:root {
  --grafito: #252A2E;
  --logo: #444444;
  --plata: #D8DDE1;
  --hielo: #F3F5F6;
  --blanco: #FFFFFF;
  --cobre-500: #C66A32;
  --cobre-700: #B15722;
  --cobre-800: #944919;
  --cobre-300: #E39A6B;

  --f-titulo: "Inter Tight", "Inter", system-ui, sans-serif;
  --f-texto: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --gutter: 24px;
  --max: 1360px;
  --sec: clamp(96px, 12vw, 176px);
  --hh: 88px;
}
@media (min-width: 900px) { :root { --gutter: 6vw; } }
@media (min-width: 1080px) { :root { --hh: 100px; } }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: var(--hh); }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  font: 400 1.0625rem/1.65 var(--f-texto);
  color: var(--grafito);
  background: var(--blanco);
  overflow-x: hidden;
}
body.is-locked { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid var(--cobre-700); outline-offset: 3px; }
.dark :focus-visible, .bleed :focus-visible, .lb :focus-visible { outline-color: var(--cobre-300); }

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -100px; z-index: 100; background: var(--grafito); color: #fff; padding: 12px 20px; }
.skip:focus { top: 8px; }

.wrap { width: min(var(--max), 100% - 2 * var(--gutter)); margin-inline: auto; }

h1, h2, h3, .btn, .rotulo, .pasos__n {
  font-family: var(--f-titulo);
}
h1 { font-size: clamp(2.75rem, 6vw + 1rem, 6rem); line-height: 1; font-weight: 600; letter-spacing: -0.015em; overflow-wrap: break-word; }
h2 { font-size: clamp(2.25rem, 4vw + 1rem, 4.25rem); line-height: 1.05; font-weight: 600; letter-spacing: -0.02em; overflow-wrap: break-word; }
h3 { font-size: 1.5rem; line-height: 1.2; font-weight: 600; letter-spacing: -0.01em; }
.lead { font-size: 1.25rem; line-height: 1.5; max-width: 52ch; }
p { max-width: 62ch; }

.rotulo {
  font-family: var(--f-texto);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--logo);
  margin-bottom: 24px;
}
.rotulo::before { content: ""; display: block; width: 48px; height: 2px; background: var(--cobre-500); margin-bottom: 20px; }
.rotulo--sm::before { display: none; }
.rotulo--sm { margin-bottom: 12px; }
.dark .rotulo, .bleed .rotulo { color: var(--plata); }

/* Botones y enlaces */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 56px; padding: 0 32px;
  font-size: 1rem; font-weight: 600; text-align: center; text-decoration: none;
  background: var(--cobre-700); color: #fff; border: 2px solid var(--cobre-700); border-radius: 0; cursor: pointer;
  transition: background-color .25s, border-color .25s, color .25s;
}
.btn:hover { background: var(--cobre-800); border-color: var(--cobre-800); }
.btn--ghost { background: transparent; border-color: rgba(255,255,255,.7); color: #fff; }
.btn--ghost:hover { background: #fff; border-color: #fff; color: var(--grafito); }
.btn--line { background: transparent; color: var(--grafito); border-color: var(--grafito); min-height: 48px; padding: 0 24px; }
.btn--line:hover { background: var(--grafito); border-color: var(--grafito); color: #fff; }

.tlink {
  display: inline-flex; align-items: center; min-height: 48px; margin-top: 24px;
  font-weight: 600; text-decoration: none;
  background: linear-gradient(var(--cobre-500), var(--cobre-500)) 0 calc(50% + 14px) / 32px 2px no-repeat;
  padding-bottom: 2px;
  transition: background-size .35s;
}
.tlink::after { content: "→"; margin-left: 10px; }
.tlink:hover { background-size: 100% 2px; }
.bleed .tlink { color: #fff; }
.bleed .tlink { background-image: linear-gradient(var(--cobre-300), var(--cobre-300)); }

