/* ============================================================
   ESTILOS.CSS — Plantilla para SEIYA INGENEIRIA
   Estructura: Variables → Reset → Layout → Componentes → Páginas
   ============================================================ */

/* ── VARIABLES GLOBALES ─────────────────────────────────── */
:root {
  --negro:        #0a0a0a;
  --gris-oscuro:  #141414;
  --gris-medio:   #2a2a2a;
  --gris-suave:   #888;
  --blanco:       #ffffff;
  --blanco-apagado: #f5f5f3;

  --acento:       #d4a843;       /* Dorado principal */
  --acento-dk:    #b8912e;       /* Dorado hover */
  --acento-lt:    rgba(212,168,67,.12);

  --fuente-titulo: 'Playfair Display', Georgia, serif;
  --fuente-cuerpo: 'DM Sans', sans-serif;

  --nav-h:        80px;
  --max-ancho:    1280px;
  --transicion:   0.35s cubic-bezier(.4,0,.2,1);
  --sombra:       0 20px 60px rgba(0,0,0,.3);
}

/* ── RESET ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  text-align: center;
  font-family: var(--fuente-cuerpo);
  background: var(--negro);
  color: var(--blanco);
  line-height: 1.6;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ── UTILIDADES ─────────────────────────────────────────── */
.contenedor {
  width: 90%;
  max-width: var(--max-ancho);
  margin-inline: auto;
}
.etiqueta {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--acento);
  margin-bottom: .75rem;
}
.etiqueta::before {
  content: '— ';
}
.linea-acento {
  width: 48px; height: 2px;
  background: var(--acento);
  margin: 1.2rem 0;
}
.btn-primario {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .85rem 2rem;
  background: var(--acento);
  color: var(--negro);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: background var(--transicion), transform var(--transicion);
}
.btn-primario:hover {
  background: var(--acento-dk);
  transform: translateY(-2px);
}
.btn-borde {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .8rem 1.8rem;
  border: 1px solid rgba(255,255,255,.25);
  color: var(--blanco);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: border-color var(--transicion), background var(--transicion);
}
.btn-borde:hover {
  border-color: var(--acento);
  background: var(--acento-lt);
}

/* ── NAVEGACIÓN ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--transicion), box-shadow var(--transicion);
}
.nav.scrolled {
  background: rgba(10,10,10,.96);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,.06);
}
.nav__inner {
  width: 90%;
  max-width: var(--max-ancho);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-family: var(--fuente-titulo);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--blanco);
  letter-spacing: .04em;
}
.nav__logo span { color: var(--acento); }

.nav__menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav__menu a {
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.8);
  transition: color var(--transicion);
  position: relative;
}
.nav__menu a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--acento);
  transition: width var(--transicion);
}
.nav__menu a:hover { color: var(--blanco); }
.nav__menu a:hover::after { width: 100%; }

/* Dropdown */
.nav__item { position: relative; }
.nav__sub {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  background: var(--gris-oscuro);
  border-top: 2px solid var(--acento);
  padding: .5rem 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transicion), top var(--transicion);
}
.nav__item:hover .nav__sub {
  opacity: 1;
  pointer-events: all;
  top: calc(100% + 8px);
}
.nav__sub a {
  display: block;
  padding: .6rem 1.2rem;
  font-size: .78rem;
  color: rgba(255,255,255,.7);
}
.nav__sub a:hover { color: var(--acento); background: rgba(255,255,255,.04); }
.nav__sub a::after { display: none; }

/* Hamburger */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 26px;
  cursor: pointer;
}
.nav__burger span {
  display: block;
  width: 100%; height: 2px;
  background: var(--blanco);
  transition: transform var(--transicion), opacity var(--transicion);
}
.nav__burger.abierto span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.abierto span:nth-child(2) { opacity: 0; }
.nav__burger.abierto span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Menú móvil */
.nav__movil {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0; bottom: 0;
  background: var(--negro);
  padding: 2rem;
  flex-direction: column;
  gap: 1.2rem;
  z-index: 999;
  overflow-y: auto;
}
.nav__movil.visible { display: flex; }
.nav__movil a {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255,255,255,.8);
  padding: .6rem 0;
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: color var(--transicion);
}
.nav__movil a:hover { color: var(--acento); }

/* ── HERO ───────────────────────────────────────────────── */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.hero__media {
  position: absolute;
  inset: 0;
}
.hero__video {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero__imagen-fallback {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0,0,0,.85) 0%,
    rgba(0,0,0,.3) 50%,
    rgba(0,0,0,.1) 100%
  );
}
.hero__contenido {
  position: relative;
  z-index: 2;
  padding-bottom: 7rem;
  width: 90%;
  max-width: var(--max-ancho);
  margin-inline: auto;
}
.hero__subtitulo {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--acento);
  margin-bottom: 1rem;
}
.hero__titulo {
  font-family: var(--fuente-titulo);
  font-size: clamp(2.5rem, 6vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  max-width: 750px;
  margin-bottom: 1.5rem;
}
.hero__titulo em {
  font-style: italic;
  color: var(--acento);
}
.hero__desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,.7);
  max-width: 480px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}
.hero__acciones { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  right: 5%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  font-size: .68rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
  z-index: 2;
}
.hero__scroll-linea {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, rgba(255,255,255,.4), transparent);
  animation: scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ── SECCIÓN GENÉRICA ───────────────────────────────────── */
.seccion {
  padding: 7rem 0;
}
.seccion--oscura { background: var(--negro); }
.seccion--media  { background: var(--gris-oscuro); }
.seccion--clara  { background: var(--blanco-apagado); color: var(--negro); }

