/* ============================================================
   ADN San Luis — hoja de estilos del sitio institucional
   Paleta: rojo del logo sobre carbón y hueso.
   Tipografía: Archivo (variable, eje de ancho) — Google Fonts.
   ============================================================ */

:root {
  --rojo: #d6342c;
  --rojo-oscuro: #a31e24;
  --bordo: #5e1420;
  --carbon: #1b1013;
  --carbon-2: #140b0e;
  --hueso: #faf6f3;
  --blanco: #ffffff;
  --tinta: #26191c;
  --gris: #77696d;
  --wsp: #1da851;
  --ancho: 1120px;
  --radio: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-stretch: 100%;
  color: var(--tinta);
  background: var(--blanco);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

.visualmente-oculto {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

.cont { max-width: var(--ancho); margin: 0 auto; padding: 0 24px; }

/* ---------- tipografía de títulos: caps expandidas, como la
   rotulación de las unidades ---------- */
h1, h2, h3, .paso-num, .dato, .barra-tel {
  font-stretch: 118%;
}

h1 {
  font-size: clamp(2.5rem, 6.5vw, 4.6rem);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 1.02;
  letter-spacing: .01em;
  color: var(--blanco);
}

h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 1.12;
  margin-bottom: 1.2em;
}

h3 {
  font-size: 1.06rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .02em;
  line-height: 1.3;
}

.ceja {
  font-size: .8rem;
  font-weight: 600;
  font-stretch: 110%;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--rojo);
  margin-bottom: 1em;
}

/* ---------- botones ---------- */
.boton {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font: inherit;
  font-weight: 700;
  font-size: .95rem;
  padding: .95em 1.7em;
  border-radius: 999px;
  border: 0;
  cursor: pointer;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease;
}
.boton:hover { transform: translateY(-2px); }
.boton:focus-visible { outline: 3px solid var(--rojo); outline-offset: 3px; }

.boton-rojo {
  background: var(--rojo);
  color: var(--blanco);
  box-shadow: 0 10px 24px rgba(214, 52, 44, .35);
}
.boton-rojo:hover { background: var(--rojo-oscuro); }

.boton-wsp {
  background: rgba(255, 255, 255, .1);
  color: var(--blanco);
  border: 1px solid rgba(255, 255, 255, .45);
  backdrop-filter: blur(4px);
}
.boton-wsp:hover { background: var(--wsp); border-color: var(--wsp); }

/* ---------- barra superior ---------- */
.barra {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background-color .25s ease, box-shadow .25s ease;
}
.barra.solida {
  background: rgba(20, 11, 14, .93);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 18px rgba(0, 0, 0, .35);
}
.barra-int {
  max-width: var(--ancho);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.barra-logo img { height: 40px; width: auto; }

.barra-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}
.barra-nav a {
  color: var(--blanco);
  text-decoration: none;
  font-size: .92rem;
  font-weight: 600;
  opacity: .92;
}
.barra-nav a:hover { opacity: 1; color: #ffb3ae; }
.barra-nav a:focus-visible { outline: 2px solid var(--blanco); outline-offset: 4px; }

.barra-tel {
  font-weight: 800 !important;
  border: 1px solid rgba(255, 255, 255, .4);
  padding: .45em 1em;
  border-radius: 999px;
  white-space: nowrap;
}
.barra-tel:hover { border-color: var(--rojo); background: var(--rojo); }

.barra-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
}
.barra-menu-btn span:not(.visualmente-oculto) {
  width: 24px; height: 2px;
  background: var(--blanco);
  display: block;
}

