/* COS Ingeniería — plano técnico sobre acero: tinta azul, lámina galvanizada y una chispa */
@font-face { font-family: "Barlow"; src: url("/fuentes/barlow-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Barlow"; src: url("/fuentes/barlow-500.woff2") format("woff2"); font-weight: 500 600; font-display: swap; }
@font-face { font-family: "Barlow Condensed"; src: url("/fuentes/barlow-condensed-500.woff2") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Barlow Condensed"; src: url("/fuentes/barlow-condensed-600.woff2") format("woff2"); font-weight: 600 700; font-display: swap; }

:root {
  --tinta: #0B1F3A;
  --tinta-2: #12305C;
  --azul: #1E55B5;
  --azul-claro: #6FA0FF;
  --chispa: #FFB21F;
  --galvan: #EDF0F3;
  --galvan-2: #DEE3E8;
  --papel: #FFFFFF;
  --acero: #5E6B7A;
  --linea: rgba(11, 31, 58, .14);
  --plano: rgba(111, 160, 255, .13);
  --ancho: 1140px;
  --margen: clamp(16px, 4vw, 40px);
  --radio: 6px;
  --condensada: "Barlow Condensed", "Arial Narrow", sans-serif;
  --texto: "Barlow", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0; background: var(--galvan); color: var(--tinta);
  font-family: var(--texto); font-size: 1.0625rem; line-height: 1.55;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--azul); text-underline-offset: .18em; }
a:hover { color: var(--tinta-2); }
:focus-visible { outline: 3px solid var(--chispa); outline-offset: 3px; border-radius: 3px; }
h1, h2, h3 { margin: 0; font-family: var(--condensada); font-weight: 600; line-height: 1.05; letter-spacing: .005em; }
h2 { font-size: clamp(2.1rem, 4.2vw, 3rem); }
h3 { font-size: 1.5rem; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
dl, dd, dt { margin: 0; }
.ancho { max-width: var(--ancho); margin: 0 auto; padding: 0 var(--margen); }

.saltar { position: absolute; left: -999px; top: 8px; background: var(--chispa); color: var(--tinta); padding: 8px 14px; border-radius: 4px; z-index: 30; }
.saltar:focus { left: 8px; }

/* Botones */
.boton {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  min-height: 50px; padding: .65em 1.5em; border-radius: var(--radio); border: 2px solid var(--chispa);
  background: var(--chispa); color: var(--tinta); font: 600 1.125rem/1.2 var(--condensada); letter-spacing: .02em;
  text-decoration: none; cursor: pointer; transition: transform .15s, background-color .15s, border-color .15s, color .15s;
}
.boton:hover { background: #FFC24A; border-color: #FFC24A; color: var(--tinta); transform: translateY(-1px); }
.boton:active { transform: translateY(0); }
.boton--linea { background: transparent; color: var(--papel); border-color: rgba(255, 255, 255, .35); }
.boton--linea:hover { background: rgba(255, 255, 255, .08); color: var(--papel); border-color: var(--papel); }
.boton--chico { min-height: 42px; padding: .4em 1.1em; font-size: 1.0625rem; }
.boton--ancho { width: 100%; }

/* Encabezado */
.cabeza {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px var(--margen); color: var(--papel);
  background: rgba(11, 31, 58, 0); border-bottom: 1px solid transparent;
  transition: background-color .25s, border-color .25s;
}
.cabeza--solida { background: rgba(11, 31, 58, .92); border-bottom-color: rgba(111, 160, 255, .2); backdrop-filter: blur(8px); }
.marca { display: inline-flex; align-items: center; gap: 10px; color: inherit; text-decoration: none; }
.marca__logo { height: 52px; width: auto; flex: none; }
.menu { display: flex; gap: clamp(14px, 2.5vw, 32px); }
.menu a { color: inherit; text-decoration: none; font-weight: 500; opacity: .85; padding: 6px 0; border-bottom: 2px solid transparent; }
.menu a:hover { opacity: 1; border-bottom-color: var(--chispa); }

