/* ==========================================================================
   KOA — NAVBAR
   Transparente sobre el Hero, sólida al hacer scroll (clase .navbar--scrolled
   añadida por js/main.js). El logo oscuro (koa-logo.png) se usa en toda la
   navbar porque su propio fondo gris oscuro se integra con el tema oscuro
   del sitio y sus tonos dorado/rojo mantienen alto contraste en ambos
   estados. La variante clara (koa-logo-inverted.png) queda reservada para
   futuras secciones o páginas con fondo claro.
   ========================================================================== */

.navbar {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  background: linear-gradient(to bottom, rgba(10, 10, 13, 0.75), rgba(10, 10, 13, 0));
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.navbar--scrolled {
  background: rgba(10, 10, 13, 0.92);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: var(--space-3);
}

.navbar__brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.navbar__logo {
  width: 52px;
  height: 52px;
}

/* ---- Navegación (desktop) ---- */

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-7);
  margin-inline-start: auto;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.navbar__link {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink);
  padding-block: var(--space-2);
  transition: color var(--dur) var(--ease);
}

.navbar__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--flame);
  transition: right var(--dur) var(--ease);
}

.navbar__link:hover,
.navbar__link.is-active {
  color: var(--ember);
}

.navbar__link:hover::after,
.navbar__link.is-active::after {
  right: 0;
}

/* ---- Botón hamburguesa (oculto en desktop) ---- */

.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  padding: 0;
  flex-shrink: 0;
}

.navbar__toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--ink);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(2) {
  opacity: 0;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   RESPONSIVE — TABLET Y MÓVIL
   Menú hamburguesa funcional: panel desplegable bajo la navbar.
   ========================================================================== */

@media (max-width: 960px) {
  .navbar__toggle {
    display: flex;
  }

  .navbar__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    background: rgba(10, 10, 13, 0.97);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease);
  }

  .navbar__nav.is-open {
    max-height: 480px;
  }

  .navbar__links {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-4) var(--container-pad) 0;
  }

  .navbar__links li {
    width: 100%;
  }

  .navbar__link {
    display: block;
    width: 100%;
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--line);
    font-size: var(--fs-lg);
  }

  .navbar__link::after {
    display: none;
  }

  .navbar__cta {
    margin: var(--space-5) var(--container-pad) var(--space-6);
  }
}