/* ══════════════════════════════════════════════════════════════
   LAYOUT — navegación, menú móvil, pie
   ══════════════════════════════════════════════════════════════ */

/* ─────────────────────────  NAVEGACIÓN  ───────────────────────
   §05 sets the horizontal logo minimum at 140 px wide, which is
   ~62 px tall in this lockup. The bar is sized around that rather
   than the logo being shrunk to fit the bar. */

/* Barra flotante sobre la fotografía de cabecera. Transparente con un
   degradado para legibilidad; al desplazar se vuelve Negro Obra sólido.
   Logotipo versión B (§05 · fondos oscuros). */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: var(--s4);
  padding-inline: var(--gutter);
  color: var(--blanco);
  background: transparent;
  border-bottom: 1px solid transparent;
  isolation: isolate;
  transition: height var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), backdrop-filter var(--dur) var(--ease);
}
.nav::before {
  content: '';
  position: absolute;
  inset: 0 0 -32px 0;
  z-index: -1;
  background: linear-gradient(to bottom, rgba(0,0,0,.7), rgba(0,0,0,0));
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}
.nav.is-stuck {
  height: var(--nav-h-sm);
  background: rgba(0,0,0,.88);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--neg-line);
}
.nav.is-stuck::before { opacity: 0; }

.nav__logo {
  display: flex;
  align-items: center;
  flex: none;
  margin-right: auto;
}
/* 140 px is the floor, never crossed — including once condensed. */
.nav__logo .brandmark {
  width: 160px;
  min-width: 140px;
  transition: width var(--dur) var(--ease);
}
.nav.is-stuck .nav__logo .brandmark { width: 140px; }

/* ── Enlaces ── */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--s1);
  list-style: none;
}
.nav__item { position: relative; }

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--s1) var(--s2);
  font-family: var(--mono);
  font-size: var(--t-mono);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.82);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}
.nav__link:hover { color: var(--neg-ink); }

/* Las barras (§08.03) as the active indicator — brand device, not a
   generic underline. */
.nav__link::after {
  content: '';
  position: absolute;
  left: var(--s2); right: var(--s2); bottom: 2px;
  height: var(--barra);
  background: var(--ambar);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after,
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link[aria-current="page"],
.nav__link.is-active { color: var(--neg-ink); }

.nav__caret { width: 10px; height: 10px; stroke-width: 2; transition: transform var(--dur) var(--ease); }
.nav__link[aria-expanded="true"] .nav__caret { transform: rotate(180deg); }

/* ── Desplegable de servicios — una ficha ── */
.nav__dropdown {
  position: absolute;
  top: calc(100% + var(--s1));
  left: 50%;
  min-width: 320px;
  padding: var(--s1);
  background: var(--neg-surface);
  border: 1px solid var(--neg-line);
  border-radius: var(--r-ficha);
  box-shadow: 0 16px 40px rgba(0,0,0,.55);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -6px);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility var(--dur);
}
.nav__dropdown.is-open { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

.nav__drop-link {
  display: flex;
  align-items: flex-start;
  gap: var(--s2);
  padding: var(--s2);
  border-radius: var(--r-sm);
  transition: background var(--dur) var(--ease);
}
.nav__drop-link:hover { background: rgba(255,255,255,.06); }
.nav__drop-link .icon { color: var(--ambar); margin-top: 2px; }
.nav__drop-title { display: block; font-size: var(--t-menor); font-weight: 600; color: var(--neg-ink); }
.nav__drop-desc  { display: block; font-size: var(--t-menor); color: var(--neg-ink-2); line-height: 1.4; }

/* ── Idioma ── */
.lang { display: flex; align-items: center; gap: 2px; flex: none; padding: 3px; border: 1px solid rgba(255,255,255,.18); border-radius: 999px; }
.lang__btn {
  border-radius: 999px !important;
  padding: 5px 10px;
  font-family: var(--mono);
  font-size: var(--t-mono-sm);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--neg-ink-2);
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.lang__btn:hover { color: var(--neg-ink); }
/* §06: negro sobre ámbar — óptimo */
.lang__btn.is-active { background: var(--ambar); color: var(--negro); }

