/*
 * Hidrocarburos del Norte — Navbar (multipágina)
 * Header fijo, transparente sobre el hero y sólido al hacer scroll.
 * Depende de tokens.css + base.css.
 */

.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: var(--z-nav);
  padding-block: var(--space-4);
  transition: background-color var(--transition-base), padding var(--transition-base), box-shadow var(--transition-base);
}
/* Header sólido: al hacer scroll, o siempre en páginas internas (.site-header--solid) */
.site-header.is-scrolled,
.site-header--solid {
  background-color: rgba(6, 15, 26, .92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-md);
  padding-block: var(--space-2);
}

.navbar {
  width: 100%; max-width: 1240px; margin-inline: auto;
  padding-inline: var(--section-padding-x);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-6);
}

/* ── Marca ── */
.navbar__brand { display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0; }
.navbar__logo {
  height: 48px; width: auto; object-fit: contain;
  /* Halo blanco fuerte y de borde definido (dureza ~70%) + leve profundidad */
  filter:
    drop-shadow(0 0 2px rgba(255,255,255,.95))
    drop-shadow(0 0 4px rgba(255,255,255,.85))
    drop-shadow(0 0 7px rgba(255,255,255,.55))
    drop-shadow(0 1px 2px rgba(0,0,0,.45));
  transition: height var(--transition-base);
}
.is-scrolled .navbar__logo, .site-header--solid .navbar__logo { height: 40px; }

/* Wordmark tipográfico — dos líneas, mismo tipo y peso (unificado) */
.navbar__brand-text { display: flex; flex-direction: column; line-height: 1; }
.navbar__brand-text span {
  font-family: var(--font-brand);
  font-weight: var(--weight-bold);
  font-size: 1.02rem;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--color-limestone-100);
}
@media (max-width: 480px) { .navbar__brand-text { display: none; } }
@media (max-width: 420px) { .navbar__brand-text { display: none; } }

/* ── Enlaces ── */
.navbar__links { display: flex; align-items: center; gap: var(--space-8); }
.navbar__link {
  position: relative; color: var(--color-limestone-200);
  font-size: var(--text-sm); font-weight: var(--weight-medium); letter-spacing: .01em;
}
.navbar__link::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -6px;
  height: 2px; background: var(--accent); transition: right var(--transition-base);
}
.navbar__link:hover, .navbar__link[aria-current="page"], .navbar__link.is-active { color: var(--accent); }
.navbar__link:hover::after, .navbar__link[aria-current="page"]::after, .navbar__link.is-active::after { right: 0; }

.navbar__cta {
  padding: var(--space-2) var(--space-4);
  border: 1px solid rgba(255,255,255,.24); border-radius: var(--radius-pill);
  background: rgba(255,255,255,.08); color: var(--color-limestone-100);
  display: inline-flex; align-items: center; gap: var(--space-2);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}
.navbar__cta::after { display: none; }
.navbar__cta:hover { background: var(--accent); border-color: var(--accent); color: var(--color-petroleum-800); }
.navbar__cta svg { width: 1em; height: 1em; }

/* ── Toggle de tema ── */
.theme-toggle {
  width: 40px; height: 40px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.06);
  color: var(--color-limestone-100);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
.theme-toggle:hover { background: var(--accent); color: var(--color-petroleum-800); }
.theme-toggle svg { width: 20px; height: 20px; }
.navbar__actions { display: flex; align-items: center; gap: var(--space-3); }

/* ── Hamburguesa ── */
.navbar__toggle { display: none; padding: var(--space-2); z-index: calc(var(--z-nav) + 1); }
.navbar__toggle span {
  display: block; width: 26px; height: 2px; background: var(--color-limestone-100);
  margin: 6px 0; border-radius: 2px; transition: transform var(--transition-base), opacity var(--transition-fast);
}
.navbar__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.navbar__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.navbar__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ── Móvil ── */
@media (max-width: 900px) {
  .navbar__toggle { display: block; }
  .navbar__links {
    position: fixed; inset: 0 0 auto 0;
    background: var(--color-petroleum-900);
    flex-direction: column; align-items: stretch;
    gap: var(--space-2); padding: calc(var(--space-20) + var(--space-4)) var(--section-padding-x) var(--space-10);
    transform: translateY(-110%); transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
  }
  .navbar__links.is-open { transform: translateY(0); }
  .navbar__link { padding: var(--space-3) 0; font-size: var(--text-lg); }
  .navbar__link::after { display: none; }
  .navbar__cta { margin-top: var(--space-3); justify-content: center; }
}