/* =====================================================
   L.B. Ingeniería Eléctrica C.A.
   Estética: plano técnico eléctrico (diagrama unifilar)
   Mobile-first · Animaciones con reduced-motion
   ===================================================== */

:root {
  --tinta: #14222c;        /* azul-grafito, tinta de plano */
  --tinta-suave: #47606f;  /* acero, texto secundario */
  --papel: #eff2f1;        /* papel técnico frío */
  --papel-alto: #f9fbfa;   /* tarjetas */
  --azul: #1b9cd8;         /* azul del logotipo */
  --azul-osc: #1480b5;
  --azul-claro: #55bce8;   /* para texto pequeño sobre fondo oscuro */
  --linea: rgba(20, 34, 44, 0.16);
  --grid-line: rgba(20, 34, 44, 0.05);

  --f-display: "Archivo", "Arial Black", sans-serif;
  --f-body: "Barlow", "Segoe UI", sans-serif;
  --f-mono: "IBM Plex Mono", Consolas, monospace;

  --header-h: 4.25rem;
  --radius: 3px;
  --dur: 0.55s;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  font-family: var(--f-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--tinta);
  background-color: var(--papel);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

abbr { text-decoration: none; }

:focus-visible {
  outline: 3px solid var(--azul);
  outline-offset: 2px;
}

.container {
  width: min(100% - 2.5rem, 68rem);
  margin-inline: auto;
}

/* ---------- Botones ---------- */

.btn {
  display: inline-block;
  font-family: var(--f-display);
  font-variation-settings: "wdth" 110;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.9rem 1.5rem;
  border: 2px solid var(--tinta);
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background-color 0.2s;
}

.btn-primary {
  background: var(--azul);
  color: var(--tinta);
  box-shadow: 4px 4px 0 var(--tinta);
}

.btn-primary:hover {
  background: var(--azul-osc);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--tinta);
}

.btn-primary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--tinta);
}

.btn-ghost {
  background: transparent;
  color: var(--tinta);
}

.btn-ghost:hover { background: rgba(20, 34, 44, 0.07); }

/* ---------- Cabecera ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--papel) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background-color 0.3s;
}

.site-header.scrolled { border-bottom-color: var(--linea); }

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-logo {
  height: 3.1rem;
  width: auto;
  /* funde el fondo blanco del JPG con el papel de la cabecera */
  mix-blend-mode: multiply;
}

.brand-name {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 115;
  font-weight: 700;
  font-size: 0.78rem;
  line-height: 1.15;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Navegación: panel deslizante en móvil */

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0 0.55rem;
  background: transparent;
  border: 2px solid var(--tinta);
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle-bar {
  height: 2px;
  background: var(--tinta);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

body.nav-open .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  /* El backdrop-filter de la cabecera la convierte en bloque contenedor:
     la altura debe fijarse explícitamente respecto al viewport. */
  position: fixed;
  top: var(--header-h);
  right: 0;
  height: calc(100dvh - var(--header-h));
  width: min(20rem, 85vw);
  background: var(--tinta);
  color: var(--papel);
  padding: 2.5rem 2rem;
  transform: translateX(105%);
  transition: transform 0.4s var(--ease), visibility 0.4s;
  visibility: hidden;
}

body.nav-open .site-nav {
  transform: translateX(0);
  visibility: visible;
}

body.nav-open { overflow: hidden; }

.site-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}

.site-nav a {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 110;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.2s;
}

.site-nav a:hover, .site-nav a.active { color: var(--azul-claro); }

.site-nav .nav-cta {
  display: inline-block;
  color: var(--tinta);
  background: var(--azul);
  border-radius: var(--radius);
  padding: 0.55rem 1rem;
}

.site-nav .nav-cta:hover { color: var(--tinta); background: var(--azul-osc); }

/* ---------- Hero ---------- */

.hero {
  padding-top: calc(var(--header-h) + 3rem);
  padding-bottom: 3.5rem;
  border-bottom: 2px solid var(--tinta);
}

.hero-grid {
  display: grid;
  gap: 2.75rem;
}

.eyebrow {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 120;
  font-weight: 900;
  font-size: clamp(2.15rem, 8vw, 3.9rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  text-transform: uppercase;
}