/* ── Hamburguesa ── */
.nav__burger {
  position: relative;
  display: none;
  width: 44px; height: 44px;
  flex: none;
  border: 1px solid var(--neg-line);
  border-radius: var(--r-sm);
}
.nav__burger span {
  position: absolute;
  left: 12px;
  width: 20px; height: 2px;
  background: var(--neg-ink);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav__burger span:nth-child(1) { top: 15px; }
.nav__burger span:nth-child(2) { top: 21px; }
.nav__burger span:nth-child(3) { top: 27px; }
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ─────────────────────────  MENÚ MÓVIL  ───────────────────────
   Negro Obra panel — version B territory, so the logo flips. */
.menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  display: flex;
  flex-direction: column;
  padding: var(--s7) var(--gutter) var(--s6);
  background: var(--neg-ground);
  color: var(--neg-ink);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur);
}
.menu.is-open { opacity: 1; visibility: visible; }

.menu__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--s6); }
.menu__head .brandmark { width: 148px; }
.menu__close { width: 44px; height: 44px; border: 1px solid var(--neg-line); border-radius: var(--r-sm); color: var(--neg-ink); display: grid; place-items: center; }

.menu__list { list-style: none; }
.menu__item {
  border-bottom: 1px solid var(--neg-line);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 360ms var(--ease), transform 360ms var(--ease);
}
.menu.is-open .menu__item { opacity: 1; transform: none; }
.menu.is-open .menu__item:nth-child(1) { transition-delay:  40ms; }
.menu.is-open .menu__item:nth-child(2) { transition-delay:  80ms; }
.menu.is-open .menu__item:nth-child(3) { transition-delay: 120ms; }
.menu.is-open .menu__item:nth-child(4) { transition-delay: 160ms; }
.menu.is-open .menu__item:nth-child(5) { transition-delay: 200ms; }
.menu.is-open .menu__item:nth-child(6) { transition-delay: 240ms; }
.menu.is-open .menu__item:nth-child(7) { transition-delay: 280ms; }
.menu.is-open .menu__item:nth-child(8) { transition-delay: 320ms; }

.menu__link {
  display: flex;
  align-items: baseline;
  gap: var(--s2);
  padding: var(--s3) 0;
  font-family: var(--display);
  font-size: clamp(1.5rem, 7vw, 2.25rem);
  text-transform: uppercase;
  line-height: var(--lh-display);
  color: var(--neg-ink);
}
.menu__link--sub {
  font-family: var(--texto);
  font-size: 1rem;
  font-weight: 500;
  text-transform: none;
  padding: var(--s2) 0 var(--s2) var(--s4);
  color: var(--neg-ink-2);
}
.menu__foot { margin-top: auto; padding-top: var(--s6); display: grid; gap: var(--s3); justify-items: start; }

body.is-locked { overflow: hidden; }

/* ────────────────────────────  PIE  ───────────────────────────
   Negro Obra — the closing 30 % block. */
.footer {
  background: var(--neg-ground);
  color: var(--neg-ink);
  padding-top: var(--s8);
}
.footer .cota__rule { background: var(--neg-line); }
.footer .cota__r { color: var(--neg-ink-2); }

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--s6) var(--s4);
  padding-bottom: var(--s8);
}
.footer__brand .brandmark { width: 200px; margin-bottom: var(--s3); }
.footer__brand p { font-size: var(--t-menor); color: var(--neg-ink-2); max-width: 34ch; }

.footer__col h3 {
  font-family: var(--mono);
  font-size: var(--t-mono-sm);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--neg-ink-2);
  margin-bottom: var(--s3);
}
.footer__col ul { list-style: none; display: grid; gap: var(--s2); }
.footer__col a, .footer__col li { font-size: var(--t-menor); color: var(--neg-ink); }
.footer__col a { transition: color var(--dur) var(--ease); }
.footer__col a:hover { color: var(--ambar); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s2) var(--s4);
  padding-block: var(--s3);
  border-top: 1px solid var(--neg-line);
  font-family: var(--mono);
  font-size: var(--t-mono-sm);
  letter-spacing: 0.08em;
  color: var(--neg-ink-2);
}
.footer__legal { display: flex; gap: var(--s3); flex-wrap: wrap; }
.footer__legal a:hover { color: var(--neg-ink); }

/* ──────────────────────────  RESPONSIVE  ─────────────────────── */

@media (max-width: 1080px) {
  .footer__top { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav__links, .nav > .lang { display: none; }
  .nav__burger { display: block; }
  .nav { gap: var(--s2); }
}

@media (max-width: 560px) {
  .footer__top { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  /* Never below the §05 floor: at this width the wordmark gives way to
     the ficha alone rather than being scaled under 140 px. */
  .nav__logo .brandmark--symbol { width: auto; min-width: 0; height: 48px; }
}