/* =====================================================================
   Navbar
   ===================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-sticky);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header[data-state="scrolled"] {
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

/* Marca */
.brand { display: inline-flex; align-items: center; gap: var(--space-2); }
.brand__mark { width: 38px; height: auto; }
.brand__wordmark { height: 22px; width: auto; display: block; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--ink);
}

/* Navegación desktop */
.nav__list { display: flex; gap: var(--space-5); list-style: none; }
.nav__link {
  position: relative;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--ink);
  padding-block: var(--space-2);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background-image: var(--brand-gradient);
  transition: transform 0.25s ease;
}
.nav__link:hover::after,
.nav__link[aria-current="true"]::after { transform: scaleX(1); }

/* Botón hamburguesa */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 0;
  cursor: pointer;
}
.nav__toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Menú móvil */
.mobile-menu {
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: var(--space-5) var(--container-pad) var(--space-8);
}
.mobile-menu[hidden] { display: none; }
.mobile-menu__list { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.mobile-menu__link {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--ink);
  padding-block: var(--space-3);
}
.mobile-menu__cta { width: 100%; margin-top: var(--space-4); }

/* Responsive */
@media (max-width: 900px) {
  .nav,
  .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; }
}