/* ==========================================================================
   layout.css — Header, navegación, footer y rejillas estructurales
   Grup SUERC
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Header fijo
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgb(16 14 12 / 0.62), transparent);
  opacity: 1;
  transition: opacity var(--dur) var(--ease);
  pointer-events: none;
}

/* Estado desplazado, y estado por defecto en páginas sin hero oscuro */
.site-header.is-stuck,
.site-header--solid {
  background-color: rgb(253 251 248 / 0.86);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-s);
}

.site-header.is-stuck::before,
.site-header--solid::before { opacity: 0; }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
  width: 100%;
}

/* Logotipo -------------------------------------------------------------- */
.brand {
  display: inline-flex;
  align-items: center;
  color: var(--cream-50);
  text-decoration: none;
  transition: color var(--dur) var(--ease), opacity var(--dur-fast) var(--ease);
}

.brand:hover { opacity: 0.82; }

.brand__logo {
  width: auto;
  height: 2.6rem;
}

.is-stuck .brand,
.site-header--solid .brand { color: var(--ink-800); }

/* --------------------------------------------------------------------------
   2. Navegación principal
   -------------------------------------------------------------------------- */
.nav {
  display: flex;
  align-items: center;
  gap: clamp(0.35rem, 1.4vw, 1.35rem);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 1.2vw, 0.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__link {
  display: block;
  position: relative;
  padding: 0.5rem 0.7rem;
  color: var(--cream-100);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  border-radius: var(--radius-s);
  transition: color var(--dur-fast) var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.28rem;
  height: 1.5px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.nav__link:hover::after,
.nav__link:focus-visible::after { transform: scaleX(1); }

.nav__link[aria-current="page"] {
  color: var(--accent-300);
  font-weight: 600;
}

.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.is-stuck .nav__link,
.site-header--solid .nav__link { color: var(--ink-700); }

.is-stuck .nav__link[aria-current="page"],
.site-header--solid .nav__link[aria-current="page"] { color: var(--accent-600); }

/* Botón hamburguesa ----------------------------------------------------- */
.nav-toggle {
  display: none;
  position: relative;
  z-index: 120;
  width: 2.9rem;
  height: 2.9rem;
  padding: 0;
  border-radius: var(--radius-s);
  cursor: pointer;
  color: var(--cream-50);
}
.nav-open .nav-toggle{
color:#000000;
}

.is-stuck .nav-toggle,
.site-header--solid .nav-toggle { color: var(--ink-800); }

.nav-toggle__box {
  display: block;
  position: relative;
  width: 1.4rem;
  height: 0.85rem;
  margin-inline: auto;
}

.nav-toggle__bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur-fast) var(--ease);
}

.nav-toggle__bar:nth-child(1) { top: 0; }
.nav-toggle__bar:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-toggle__bar:nth-child(3) { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(0.42rem) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-0.42rem) rotate(-45deg);
}

/* Overlay del menú móvil ------------------------------------------------ */
.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 90;
  background-color: rgb(16 14 12 / 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility 0s linear var(--dur);
}

.nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur) var(--ease), visibility 0s linear 0s;
}

body.nav-open { overflow: hidden; }

/* --------------------------------------------------------------------------
   3. Navegación responsive
   -------------------------------------------------------------------------- */
@media (max-width: 68rem) {
  .nav-toggle { display: block; }

  .nav {
    position: fixed;
    inset: 0 0 0 auto;
    z-index: 110;
    width: min(23rem, 86vw);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-m);
    padding: calc(var(--header-h) + var(--space-l)) var(--space-l) var(--space-l);
    background-color: var(--cream-50);
    box-shadow: var(--shadow-l);
    transform: translateX(100%);
    visibility: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    /* `visibility` cambia de golpe, no de forma gradual: al abrir debe ser
       inmediata (si no, focus() no puede entrar en el panel) y al cerrar se
       retrasa hasta que termina el desplazamiento. */
    transition:
      transform var(--dur) var(--ease),
      visibility 0s linear var(--dur);
  }