/* ---------- portada ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: var(--carbon);
  overflow: hidden;
}
.hero-fondo {
  position: absolute; inset: 0;
  background: url("../img/hero-obra.jpg") center 62% / cover no-repeat;
}
.hero-velo {
  position: absolute; inset: 0;
  background:
    linear-gradient(100deg, rgba(20, 10, 13, .93) 0%, rgba(20, 10, 13, .72) 46%, rgba(20, 10, 13, .25) 100%);
}
.hero-cont {
  position: relative;
  max-width: var(--ancho);
  margin: 0 auto;
  padding: 130px 24px 90px;
  width: 100%;
}
.hero .ceja { color: #ff8f88; }
.hero-baja {
  color: rgba(255, 255, 255, .88);
  max-width: 34em;
  margin-top: 1.4em;
  font-size: 1.05rem;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 2.2em;
}

/* animación de entrada de la portada */
.hero-anim {
  opacity: 0;
  transform: translateY(18px);
  animation: aparecer .7s ease forwards;
  animation-delay: calc(var(--orden) * .12s + .1s);
}
@keyframes aparecer {
  to { opacity: 1; transform: none; }
}

/* ---------- franja tipo banda reflectante ---------- */
.franja {
  height: 10px;
  background: repeating-linear-gradient(-45deg, var(--rojo) 0 14px, var(--blanco) 14px 28px);
}

/* ---------- secciones ---------- */
.seccion { padding: clamp(4rem, 9vw, 6.5rem) 0; scroll-margin-top: 76px; }
.seccion-clara { background: var(--hueso); }
.seccion-oscura {
  background: var(--carbon);
  color: var(--blanco);
}

/* ---------- tarjetas de servicios (paneles de puerta) ---------- */
.tarjetas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: .5em;
}
.tarjeta {
  background: var(--blanco);
  border: 1px solid #eee3e2;
  border-top: 4px solid var(--rojo);
  border-radius: var(--radio);
  padding: 28px 26px 24px;
  box-shadow: 0 6px 22px rgba(38, 25, 28, .06);
  transition: transform .2s ease, box-shadow .2s ease;
}
.tarjeta:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 34px rgba(38, 25, 28, .12);
}
.tarjeta h3 { color: var(--rojo-oscuro); margin-bottom: .9em; }
.tarjeta-txt { font-size: .95rem; margin-bottom: 1em; }
.tarjeta ul { list-style: none; }
.tarjeta li {
  font-size: .95rem;
  padding: .4em 0 .4em 1.5em;
  position: relative;
}
.tarjeta li::before {
  content: "+";
  position: absolute;
  left: 0;
  top: .28em;
  color: var(--rojo);
  font-weight: 800;
  font-size: 1.05em;
  line-height: 1;
}

/* escala de complejidad baja / media / alta */
.escala {
  display: flex;
  gap: 6px;
  margin-bottom: 1.1em;
}
.escala-paso {
  flex: 1;
  text-align: center;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: .45em 0;
  border-radius: 6px;
  color: var(--blanco);
}
.escala-paso.p1 { background: #e98680; }
.escala-paso.p2 { background: #dd5049; }
.escala-paso.p3 { background: var(--rojo-oscuro); }

/* bajada de sección, debajo del h2 */
.seccion-baja {
  max-width: 46em;
  margin: -2.2em 0 2.4em;
  color: #4d3f43;
}

/* grilla de cuatro tarjetas: atención domiciliaria */
.tarjetas-4 { grid-template-columns: repeat(4, 1fr); gap: 18px; }
.tarjetas-4 .tarjeta { padding: 24px 20px 20px; }
.tarjetas-4 .tarjeta li { font-size: .9rem; }