/* Portada */
.portada {
  position: relative; isolation: isolate; overflow: hidden;
  margin-top: -70px; padding: 120px var(--margen) 72px;
  background: var(--tinta); color: var(--papel);
}
.portada__cuerpo {
  max-width: var(--ancho); margin: 0 auto;
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: clamp(24px, 5vw, 72px); align-items: center;
}
.portada__fondo {
  position: absolute; inset: -80px; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(var(--plano) 1px, transparent 1px),
    linear-gradient(90deg, var(--plano) 1px, transparent 1px),
    linear-gradient(rgba(111, 160, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 160, 255, .06) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  background-position: -1px -1px;
  mask-image: radial-gradient(ellipse 80% 90% at 60% 50%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 90% at 60% 50%, #000 40%, transparent 100%);
  transition: transform .4s ease-out;
}
.portada__texto { max-width: 600px; }
.portada__ante { font: 500 1rem/1.3 var(--texto); color: var(--azul-claro); margin-bottom: 18px; }
.portada h1 { font-size: clamp(2.75rem, 6.2vw, 4.75rem); max-width: 11em; }
.portada__entrada { font-size: 1.1875rem; max-width: 34em; margin: 22px 0 28px; color: rgba(255, 255, 255, .86); }
.portada__acciones { display: flex; flex-wrap: wrap; gap: 12px; }
.portada__datos { display: flex; flex-wrap: wrap; gap: 8px 36px; margin-top: 36px; padding-top: 22px; border-top: 1px solid rgba(111, 160, 255, .25); }
.portada__datos dt { font-size: .8125rem; color: var(--azul-claro); }
.portada__datos dd { font: 600 1.125rem/1.2 var(--condensada); letter-spacing: .02em; }

/* El plano del conector roscado */
.portada__plano { margin: 0; justify-self: center; width: min(100%, 420px); }
.plano { width: 100%; height: auto; overflow: visible; }
.plano__trazo path { fill: none; stroke: var(--papel); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; animation: trazar 1.1s cubic-bezier(.4, 0, .2, 1) forwards; }
.plano__trazo .t1 { animation-delay: .2s; }
.plano__trazo .t2 { animation-delay: .4s; animation-duration: 1.4s; }
.plano__trazo .t3 { animation-delay: 1.1s; }
.plano__trazo .t4 { animation-delay: 1.4s; }
.plano__trazo .t5 { animation-delay: 1.5s; }
.plano__trazo .t6 { animation-delay: 1.8s; animation-duration: 1.3s; }
.plano__trazo .t7 { animation-delay: 2.2s; }
.plano__trazo .t8 { animation-delay: 2.4s; }
.plano__cotas { opacity: 0; animation: aparecer .6s ease-out 3s forwards; }
.plano__cotas path { fill: none; stroke: var(--azul-claro); stroke-width: 1; stroke-linejoin: round; stroke-linecap: round; }
.plano__cotas text { fill: var(--azul-claro); font: 500 12px/1 var(--texto); letter-spacing: .04em; }
.plano__centro { text-anchor: middle; }
.plano__vertical { text-anchor: middle; transform-box: fill-box; transform-origin: center; transform: rotate(-90deg); }
.plano__cotas .plano__oculta { stroke-dasharray: 6 4; opacity: .7; }
.plano__trazo .t7 { stroke: var(--azul-claro); }
.plano__chispa { fill: none; stroke: var(--chispa); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; opacity: 0; filter: drop-shadow(0 0 6px var(--chispa)); animation: chispear 2.8s steps(1, end) 3.2s infinite; }

@keyframes trazar { to { stroke-dashoffset: 0; } }
@keyframes aparecer { to { opacity: 1; } }
@keyframes chispear {
  0%, 100% { opacity: 0; }
  3% { opacity: 1; }
  6% { opacity: 0; }
  8% { opacity: 1; }
  14% { opacity: 0; }
  40% { opacity: 1; }
  43% { opacity: 0; }
  45% { opacity: 1; }
  70% { opacity: 1; }
  72% { opacity: 0; }
}
.sube { opacity: 0; transform: translateY(18px); animation: subir .7s cubic-bezier(.2, .7, .2, 1) forwards; }
.portada__texto .sube:nth-child(1) { animation-delay: .1s; }
.portada__texto .sube:nth-child(2) { animation-delay: .25s; }
.portada__texto .sube:nth-child(3) { animation-delay: .45s; }
.portada__texto .sube:nth-child(4) { animation-delay: .6s; }
.portada__texto .sube:nth-child(5) { animation-delay: .8s; }
@keyframes subir { to { opacity: 1; transform: none; } }

/* Secciones */
section { padding: clamp(56px, 9vw, 112px) 0; }
.servicios__cabeza { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 24px clamp(24px, 5vw, 72px); align-items: end; margin-bottom: clamp(32px, 5vw, 56px); }
.servicios__cabeza p { margin: 0; color: var(--acero); max-width: 38em; }
.fichas { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--linea); border-left: 1px solid var(--linea); }
.ficha { display: flex; flex-direction: column; gap: 14px; padding: clamp(22px, 3vw, 34px); background: var(--papel); border-right: 1px solid var(--linea); border-bottom: 1px solid var(--linea); }
.ficha__icono { width: 48px; height: 48px; flex: none; fill: none; stroke: var(--azul); stroke-width: 1.75; stroke-linejoin: round; stroke-linecap: round; }
.ficha h3 { margin-bottom: 8px; }
.ficha p { margin: 0; color: var(--acero); }

