/* =========================================================
   NAVIGATION
   ========================================================= */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--t-mid), box-shadow var(--t-mid);
}

.site-nav.scrolled {
  background: rgba(13, 27, 42, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,.06);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
}

.nav-logo__mark {
  width: 40px;
  height: 40px;
  background: var(--clr-teal);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-logo__mark svg {
  width: 22px;
  height: 22px;
  fill: var(--clr-white);
}

.nav-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-logo__name {
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--clr-white);
  letter-spacing: 0.02em;
}

.nav-logo__tagline {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-teal);
}

/* Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav-link {
  position: relative;
  padding: var(--sp-2) var(--sp-3);
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255,255,255,.82);
  border-radius: var(--r-sm);
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--clr-white);
  background: rgba(255,255,255,.07);
}

/* Dropdown trigger */
.nav-link--dropdown {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link--dropdown .chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--t-fast);
  flex-shrink: 0;
  opacity: .7;
}

.nav-item:hover .chevron,
.nav-item:focus-within .chevron {
  transform: rotate(180deg);
}

/* Mega-dropdown */
.nav-item {
  position: relative;
}

.nav-item::after {
  content: "";
  position: absolute;
  left: -12px;
  right: -12px;
  top: 100%;
  height: 18px;
  display: block;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--clr-charcoal-2);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--r-md);
  padding: var(--sp-6);
  display: grid;
  grid-template-columns: repeat(4, 200px);
  gap: var(--sp-4);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity var(--t-fast), transform var(--t-fast);
  box-shadow: var(--shadow-lg);
  min-width: 860px;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown,
.nav-item.is-open .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-item.is-open .chevron {
  transform: rotate(180deg);
}

.nav-dropdown__item {
  display: block;
  padding: var(--sp-4);
  border-radius: var(--r-sm);
  transition: background var(--t-fast);
}

.nav-dropdown__item:hover {
  background: rgba(255,255,255,.06);
}

.nav-dropdown__title {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: var(--sp-1);
}

.nav-dropdown__desc {
  font-size: 0.75rem;
  color: var(--clr-grey-mid);
  line-height: 1.4;
}

.nav-dropdown__spec {
  font-size: 0.7rem;
  color: var(--clr-teal);
  font-weight: 500;
  margin-top: var(--sp-1);
}

/* Right section */
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* CTA button in nav */
.nav-cta {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

/* Hamburger - mobile */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  padding: var(--sp-2);
}

.nav-hamburger span {
  display: block;
  height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: transform var(--t-mid), opacity var(--t-fast);
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--clr-charcoal);
  z-index: 999;
  padding: calc(var(--nav-h) + var(--sp-8)) var(--sp-6) var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--t-mid);
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-menu__link {
  padding: var(--sp-4);
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--clr-white);
  border-bottom: 1px solid rgba(255,255,255,.07);
}

.mobile-menu__sub {
  padding: var(--sp-3) var(--sp-6);
  font-size: 0.9rem;
  color: var(--clr-grey-mid);
}

.mobile-menu__cta {
  margin-top: var(--sp-6);
  width: 100%;
  text-align: center;
  padding: 1rem;
}

/* ----------------------------------------------------------
   Responsive
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-cta { display: none; }
}