/* ==========================================================================
   RESPONSIVE.CSS — breakpoints sobre la base mobile de style.css
   Grid: 4 columnas (mobile) · 8 (>=768) · 12 (>=1024)
   Puntos de corte:  480 · 768 · 1024 · 1280 · 1600
   Probado en 320 / 375 / 390 / 430 / 768 / 1024 / 1280 / 1440 / 1920.
   ========================================================================== */

/* ---------- Pantallas muy angostas (320–479) ---------- */
@media (max-width: 479px) {
  .stats { grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--line); }
  .stat { flex-direction: row-reverse; justify-content: space-between; align-items: baseline; padding: 14px 0; border-bottom: 1px solid var(--line); }
  .stat dt { max-width: 60%; }
  .cover__actions .btn { flex-basis: 100%; }
  .case__close span { display: none; }
  .case__close { padding: 0 13px; }
}

/* ---------- Mobile grande (>=480) ---------- */
@media (min-width: 480px) {
  .cover__actions .btn { flex: 0 1 auto; }
}

/* ---------- Tablet chica (>=600) ---------- */
@media (min-width: 600px) {
  .svc-grid { grid-template-columns: 1fr 1fr; gap: 56px var(--gap); }
  .cap { padding: 26px 0; }
  .refs { grid-template-columns: 1fr 1fr; }
}

/* ---------- Tablet (>=768) ---------- */
@media (min-width: 768px) {
  :root { --cols: 8; --gap: 20px; --header-h: 68px; }

  .pcard { flex-basis: 400px; }
  .pillars ul { grid-template-columns: repeat(3, 1fr); column-gap: 20px; }

  .about__media { aspect-ratio: 4 / 3; }
  .caps { grid-template-columns: 1fr 1fr; column-gap: 40px; }
  .why__list { display: grid; grid-template-columns: 1fr 1fr; column-gap: 40px; }

  .profile__tabs { flex-wrap: wrap; overflow: visible; margin-inline: 0; padding: 0; }
  .profile__tabs button { flex: 0 0 auto; }

  .case-row { grid-template-columns: 96px 1fr auto; padding: 24px 0; }
  .case-row__thumb { width: 96px; grid-row: 1 / span 2; }
  .case-row__main { grid-column: 2; }
  .case-row__loc { grid-column: 2; }
  .case-row__go { grid-column: 3; grid-row: 1; align-self: center; }

  .cta__list li { padding: 9px 16px; }
  .footer__grid { row-gap: 48px; }
  .footer__brand { grid-column: 1 / -1; }
  .footer__quick { grid-column: 1 / 5; }
  .footer__contact { grid-column: 5 / -1; }

  .wa-float { padding: 0 22px 0 18px; }
  .wa-float span { display: inline; }

  /* Caso de obra */
  .case { --bar-h: 68px; }
  .case__meta { grid-template-columns: repeat(4, 1fr); }
  .case__meta div { padding-right: 16px; }
  .case__hero { aspect-ratio: 16 / 9; }
  .case__cta-bar p { display: block; }
  .case__cta-bar .btn { flex: 0 0 auto; }
  .tech { grid-template-columns: 1fr 1fr; column-gap: 32px; max-width: 48em; }
  .chapter__fig .media, .ba, .gallery__main { aspect-ratio: 16 / 10; }
  .gallery__thumbs .swiper-slide { width: 112px; }
}

/* ---------- Desktop (>=1024) ---------- */
@media (min-width: 1024px) {
  :root { --cols: 12; --gap: 24px; --header-h: 76px; }

  /* Header: menú en línea */
  .menu-btn { display: none; }
  .nav {
    position: static; z-index: auto; flex-direction: row; align-items: center; gap: 36px; padding: 0;
    background: transparent; color: inherit; visibility: visible; opacity: 1;
  }
  .nav__list { display: flex; gap: 32px; }
  .nav__list a { padding: 8px 0; border: 0; font: 500 .9375rem/1 var(--f-text); letter-spacing: 0; text-transform: none;
    background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat; transition: background-size .3s var(--ease); }
  .nav__list a:hover, .nav__list a.is-on { background-size: 100% 1px; }
  .nav .nav__cta { align-self: auto; min-height: 40px; }
  .header.is-solid .nav .nav__cta { background: var(--ink); color: var(--paper); }
  .header.is-solid .nav .nav__cta:hover { background: var(--graphite); }

