/* ==========================================================================
   header.css — Cabecera / navegación (mobile-first, tema oscuro)
   Marca a la izquierda · nav tipo "píldora" al centro · DOWNLOAD a la derecha.
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(6, 3, 9, 0.6);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-sm);
  height: var(--header-h);
}

/* ---- Marca ---- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--color-text);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: var(--color-cream);
  font-weight: 700;
  box-shadow: 0 0 0 1px rgba(255, 252, 239, 0.15), 0 4px 14px rgba(82, 51, 254, 0.45);
}

/* ---- Navegación (móvil: panel desplegable) ---- */
.nav {
  position: fixed;
  inset: var(--header-h) 0 auto 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem var(--container-pad) 2rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  transform: translateY(-120%);
  transition: transform var(--transition);
}

.nav--open {
  transform: translateY(0);
}

.nav__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav__link {
  display: block;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-pill);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition), background-color var(--transition);
}

.nav__link:hover {
  color: var(--color-cream);
}

/* Página actual: píldora resaltada (como "home" en la referencia) */
.nav__link.is-active {
  color: var(--color-cream);
  background-color: rgba(255, 252, 239, 0.1);
}

/* ---- Botón hamburguesa ---- */
.nav-toggle {
  justify-self: end;
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-cream);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* DOWNLOAD: oculto en móvil (acción disponible al abrir el menú o en el hero) */
.header__cta {
  display: none;
}

/* ---- Tablet / escritorio: nav horizontal tipo "píldora" ---- */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav {
    position: static;
    inset: auto;
    justify-self: center;
    flex-direction: row;
    align-items: center;
    gap: 0;
    padding: 0.35rem;
    background-color: rgba(255, 252, 239, 0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    box-shadow: none;
    transform: none;
  }

  .nav__list {
    flex-direction: row;
    gap: 0.25rem;
  }

  .header__cta {
    display: inline-flex;
    justify-self: end;
  }
}