/* ==========================================================================
   SILVERA CONSTRUCCIONES — Hoja de estilos
   Paleta basada en el logo: acero #6f706e + latón #a48b5b
   Mobile-first: los estilos base son para celular y se amplían con @media
   ========================================================================== */

/* ---------- Variables de diseño (colores, tipografías, medidas) ---------- */
:root {
  --c-carbon: #26272a;        /* fondo oscuro principal */
  --c-carbon-2: #1d1e21;      /* fondo oscuro más profundo */
  --c-steel: #6f706e;         /* gris acero (marca) */
  --c-brass: #a48b5b;         /* dorado latón (marca) */
  --c-brass-light: #c4ad7d;   /* latón claro para hovers */
  --c-paper: #f4f3f0;         /* fondo claro cálido */
  --c-white: #ffffff;
  --c-text: #33342f;          /* texto sobre fondo claro */
  --c-text-soft: #5c5d59;     /* texto secundario */

  --font-display: "Barlow Condensed", sans-serif;
  --font-body: "Barlow", sans-serif;

  --header-h: 100px;
  --radius: 6px;
  --shadow: 0 10px 30px rgba(29, 30, 33, 0.12);
  --transition: 0.25s ease;
}

/* ---------- Reset básico ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--c-text);
  background: var(--c-paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

/* Contenedor central */
.container {
  width: min(1140px, 100% - 2.5rem);
  margin-inline: auto;
}

/* ---------- Utilidades de sección ---------- */
.section { padding: 4.5rem 0; }

.section--alt { background: var(--c-white); }

.section--dark {
  background: var(--c-carbon);
  color: var(--c-paper);
}

/* Etiqueta pequeña sobre los títulos, con la línea de latón (firma visual) */
.section__eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-brass);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.section__eyebrow::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--c-brass);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 4.5vw, 2.75rem);
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
}

.section__head { margin-bottom: 2.5rem; }

/* ---------- Botones ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.85rem 1.9rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--c-brass);
  color: var(--c-carbon-2);
}
.btn--primary:hover { background: var(--c-brass-light); }

.btn--ghost {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--c-white);
}
.btn--ghost:hover { border-color: var(--c-brass); color: var(--c-brass-light); }

/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  background: rgba(29, 30, 33, 0.92);
  backdrop-filter: blur(8px);
  z-index: 100;
  border-bottom: 1px solid rgba(164, 139, 91, 0.25);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo { height: 90px; width: auto; }

/* Botón hamburguesa (mobile) */
.header__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}
.header__toggle span {
  width: 26px;
  height: 2px;
  background: var(--c-paper);
  transition: transform var(--transition), opacity var(--transition);
}
/* Animación a "X" cuando el menú está abierto */
.header__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header__toggle.is-open span:nth-child(2) { opacity: 0; }
.header__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Menú desplegable en mobile */
.nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--c-carbon-2);
  transform: translateY(-120%);
  /* visibility oculta el menú por completo cuando está cerrado,
     evitando que asome por encima del header */
  visibility: hidden;
  transition: transform 0.3s ease, visibility 0.3s;
  border-bottom: 1px solid rgba(164, 139, 91, 0.25);
}
.nav.is-open { transform: translateY(0); visibility: visible; }

.nav__list {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem 1.5rem;
  gap: 0.25rem;
}

.nav__link {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-paper);
  padding: 0.6rem 0.25rem;
  transition: color var(--transition);
}
.nav__link:hover { color: var(--c-brass-light); }

.nav__link--cta { color: var(--c-brass); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: url("../img/hero.jpg") center / cover no-repeat;
  color: var(--c-white);
  padding-bottom: 80px;
}

/*Oculto logo en mobile*/
@media (max-width: 768px) {
  .nologo {
    display: none;
  }
}

/* Capa oscura sobre la foto para que el texto sea legible */
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(29, 30, 33, 0.82) 0%, rgba(29, 30, 33, 0.55) 55%, rgba(29, 30, 33, 0.8) 100%);
}

