/**
 * header.css — Nav fija + menú móvil
 */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 500;
  padding-block: 1.4rem;
  transition: padding var(--dur-fast) var(--ease-out), background var(--dur-fast), border-color var(--dur-fast);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  padding-block: 0.9rem;
  background: #2B2118d9;
  backdrop-filter: blur(14px);
  border-color: var(--border-hairline);
}

/* backdrop-filter sobre un header fixed recalcula el blur en cada frame de
   scroll — carísimo en GPUs móviles de gama media/baja. Se cambia por un
   fondo más opaco (sin blur) donde más se nota el costo. */
@media (max-width: 860px) {
  .site-header.is-scrolled {
    background: #2B2118f2;
    backdrop-filter: none;
  }
}
.site-header__inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.site-header__brand { display: flex; align-items: center; gap: 0.65rem; }
.site-header__mark { display: block; }
.site-header__wordmark { font-family: var(--font-display); font-size: 1.15rem; letter-spacing: 0.01em; }
.site-header__wordmark em { font-style: italic; color: var(--c-terracota); }

.site-header__nav { display: flex; gap: 2.1rem; }
.site-header__nav a {
  position: relative;
  font-size: 0.9rem;
  color: var(--text-muted-solid);
  transition: color var(--dur-fast);
}
.site-header__nav a::after {
  content: ''; position: absolute; left: 0; bottom: -4px;
  width: 0; height: 1px; background: var(--c-terracota);
  transition: width var(--dur-fast) var(--ease-out);
}
.site-header__nav a:hover { color: var(--c-marfil); }
.site-header__nav a:hover::after { width: 100%; }

.site-header__cta { font-size: 0.85rem; padding: 0.75rem 1.4rem; }

.site-header__toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  background: none; border: none; padding: 0;
}
.site-header__toggle span { width: 22px; height: 1px; background: var(--c-marfil); transition: transform var(--dur-fast), opacity var(--dur-fast); }

.mobile-nav {
  position: fixed; inset: 0;
  background: var(--c-cafe-black);
  z-index: 490;
  display: flex; align-items: center; justify-content: center;
  transform: translateY(-100%);
  transition: transform 0.6s var(--ease-soft);
}
.mobile-nav.is-open { transform: translateY(0); }
.mobile-nav nav { display: flex; flex-direction: column; align-items: center; gap: 1.8rem; }
.mobile-nav a { font-family: var(--font-display); font-size: 1.9rem; }
.mobile-nav__cta { color: var(--c-terracota); }

@media (max-width: 900px) {
  .site-header__nav, .site-header__cta { display: none; }
  .site-header__toggle { display: flex; }
}