.lead {
  max-width: 34rem;
  font-size: 1.1rem;
  color: var(--tinta-suave);
  margin-top: 1.4rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.hero-cert {
  max-width: 34rem;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  border-left: 4px solid var(--azul);
  padding-left: 0.85rem;
  margin-top: 2rem;
}

/* Diagrama unifilar */

.hero-diagram { margin-inline: auto; width: 100%; max-width: 40rem; }

.hero-diagram svg { width: 100%; height: auto; }

.hero-diagram .draw {
  stroke: var(--tinta);
  stroke-width: 2.5;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: dibujar 0.7s var(--ease) forwards;
  animation-delay: calc(0.35s + var(--d, 0) * 0.22s);
}

.hero-diagram .bus { stroke-width: 6; }

.hero-diagram .arrow { fill: var(--tinta); fill-opacity: 0; animation-name: dibujar-relleno; }

.svg-label {
  font-family: var(--f-mono);
  font-size: 12px;
  fill: var(--tinta);
  opacity: 0;
  animation: aparecer 0.6s ease forwards 1.3s;
}

.svg-label-lg { font-size: 15px; font-weight: 500; }

.svg-label-dim { fill: var(--tinta-suave); font-size: 10.5px; }

.svg-code { fill: var(--tinta-suave); font-size: 10.5px; }

.pulse {
  fill: var(--azul);
  stroke: var(--tinta);
  stroke-width: 1.5;
}

@keyframes dibujar { to { stroke-dashoffset: 0; } }

@keyframes dibujar-relleno {
  to { stroke-dashoffset: 0; fill-opacity: 1; }
}

@keyframes aparecer { to { opacity: 1; } }

/* Secuencia de entrada del hero */

.hero-seq {
  opacity: 0;
  transform: translateY(18px);
  animation: entrada 0.8s var(--ease) forwards;
  animation-delay: calc(var(--seq, 0) * 0.13s);
}

@keyframes entrada {
  to { opacity: 1; transform: none; }
}

/* Estadísticas */

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 3rem;
  background: var(--tinta);
  border: 2px solid var(--tinta);
  border-radius: var(--radius);
  overflow: hidden;
}

.stat {
  background: var(--papel-alto);
  padding: 1.1rem 1.2rem 1.2rem;
}

.stat dt {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  margin-bottom: 0.25rem;
}

.stat dd {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 115;
  font-weight: 900;
  font-size: 2.1rem;
  line-height: 1;
}

.stat-text { font-size: 1.45rem; padding-top: 0.35rem; }

/* ---------- Secciones ---------- */

.section { padding-block: 4.5rem; }

.section-dark {
  background: var(--tinta);
  color: var(--papel);
  background-image:
    linear-gradient(rgba(239, 242, 241, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(239, 242, 241, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
}

/* Cajetín de plano como título de sección */

.title-block {
  display: inline-flex;
  align-items: stretch;
  border: 2px solid currentColor;
  border-radius: var(--radius);
  margin-bottom: 1.75rem;
  overflow: hidden;
}

.title-block-code {
  display: grid;
  place-items: center;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 0.55rem 0.8rem;
  background: var(--azul);
  color: var(--tinta);
  border-right: 2px solid var(--tinta);
}

.section-dark .title-block { border-color: var(--papel); }

.title-block h2 {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 115;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.55rem 1rem;
}

.section-lead {
  max-width: 38rem;
  color: var(--tinta-suave);
  margin-bottom: 2.5rem;
}

.section-dark .section-lead { color: rgba(239, 242, 241, 0.72); }

.big-text {
  font-size: 1.35rem;
  line-height: 1.45;
  font-weight: 500;
  letter-spacing: -0.01em;
}

/* ---------- Empresa ---------- */

.section-grid { display: grid; gap: 2.5rem; }

.empresa-logo {
  width: min(15rem, 70%);
  height: auto;
  margin-top: 2rem;
  mix-blend-mode: multiply;
}

.registro {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--tinta-suave);
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--linea);
}

.mv-cards { display: grid; gap: 1.25rem; }

.card {
  background: var(--papel-alto);
  border: 2px solid var(--tinta);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 5px 5px 0 rgba(20, 34, 44, 0.1);
}

