:root {
  --fondo: #f5f4f0;
  --fondo-alt: #ecebe6;
  --tinta: #161616;
  --tinta-2: #5c5b57;
  --linea: #d9d7d0;
  --rojo: #b8322a;
  --rojo-hover: #9c2921;
  --oscuro: #151515;
  --max: 1180px;
  --pad: clamp(16px, 4vw, 40px);
  --f-titulo: "Inter Tight", system-ui, sans-serif;
  --f-texto: "Inter", system-ui, sans-serif;
}
:root[data-tema="oscuro"] {
  --fondo: #111111;
  --fondo-alt: #181818;
  --tinta: #f2f1ed;
  --tinta-2: #a3a19b;
  --linea: #2b2b2b;
  --oscuro: #0a0a0a;
  --rojo: #c8392f;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--fondo);
  color: var(--tinta);
  font: 400 16px/1.6 var(--f-texto);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--f-titulo); line-height: 1.1; margin: 0; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.1rem, 4.2vw, 3.3rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.75rem); font-weight: 600; }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }
.eyebrow {
  font-size: .78rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--rojo); margin-bottom: 1rem;
}
.lead { font-size: 1.125rem; color: var(--tinta-2); max-width: 34rem; margin-top: 1.25rem; }

/* Botones */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .9rem 1.5rem; border: 1.5px solid var(--rojo); border-radius: 2px;
  background: var(--rojo); color: #fff; font: 600 .95rem var(--f-texto);
  text-decoration: none; cursor: pointer; transition: background .2s, color .2s, border-color .2s;
}
.btn:hover { background: var(--rojo-hover); border-color: var(--rojo-hover); }
.btn--ghost { background: transparent; color: var(--tinta); border-color: var(--tinta); }
.btn--ghost:hover { background: var(--tinta); color: var(--fondo); border-color: var(--tinta); }
.btn--sm { padding: .55rem 1.1rem; font-size: .88rem; }
.btn--block { width: 100%; }

/* Navegación */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--fondo) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent; transition: border-color .2s;
}
.nav.sombra { border-bottom-color: var(--linea); }
.nav__in { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; }
.brand__mark {
  display: grid; place-items: center; width: 38px; height: 38px; flex: none;
  background: var(--rojo); color: #fff; border-radius: 3px;
  font: 700 1rem/1 var(--f-titulo); letter-spacing: -.04em;
}
.brand__txt { display: flex; flex-direction: column; line-height: 1.05; }
.brand__txt b { font: 700 1.1rem var(--f-titulo); letter-spacing: -.01em; }
.brand__txt small { font-size: .68rem; letter-spacing: .2em; text-transform: uppercase; color: var(--tinta-2); }
.nav__links { display: flex; align-items: center; gap: 2rem; }
.nav__links a:not(.btn) { text-decoration: none; font-size: .95rem; color: var(--tinta-2); transition: color .2s; }
.nav__links a:not(.btn):hover { color: var(--tinta); }
.nav__toggle { display: none; background: none; border: 0; padding: 10px; cursor: pointer; }
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--tinta); margin: 5px 0; transition: transform .2s; }

/* Hero */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); height: clamp(540px, 46vw, 660px); }
.hero__in {
  align-self: center; padding-top: 4rem; padding-bottom: 4rem;
  max-width: none; margin: 0; padding-right: clamp(24px, 4vw, 64px);
  padding-left: max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad)));
}
.hero__cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.25rem; }
.hero__img {
  background: var(--fondo-alt) 54% 100% / cover no-repeat;
  position: relative;
}
.hero__img::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 34%; height: 6px; background: var(--rojo);
}

/* Franja */
.cifras { border-top: 1px solid var(--linea); border-bottom: 1px solid var(--linea); }
.cifras__in {
  display: grid; grid-template-columns: repeat(4, 1fr);
  font: 500 .95rem var(--f-titulo); color: var(--tinta-2);
}
.cifras__in span { padding: 1.4rem 0; display: flex; align-items: center; gap: .7rem; }
.cifras__in span::before { content: ""; width: 8px; height: 8px; background: var(--rojo); flex: none; }