/* ---------- cobertura de obras ---------- */
.obras-grilla {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(30px, 5vw, 64px);
  align-items: center;
}
#obras h2 { color: var(--blanco); }
#obras p { color: rgba(255, 255, 255, .88); }
.obras-lista {
  list-style: none;
  margin: 1.4em 0 1.8em;
  display: grid;
  gap: .55em;
}
.obras-lista li {
  position: relative;
  padding-left: 1.6em;
  color: rgba(255, 255, 255, .9);
  font-size: .97rem;
}
.obras-lista li::before {
  content: "+";
  position: absolute;
  left: 0;
  top: .05em;
  color: #ff8f88;
  font-weight: 800;
  font-size: 1.1em;
}
.obras-exp-titulo {
  font-size: .78rem;
  font-weight: 600;
  font-stretch: 110%;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: rgba(255, 255, 255, .55) !important;
  margin-bottom: .8em;
}
.obras-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 2em;
}
.obras-chips span {
  font-size: .82rem;
  font-weight: 600;
  color: rgba(255, 255, 255, .92);
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 999px;
  padding: .4em 1em;
  background: rgba(255, 255, 255, .05);
}
.galeria {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  grid-auto-rows: 235px;
  gap: 14px;
}
.galeria img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radio);
  box-shadow: 0 14px 30px rgba(0, 0, 0, .35);
}
.galeria .g-v { grid-column: 2; grid-row: 1 / span 2; }
.galeria .g-a { grid-column: 1; grid-row: 1; }
.galeria .g-b { grid-column: 1; grid-row: 2; }

/* ---------- cifras de quiénes somos ---------- */
.cifras {
  display: flex;
  gap: clamp(22px, 4vw, 48px);
  margin-top: 1.8em;
  flex-wrap: wrap;
}
.cifra strong {
  display: block;
  font-size: 2.3rem;
  font-weight: 800;
  font-stretch: 118%;
  line-height: 1;
  color: var(--rojo);
}
.cifra span {
  font-size: .85rem;
  color: var(--gris);
}

/* ---------- chips de clientes sin logo ---------- */
.clientes-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 34px;
}
.clientes-chips.chips-izq { justify-content: flex-start; margin-top: 0; }
.obras-exp-titulo-claro {
  color: var(--gris) !important;
  margin-top: 2.6em;
}
.clientes-chips span {
  font-size: .9rem;
  font-weight: 700;
  font-stretch: 112%;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gris);
  border: 1px solid #e4d9d7;
  border-radius: 999px;
  padding: .5em 1.2em;
  background: var(--blanco);
}

/* ---------- pasos de cómo trabajamos ---------- */
.pasos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 34px;
}
.paso-num {
  display: block;
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.6px var(--rojo);
  margin-bottom: .35em;
}
@supports not (-webkit-text-stroke: 1px black) {
  .paso-num { color: #efb9b5; }
}
.paso h3 { margin-bottom: .5em; }
.paso p { font-size: .96rem; color: #4d3f43; }

/* ---------- quiénes somos ---------- */
.dos-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.foto {
  border-radius: var(--radio);
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(38, 25, 28, .18);
}
.foto img { width: 100%; height: 100%; object-fit: cover; }
.dos-col-txt p:not(.ceja) { margin-bottom: 1em; max-width: 34em; }

/* ---------- clientes ---------- */
.logos {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 30px 40px;
  align-items: center;
  justify-items: center;
  margin-top: 1em;
}
.logos img {
  max-height: 64px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  filter: grayscale(1);
  opacity: .65;
  transition: filter .25s ease, opacity .25s ease;
}
.logos img:hover { filter: none; opacity: 1; }

/* ---------- contacto ---------- */
.seccion-oscura .ceja { color: #ff8f88; }
.contacto-grilla {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(30px, 5vw, 70px);
  align-items: start;
}
.contacto-datos { display: grid; gap: 26px; }
.dato {
  display: block;
  color: var(--blanco);
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.25;
}
.dato-fuerte { font-size: 2.1rem; color: #ff958f; }
a.dato:hover { color: #ffb3ae; }
.dato-etiq {
  display: block;
  font-size: .78rem;
  font-weight: 600;
  font-stretch: 110%;
  text-transform: uppercase;
  letter-spacing: .16em;
  color: rgba(255, 255, 255, .55);
  margin-bottom: .3em;
}
.dato-mail { font-size: 1.15rem; word-break: break-all; }

