/* =========================================================
   navigation.css
   SecureLynx Header / Navigation
   ========================================================= */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-overlay);
  padding: 22px 0;
  background: rgba(5, 7, 13, 0.46);
  border-bottom: 1px solid rgba(0, 230, 255, 0.08);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition:
    padding var(--transition-medium),
    background var(--transition-medium),
    border-color var(--transition-medium);
}

.site-header.scrolled {
  padding: 14px 0;
  background: rgba(5, 7, 13, 0.86);
  border-bottom-color: rgba(0, 230, 255, 0.18);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}

.nav-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.nav-wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.nav-wordmark strong {
  font-size: 1.28rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-wordmark span {
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 0.58rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-link {
  position: relative;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -9px;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: center;
  opacity: 0;
  transition:
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  opacity: 1;
}

.nav-actions {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

/* Mobile/tablet: keep navigation available instead of hiding it. */
@media (max-width: 1050px) {
  .site-header {
    padding: 14px 0 12px;
  }

  .site-header.scrolled {
    padding: 10px 0;
  }

  .nav-shell {
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .nav-links {
    order: 3;
    display: flex;
    width: 100%;
    max-width: 100%;
    gap: 20px;
    padding: 8px 0 2px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    flex: 0 0 auto;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
  }

  .nav-link::after {
    bottom: -5px;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 12px 0 10px;
  }

  .nav-shell {
    gap: 10px 14px;
  }

  .nav-logo {
    gap: 10px;
    min-width: 0;
  }

  .nav-logo img {
    width: 38px;
    height: 38px;
  }

  .nav-wordmark span {
    display: none;
  }

  .nav-wordmark strong {
    font-size: 0.95rem;
    letter-spacing: 0.06em;
  }

  .nav-actions .btn {
    padding: 0.7rem 0.85rem;
    font-size: 0.64rem;
    letter-spacing: 0.08em;
  }

  .nav-links {
    gap: 16px;
    padding-top: 6px;
  }
}

@media (max-width: 420px) {
  .nav-actions .btn {
    padding: 0.64rem 0.7rem;
    font-size: 0.58rem;
  }

  .nav-wordmark strong {
    font-size: 0.86rem;
  }

  .nav-logo img {
    width: 34px;
    height: 34px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: flex !important;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px 22px;
    width: 100%;
    overflow: visible;
  }

  .nav-links a {
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    white-space: nowrap;
  }
}

@media (max-width: 420px) {
  .nav-links {
    gap: 12px 16px;
  }

  .nav-links a {
    font-size: 0.68rem;
    letter-spacing: 0.1em;
  }
}