/* ==========================================================
   Header y navegación
   ========================================================== */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  height: var(--header-h);
  background: rgba(251, 251, 249, 0);
  border-bottom: 1px solid transparent;
  transition: background-color .3s var(--ease), border-color .3s var(--ease), height .3s var(--ease);
}
/* El desenfoque va en un pseudo-elemento: backdrop-filter en el header
   convertiría al header en el contenedor del menú móvil (position: fixed). */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0;
  background: rgba(251, 251, 249, .9);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  transition: opacity .3s var(--ease);
}
.site-header.is-scrolled { --header-h: 64px; border-bottom-color: var(--line); }
.site-header.is-scrolled::before,
.site-header.menu-is-open::before { opacity: 1; }

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.brand { display: block; flex-shrink: 0; }
.brand img { height: 40px; width: auto; transition: height .3s var(--ease); }
.is-scrolled .brand img { height: 36px; }

.nav { margin-left: auto; }
.nav__list { display: flex; gap: var(--space-1); }
.nav__link {
  position: relative;
  display: block;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: 2px;
  height: 1.5px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease);
}
.nav__link:hover, .nav__link.is-active { color: var(--navy); }
.nav__link:hover::after, .nav__link.is-active::after { transform: scaleX(1); }

.nav__mobile-foot { display: none; }
.header-cta { min-height: 42px; }

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
}
.menu-toggle__bars,
.menu-toggle__bars::before,
.menu-toggle__bars::after {
  display: block;
  width: 18px;
  height: 1.5px;
  margin-inline: auto;
  background: var(--navy);
  transition: transform .3s var(--ease), opacity .2s;
}
.menu-toggle__bars { position: relative; }
.menu-toggle__bars::before, .menu-toggle__bars::after { content: ""; position: absolute; left: 0; }
.menu-toggle__bars::before { top: -6px; }
.menu-toggle__bars::after { top: 6px; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars { background: transparent; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Móvil y tablet: menú de pantalla completa ---------- */
@media (max-width: 1023px) {
  .header-cta { display: none; }
  .menu-toggle { display: grid; place-items: center; }
  .brand img { height: 34px; }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: var(--space-6) var(--gutter) calc(var(--space-6) + env(safe-area-inset-bottom));
    background: var(--ivory);
    border-top: 1px solid var(--line);
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity .3s var(--ease), transform .3s var(--ease), visibility 0s .3s;
  }
  .nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity .3s var(--ease), transform .3s var(--ease);
  }
  .nav__list { flex-direction: column; gap: 0; }
  .nav__list li { border-bottom: 1px solid var(--line); }
  .nav__link {
    padding: var(--space-4) 0;
    font-size: clamp(1.5rem, 1rem + 3vw, 2rem);
    color: var(--navy);
  }
  .nav__link::after { display: none; }
  .nav__link.is-active { color: var(--green); }

  .nav__mobile-foot { display: grid; gap: var(--space-5); margin-top: var(--space-7); }
  .nav__tagline { color: var(--text-muted); }
  .nav__tagline strong { color: var(--navy); font-weight: 600; }

  body.menu-open { overflow: hidden; }
}