.hero__content {
  position: relative;
  padding-top: var(--header-h);
  max-width: 780px;
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  font-size: 0.9rem;
  color: var(--c-brass-light);
  margin-bottom: 1rem;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  line-height: 1.05;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: rgba(244, 243, 240, 0.9);
  max-width: 560px;
  margin-bottom: 2rem;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ==========================================================================
   QUIÉNES SOMOS
   ========================================================================== */
.about__grid { display: grid; gap: 2.5rem; }

/* Marco desplazado de latón sobre la foto (detalle de marca) */
.about__media { position: relative; }
.about__media::after {
  content: "";
  position: absolute;
  inset: 1rem -1rem -1rem 1rem;
  border: 2px solid var(--c-brass);
  border-radius: var(--radius);
  z-index: -1;
}
.about__media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about__text p { margin-bottom: 1rem; color: var(--c-text-soft); }

.about__claims { margin-top: 1.5rem; display: grid; gap: 0.65rem; }
.about__claims li {
  padding-left: 1.6rem;
  position: relative;
  font-weight: 500;
}
.about__claims li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 14px;
  height: 2px;
  background: var(--c-brass);
}

/* ---------- Historia expandible ---------- */
.about__lead { font-size: 1.1rem; color: var(--c-text); }

/* Truco: grid con filas 0fr → 1fr permite animar la altura
   sin conocer el alto real del contenido (max-height no lo logra bien) */
.about__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.5s ease;
}
.about__more-inner { overflow: hidden; }

.about__more.is-open { grid-template-rows: 1fr; }

/* Frase de cierre con la firma visual de la marca */
.about__closing {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-brass);
}

/* Botón secundario acorde a la paleta */
.btn--more {
  background: none;
  border-color: var(--c-brass);
  color: var(--c-brass);
  margin-top: 0.5rem;
}
.btn--more:hover { background: var(--c-brass); color: var(--c-white); }

/* ==========================================================================
   SERVICIOS (cards) — 1 col mobile / 2 tablet / 3 desktop
   ========================================================================== */
.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.card {
  background: var(--c-paper);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border-top: 3px solid transparent;
  transition: transform var(--transition), border-color var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  border-top-color: var(--c-brass);
}

.card__media { aspect-ratio: 16 / 10; overflow: hidden; }
.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.card:hover .card__media img { transform: scale(1.05); }

.card__body { padding: 1.5rem 1.5rem 1.75rem; }

.card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 24px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.9rem;
  color: #a48b5b;
}

.card__list { display: grid; gap: 0.4rem; color: var(--c-text-soft); }
.card__list li {
  padding-left: 1.3rem;
  position: relative;
}
.card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 10px;
  height: 2px;
  background: var(--c-brass);
}

/* ==========================================================================
   PROYECTOS
   ========================================================================== */
.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

/* Card de proyecto: reutiliza .card, con extras */
.project-card { cursor: pointer; text-align: left; border: none; font: inherit; padding: 0; width: 100%; }
.project-card .card__desc { color: var(--c-text-soft); margin-top: 0.4rem; }
.project-card .card__more {
  display: inline-block;
  margin-top: 0.9rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.9rem;
  color: var(--c-brass);
}

/* ==========================================================================
   CONTACTO
   ========================================================================== */
.contact__grid { display: grid; gap: 3rem; }

.contact .section__eyebrow { color: var(--c-brass-light); }
.contact__lead { color: rgba(244, 243, 240, 0.85); margin-bottom: 2rem; }

.contact__data { display: grid; gap: 1.25rem; }
.contact__data li { display: grid; gap: 0.15rem; }
.contact__label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-brass);
}
.contact__data a {
  font-size: 1.1rem;
  transition: color var(--transition);
}
.contact__data a:hover { color: var(--c-brass-light); }

/* ---------- Formulario ---------- */
.form { display: grid; gap: 1.1rem; }

.form__group { display: grid; gap: 0.35rem; }

.form label {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: rgba(244, 243, 240, 0.85);
}

.form input,
.form textarea {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-paper);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(244, 243, 240, 0.25);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  transition: border-color var(--transition);
}
.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--c-brass);
}

/* Campo con error de validación */
.form input.is-invalid,
.form textarea.is-invalid { border-color: #d9705c; }