  /* Portada */
  .cover__inner { flex-direction: row; align-items: flex-end; justify-content: space-between; padding-bottom: 72px; }
  .cover__scroll { padding-bottom: 6px; }
  .mark--bl, .mark--br { bottom: 28px; }

  /* Encabezados de sección: título a la izquierda, bajada a la derecha */
  .section__top:not(.section__top--ctrl) > .h2 { grid-column: 1 / 8; }
  .section__top:not(.section__top--ctrl) > .lead { grid-column: 8 / -1; align-self: end; }
  .section__top:not(.section__top--ctrl) { align-items: end; }

  /* 02 Quiénes somos */
  .about { align-items: start; }
  .about__media { grid-column: 1 / 6; aspect-ratio: 4 / 5; position: sticky; top: calc(var(--header-h) + 24px); }
  .about__body { grid-column: 7 / -1; gap: 36px; }

  /* 03 Qué hacemos */
  .svc-grid { grid-template-columns: repeat(3, 1fr); gap: 72px var(--gap); }

  /* 04 Obras */
  .pcard { flex-basis: 440px; }

  /* 05 Casos: índice + vista previa */
  .casos { align-items: start; }
  .case-list { grid-column: 1 / 8; }
  .case-preview { display: block; grid-column: 8 / -1; margin-left: var(--gap); position: sticky; top: calc(var(--header-h) + 24px); }
  .case-preview__frame { position: relative; aspect-ratio: 4 / 5; overflow: hidden; background: var(--graphite); }
  .case-preview__frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transform: scale(1.04); transition: opacity .5s var(--ease), transform .9s var(--ease); }
  .case-preview__frame img.is-on { opacity: 1; transform: none; }
  .case-row { grid-template-columns: 56px minmax(0, 1fr) 132px auto; column-gap: 24px; align-items: center; padding: 28px 0; }
  .case-row__thumb { display: none; }
  .case-row__n { display: block; grid-column: 1; grid-row: 1; font: 500 .9375rem/1 var(--f-display); color: var(--muted-d); }
  .case-row__main { grid-column: 2; grid-row: 1; }
  .case-row__loc { grid-column: 3; grid-row: 1; }
  .case-row__go { grid-column: 4; grid-row: 1; }
  .case-row:hover .case-row__go, .case-row.is-active .case-row__go { border-bottom-width: 2px; }
  .case-row.is-active .case-row__n { color: var(--mark); }

  /* 06 Metodología */
  .method { align-items: start; }
  .method__intro { grid-column: 1 / 6; position: sticky; top: calc(var(--header-h) + 32px); }
  .method__list { grid-column: 7 / -1; }
  .mstep { grid-template-columns: 48px 1fr; gap: 28px; }
  .mstep__n { width: 48px; height: 48px; }
  .method__list::before, .method__list::after { left: 23px; top: 24px; }
  .method__list::before { bottom: 24px; }
  .method__list::after { height: calc((100% - 48px) * var(--p)); }

  /* 07 Capacidades */
  .caps { grid-template-columns: repeat(3, 1fr); column-gap: 48px; }

  /* 08 Proceso: pestañas verticales a la izquierda, panel a la derecha */
  .profile { align-items: start; row-gap: 56px; }
  .profile__intro { grid-column: 1 / 8; }
  .profile__tabs { grid-column: 1 / 5; flex-direction: column; gap: 0; border-top: 1px solid var(--line); }
  .profile__tabs button { width: 100%; text-align: left; min-height: 56px; padding: 0 4px; border: 0; border-bottom: 1px solid var(--line); font-size: 1.0625rem; }
  .profile__tabs button:hover { border-color: var(--line); padding-left: 12px; }
  .profile__tabs button { transition: padding .3s var(--ease), background-color .2s, color .2s; }
  .profile__tabs button[aria-selected="true"] { padding-left: 16px; }
  .profile__panels { grid-column: 6 / -1; grid-row: 2; }
  .profile__tabs { grid-row: 2; }

