/* ── SITE NAV ── quiet fixed bar, logo left / links centre / cta right ── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: rgba(15, 17, 19, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.25s ease;
}

.nav--scrolled {
  background: rgba(15, 17, 19, 0.97);
}

.nav--open {
  z-index: 400;
}

.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  height: var(--nav-height);
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: var(--tracking-body);
  color: var(--color-pure-white);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__links {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.25rem, 2vw, 1.875rem);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: var(--tracking-body-sm);
  transition: color 0.2s;
  white-space: nowrap;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-secondary);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 clamp(12px, 1.5vw, 16px);
  height: 34px;
  border-radius: var(--radius-buttons);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-bg-base);
  border: 1px solid var(--color-action);
  background: var(--color-action);
  color: var(--color-text-inverse);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition:
    background-color 160ms var(--ease-standard),
    border-color 160ms var(--ease-standard),
    transform 160ms var(--ease-standard);
}

.nav__cta:hover {
  border-color: var(--color-action-hover);
  background: var(--color-action-hover);
}

.nav__cta:active {
  background: var(--color-action-pressed);
}

/* Mobile hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  margin-left: auto;
}

.nav__hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-frost);
  transition: transform 0.3s, opacity 0.3s;
  transform-origin: center;
}

.nav--open .nav__hamburger span:nth-child(1) { transform: rotate(45deg) translateY(6.5px); }
.nav--open .nav__hamburger span:nth-child(2) { opacity: 0; }
.nav--open .nav__hamburger span:nth-child(3) { transform: rotate(-45deg) translateY(-6.5px); }

/* Mobile overlay — full screen below nav bar */
.nav__overlay {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: auto;
  z-index: var(--z-overlay);
  height: calc(100vh - var(--nav-height));
  height: calc(100dvh - var(--nav-height));
  background: var(--color-bg-base);
  flex-direction: column;
  align-items: flex-start;
  padding: var(--spacing-20) var(--container-pad-m) max(var(--spacing-24), env(safe-area-inset-bottom));
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0s linear 0.2s;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.nav__overlay .nav__link {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--spacing-12) 0;
  border-bottom: 1px solid var(--color-border);
  width: 100%;
  display: block;
}

.nav__overlay .nav__link--cta {
  color: var(--color-accent);
  border-bottom: none;
  margin-top: 1.5rem;
}

.nav--open .nav__overlay {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
  transition-delay: 0s;
}

/* ── DROPDOWN ── */
.nav__dropdown {
  position: relative;
}

.nav__dropdown::before {
  content: '';
  position: absolute;
  top: 100%;
  left: -16px;
  right: -16px;
  height: 12px;
}

.nav__dropdown-trigger {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: var(--tracking-body-sm);
  white-space: nowrap;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  text-decoration: none;
  transition: color 0.2s;
}

.nav__dropdown-trigger::after {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  transition: transform 0.2s;
}

.nav__dropdown:hover .nav__dropdown-trigger,
.nav__dropdown:focus-within .nav__dropdown-trigger {
  color: var(--color-text-secondary);
}

.nav__dropdown:hover .nav__dropdown-trigger::after,
.nav__dropdown:focus-within .nav__dropdown-trigger::after {
  transform: rotate(-135deg) translateY(2px);
}

.nav__dropdown-trigger--active {
  color: var(--color-text-secondary);
}

.nav__submenu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 220px;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card), 0 24px 48px -20px rgba(0, 0, 0, 0.6);
  list-style: none;
  padding: 0.375rem;
  margin: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms var(--ease-standard), transform 180ms var(--ease-standard);
  z-index: 10;
}

.nav__dropdown:hover .nav__submenu,
.nav__dropdown:focus-within .nav__submenu {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}

.nav__sublink {
  display: block;
  border-radius: calc(var(--radius-lg) - 3px);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 0.5rem 0.625rem;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.nav__sublink:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-elevated);
}

/* Mobile overlay — Industries group */
.nav__overlay-group-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--spacing-20) 0 var(--spacing-8);
  display: block;
  width: 100%;
}

.nav__overlay .nav__link--sub {
  font-size: 0.9375rem;
  padding-left: 0.625rem;
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__overlay {
    display: flex;
  }
}