/* Header */
.header { position: sticky; top: 0; z-index: 50; background: var(--blanco); border-bottom: 1px solid transparent; transition: border-color .3s; }
.header.is-scrolled { border-bottom-color: var(--plata); }
.header__in { display: flex; align-items: center; gap: 16px; padding-block: 12px; }
.brand { display: flex; align-items: center; gap: 12px; flex: 1 1 auto; min-width: 0; text-decoration: none; }
.brand img { width: 64px; height: auto; flex: none; }
.brand__name {
  font: 600 clamp(0.9375rem, 3.6vw, 1.5rem)/1.1 var(--f-titulo);
  letter-spacing: -0.01em; min-width: 0; flex: 1 1 auto;
}
@media (max-width: 379px) { .brand__name { display: none; } }

.menu-btn { flex: none; width: 48px; height: 48px; display: grid; place-items: center; background: none; border: 0; cursor: pointer; position: relative; z-index: 2; }
.menu-btn__bars, .menu-btn__bars::before, .menu-btn__bars::after { display: block; width: 26px; height: 2px; background: var(--grafito); transition: transform .3s, background-color .3s; }
.menu-btn__bars { position: relative; }
.menu-btn__bars::before, .menu-btn__bars::after { content: ""; position: absolute; left: 0; }
.menu-btn__bars::before { top: -8px; }
.menu-btn__bars::after { top: 8px; }
.menu-btn[aria-expanded="true"] .menu-btn__bars { background: transparent; }
.menu-btn[aria-expanded="true"] .menu-btn__bars::before { transform: translateY(8px) rotate(45deg); }
.menu-btn[aria-expanded="true"] .menu-btn__bars::after { transform: translateY(-8px) rotate(-45deg); }

.nav a { text-decoration: none; }
.nav ul { display: flex; flex-direction: column; }
.nav li a:not(.btn) { display: flex; align-items: center; min-height: 60px; font: 600 1.5rem/1.2 var(--f-titulo); border-bottom: 1px solid var(--plata); letter-spacing: -0.01em; }
.nav li a[aria-current="true"]:not(.btn) { color: var(--cobre-800); }
.nav__cta { margin-top: 32px; width: 100%; }

/* Menú móvil */
.js .nav {
  position: fixed; inset: var(--nav-top, 120px) 0 0 0; z-index: 40;
  background: var(--blanco); padding: 16px var(--gutter) 40px; overflow-y: auto;
  visibility: hidden; opacity: 0; transform: translateY(-8px);
  transition: opacity .25s, transform .25s, visibility 0s .25s;
}
.js .nav.is-open { visibility: visible; opacity: 1; transform: none; transition: opacity .25s, transform .25s; }
html:not(.js) .menu-btn { display: none; }
html:not(.js) .header__in { flex-wrap: wrap; }
html:not(.js) .nav ul { flex-direction: row; flex-wrap: wrap; gap: 0 20px; }
html:not(.js) .nav li a:not(.btn) { font-size: 1rem; min-height: 44px; border: 0; }
html:not(.js) .nav__cta { margin-top: 0; width: auto; }

@media (min-width: 1080px) {
  .menu-btn { display: none; }
  .js .nav, .js .nav.is-open { position: static; inset: auto; padding: 0; overflow: visible; background: none; visibility: visible; opacity: 1; transform: none; transition: none; }
  .nav ul { flex-direction: row; align-items: center; gap: 0 clamp(16px, 1.8vw, 28px); }
  .nav li a:not(.btn) {
    min-height: 48px; font: 500 0.9375rem/1 var(--f-texto); border: 0; letter-spacing: 0;
    background: linear-gradient(var(--cobre-500), var(--cobre-500)) 0 calc(50% + 14px) / 0 2px no-repeat;
    transition: background-size .3s;
  }
  .nav li a:not(.btn):hover, .nav li a[aria-current="true"]:not(.btn) { background-size: 100% 2px; color: var(--grafito); }
  .nav__cta { margin: 0 0 0 4px; width: auto; }
  .nav { margin-left: auto; }
  .header__in { gap: 32px; }
  .brand { flex: 0 1 auto; }
  .brand img { width: 76px; }
  .brand__name { font-size: 1.375rem; flex: none; }
}

/* Escenas a sangre (hero, biogás, drones) */
.bleed { position: relative; isolation: isolate; color: #fff; background: var(--grafito); overflow: hidden; }
.bleed__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; }
.bleed::before { content: ""; position: absolute; inset: 0; z-index: -1; }