.card h3 {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 115;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  padding-left: 0.85rem;
  border-left: 4px solid var(--azul);
}

.card p { color: var(--tinta-suave); }

.values {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2.5rem;
}

.values li {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.45rem 0.9rem;
  border: 1.5px solid var(--tinta);
  border-radius: 99px;
  transition: background-color 0.2s, color 0.2s;
}

.values li:hover { background: var(--tinta); color: var(--azul-claro); }

/* ---------- Servicios ---------- */

.services-grid { display: grid; gap: 1.25rem; }

.service {
  border: 1.5px solid rgba(239, 242, 241, 0.28);
  border-radius: var(--radius);
  padding: 1.6rem;
  background: rgba(239, 242, 241, 0.03);
  transition: border-color 0.25s, transform 0.25s var(--ease), background-color 0.25s;
}

.service:hover {
  border-color: var(--azul);
  background: rgba(239, 242, 241, 0.05);
  transform: translateY(-4px);
}

.service-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 1.1rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px dashed rgba(239, 242, 241, 0.25);
}

.service-code {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--azul-claro);
}

.service h3 {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 115;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.service ul { list-style: none; }

.service li {
  position: relative;
  padding-left: 1.3rem;
  margin-bottom: 0.5rem;
  color: rgba(239, 242, 241, 0.78);
  font-size: 0.98rem;
}

.service li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.6rem;
  height: 2px;
  background: var(--azul);
}

.service-featured { border-color: var(--azul); }

/* Flota de maquinaria y certificación */

.fleet {
  margin-top: 1.25rem;
  border: 1.5px dashed rgba(239, 242, 241, 0.28);
  border-radius: var(--radius);
  padding: 1.6rem;
  display: grid;
  gap: 1.5rem;
}

.fleet-img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1.5px solid rgba(239, 242, 241, 0.28);
}

.fleet h3 {
  font-family: var(--f-display);
  font-variation-settings: "wdth" 115;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.fleet p {
  color: rgba(239, 242, 241, 0.78);
  font-size: 0.98rem;
  max-width: 44rem;
  margin-bottom: 1.1rem;
}

.fleet-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.fleet-chips li {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.45rem 0.9rem;
  border: 1.5px solid rgba(239, 242, 241, 0.4);
  border-radius: 99px;
  transition: border-color 0.2s, color 0.2s;
}

.fleet-chips li:hover { border-color: var(--azul-claro); color: var(--azul-claro); }

.cert-strip {
  margin-top: 2rem;
  max-width: 44rem;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: rgba(239, 242, 241, 0.85);
  border-left: 4px solid var(--azul);
  padding-left: 1rem;
}

/* ---------- Obras (bitácora) ---------- */

.worklog {
  list-style: none;
  border-top: 2px solid var(--tinta);
}

.worklog-row {
  display: grid;
  gap: 0.2rem 1.5rem;
  padding: 1.1rem 0.25rem;
  border-bottom: 1px solid var(--linea);
  transition: background-color 0.2s, padding-left 0.25s var(--ease);
}

.worklog-row:hover {
  background: var(--papel-alto);
  padding-left: 0.85rem;
}

.worklog-year {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--tinta-suave);
}

.worklog-name { font-weight: 600; }

.worklog-place {
  font-size: 0.9rem;
  color: var(--tinta-suave);
}

/* Galería de obra */

.obra-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  margin-top: 2.75rem;
}

.obra-gallery figure {
  border: 2px solid var(--tinta);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--papel-alto);
}

.obra-gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}

.obra-gallery figure:hover img { transform: scale(1.04); }

.obra-gallery figcaption {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  padding: 0.55rem 0.75rem;
  border-top: 1px solid var(--linea);
  background: var(--papel-alto);
  position: relative;
}

/* ---------- Clientes ---------- */

.clients-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--linea);
  border: 2px solid var(--tinta);
  border-radius: var(--radius);
  overflow: hidden;
}

.client {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  text-align: center;
  background: var(--papel-alto);
  padding: 1.4rem 1.2rem;
  min-height: 8rem;
  transition: background-color 0.25s;
}

.client:hover { background: #e7f3fa; }

.client img {
  height: 3.4rem;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.client span {
  font-size: 0.78rem;
  color: var(--tinta-suave);
}

