/* ==========================================================================
   SPECTRUM ALLIANCE — NAVIGATION
   ========================================================================== */

/* ── Global Nav ──────────────────────────────────────────────────────── */
.sa-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  height: 72px;
  display: flex;
  align-items: center;
  transition: background var(--dur-slow) var(--ease-in-out),
              box-shadow var(--dur-slow) var(--ease-in-out);
}
.sa-nav.scrolled {
  background: rgba(6,8,16,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}
.sa-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-2xl);
  margin-inline: auto;
  padding-inline: var(--space-8);
}

/* Logo */
.sa-nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.sa-nav__logo-img {
  height: 36px;
  width: auto;
}
.sa-nav__logo-text {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  letter-spacing: 0.05em;
  color: var(--sa-white);
  text-transform: uppercase;
}

/* Desktop links */
.sa-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.sa-nav__link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--sa-silver);
  letter-spacing: 0.02em;
  transition: color var(--dur-fast);
  position: relative;
}
.sa-nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--sa-gradient-h);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.sa-nav__link:hover { color: var(--sa-white); }
.sa-nav__link:hover::after { transform: scaleX(1); }
.sa-nav__link.active { color: var(--sa-white); }
.sa-nav__link.active::after { transform: scaleX(1); }

/* Services dropdown */
.sa-nav__dropdown {
  position: relative;
}
.sa-nav__dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--sa-silver);
  cursor: pointer;
  transition: color var(--dur-fast);
}
.sa-nav__dropdown-toggle:hover { color: var(--sa-white); }
.sa-nav__dropdown-toggle svg {
  width: 14px; height: 14px;
  transition: transform var(--dur-fast);
}
.sa-nav__dropdown:hover .sa-nav__dropdown-toggle svg { transform: rotate(180deg); }

.sa-nav__dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-4));
  left: 50%;
  transform: translateX(-50%);
  min-width: 280px;
  background: rgba(10,15,30,0.95);
  backdrop-filter: blur(24px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-3);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity var(--dur-base), transform var(--dur-base) var(--ease-out);
  box-shadow: var(--shadow-xl);
}
.sa-nav__dropdown:hover .sa-nav__dropdown-menu {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.sa-nav__dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  transition: background var(--dur-fast);
  cursor: pointer;
}
.sa-nav__dropdown-item:hover { background: rgba(255,255,255,0.06); }
.sa-nav__dropdown-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.sa-nav__dropdown-label { font-size: var(--text-sm); font-weight: var(--weight-medium); color: var(--sa-light); }
.sa-nav__dropdown-desc  { font-size: var(--text-xs); color: var(--sa-ghost); margin-top: 2px; }

/* CTA button in nav */
.sa-nav__cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* ── Mobile Nav ──────────────────────────────────────────────────────── */
.sa-nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
}
.sa-nav__hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--sa-silver);
  border-radius: 2px;
  transition: all var(--dur-base) var(--ease-out);
}
.sa-nav__hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.sa-nav__hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.sa-nav__hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sa-nav__mobile {
  position: fixed;
  top: 72px; left: 0; right: 0; bottom: 0;
  background: rgba(6,8,16,0.98);
  backdrop-filter: blur(20px);
  z-index: calc(var(--z-nav) - 1);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-16px);
  transition: opacity var(--dur-base), transform var(--dur-base) var(--ease-out);
  overflow-y: auto;
}
.sa-nav__mobile.open {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.sa-nav__mobile-link {
  display: block;
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-xl);
  font-weight: var(--weight-semi);
  color: var(--sa-light);
  border-radius: var(--radius-lg);
  transition: all var(--dur-fast);
}
.sa-nav__mobile-link:hover { background: rgba(255,255,255,0.06); color: var(--sa-white); }
.sa-nav__mobile-divider {
  height: 1px;
  background: rgba(255,255,255,0.08);
  margin-block: var(--space-4);
}
.sa-nav__mobile-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sa-ghost);
  padding: var(--space-2) var(--space-4);
}

@media (max-width: 1024px) {
  .sa-nav__links, .sa-nav__cta .btn { display: none; }
  .sa-nav__hamburger { display: flex; }
}
@media (max-width: 640px) {
  .sa-nav__inner { padding-inline: var(--space-4); }
}