.hero { display: flex; flex-direction: column; min-height: max(600px, calc(100svh - 132px)); scroll-margin-top: 0; }
.hero::before { background: linear-gradient(90deg, rgba(37,42,46,.82) 0%, rgba(37,42,46,.62) 45%, rgba(37,42,46,.12) 100%); }
@media (max-width: 899px) { .hero::before { background: linear-gradient(180deg, rgba(37,42,46,.72), rgba(37,42,46,.6)); } }
.hero .bleed__img { object-position: 60% 50%; }
.hero__body { flex: 1 1 auto; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding-block: 72px 56px; }
.hero h1 { max-width: 14ch; text-wrap: balance; }
.hero .lead { margin-top: 28px; color: #eceff1; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 40px; }
.hero__strip { border-top: 1px solid rgba(255,255,255,.25); background: rgba(37,42,46,.5); }
.hero__strip ul { display: flex; flex-wrap: wrap; gap: 0 40px; padding-block: 14px; font-size: 0.9375rem; font-weight: 500; }
.hero__strip li { padding-block: 2px; }

.sec { padding-block: var(--sec); }
.dark { background: var(--grafito); color: #fff; }
.head { margin-bottom: clamp(48px, 6vw, 88px); }
.head .lead { margin-top: 24px; }
.head h2 { max-width: 18ch; }

/* Quiénes somos */
.about { display: grid; gap: 40px; }
.about__text > * + * { margin-top: 24px; }
@media (min-width: 900px) {
  .about { grid-template-columns: 5fr 6fr; gap: 8vw; align-items: start; }
}

/* Biogás */
.biogas { min-height: max(640px, calc(100svh - var(--hh))); display: flex; align-items: flex-start; scroll-margin-top: 0; }
.biogas::before { background: linear-gradient(180deg, rgba(37,42,46,.86) 0%, rgba(37,42,46,.74) 45%, rgba(37,42,46,.2) 80%, rgba(37,42,46,0) 100%); }
.biogas .bleed__img { object-position: 50% 0%; }
.biogas__in { display: grid; gap: 48px; padding-block: 96px 120px; }
.biogas h2 { max-width: 20ch; }
.biogas .lead { margin-top: 28px; color: #eceff1; }
.scope { align-self: center; }
.scope li { padding: 22px 0; border-top: 1px solid rgba(255,255,255,.3); font: 500 clamp(1.25rem, 1.6vw, 1.5rem)/1.3 var(--f-titulo); letter-spacing: -0.01em; }
.scope li:last-child { border-bottom: 1px solid rgba(255,255,255,.3); }
@media (min-width: 1000px) { .biogas__in { grid-template-columns: 7fr 5fr; gap: 6vw; } }

.strip { display: grid; grid-template-columns: 1fr; background: var(--grafito); }
@media (min-width: 640px) { .strip { grid-template-columns: repeat(3, 1fr); } }
.ph { position: relative; display: block; width: 100%; padding: 0; border: 0; background: #1b1f22; overflow: hidden; cursor: zoom-in; }
.ph img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
@media (prefers-reduced-motion: no-preference) {
  .ph img { transition: transform .7s ease; }
  .ph:hover img { transform: scale(1.02); }
}
.strip .ph { aspect-ratio: 4 / 3; }
@media (min-width: 640px) { .strip .ph { aspect-ratio: auto; height: clamp(280px, 34vw, 520px); } }

/* Obra civil */
.civil { background: var(--hielo); display: grid; grid-template-columns: 1fr; }
.civil__text { padding: var(--sec) var(--gutter); display: flex; align-items: center; }
.civil__text > div { width: 100%; max-width: 560px; }
.civil__text .lead { margin-top: 28px; }
.civil__text p + p { margin-top: 16px; }
.civil__img { position: relative; aspect-ratio: 4 / 3; overflow: hidden; }
.civil__img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 60% 50%; }
@media (min-width: 900px) {
  .civil { grid-template-columns: 40% 60%; min-height: 720px; }
  .civil__text { padding-left: max(var(--gutter), calc((100vw - var(--max)) / 2)); padding-right: 5vw; }
  .civil__img { aspect-ratio: auto; }
}