  /* 09 Por qué */
  .why { align-items: start; }
  .why > .h2 { grid-column: 1 / 6; position: sticky; top: calc(var(--header-h) + 32px); }
  .why__list { grid-column: 7 / -1; display: block; }
  .why__list li { padding: 32px 0; }

  /* 10 Contacto */
  .cta__grid { align-items: start; }
  .cta__main { grid-column: 1 / 8; }
  .form { grid-column: 9 / -1; }

  /* 11 Footer */
  .footer__brand { grid-column: 1 / 6; }
  .footer__quick { grid-column: 7 / 10; }
  .footer__contact { grid-column: 10 / -1; }

  /* Caso de obra */
  .case__head { grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); column-gap: var(--gap); align-items: end; }
  .case__type, .case__title { grid-column: 1 / -1; }
  .case__sub { grid-column: 1 / 8; }
  .case__meta { grid-column: 1 / -1; margin-top: 32px; }
  .case__hero { aspect-ratio: 21 / 9; }

  .chapter { display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); column-gap: var(--gap); align-items: start; }
  .chapter__label { grid-column: 1 / 4; position: sticky; top: calc(var(--bar-h) + 84px); margin-bottom: 0; flex-direction: column; gap: 10px; }
  .chapter__body { grid-column: 4 / -1; min-width: 0; }
  .chapter__fig:first-child { margin-top: 0; }
  .case__cta { grid-template-columns: 1fr auto; align-items: end; gap: 32px; }
  .case__cta h3, .case__cta p { grid-column: 1; }
  .case__cta .btn { grid-column: 2; grid-row: 1 / span 2; align-self: end; }
}

/* ---------- Desktop grande (>=1280) ---------- */
@media (min-width: 1280px) {
  .pcard { flex-basis: 480px; }
  .about__media { grid-column: 1 / 6; }
  .about__body { grid-column: 7 / 12; }
  .nav { gap: 44px; }
}

/* ---------- Pantallas muy grandes (>=1600) ---------- */
@media (min-width: 1600px) {
  :root { --gap: 28px; }
  .pcard { flex-basis: 540px; }
  .container { max-width: 1760px; }
  .lead { max-width: 30em; }
}

/* ---------- Pantallas bajas (laptops, horizontal en celular) ---------- */
@media (max-height: 640px) and (orientation: landscape) {
  .cover { min-height: 520px; }
  .cover__title { font-size: clamp(2rem, 9vh, 5rem); }
  .cover__inner { padding-bottom: 36px; gap: 20px; }
  .cover__actions { margin-top: 18px; }
}

/* ---------- Estados de revelado (los activa main.js) ---------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; } }

/* ---------- Swiper: estilos mínimos propios (no se carga el CSS de Swiper) ---------- */
.gallery .swiper-wrapper { transition-property: transform; }
.gallery .swiper-horizontal { touch-action: pan-y; }
.gallery .swiper-slide { flex-shrink: 0; }

/* ---------- Detalles de interacción ---------- */
.round:disabled { opacity: .3; cursor: default; pointer-events: none; }
.ba { touch-action: pan-y; cursor: ew-resize; }
.ba__range { pointer-events: none; }
.is-ph { color: #66675F; }
.section--dark .is-ph, .cta .is-ph, .footer .is-ph { color: var(--muted-d); }

/* Controles del slider: en mobile alcanza con deslizar */
.slider-ctrl { display: none; gap: 8px; }
@media (min-width: 768px) { .slider-ctrl { display: flex; } }
.ba img { pointer-events: none; -webkit-user-drag: none; user-select: none; }
.case__type .chip--status { border: 1px solid var(--ink); }

.ref--empty { grid-column: 1 / -1; }
.footer__brand, .profile__intro { align-content: start; }

/* Video de portada (opcional) */
.cover__video { position: absolute; left: 0; top: -6%; width: 100%; height: 112%; object-fit: cover; opacity: 0; transition: opacity 1.2s var(--ease); }
.cover__video.is-on { opacity: 1; }

/* Áreas táctiles: se amplían sin cambiar el aspecto */
.link, .cta__contact a, .cover__scroll, .header__logo { position: relative; }
.link::before, .cta__contact a::before, .cover__scroll::before, .header__logo::before { content: ""; position: absolute; inset: -10px -6px; }