/* ==========================================================================
   NAV — barra superior, selector de idioma y menú hamburguesa
   ========================================================================== */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  padding: 0 var(--page-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(7, 9, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--amber);
  letter-spacing: 0.5px;
}

.nav-brand span {
  color: var(--text3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text2);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  transition: 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--amber);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.lang-btn {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1px;
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s;
}

.lang-btn:hover {
  border-color: var(--amber);
  color: var(--amber);
}

/* Hamburguesa (solo mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text2);
  border-radius: 2px;
  transition: 0.25s ease;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--amber);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--amber);
}

@media (max-width: 900px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    gap: 0;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(7, 9, 15, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-links.open {
    max-height: 300px;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 18px var(--page-gutter);
    border-bottom: 1px solid var(--border);
    font-size: 13px;
  }
}