/* Drones */
.drones { min-height: max(640px, calc(100svh - var(--hh))); display: flex; align-items: flex-end; scroll-margin-top: 0; }
.drones::before { background: linear-gradient(0deg, rgba(37,42,46,.9) 0%, rgba(37,42,46,.64) 35%, rgba(37,42,46,0) 70%), linear-gradient(90deg, rgba(37,42,46,.55), rgba(37,42,46,0) 65%); }
.drones .bleed__img { object-position: 46% 50%; }
@media (max-width: 899px) { .drones .bleed__img { object-position: 50% 0%; } }
.drones__in { padding-block: max(120px, 38svh) 72px; }
@media (min-width: 900px) { .drones__in { padding-block: 120px 72px; } }
.drones h2 { max-width: 12ch; }
.drones .lead { margin: 28px 0 40px; color: #eceff1; max-width: 42ch; }

/* Metalmecánico */
.metal__in { display: grid; gap: 48px; align-items: center; }
.metal__img { position: relative; aspect-ratio: 4 / 5; overflow: hidden; max-width: 560px; }
.metal__img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 55% 50%; }
.metal__text .lead { margin-top: 28px; }
@media (min-width: 900px) {
  .metal__in { grid-template-columns: 5fr 6fr; gap: 8vw; }
  .metal { padding-block: clamp(96px, 9vw, 140px); }
}

/* Trabajo real */
.trabajo .head { margin-bottom: clamp(40px, 5vw, 72px); }
.trabajo .lead { color: var(--plata); }
.gal { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(16px, 1.8vw, 28px); }
.gal figure { display: flex; flex-direction: column; grid-column: 1 / -1; }
.gal figcaption { margin-top: 12px; font-size: 0.875rem; line-height: 1.5; color: var(--plata); max-width: 60ch; }
.gal .ph { flex: 1 1 auto; }
.gal__a .ph { aspect-ratio: 16 / 10; }
.gal__b .ph { aspect-ratio: 4 / 5; }
.gal__c .ph { aspect-ratio: 4 / 3; }
@media (min-width: 900px) {
  .gal__a { grid-column: span 8 !important; }
  .gal__b { grid-column: span 4 !important; }
  .gal__a .ph { aspect-ratio: 16 / 10; }
  .gal__b .ph { aspect-ratio: auto; min-height: 320px; }
  .gal__c .ph { aspect-ratio: 21 / 9; }
}

/* Empresas con las que hemos trabajado */
[hidden] { display: none !important; }
.clientes { padding-bottom: clamp(72px, 9vw, 128px); }
.clientes .head { margin-bottom: clamp(40px, 5vw, 72px); }
.clientes__logo { display: block; height: 64px; width: auto; max-width: 180px; object-fit: contain; }
.clientes__logo--card { height: 48px; max-width: 140px; padding: 10px 14px; background: var(--hielo); border: 1px solid var(--plata); box-sizing: content-box; transition: border-color .3s; }
.clientes__fijo li:hover .clientes__logo--card, .clientes__pista li:hover .clientes__logo--card { border-color: var(--logo); }
.clientes__fijo { width: min(var(--max), 100% - 2 * var(--gutter)); margin-inline: auto; display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 40px clamp(40px, 6vw, 96px); }
.clientes__marquee { display: flex; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.clientes__pista { flex: none; min-width: 100%; display: flex; align-items: center; justify-content: space-around; gap: clamp(48px, 6vw, 96px); padding-right: clamp(48px, 6vw, 96px); animation: clientes-giro var(--dur, 40s) linear infinite; }
.clientes__marquee:hover .clientes__pista, .clientes__marquee:focus-within .clientes__pista { animation-play-state: paused; }
@keyframes clientes-giro { to { transform: translateX(-100%); } }
@media (prefers-reduced-motion: reduce) {
  .clientes__marquee { display: block; -webkit-mask-image: none; mask-image: none; width: min(var(--max), 100% - 2 * var(--gutter)); margin-inline: auto; }
  .clientes__pista { animation: none; flex-wrap: wrap; justify-content: center; padding-right: 0; gap: 40px clamp(40px, 6vw, 96px); }
  .clientes__pista[aria-hidden="true"] { display: none; }
}