.respaldo { background: var(--tinta); color: var(--papel); }
.respaldo__cuerpo { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: clamp(32px, 6vw, 96px); align-items: start; }
.respaldo__texto h2 { margin-bottom: 22px; }
.respaldo__texto p { color: rgba(255, 255, 255, .86); max-width: 36em; }
.tabla { border-top: 1px solid rgba(111, 160, 255, .3); }
.tabla div { display: grid; grid-template-columns: 9em minmax(0, 1fr); gap: 16px; padding: 16px 0; border-bottom: 1px solid rgba(111, 160, 255, .3); }
.tabla dt { font: 600 1.0625rem/1.3 var(--condensada); letter-spacing: .03em; color: var(--azul-claro); }
.tabla dd { color: rgba(255, 255, 255, .92); }

.proceso h2 { margin-bottom: clamp(28px, 4vw, 48px); }
.pasos { position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; counter-reset: paso; }
.pasos__linea { display: none; }
.paso { position: relative; padding-top: 22px; border-top: 2px solid var(--galvan-2); counter-increment: paso; }
.paso::before { content: counter(paso, decimal-leading-zero); display: block; font: 600 2.25rem/1 var(--condensada); color: var(--azul); margin-bottom: 10px; }
.paso::after { content: ""; position: absolute; left: 0; top: -2px; height: 2px; width: 0; background: var(--azul); transition: width .6s cubic-bezier(.2, .7, .2, 1); }
.paso--visto::after { width: 100%; }
.paso h3 { margin-bottom: 8px; }
.paso p { margin: 0; color: var(--acero); }

.industrias { padding-top: 0; }
.industrias h2 { margin-bottom: 24px; }
.giros { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0 32px; border-top: 1px solid var(--linea); }
.giros li { display: flex; flex-direction: column; gap: 6px; padding: 20px 0; border-bottom: 1px solid var(--linea); }
.giros strong { font: 600 1.375rem/1.1 var(--condensada); letter-spacing: .02em; }
.giros span { color: var(--acero); }

.contacto { background: var(--papel); border-top: 1px solid var(--linea); }
.contacto__cuerpo { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(32px, 6vw, 96px); align-items: start; }
.contacto__texto p { color: var(--acero); max-width: 32em; }
.contacto__vias { margin-top: 28px; border-top: 1px solid var(--linea); }
.contacto__vias li { display: grid; grid-template-columns: 11em minmax(0, 1fr); gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--linea); }
.contacto__vias span { color: var(--acero); }
.contacto__vias a { font-weight: 500; }
.formulario { background: var(--galvan); padding: clamp(20px, 3vw, 32px); border: 1px solid var(--linea); border-radius: var(--radio); }
.campo { margin-bottom: 16px; }
.campo label { display: block; font-weight: 500; margin-bottom: 6px; }
.campo input, .campo select, .campo textarea {
  width: 100%; padding: 12px 14px; border: 1px solid #B9C2CC; border-radius: var(--radio); background: var(--papel);
  font: 400 1.0625rem/1.4 var(--texto); color: var(--tinta);
}
.campo textarea { resize: vertical; min-height: 110px; }
.campo input:focus, .campo select:focus, .campo textarea:focus { outline: 2px solid var(--azul); outline-offset: 0; border-color: var(--azul); }
.campo--falta input { border-color: #C0392B; }
.formulario__nota { margin: 12px 0 0; font-size: .9375rem; color: var(--acero); }

/* Trabajos recientes */
.trabajos { padding-top: 0; }
.trabajos__cabeza { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 12px 40px; margin-bottom: 28px; }
.trabajos__cabeza p { margin: 0; color: var(--acero); max-width: 32em; }
.rejilla { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); grid-auto-rows: 150px; grid-auto-flow: dense; gap: 12px; }
.trabajo { position: relative; grid-column: span 2; grid-row: span 2; margin: 0; border-radius: var(--radio); overflow: hidden; background: var(--tinta); }
.trabajo--ancha { grid-column: span 4; }
.trabajo--alta { grid-row: span 3; }
.trabajo__boton { display: block; width: 100%; height: 100%; padding: 0; border: 0; background: none; cursor: zoom-in; }
.trabajo__boton img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s cubic-bezier(.2, .7, .2, 1); }
.trabajo__boton:hover img, .trabajo__boton:focus-visible img { transform: scale(1.04); }
.trabajo__boton:focus-visible { outline-offset: -3px; }
.trabajo__pie {
  position: absolute; left: 0; right: 0; bottom: 0; margin: 0; padding: 28px 14px 10px; pointer-events: none;
  color: var(--papel); font: 500 1.0625rem/1.25 var(--condensada); letter-spacing: .02em;
  background: linear-gradient(transparent, rgba(11, 31, 58, .88));
}