.clients-history {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  color: var(--tinta-suave);
  margin-top: 1.5rem;
}

/* ---------- Contacto ---------- */

.contact-cta {
  max-width: 42rem;
  margin-top: 2.5rem;
}

.contact-cta .big-text { margin-bottom: 2rem; }

.btn-email {
  text-transform: none;
  letter-spacing: 0.01em;
  font-variation-settings: "wdth" 105;
  font-size: clamp(1rem, 4.2vw, 1.35rem);
  padding: 1.1rem 1.6rem;
  overflow-wrap: anywhere;
  border-color: var(--papel);
  box-shadow: 4px 4px 0 var(--papel);
}

.btn-email:hover { box-shadow: 6px 6px 0 var(--papel); }

.btn-email:active { box-shadow: 1px 1px 0 var(--papel); }

.contact-tagline {
  font-size: 0.95rem;
  color: rgba(239, 242, 241, 0.65);
  margin-top: 1.75rem;
}


/* ---------- Pie ---------- */

.site-footer {
  background: var(--tinta);
  color: rgba(239, 242, 241, 0.65);
  border-top: 1px solid rgba(239, 242, 241, 0.15);
  padding-block: 1.6rem;
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-social {
  list-style: none;
  display: flex;
  gap: 1.25rem;
}

.footer-social a {
  color: var(--papel);
  text-decoration-color: var(--azul);
  text-underline-offset: 3px;
}

.footer-social a:hover { color: var(--azul-claro); }

/* ---------- Revelado al hacer scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  transition-delay: var(--rd, 0s);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ---------- Escritorio ---------- */

@media (min-width: 40em) {
  .stats { grid-template-columns: repeat(4, 1fr); }
  .mv-cards { grid-template-columns: 1fr 1fr; }
  .services-grid { grid-template-columns: 1fr 1fr; }
  .service-featured { grid-column: 1 / -1; }
  .service-featured ul { columns: 2; column-gap: 2.5rem; }
  .service-featured li { break-inside: avoid; }
  .clients-grid { grid-template-columns: repeat(4, 1fr); }
  .obra-gallery { grid-template-columns: repeat(3, 1fr); }
  .fleet { grid-template-columns: 1.15fr 0.85fr; align-items: center; }
  .worklog-row { grid-template-columns: 7.5rem 1fr 14rem; align-items: baseline; }
  .footer-inner { flex-direction: row; justify-content: space-between; align-items: center; }
}

@media (min-width: 60em) {
  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    color: inherit;
    padding: 0;
    transform: none;
    visibility: visible;
    transition: none;
  }

  .site-nav ul {
    flex-direction: row;
    align-items: center;
    gap: 1.75rem;
  }

  .site-nav a {
    font-size: 0.82rem;
    letter-spacing: 0.08em;
    position: relative;
  }

  .site-nav a:not(.nav-cta)::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 100%;
    height: 2.5px;
    background: var(--azul);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s var(--ease);
  }

  .site-nav a:not(.nav-cta):hover::after,
  .site-nav a.active:not(.nav-cta)::after { transform: scaleX(1); }

  .site-nav a:hover, .site-nav a.active { color: inherit; }

  .site-nav .nav-cta {
    border: 2px solid var(--tinta);
    padding: 0.5rem 1rem;
    box-shadow: 3px 3px 0 var(--tinta);
    transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
  }

  .site-nav .nav-cta:hover {
    transform: translate(-1px, -1px);
    box-shadow: 4px 4px 0 var(--tinta);
  }

  .hero { padding-top: calc(var(--header-h) + 5rem); padding-bottom: 4.5rem; }

  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 3.5rem;
  }

  .section { padding-block: 6.5rem; }

  .section-grid { grid-template-columns: 5fr 6fr; gap: 3.5rem; }
}

/* ---------- Movimiento reducido ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .hero-seq,
  .hero-diagram .draw,
  .svg-label {
    animation: none;
    opacity: 1;
    transform: none;
    stroke-dashoffset: 0;
  }

  .hero-diagram .arrow { fill-opacity: 1; }

  .pulse { display: none; }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn, .service, .worklog-row, .site-nav { transition: none; }
}