/* Cobertura */
.cobertura { background: var(--hielo); }
.deptos { display: grid; gap: 40px; }
.deptos li { border-top: 1px solid var(--plata); padding-top: 28px; }
.deptos h3 { font-size: clamp(2.5rem, 8vw + 0.5rem, 4rem); font-weight: 600; line-height: 1; letter-spacing: -0.02em; margin-bottom: 20px; }
.deptos p { color: var(--logo); }
@media (min-width: 768px) { .deptos { grid-template-columns: repeat(3, 1fr); gap: 32px; } }
@media (min-width: 768px) and (max-width: 1099px) { .deptos h3 { font-size: clamp(2rem, 5.2vw, 2.75rem); } }
@media (min-width: 1100px) { .deptos h3 { font-size: clamp(3rem, 4.6vw, 4rem); } }

/* Proceso */
.pasos { display: grid; gap: 40px; }
.pasos li { border-top: 1px solid var(--plata); padding-top: 24px; }
.pasos__n { display: block; font-size: clamp(4rem, 6vw, 6rem); font-weight: 600; line-height: 1; letter-spacing: -0.02em; color: var(--plata); margin-bottom: 24px; }
.pasos h3 { margin-bottom: 12px; }
.pasos p { color: var(--logo); }
@media (min-width: 768px) { .pasos { grid-template-columns: repeat(2, 1fr); gap: 56px 32px; } }
@media (min-width: 1100px) { .pasos { grid-template-columns: repeat(4, 1fr); gap: 32px; } }

/* Redes */
.redes { background: var(--hielo); }
.redes__in { display: grid; gap: 48px; }
.redes__list { max-width: 720px; width: 100%; }
.red { display: flex; align-items: center; gap: 16px; min-height: 80px; padding-block: 12px; text-decoration: none; border-top: 1px solid var(--plata); font: 500 clamp(1.5rem, 3vw, 2rem)/1.2 var(--f-titulo); letter-spacing: -0.01em; transition: color .25s; }
.redes__list li:last-child .red { border-bottom: 1px solid var(--plata); }
.red__n { flex: 1 1 auto; min-width: 0; }
.red__estado { font: 500 0.875rem/1 var(--f-texto); color: var(--logo); letter-spacing: 0; }
.red__flecha { flex: none; font-size: 1.5rem; }
.red:not([aria-disabled="true"]):hover { color: var(--cobre-800); }
.red[aria-disabled="true"] { cursor: default; }
.ico { width: 24px; height: 24px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
@media (min-width: 900px) { .redes__in { grid-template-columns: 5fr 6fr; gap: 8vw; align-items: start; } .redes__list { justify-self: end; } }

/* Cotización */
.cotizar__in { display: grid; gap: 56px; }
.cotizar .lead { margin-top: 24px; color: var(--plata); }
.contacto { margin-top: 40px; display: grid; gap: 20px; }
.contacto li { display: grid; gap: 2px; }
.contacto span { font-size: 0.875rem; color: var(--plata); }
.contacto a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: underline; text-decoration-color: var(--cobre-300); text-underline-offset: 6px; text-decoration-thickness: 2px; overflow-wrap: anywhere; }
.form { display: grid; gap: 24px; grid-template-columns: 1fr; align-content: start; }
.field { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.field label { font-weight: 600; font-size: 0.9375rem; }
.opt { font-weight: 400; color: var(--plata); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 52px; padding: 12px 16px; border-radius: 0; border: 2px solid transparent;
  background: var(--hielo); color: var(--grafito); font-size: 1rem;
}
.field select { appearance: none; -webkit-appearance: none; padding-right: 44px; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1l6 6 6-6' fill='none' stroke='%23252A2E' stroke-width='2'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; text-overflow: ellipsis; }
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder, .field textarea::placeholder { color: #5b6268; }
.field [aria-invalid="true"] { border-color: #ff9d7a; }
.field__error { min-height: 0; font-size: 0.875rem; color: #ffb59a; }
.field__error:empty { display: none; }
.form__actions { display: flex; flex-direction: column; gap: 20px; align-items: flex-start; }
.form__actions .btn { width: 100%; }
.form__help { font-size: 0.9375rem; color: var(--plata); }
@media (min-width: 640px) {
  .form { grid-template-columns: 1fr 1fr; gap: 28px 24px; }
  .field--full { grid-column: 1 / -1; }
  .form__actions .btn { width: auto; }
}
@media (min-width: 640px) { .form__actions { flex-direction: row; align-items: center; gap: 24px; } .form__help { max-width: 34ch; } }
@media (min-width: 1000px) { .cotizar__in { grid-template-columns: 5fr 7fr; gap: 7vw; align-items: start; } }

