisos li + li { padding-left: 32px; border-left: 1px solid var(--linea); }
.compromisos__cifra { font-size: clamp(28px, 3.2vw, 48px); line-height: 1; }
.compromisos li > span:last-child { color: var(--tinta-suave); max-width: 24ch; }

/* Fotos */
.foto { position: relative; margin: 0; overflow: hidden; background: var(--linea); }
.foto img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s ease; }
.foto:hover img { transform: scale(1.025); }
.foto--alta { aspect-ratio: 4 / 5; }

/* Servicios */
.tarjetas { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tarjeta { display: grid; gap: 14px; align-content: start; }
.tarjeta .foto { margin-bottom: 10px; }
.tarjeta h3 { font-size: 26px; font-weight: 500; letter-spacing: -.01em; padding-top: 14px; border-top: 1px solid var(--linea); }
.tarjeta p { color: var(--tinta-suave); max-width: 38ch; }
.tarjeta .enlace { justify-self: start; margin-top: 6px; }

/* Proceso */
.proceso { display: grid; grid-template-columns: 7fr 5fr; gap: 64px 120px; align-items: start; }
.proceso .titulo { margin: 20px 0 56px; }
.pasos { border-top: 1px solid var(--linea-oscura); }
.pasos li { display: grid; grid-template-columns: 84px 1fr; gap: 24px; padding: 26px 0; border-bottom: 1px solid var(--linea-oscura); }
.pasos__num { font-size: 30px; color: var(--sobre-oscuro-suave); line-height: 1.1; }
.pasos h3 { font-size: 22px; font-weight: 500; margin-bottom: 4px; }
.pasos p { color: var(--sobre-oscuro-suave); }
.proceso__foto { position: sticky; top: 110px; aspect-ratio: 1 / 1.1; }
.proceso__foto img { object-position: 30% 50%; }

/* Acabados */
.mosaico { display: grid; grid-template-columns: 7fr 5fr; grid-template-rows: 340px 300px; gap: 24px; }
.mosaico__a { grid-row: span 2; }
.mosaico__c { display: none; }
.mosaico figcaption { position: absolute; left: 0; bottom: 0; z-index: 2; background: var(--papel); padding: 10px 16px 0 0; font-family: var(--f-etiqueta); font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase; font-weight: 500; }
@media (min-width: 1100px) {
  .mosaico { grid-template-columns: 5fr 4fr 3fr; grid-template-rows: 300px 300px; }
  .mosaico__c { display: block; grid-row: span 2; }
}

/* Preguntas */
.preguntas { display: grid; grid-template-columns: 5fr 7fr; gap: 48px 120px; }
.preguntas .titulo { margin-top: 20px; }
.acordeon { border-top: 1px solid var(--linea); }
.acordeon details { border-bottom: 1px solid var(--linea); }
.acordeon summary { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 26px 0; font-size: 20px; font-weight: 500; cursor: pointer; list-style: none; }
.acordeon summary::-webkit-details-marker { display: none; }
.acordeon summary::after { content: ""; flex: none; width: 16px; height: 16px; background: linear-gradient(currentColor, currentColor) center / 16px 1.5px no-repeat, linear-gradient(currentColor, currentColor) center / 1.5px 16px no-repeat; transition: transform var(--transicion); }
.acordeon details[open] summary::after { transform: rotate(45deg); }
.acordeon p { color: var(--tinta-suave); padding: 0 48px 28px 0; max-width: 60ch; }

/* Cierre */
.cierre__in { display: grid; justify-items: center; text-align: center; gap: 24px; }
.cierre .titulo { max-width: 18ch; }
.cierre .fila-botones { margin-top: 12px; }

/* Pie */
.pie { background: var(--tinta); color: var(--sobre-oscuro); padding-block: 96px 32px; }
.pie__arriba { display: grid; grid-template-columns: 4fr 8fr; gap: 56px 120px; padding-bottom: 72px; }
.pie__columnas { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.pie__columnas div { display: grid; gap: 10px; align-content: start; }
.pie h4 { font-family: var(--f-etiqueta); font-weight: 500; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--sobre-oscuro-suave); margin-bottom: 8px; }
.pie a, .pie span { color: var(--sobre-oscuro-suave); text-decoration: none; transition: color .1s ease; }
.pie a:hover { color: var(--sobre-oscuro); }
.pie__abajo { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; padding-top: 28px; border-top: 1px solid var(--linea-oscura); font-size: 14px; }