.seccion__cabecera {
  max-width: 680px;
  margin-bottom: 4rem;
}
.seccion__titulo {
  font-family: var(--fuente-titulo);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
}
.seccion__desc {
  margin-top: 1rem;
  font-size: 1rem;
  color: var(--gris-suave);
  line-height: 1.75;
  max-width: 560px;
}
.seccion--clara .seccion__desc { color: #555; }

/* ── GRID DE ÁREAS ──────────────────────────────────────── */
.areas__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5px;
  background: rgba(255,255,255,.06);
}
.area-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--gris-medio);
  cursor: pointer;
}
.area-card__imagen {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .7s var(--transicion);
  filter: brightness(.6);
}
.area-card:hover .area-card__imagen {
  transform: scale(1.06);
  filter: brightness(.4);
}
.area-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,.8) 0%, transparent 60%);
}
.area-card__contenido {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 2rem;
  transform: translateY(1rem);
  transition: transform var(--transicion);
}
.area-card:hover .area-card__contenido { transform: translateY(0); }
.area-card__numero {
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--acento);
  margin-bottom: .4rem;
}
.area-card__titulo {
  font-family: var(--fuente-titulo);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: .5rem;
}
.area-card__desc {
  font-size: .88rem;
  color: rgba(255,255,255,.7);
  line-height: 1.6;
  max-height: 0;
  overflow: hidden;
  transition: max-height .5s var(--transicion), opacity .4s;
  opacity: 0;
}
.area-card:hover .area-card__desc {
  max-height: 120px;
  opacity: 1;
}
.area-card__flecha {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--acento);
  margin-top: .8rem;
  opacity: 0;
  transition: opacity var(--transicion);
}
.area-card:hover .area-card__flecha { opacity: 1; }

/* ── ESTADÍSTICAS ───────────────────────────────────────── */
.estadisticas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.400);
  border-bottom: 1px solid rgba(255,255,255,.400);
  background: var(--gris-oscuro);
}
.estadistica {
  padding: 3rem 2rem;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,.08);
}
.estadistica:last-child { border-right: none; }
.estadistica__numero {
  font-family: var(--fuente-titulo);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--acento);
  display: block;
  line-height: 1;
  margin-bottom: .5rem;
}
.estadistica__label {
  font-size: .82rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.5);
}

/* ── PROYECTOS ──────────────────────────────────────────── */
.proyectos__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1px;
  background: rgba(255,255,255,.05);
}
.proyecto-card {
  position: relative;
  overflow: hidden;
  background: var(--gris-medio);
  aspect-ratio: 16/10;
  cursor: pointer;
}
.proyecto-card__imagen {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .6s var(--transicion);
  filter: brightness(.65);
}
.proyecto-card:hover .proyecto-card__imagen {
  transform: scale(1.04);
  filter: brightness(.45);
}
.proyecto-card__info {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.8rem;
  background: linear-gradient(to top, rgba(0,0,0,.75) 0%, transparent 65%);
}
.proyecto-card__tipo {
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--acento);
  margin-bottom: .4rem;
}
.proyecto-card__nombre {
  font-family: var(--fuente-titulo);
  font-size: 1.2rem;
  font-weight: 700;
}
.proyecto-card__link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .78rem;
  color: rgba(255,255,255,.6);
  margin-top: .5rem;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--transicion), transform var(--transicion);
}
.proyecto-card:hover .proyecto-card__link {
  opacity: 1;
  transform: translateY(0);
}

/* ── TEXTO GRANDE MARQUEE ───────────────────────────────── */
.marquee-wrap {
  overflow: hidden;
  padding: 3rem 0;
  border-top: 1px solid rgba(255,255,255,.06);
  border-bottom: 1px solid rgba(255,255,255,.06);
  background: var(--gris-oscuro);
}
.marquee-pista {
  display: flex;
  gap: 2rem;
  width: max-content;
  animation: marquee 22s linear infinite;
}
.marquee-wrap:hover .marquee-pista { animation-play-state: paused; }
.marquee-item {
  font-family: var(--fuente-titulo);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  white-space: nowrap;
  color: rgba(255,255,255,.08);
  letter-spacing: .04em;
}
.marquee-item.acento { color: var(--acento); opacity: .3; }
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ── BLOG / ARTÍCULOS ───────────────────────────────────── */
.blog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}
.articulo-card {
  background: var(--gris-oscuro);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 4px;
  overflow: hidden;
  transition: transform var(--transicion), border-color var(--transicion);
}
.articulo-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212,168,67,.3);
}
.articulo-card__imagen {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  filter: brightness(.85);
  transition: filter var(--transicion);
}
.articulo-card:hover .articulo-card__imagen { filter: brightness(1); }
.articulo-card__cuerpo { padding: 1.5rem; }
.articulo-card__categoria {
  font-size: .7rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--acento);
  margin-bottom: .6rem;
}
.articulo-card__titulo {
  font-family: var(--fuente-titulo);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--blanco);
  margin-bottom: .8rem;
  transition: color var(--transicion);
}
.articulo-card:hover .articulo-card__titulo { color: var(--acento); }
.articulo-card__fecha {
  font-size: .78rem;
  color: var(--gris-suave);
}

