.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  transition: height var(--transition-normal), box-shadow var(--transition-normal);
}

.nav.scrolled {
  height: 60px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.6);
}

.nav__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* Brand */
.nav__brand {
  text-decoration: none;
  display: flex;
  align-items: center;
  flex-shrink: 0;
  /* fallback text styles (used by non-logo pages) */
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  white-space: nowrap;
  gap: var(--space-2);
}

.nav__brand span {
  color: var(--color-accent);
  font-size: var(--text-sm);
}

.nav__brand:hover {
  color: var(--color-text-primary);
}

/* Logo image in nav: white bg blends away on the dark nav via multiply */
.nav__logo-img {
  height: 48px;
  width: auto;
  display: block;
  mix-blend-mode: multiply;
  /* Slight brightness boost to keep red vivid after multiply */
  filter: brightness(1.05);
  transition: opacity var(--transition-fast);
}

.nav__brand:hover .nav__logo-img {
  opacity: 0.85;
}

.nav.scrolled .nav__logo-img {
  height: 40px;
}

/* Menu */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  text-decoration: none;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text-primary);
  background-color: var(--color-surface-3);
}

.nav__link--cta {
  background-color: var(--color-accent);
  color: var(--color-black) !important;
  font-weight: var(--fw-bold);
  padding: var(--space-2) var(--space-4);
  margin-left: var(--space-2);
}

.nav__link--cta:hover {
  background-color: var(--color-accent-light);
  color: var(--color-black) !important;
}

/* Dropdown */
.nav__item--dropdown {
  position: relative;
}

.nav__dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav__dropdown-toggle:hover,
.nav__item--dropdown.open .nav__dropdown-toggle {
  color: var(--color-text-primary);
  background-color: var(--color-surface-3);
}

.nav__dropdown-arrow {
  font-size: 10px;
  transition: transform var(--transition-fast);
}

.nav__item--dropdown.open .nav__dropdown-arrow {
  transform: rotate(180deg);
}

.nav__dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-top: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-1);
  padding: var(--space-3);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  z-index: var(--z-dropdown);
}

.nav__item--dropdown.open .nav__dropdown,
.nav__item--dropdown:hover .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--fw-bold);
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__dropdown-link:hover {
  color: var(--color-accent);
  background-color: var(--color-surface-3);
}

/* Mobile toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
  transition: border-color var(--transition-fast);
}

.nav__toggle:hover {
  border-color: var(--color-accent);
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-secondary);
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-fast);
}

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

/* Mobile overlay */
.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: calc(var(--z-nav) - 1);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.nav__overlay.visible {
  opacity: 1;
}

/* Responsive */
@media (max-width: 900px) {
  .nav__toggle {
    display: flex;
  }

  .nav__overlay {
    display: block;
  }

  .nav__menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background-color: var(--color-surface);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-16) var(--space-4) var(--space-8);
    overflow-y: auto;
    z-index: var(--z-nav);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
  }

  .nav__menu.open {
    transform: translateX(0);
  }

  .nav__link,
  .nav__dropdown-toggle {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    border-radius: 0;
    border-bottom: 1px solid var(--color-border);
    width: 100%;
    justify-content: space-between;
  }

  .nav__link--cta {
    margin: var(--space-6) 0 0 0;
    text-align: center;
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    border-bottom: none;
  }

  .nav__dropdown {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    border-top: none;
    border-radius: 0;
    min-width: 0;
    grid-template-columns: 1fr;
    background-color: var(--color-surface-2);
    padding: var(--space-2) var(--space-4);
    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    transition: max-height var(--transition-slow);
  }

  .nav__item--dropdown.open .nav__dropdown {
    max-height: 600px;
    transform: none;
  }

  .nav__dropdown-link {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }
}