/* Aparición al bajar (sólo si hay JS y movimiento permitido) */
.js .aparece { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.js .aparece.visible { opacity: 1; transform: none; }

/* ── Tableta ────────────────────────────────────────────────────────── */
@media (max-width: 1180px) {
  .nav__links { gap: 20px; }
  .nav__clientes { display: none; }
}
@media (max-width: 1024px) {
  :root { --banda: 96px; }
  .nav__links { position: fixed; inset: 0; z-index: -1; flex-direction: column; justify-content: center; align-items: flex-start; gap: 22px; padding: 120px max(var(--margen), env(safe-area-inset-left)) 48px; background: var(--tinta); color: var(--sobre-oscuro); font-family: var(--f-display); text-transform: uppercase; font-size: clamp(30px, 6vw, 44px); letter-spacing: -.03em; opacity: 0; visibility: hidden; transition: opacity var(--transicion), visibility var(--transicion); }
  .nav__links a { opacity: 1; }
  .nav__clientes { display: block; font-size: 13px; border: 0; padding: 0; margin-top: 16px; font-family: var(--f-etiqueta); }
  .nav--abierta .nav__links { opacity: 1; visibility: visible; }
  .nav--abierta { color: var(--sobre-oscuro); background: transparent; border-bottom-color: transparent; }
  .nav--abierta .logo-claro { opacity: 1; }
  .nav--abierta .logo-oscuro { opacity: 0; }
  .nav__menu { display: grid; place-content: center; gap: 7px; width: 48px; height: 48px; margin-left: 12px; background: none; border: 0; color: inherit; cursor: pointer; }
  .nav__menu span { display: block; width: 26px; height: 1.5px; background: currentColor; transition: transform var(--transicion); }
  .nav--abierta .nav__menu span:first-child { transform: translateY(4.25px) rotate(45deg); }
  .nav--abierta .nav__menu span:last-child { transform: translateY(-4.25px) rotate(-45deg); }
  .nav__acciones { margin-left: auto; }
  .nosotros, .proceso, .preguntas, .encabezado--doble, .pie__arriba { grid-template-columns: 1fr; }
  .proceso__foto { position: relative; top: 0; aspect-ratio: 16 / 10; }
  .tarjetas { grid-template-columns: 1fr 1fr; }
  .tarjetas .tarjeta:last-child { grid-column: span 2; }
  .tarjetas .tarjeta:last-child .foto--alta { aspect-ratio: 16 / 9; }
}

/* ── Celular ────────────────────────────────────────────────────────── */
@media (max-width: 740px) {
  :root { --margen: 16px; --banda: 72px; }
  .nav__in { height: 72px; gap: 12px; }
  .nav--solida .nav__in { height: 64px; }
  .nav__logo { width: 150px; height: 29px; }
  .nav__acciones .btn:not(.btn--icono) { display: none; }
  .nav__acciones .btn--icono { display: none; }
  .portada { min-height: 680px; min-height: max(620px, 100svh); }
  .portada__in { padding-top: 120px; padding-bottom: 40px; }
  .portada__pie { flex-direction: column; align-items: flex-start; }
  .portada__palabra { align-self: flex-end; }
  .portada > .ilustrativa { top: calc(84px + env(safe-area-inset-top)); bottom: auto; }
  .chips { grid-template-columns: 1fr; }
  .compromisos { grid-template-columns: 1fr; margin-top: 56px; }
  .compromisos li, .compromisos li + li { padding: 24px 0; border-left: 0; }
  .compromisos li + li { border-top: 1px solid var(--linea); }
  .tarjetas { grid-template-columns: 1fr; gap: 56px; }
  .tarjetas .tarjeta:last-child { grid-column: auto; }
  .tarjetas .tarjeta:last-child .foto--alta, .foto--alta { aspect-ratio: 4 / 3.4; }
  .pasos li { grid-template-columns: 56px 1fr; gap: 16px; }
  .pasos__num { font-size: 24px; }
  .mosaico { grid-template-columns: 1fr 1fr; grid-template-rows: 260px 180px 180px; gap: 12px; }
  .mosaico__a { grid-column: span 2; grid-row: auto; }
  .mosaico__c { display: none; }
  .acordeon summary { font-size: 18px; padding: 22px 0; }
  .pie__columnas { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .js .aparece { opacity: 1; transform: none; }
}