.visor { width: min(1100px, 94vw); max-height: 94vh; padding: 0; border: 0; border-radius: var(--radio); background: var(--tinta); color: var(--papel); overflow: visible; }
.visor::backdrop { background: rgba(6, 14, 28, .86); }
.visor[open] { animation: visor-entra .22s ease-out; }
@keyframes visor-entra { from { opacity: 0; transform: scale(.97); } }
.visor__figura { margin: 0; }
.visor__figura img { width: 100%; max-height: 80vh; object-fit: contain; background: #000; border-radius: var(--radio) var(--radio) 0 0; }
.visor__figura figcaption { padding: 12px 16px; font: 500 1.125rem/1.3 var(--condensada); letter-spacing: .02em; }
.visor__cerrar, .visor__flecha {
  position: absolute; display: grid; place-items: center; width: 44px; height: 44px; border: 0; border-radius: 50%;
  background: var(--chispa); color: var(--tinta); font: 600 1.75rem/1 var(--texto); cursor: pointer;
}
.visor__cerrar { top: -14px; right: -14px; }
.visor__flecha { top: 50%; transform: translateY(-50%); }
.visor__flecha--ant { left: -14px; }
.visor__flecha--sig { right: -14px; }

.pie__redes { display: flex; gap: 20px; }
.pie__redes a { font-weight: 500; }

/* Pie */
.pie { background: var(--tinta); color: rgba(255, 255, 255, .8); padding: 40px 0; }
.pie__cuerpo { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px; align-items: end; }
.pie p { margin: 0; }
.pie__marca img { width: 360px; height: auto; }
.pie__legal, .pie__firma { font-size: .9375rem; }
.pie a { color: var(--chispa); }

/* WhatsApp flotante */
.flotante {
  position: fixed; right: 16px; bottom: 16px; z-index: 20;
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px 12px 14px; border-radius: 999px;
  background: #25D366; color: #fff; font: 600 1.0625rem/1 var(--condensada); letter-spacing: .03em; text-decoration: none;
  box-shadow: 0 8px 24px rgba(11, 31, 58, .3);
}
.flotante svg { width: 24px; height: 24px; fill: currentColor; }
.flotante[hidden] { display: none; }

/* 404 */
.perdida { min-height: 100vh; display: grid; place-content: center; text-align: center; gap: 16px; padding: var(--margen); background: var(--tinta); color: var(--papel); }
.perdida h1 { font-size: clamp(2.25rem, 6vw, 3.5rem); }
.perdida .marca { justify-content: center; }
.perdida .marca__logo { height: 80px; }

/* Pantallas medianas y chicas */
@media (max-width: 960px) {
  .portada { padding-top: 104px; }
  .portada__cuerpo { grid-template-columns: 1fr; }
  .portada__plano { width: min(100%, 340px); justify-self: start; }
  .servicios__cabeza, .respaldo__cuerpo, .contacto__cuerpo { grid-template-columns: 1fr; }
  .fichas { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rejilla { grid-template-columns: repeat(4, minmax(0, 1fr)); grid-auto-rows: 130px; }
  .pasos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .menu { display: none; }
  .cabeza .boton { display: none; }
  .cabeza { padding-block: 10px; }
  .marca__logo { height: 44px; }
  .pie__marca img { width: 300px; }
  .fichas { grid-template-columns: 1fr; }
  .ficha { flex-direction: row; gap: 18px; }
  .rejilla { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows: 120px; gap: 8px; }
  .trabajo, .trabajo--alta { grid-column: span 1; grid-row: span 2; }
  .trabajo--ancha { grid-column: span 2; grid-row: span 2; }
  .trabajo:last-child { grid-column: span 2; }
  .trabajo__pie { font-size: .9375rem; padding: 22px 10px 8px; }
  .visor__cerrar { top: 8px; right: 8px; }
  .visor__flecha--ant { left: 8px; }
  .visor__flecha--sig { right: 8px; }
  .pasos { grid-template-columns: 1fr; }
  .tabla div, .contacto__vias li { grid-template-columns: 1fr; gap: 4px; }
  .portada__datos { gap: 12px 24px; }
  .portada__plano { width: min(100%, 260px); margin-top: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .plano__trazo path, .plano__cotas, .sube { animation: none; opacity: 1; transform: none; stroke-dashoffset: 0; }
  .plano__chispa { animation: none; opacity: 1; }
  .portada__fondo { transition: none; }
  .paso::after { transition: none; }
  .trabajo__boton img { transition: none; }
  .visor[open] { animation: none; }
}