/* Secciones */
.sec { padding: clamp(4.5rem, 10vw, 8rem) 0; }
.sec--alt { background: var(--fondo-alt); }
.sec__head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.sec__head--row { display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }

/* Servicios */
.servicios { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--tinta); }
.servicios article { padding: 2rem 1.75rem; border-left: 1px solid var(--linea); }
.servicios article:nth-child(3n+1) { padding-left: 0; border-left: 0; }
.servicios article:nth-child(n+4) { border-top: 1px solid var(--linea); }
.servicios .num { display: block; font: 500 .85rem var(--f-titulo); color: var(--rojo); margin-bottom: 2.5rem; }
.servicios p { color: var(--tinta-2); margin-top: .75rem; font-size: .96rem; }

/* Filtros */
.filtros { display: flex; flex-wrap: wrap; gap: .4rem; }
.filtros button {
  background: transparent; border: 1px solid var(--linea); color: var(--tinta-2);
  padding: .45rem 1rem; border-radius: 99px; font: 500 .88rem var(--f-texto); cursor: pointer;
  transition: all .2s;
}
.filtros button:hover { border-color: var(--tinta); color: var(--tinta); }
.filtros button[aria-selected="true"] { background: var(--tinta); border-color: var(--tinta); color: var(--fondo); }

/* Galería */
.galeria { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem) clamp(1.25rem, 2.2vw, 2rem); }
@media (max-width: 1080px) { .galeria { grid-template-columns: repeat(2, 1fr); } }
.obra {
  display: block; text-align: left; background: none; border: 0; padding: 0;
  font: inherit; color: inherit; cursor: zoom-in;
}
.obra:disabled { cursor: default; }
.obra__img { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: var(--linea); }
.obra__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.obra:hover .obra__img img { transform: scale(1.035); }
.obra__vacio { display: grid; place-items: center; height: 100%; color: #b4b2aa; }
.obra__vacio svg { width: 48px; }
.obra__n {
  position: absolute; right: 12px; bottom: 12px; background: rgba(21,21,21,.78); color: #fff;
  font-size: .78rem; font-weight: 500; padding: .3rem .65rem; border-radius: 2px;
}
.obra__txt { padding-top: 1.1rem; }
.obra__txt p { color: var(--tinta-2); font-size: .95rem; margin-top: .4rem; max-width: 34rem; }
.obra__txt .obra__meta {
  font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; color: var(--rojo); font-weight: 600;
  margin: 0 0 .45rem;
}

/* Nosotros */
.nosotros { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2.5rem, 7vw, 7rem); align-items: start; }
.proceso { list-style: none; margin: 0; padding: 0; counter-reset: paso; border-top: 1px solid var(--tinta); }
.proceso li {
  counter-increment: paso; display: grid; grid-template-columns: 3rem 1fr; row-gap: .2rem;
  padding: 1.4rem 0; border-bottom: 1px solid var(--linea);
}
.proceso li::before { content: counter(paso, decimal-leading-zero); grid-row: span 2; font: 500 .85rem var(--f-titulo); color: var(--rojo); padding-top: .15rem; }
.proceso b { font: 600 1.05rem var(--f-titulo); }
.proceso span { color: var(--tinta-2); font-size: .95rem; }

/* Contacto */
.sec--dark { background: var(--oscuro); color: #f1f0ec; }
.sec--dark .lead { color: #a8a6a0; }
.contacto { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2.5rem, 7vw, 7rem); }
.datos { list-style: none; padding: 0; margin: 2.5rem 0 0; border-top: 1px solid #333; }
.datos li { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid #333; }
.datos span { color: #8d8b85; font-size: .9rem; }
.datos a, .datos b { font-weight: 500; text-decoration: none; }
.datos a:hover { color: #fff; text-decoration: underline; text-underline-offset: 3px; }
.form { display: grid; gap: 1.1rem; align-content: start; }
.form label { display: grid; gap: .4rem; font-size: .85rem; color: #a8a6a0; }
.form input, .form select, .form textarea {
  width: 100%; background: #1f1f1f; border: 1px solid #353535; border-radius: 2px;
  color: #f1f0ec; font: 400 1rem var(--f-texto); padding: .8rem .9rem; transition: border-color .2s;
}
.form textarea { resize: vertical; }
.form :is(input, select, textarea):focus { outline: none; border-color: var(--rojo); }
.form .btn { margin-top: .4rem; }