/* Footer */
.footer { padding-top: clamp(72px, 8vw, 120px); border-top: 1px solid var(--plata); }
.footer__in { display: grid; gap: 48px; }
.footer__brand img { width: 180px; height: auto; }
.footer__name { font: 600 1.5rem/1.2 var(--f-titulo); margin: 16px 0 12px; }
.footer__brand p:last-child { color: var(--logo); font-size: 0.9375rem; max-width: 42ch; }
.footer__list li { color: var(--logo); font-size: 0.9375rem; min-height: 44px; display: flex; align-items: center; }
.footer__list a { display: inline-flex; align-items: center; min-height: 44px; color: var(--grafito); text-decoration: none; background: linear-gradient(var(--cobre-500), var(--cobre-500)) 0 calc(50% + 12px) / 0 2px no-repeat; transition: background-size .3s; overflow-wrap: anywhere; }
.footer__list a:hover { background-size: 100% 2px; }
.footer__list a[aria-disabled="true"] { color: var(--logo); cursor: default; }
.footer__list a[aria-disabled="true"]:hover { background-size: 0 2px; }
.footer__legal { margin-top: 56px; padding-block: 24px 32px; border-top: 1px solid var(--plata); font-size: 0.875rem; color: var(--logo); }
@media (min-width: 640px) { .footer__in { grid-template-columns: 1fr 1fr; } .footer__brand { grid-column: 1 / -1; } }
@media (min-width: 1000px) { .footer__in { grid-template-columns: 1.6fr 1.2fr 1fr .8fr; gap: 5vw; } .footer__brand { grid-column: auto; } }

/* WhatsApp flotante */
.wa-float {
  position: fixed; right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); z-index: 45;
  width: 56px; height: 56px; display: grid; place-items: center;
  background: var(--cobre-700); color: #fff; border-radius: 50%;
  transition: opacity .25s, transform .25s, visibility 0s;
}
.wa-float .ico { width: 28px; height: 28px; }
.wa-float.is-off { opacity: 0; transform: translateY(12px); visibility: hidden; transition: opacity .25s, transform .25s, visibility 0s .25s; }
@media (min-width: 900px) { .wa-float { display: none; } }

/* Lightbox */
.lb { padding: 0; border: 0; background: transparent; max-width: 100vw; max-height: 100vh; width: 100%; height: 100%; color: #fff; }
.lb::backdrop { background: rgba(20,23,26,.94); }
.lb[open] { display: grid; place-items: center; }
.lb figure { display: flex; flex-direction: column; align-items: center; gap: 16px; max-width: calc(100vw - 32px); }
.lb img { max-width: 100%; max-height: 78vh; width: auto; height: auto; object-fit: contain; }
@media (max-width: 639px) { .lb img { max-height: calc(100svh - 210px); } }
.lb figcaption { font-size: 0.875rem; text-align: center; color: var(--plata); max-width: 60ch; }
.lb__btn { position: absolute; width: 48px; height: 48px; display: grid; place-items: center; background: rgba(37,42,46,.9); color: #fff; border: 1px solid rgba(255,255,255,.4); font-size: 1.25rem; cursor: pointer; }
.lb__btn:hover { background: #fff; color: var(--grafito); }
.lb__close { top: 16px; right: 16px; }
.lb__prev { left: 16px; top: 50%; transform: translateY(-50%); }
.lb__next { right: 16px; top: 50%; transform: translateY(-50%); }
@media (max-width: 639px) { .lb__prev, .lb__next { top: auto; bottom: 16px; transform: none; } .lb__prev { left: calc(50% - 56px); } .lb__next { right: calc(50% - 56px); } }

/* Reveal: visible sin JS */
.js .reveal { opacity: 0; transform: translateY(8px); transition: opacity .4s ease, transform .4s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0s !important; animation: none !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}