  .nav.is-open {
    transform: translateX(0);
    visibility: visible;
    transition:
      transform var(--dur) var(--ease),
      visibility 0s linear 0s;
	height:100vh;

  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__item + .nav__item { border-top: 1px solid var(--border); }

  .nav__link,
  .is-stuck .nav__link,
  .site-header--solid .nav__link {
    padding: 0.95rem 0.25rem;
    color: var(--ink-800);
    font-size: var(--step-0);
  }

  .nav__link::after { display: none; }

  .nav__link[aria-current="page"],
  .is-stuck .nav__link[aria-current="page"],
  .site-header--solid .nav__link[aria-current="page"] { color: var(--accent-600); }

  .nav .btn { width: 100%; justify-content: center; }
}

/* --------------------------------------------------------------------------
   4. Cuerpo de página
   -------------------------------------------------------------------------- */
.page-main { min-height: 55svh; }

/* Empuja el contenido bajo el header fijo en páginas sin hero a sangre */
.page-main--offset { padding-top: var(--header-h); }

/* --------------------------------------------------------------------------
   5. Rejillas
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-m);
}

.grid--projects {
  grid-template-columns: repeat(auto-fit, minmax(min(19rem, 100%), 1fr));
  gap: clamp(1.25rem, 2.6vw, 2.25rem);
}

.grid--features {
  grid-template-columns: repeat(auto-fit, minmax(min(15rem, 100%), 1fr));
  gap: clamp(1.5rem, 3vw, 3rem);
}

.grid--split {
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

@media (min-width: 56rem) {
  .grid--split { grid-template-columns: 1.05fr 0.95fr; }
  .grid--split--reverse > :first-child { order: 2; }
}

/* --------------------------------------------------------------------------
   6. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--ink-900);
  color: var(--cream-200);
  padding-block: var(--space-2xl) var(--space-m);
  font-size: var(--step--1);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(14rem, 100%), 1fr));
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: var(--space-xl);
}

.site-footer__brand { grid-column: 1 / -1; }

@media (min-width: 56rem) {
  .site-footer__brand {
    grid-column: auto;
    max-width: 22rem;
  }
}

.site-footer__logo {
  height: 3rem;
  width: auto;
  color: var(--cream-100);
  margin-bottom: var(--space-s);
}

.site-footer__tagline {
  color: var(--ink-300);
  line-height: 1.7;
}

.site-footer__title {
  margin-bottom: var(--space-s);
  color: var(--cream-50);
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer a {
  color: var(--cream-200);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

.site-footer a:hover,
.site-footer a:focus-visible { color: var(--accent-300); }

.site-footer address {
  font-style: normal;
  color: var(--ink-300);
  line-height: 1.8;
}

/* Redes sociales -------------------------------------------------------- */
.social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: var(--space-m);
  padding: 0;
  list-style: none;
}

.social__link {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid rgb(248 243 236 / 0.18);
  border-radius: var(--radius-pill);
  color: var(--cream-200);
  transition:
    background-color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease-out-back);
}

.social__link:hover,
.social__link:focus-visible {
  background-color: var(--accent-500);
  border-color: var(--accent-500);
  color: #fff;
  transform: translateY(-2px);
}

.social__link svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: currentColor;
}

/* Barra inferior -------------------------------------------------------- */
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-s) var(--space-m);
  padding-top: var(--space-m);
  border-top: 1px solid rgb(248 243 236 / 0.12);
  color: var(--ink-300);
}

.legal-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.legal-nav li { position: relative; }

.legal-nav li + li::before {
  content: "";
  position: absolute;
  left: -0.6rem;
  top: 50%;
  width: 1px;
  height: 0.85em;
  transform: translateY(-50%);
  background-color: rgb(248 243 236 / 0.22);
}