/* ============================================================
 * farpa DS · component · nav · v1.0.0
 * ------------------------------------------------------------
 * Header de navegação. Logo à esquerda · ações à direita.
 * Inclui slot para lang-switcher e hc-toggle.
 * Acessível: <nav aria-label="primary"> · skip-link no host.
 * ============================================================ */

.farpa-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-5);
  height: var(--nav-height);
  background: var(--nav-bg);
  color: var(--nav-fg);
  border-bottom: 1px solid var(--nav-border);
  z-index: var(--z-nav);
  position: sticky;
  top: 0;
}

.farpa-nav__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  color: var(--fg);
}
.farpa-nav__brand img,
.farpa-nav__brand svg {
  height: 1.75rem;
  width: auto;
}

/* Monograma SVG inline · usa currentColor · herda do .farpa-nav__brand
 * --mark-fill-tint controla o preenchimento da figura interna (definido por tema). */
.farpa-mark {
  flex-shrink: 0;
  color: var(--fg);
}

/* Wordmark "farpa.ai" · Decisão Founder ratificada 2026-05-10 (gate S→B item 1).
 * Família = Space Grotesk Variable (NÃO Fraunces · não display · grotesk geométrica).
 * "farpa" weight 900 · ".ai" weight 300 · cor blood-700 light · blood-200 dark · currentColor HC.
 * letter-spacing -0.04em · alinha verticalmente com o monograma. */
.farpa-nav__brand-text {
  font-family: var(--font-grotesk);
  font-size: var(--fs-lg);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  display: inline-flex;
  align-items: baseline;
}
.farpa-nav__brand-tld {
  font-family: var(--font-grotesk);
  font-weight: 300;
  letter-spacing: -0.04em;
  color: var(--accent);
  /* Tema-default: light → blood-700 via --accent · dark/HC sobrescritos abaixo. */
}

/* TLD ".ai" · cor por tema · semantic-aware. */
[data-theme="dark"] .farpa-nav__brand-tld {
  color: var(--c-blood-200);
}
[data-theme="hc"] .farpa-nav__brand-tld {
  color: currentColor;
}

.farpa-nav__menu {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  list-style: none;
  margin: 0;
  padding: 0;
}
.farpa-nav__menu a {
  font-size: var(--fs-sm);
  color: var(--nav-fg);
  text-decoration: none;
  padding: var(--sp-2) var(--sp-1);
  border-bottom: 2px solid transparent;
  transition: color var(--motion-fast) var(--ease-standard),
              border-color var(--motion-fast) var(--ease-standard);
}
.farpa-nav__menu a:hover,
.farpa-nav__menu a[aria-current="page"] {
  color: var(--nav-link-hover);
  border-bottom-color: var(--nav-link-hover);
}

.farpa-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Hamburger toggle · só visível em mobile (≤720px)
 * Tap target 44×44px (iOS HIG · WCAG 2.5.5).
 * Animação opcional barras → X via [aria-expanded="true"]. */
.farpa-nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: transparent;
  color: var(--nav-fg);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.farpa-nav__toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.farpa-nav__toggle-icon,
.farpa-nav__toggle-icon::before,
.farpa-nav__toggle-icon::after {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--motion-fast) var(--ease-standard),
              opacity var(--motion-fast) var(--ease-standard),
              top var(--motion-fast) var(--ease-standard);
}
.farpa-nav__toggle-icon {
  position: relative;
}
.farpa-nav__toggle-icon::before,
.farpa-nav__toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}
.farpa-nav__toggle-icon::before { top: -6px; }
.farpa-nav__toggle-icon::after  { top:  6px; }
.farpa-nav__toggle[aria-expanded="true"] .farpa-nav__toggle-icon {
  background: transparent;
}
.farpa-nav__toggle[aria-expanded="true"] .farpa-nav__toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}
.farpa-nav__toggle[aria-expanded="true"] .farpa-nav__toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Skip link · acessibilidade */
.farpa-skip-link {
  position: absolute;
  top: -3rem;
  left: 0;
  padding: var(--sp-3) var(--sp-4);
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: var(--fw-medium);
  z-index: 100;
  text-decoration: none;
  transition: top var(--motion-fast) var(--ease-standard);
}
.farpa-skip-link:focus-visible {
  top: 0;
  outline: none;
}

/* Mobile · menu colapsa abaixo de 720px */
@media (max-width: 720px) {
  .farpa-nav {
    padding: var(--sp-3) var(--sp-4);
    gap: var(--sp-2);
  }
  .farpa-nav__toggle { display: inline-flex; }
  .farpa-nav__menu { display: none; }
  .farpa-nav[data-mobile-open="true"] .farpa-nav__menu {
    display: flex;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: var(--sp-4);
    gap: var(--sp-1);
    box-shadow: var(--shadow-md);
    z-index: var(--z-nav);
  }
  .farpa-nav[data-mobile-open="true"] .farpa-nav__menu a {
    display: block;
    width: 100%;
    padding: var(--sp-3) var(--sp-2);
    min-height: 2.75rem;
    border-bottom: 1px solid var(--border-subtle);
  }
  .farpa-nav[data-mobile-open="true"] .farpa-nav__menu li:last-child a {
    border-bottom: 0;
  }
}

/* Viewport muito estreito (Galaxy Fold · ≤360px) · oculta separador lang */
@media (max-width: 380px) {
  .farpa-nav { padding-inline: var(--sp-3); }
  .farpa-lang__separator { display: none; }
}

/* Respeita prefers-reduced-motion · sem transição no hamburger */
@media (prefers-reduced-motion: reduce) {
  .farpa-nav__toggle-icon,
  .farpa-nav__toggle-icon::before,
  .farpa-nav__toggle-icon::after {
    transition: none;
  }
}