/* ============================================================
   Header + navegación + footer
   ============================================================ */

/* ---------- Header (se esconde al bajar, vuelve al subir) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(246, 248, 247, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--rule);
  transition: translate 0.4s var(--ease-quint), box-shadow var(--dur-1) var(--ease);
}
.site-header.is-hidden { translate: 0 -100%; }
.site-header.is-scrolled { box-shadow: 0 8px 28px -20px rgba(4, 48, 45, 0.35); }
@media (prefers-reduced-motion: reduce) {
  .site-header { transition: none; }
  .site-header.is-hidden { translate: none; }
}
.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  min-height: 68px;
}
.site-header__logo img { height: 38px; width: auto; }

.site-header__tagline {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 400;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
  line-height: 1;
  margin: 0;
  padding-left: 1.1rem;
  border-left: 1px solid var(--rule);
  white-space: nowrap;
}

/* ---------- Navegación principal ---------- */
.mainnav { display: flex; align-items: center; gap: 0.1rem; }
.mainnav a {
  position: relative;
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0;
  color: var(--ink-soft);
  padding: 0.55rem 0.7rem;
  border-radius: var(--r-sm);
  transition: color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.mainnav a::after {
  content: "";
  position: absolute;
  left: 0.7rem; right: 0.7rem; bottom: 0.15rem;
  height: 2px;
  background: var(--accent);
  scale: 0 1;
  transform-origin: left;
  transition: scale var(--dur-1) var(--ease);
}
.mainnav a:hover { color: var(--ink); background: rgba(11, 26, 24, 0.04); }
.mainnav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.mainnav a[aria-current="page"]::after { scale: 1 1; }

.site-header__cta { display: flex; align-items: center; gap: 0.75rem; }

/* Botón hamburguesa (móvil) */
.navtoggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: none;
  cursor: pointer; padding: 8px;
  /* El control principal en móvil: 44 px de lado, como pide WCAG 2.5.8 */
  min-width: 44px; min-height: 44px;
  align-items: center; justify-content: center;
}
.navtoggle span { width: 24px; height: 2px; background: var(--ink); transition: var(--dur-1) var(--ease); }

/* ============================================================
   Footer — superficie profunda con retícula, sin gradiente animado
   ============================================================ */
.site-footer {
  position: relative;
  isolation: isolate;
  margin-top: clamp(3rem, 8vw, 6rem);
  color: rgba(255, 255, 255, 0.62);
  background: var(--grad-deep);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(90deg, var(--grid-line-on-deep) 1px, transparent 1px),
    linear-gradient(var(--grid-line-on-deep) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(110% 100% at 15% 0%, #000 5%, transparent 70%);
  -webkit-mask-image: radial-gradient(110% 100% at 15% 0%, #000 5%, transparent 70%);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-block: clamp(2.75rem, 6vw, 4.5rem) 2.5rem;
}
.site-footer h2 {
  color: rgba(255, 255, 255, 0.74);   /* 4,5:1 sobre el fondo profundo */
  font-family: var(--font-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  font-size: var(--step--2);
  margin: 0 0 1.15rem;
}
.site-footer__logo img { height: 42px; width: auto; margin-bottom: 1.25rem; }
.site-footer p { color: rgba(255, 255, 255, 0.58); font-size: var(--step--1); max-width: 42ch; line-height: 1.6; }
.site-footer a { color: rgba(255, 255, 255, 0.8); font-size: var(--step--1); }
.site-footer a:hover { color: #fff; }

.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.2rem; }
/* Cada enlace del pie es un destino de navegación, no texto corrido:
   se le da alto propio para que se pueda pulsar con el dedo. */
.footer-links a { display: inline-flex; align-items: center; min-height: 32px; }
@media (pointer: coarse) {
  .footer-links { gap: 0.35rem; }
  .footer-links a { min-height: 40px; }
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: 1.35rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.7);    /* 4,5:1 sobre el fondo profundo */
}

/* ---------- Navegación móvil ---------- */
@media (max-width: 980px) {
  .site-header__tagline { display: none; }
  .navtoggle { display: flex; }
  .mainnav {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--white);
    border-bottom: 1px solid var(--rule);
    padding: 0.75rem var(--gutter) 1.25rem;
    translate: 0 -120%;
    transition: translate 0.35s var(--ease);
    box-shadow: var(--sh-3);
  }
  .mainnav.is-open { translate: 0 0; }
  .mainnav a {
    padding: 0.9rem 0;
    font-size: var(--step-0);
    border-radius: 0;
    border-bottom: 1px solid var(--rule-soft);
  }
  .mainnav a:hover { background: transparent; }
  .mainnav a::after { display: none; }
  .mainnav__cta { text-align: center; margin-top: 0.85rem; border-bottom: 0 !important; }
  .site-footer__grid { grid-template-columns: 1fr; gap: 2rem; }
}