/* redes sociales */
.redes { display: flex; flex-wrap: wrap; gap: 10px; }
.red {
  display: inline-flex;
  align-items: center;
  gap: .55em;
  font-size: .95rem;
  font-weight: 700;
  color: var(--blanco);
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, .28);
  background: rgba(255, 255, 255, .05);
  border-radius: 999px;
  padding: .5em 1.15em;
  transition: background-color .2s ease, border-color .2s ease, transform .18s ease;
}
.red:hover {
  transform: translateY(-2px);
  background: var(--rojo);
  border-color: var(--rojo);
}
.red:focus-visible { outline: 3px solid var(--blanco); outline-offset: 3px; }

.contacto-form { display: grid; gap: 8px; }
.contacto-form label {
  font-size: .85rem;
  font-weight: 600;
  margin-top: 10px;
}
.contacto-form input,
.contacto-form textarea {
  font: inherit;
  color: var(--blanco);
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 10px;
  padding: .8em 1em;
}
.contacto-form input:focus-visible,
.contacto-form textarea:focus-visible {
  outline: none;
  border-color: var(--rojo);
  box-shadow: 0 0 0 3px rgba(214, 52, 44, .35);
}
.contacto-form .boton { justify-self: start; margin-top: 16px; }
.form-aviso { min-height: 1.4em; font-size: .95rem; }
.form-aviso.ok { color: #7ee2a8; }
.form-aviso.error { color: #ffb3ae; }

/* ---------- pie ---------- */
.pie {
  background: var(--carbon-2);
  color: rgba(255, 255, 255, .65);
  padding: 34px 0;
  font-size: .9rem;
}
.pie-int {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
.pie-logo { height: 34px; width: auto; }
.pie-red {
  margin-left: auto;
  color: rgba(255, 255, 255, .65);
  display: inline-flex;
  transition: color .2s ease, transform .18s ease;
}
.pie-red:hover { color: var(--blanco); transform: translateY(-2px); }
.pie-red:focus-visible { outline: 2px solid var(--blanco); outline-offset: 4px; }

/* ---------- botón flotante de WhatsApp ---------- */
.wsp-flotante {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--wsp);
  color: var(--blanco);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 26px rgba(0, 0, 0, .35);
  transition: transform .18s ease;
}
.wsp-flotante:hover { transform: scale(1.08); }
.wsp-flotante:focus-visible { outline: 3px solid var(--wsp); outline-offset: 3px; }

/* ---------- aparición al hacer scroll ---------- */
.rvl {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.rvl.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rvl, .hero-anim { opacity: 1; transform: none; transition: none; animation: none; }
  .boton, .tarjeta, .wsp-flotante { transition: none; }
}

/* ---------- pantallas chicas ---------- */
@media (max-width: 1080px) {
  .tarjetas-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .tarjetas, .pasos { grid-template-columns: 1fr; }
  .tarjetas-4 { grid-template-columns: repeat(2, 1fr); }
  .dos-col { grid-template-columns: 1fr; }
  .contacto-grilla { grid-template-columns: 1fr; }
  .logos { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .obras-grilla { grid-template-columns: 1fr; }
  .galeria { grid-auto-rows: 190px; }

  .barra-menu-btn { display: flex; }
  .barra-nav {
    position: fixed;
    top: 64px;
    right: 12px;
    left: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(20, 11, 14, .97);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: var(--radio);
    padding: 14px;
    display: none;
  }
  .barra-nav.abierto { display: flex; }
  .barra-nav a { padding: .7em .9em; border-radius: 8px; }
  .barra-nav a:hover { background: rgba(255, 255, 255, .08); }
  .barra-tel { text-align: center; margin-top: 6px; }
  .barra { background: rgba(20, 11, 14, .93); }
}

@media (max-width: 620px) {
  .tarjetas-4 { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .logos { grid-template-columns: repeat(2, 1fr); }
  .dato-fuerte { font-size: 1.7rem; }
  .hero-cta .boton { width: 100%; justify-content: center; }
  .pie-red { margin-left: 0; }
}