/* Pie */
.pie { background: var(--oscuro); color: #8d8b85; font-size: .88rem; border-top: 1px solid #2a2a2a; }
.pie__in { display: flex; justify-content: space-between; gap: 1rem; padding-top: 1.6rem; padding-bottom: 1.6rem; }
.pie a { text-decoration: none; }
.pie a:hover { color: #f1f0ec; }

/* WhatsApp flotante */
.wa {
  position: fixed; right: 20px; bottom: 20px; z-index: 60;
  display: flex; align-items: center; gap: .55rem;
  background: #1fa855; color: #fff; text-decoration: none;
  padding: .8rem 1.15rem .8rem .95rem; border-radius: 99px;
  font: 600 .95rem var(--f-texto); box-shadow: 0 6px 20px rgba(0,0,0,.18);
  transition: transform .2s, background .2s;
}
.wa:hover { background: #188f47; transform: translateY(-2px); }
.wa svg { width: 24px; height: 24px; }
@media (max-width: 520px) {
  .wa { right: 16px; bottom: 16px; padding: .9rem; }
  .wa span { display: none; }
}

/* Visor */
.lb {
  position: fixed; inset: 0; z-index: 100; background: rgba(12,12,12,.95);
  display: grid; grid-template-columns: 64px 1fr 64px; align-items: center;
}
.lb[hidden] { display: none; }
.lb figure { margin: 0; grid-column: 2; display: grid; justify-items: center; gap: .9rem; }
.lb img { max-height: 84svh; max-width: 100%; object-fit: contain; }
.lb figcaption { color: #a8a6a0; font-size: .88rem; }
.lb button { background: none; border: 0; color: #fff; cursor: pointer; font: 300 2.6rem/1 var(--f-texto); opacity: .75; }
.lb button:hover { opacity: 1; }
.lb__prev { grid-column: 1; grid-row: 1; }
.lb__next { grid-column: 3; grid-row: 1; }
.lb__x { position: absolute; top: 14px; right: 20px; }
.lb.una .lb__nav { visibility: hidden; }

/* Responsive */
@media (max-width: 960px) {
  .servicios { grid-template-columns: repeat(2, 1fr); }
  .servicios article:nth-child(n) { padding: 2rem 1.75rem; border-left: 1px solid var(--linea); border-top: 0; }
  .servicios article:nth-child(odd) { padding-left: 0; border-left: 0; }
  .servicios article:nth-child(n+3) { border-top: 1px solid var(--linea); }
  .cifras__in { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 820px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute; top: 72px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--fondo); border-bottom: 1px solid var(--linea); padding: .5rem var(--pad) 1.25rem;
    display: none;
  }
  .nav.abierto .nav__links { display: flex; }
  .nav__links a:not(.btn) { padding: .9rem 0; border-bottom: 1px solid var(--linea); font-size: 1rem; }
  .nav__links .btn { margin-top: 1rem; }
  .nav.abierto .nav__toggle span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .nav.abierto .nav__toggle span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

  .hero { grid-template-columns: 1fr; height: auto; }
  .hero__in { max-width: none; margin: 0; padding: 3rem var(--pad) 2.5rem; }
  .hero__img { aspect-ratio: 16 / 10; }
  .galeria, .nosotros, .contacto { grid-template-columns: 1fr; }
  .lb { grid-template-columns: 40px 1fr 40px; }
}
@media (max-width: 520px) {
  .servicios { grid-template-columns: 1fr; }
  .servicios article:nth-child(n) { padding: 1.75rem 0; border-left: 0; }
  .servicios article:nth-child(n+2) { border-top: 1px solid var(--linea); }
  .servicios .num { margin-bottom: 1.25rem; }
  .cifras__in { grid-template-columns: 1fr 1fr; font-size: .85rem; }
  .cifras__in span { padding: 1rem 0; }
  .hero__cta .btn { flex: 1; }
  .pie__in { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}