.form__error {
  font-size: 0.85rem;
  color: #e8a396;
  min-height: 1em;
}

/* Honeypot: se oculta visualmente, no con display:none
   (algunos bots detectan display:none) */
.form__hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form__submit { justify-self: start; }
.form__submit:disabled { opacity: 0.6; cursor: wait; }

.form__status { min-height: 1.4em; font-weight: 500; }
.form__status.is-success { color: #a9d9a0; }
.form__status.is-error { color: #e8a396; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background: var(--c-carbon-2);
  color: rgba(244, 243, 240, 0.75);
  padding: 3rem 0 2rem;
}

.footer__inner {
  display: grid;
  gap: 1.25rem;
  justify-items: center;
  text-align: center;
}

.footer__logo { height: 90px; width: auto; }

.footer__data { display: grid; gap: 0.25rem; }
.footer__data a:hover { color: var(--c-brass-light); }

.footer__social { display: flex; gap: 1.25rem; }
.footer__social a { color: var(--c-brass); }

.footer__copy { font-size: 0.9rem; }

/* ==========================================================================
   BOTÓN FLOTANTE DE WHATSAPP
   ========================================================================== */
.whatsapp-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #25d366;
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  animation: fab-pulse 2.4s infinite;
  transition: transform var(--transition);
}
.whatsapp-fab:hover { transform: scale(1.08); animation: none; }

/* Pulso sutil */
@keyframes fab-pulse {
  0%   { box-shadow: 0 6px 20px rgba(0,0,0,0.3), 0 0 0 0 rgba(37, 211, 102, 0.45); }
  70%  { box-shadow: 0 6px 20px rgba(0,0,0,0.3), 0 0 0 16px rgba(37, 211, 102, 0); }
  100% { box-shadow: 0 6px 20px rgba(0,0,0,0.3), 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* ==========================================================================
   MODAL DE PROYECTO
   ========================================================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.modal[hidden] { display: none; }

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(29, 30, 33, 0.75);
}

.modal__panel {
  position: relative;
  background: var(--c-white);
  border-radius: var(--radius);
  max-width: 860px;
  width: 100%;
  max-height: 88svh;
  overflow-y: auto;
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
}

.modal__close {
  position: absolute;
  top: 0.6rem;
  right: 0.8rem;
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--c-steel);
  cursor: pointer;
}
.modal__close:hover { color: var(--c-carbon); }

.modal__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 24px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  padding-right: 2rem;
}

.modal__desc { color: var(--c-text-soft); margin-bottom: 1.5rem; }

.modal__gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}
.modal__gallery img { border-radius: var(--radius); width: 100%; }

/* ==========================================================================
   ANIMACIÓN DE APARICIÓN AL SCROLL (.reveal + IntersectionObserver en JS)
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Respetar la preferencia del usuario de reducir animaciones */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .whatsapp-fab { animation: none; }
}

/* ==========================================================================
   MEDIA QUERIES — tablet y desktop
   ========================================================================== */

/* Tablet */
@media (min-width: 640px) {
  .services__grid,
  .projects__grid { grid-template-columns: repeat(2, 1fr); }

  .modal__gallery { grid-template-columns: repeat(2, 1fr); }
}

/* Desktop */
@media (min-width: 960px) {
  /* El menú pasa a estar siempre visible en línea */
  .header__toggle { display: none; }

  .nav {
    position: static;
    transform: none;
    visibility: visible; /* en desktop el menú está siempre visible */
    background: none;
    border: none;
  }
  .nav__list {
    flex-direction: row;
    gap: 1.75rem;
    padding: 0;
  }
  .nav__link { font-size: 1rem; padding: 0.25rem 0; }

  .services__grid { grid-template-columns: repeat(3, 1fr); }
  .projects__grid { grid-template-columns: repeat(3, 1fr); }

.about__grid {
  grid-template-columns: 5fr 6fr;
  align-items: start;   /* antes era center */
  gap: 4rem;
}

.about__media {
  position: sticky;
  top: calc(var(--header-h) + 2rem); /* queda pegada debajo del header fijo */
}

  .contact__grid {
    grid-template-columns: 5fr 6fr;
    gap: 4rem;
  }

  .section { padding: 6rem 0; }
}