/* ── CONTACTO ───────────────────────────────────────────── */
.contacto__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.contacto__info-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}
.contacto__icono {
  width: 44px; height: 44px;
  min-width: 44px;
  border-radius: 50%;
  background: var(--acento-lt);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.contacto__label {
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gris-suave);
  margin-bottom: .2rem;
}
.contacto__valor { font-size: .95rem; }

/* Formulario */
.form { display: flex; flex-direction: column; gap: 1.2rem; }
.form__fila { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form__grupo { display: flex; flex-direction: column; gap: .4rem; }
.form__label {
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--gris-suave);
}
.form__input,
.form__select,
.form__textarea {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 2px;
  padding: .85rem 1rem;
  color: var(--blanco);
  font-family: inherit;
  font-size: .95rem;
  transition: border-color var(--transicion);
  width: 100%;
}
.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--acento);
  background: rgba(212,168,67,.04);
}
.form__select option { background: var(--gris-oscuro); }
.form__textarea { resize: vertical; min-height: 140px; }
.form__btn {
  align-self: flex-start;
  padding: .95rem 2.5rem;
}
.form__mensaje {
  padding: 1rem;
  border-radius: 2px;
  font-size: .9rem;
  display: none;
}
.form__mensaje.exito {
  display: block;
  background: rgba(52,168,83,.15);
  border: 1px solid rgba(52,168,83,.3);
  color: #4caf50;
}
.form__mensaje.error {
  display: block;
  background: rgba(234,67,53,.12);
  border: 1px solid rgba(234,67,53,.3);
  color: #f44336;
}

/* ── FOOTER ─────────────────────────────────────────────── */
.footer {
  background: #050505;
  padding: 5rem 0 2rem;
  border-top: 1px solid rgba(255,255,255,.06);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,.06);
  margin-bottom: 2.5rem;
}
.footer__logo {
  font-family: var(--fuente-titulo);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: .8rem;
}
.footer__logo span { color: var(--acento); }
.footer__bajada {
  font-size: .88rem;
  color: rgba(255,255,255,.45);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  max-width: 260px;
}
.footer__redes { display: flex; gap: .75rem; flex-wrap: wrap; }
.footer__red {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.15);
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem;
  color: rgba(255,255,255,.5);
  transition: border-color var(--transicion), color var(--transicion), background var(--transicion);
}
.footer__red:hover {
  border-color: var(--acento);
  color: var(--acento);
  background: var(--acento-lt);
}
.footer__titulo-col {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--acento);
  margin-bottom: 1.2rem;
}
.footer__lista li { margin-bottom: .7rem; }
.footer__lista a {
  font-size: .88rem;
  color: rgba(255,255,255,.45);
  transition: color var(--transicion);
}
.footer__lista a:hover { color: var(--blanco); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer__copy {
  font-size: .78rem;
  color: rgba(255,255,255,.25);
}
.footer__legal { display: flex; gap: 1.5rem; }
.footer__legal a {
  font-size: .78rem;
  color: rgba(255,255,255,.25);
  transition: color var(--transicion);
}
.footer__legal a:hover { color: rgba(255,255,255,.6); }

/* ── ANIMACIONES DE ENTRADA (scroll) ────────────────────── */
.animar {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.animar.visible {
  opacity: 1;
  transform: translateY(0);
}
.animar-delay-1 { transition-delay: .1s; }
.animar-delay-2 { transition-delay: .2s; }
.animar-delay-3 { transition-delay: .3s; }
.animar-delay-4 { transition-delay: .4s; }

/* ── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .contacto__grid { grid-template-columns: 1fr; gap: 3rem; }
}
@media (max-width: 768px) {
  :root { --nav-h: 65px; }
  .nav__menu { display: none; }
  .nav__burger { display: flex; }

  .estadisticas { grid-template-columns: 1fr 1fr; }
  .estadistica { border-right: none; border-bottom: 1px solid rgba(255,255,255,.08); }
  .estadistica:last-child, .estadistica:nth-child(even) { border-bottom: none; }

  .form__fila { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer__bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .estadisticas { grid-template-columns: 1fr; }
  .estadistica { border-right: none; border-bottom: 1px solid rgba(255,255,255,.08); }
}