/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(5, 5, 6, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: var(--z-sticky);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--duration-normal) var(--ease-out);
}

.nav--scrolled {
  background: rgba(10, 10, 15, 0.9);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--text-primary);
}

.nav__logo img {
  height: 40px;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav__logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
}

/* Menu */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  transition: color var(--duration-fast) var(--ease-out);
  cursor: pointer;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

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

.nav__link--active {
  font-weight: 600;
}

/* Dropdown chevron */
.nav__chevron {
  transition: transform var(--duration-fast) var(--ease-out);
}

.nav__item--dropdown[data-open="true"] .nav__chevron {
  transform: rotate(180deg);
}

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 340px;
  background: var(--bg-elevated);
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal);
  list-style: none;
  margin: 0;
}

.nav__item--dropdown {
  position: relative;
}

.nav__item--dropdown[data-open="true"] .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--btn-radius);
  text-decoration: none;
  color: var(--text-primary);
  transition: background-color var(--duration-fast) var(--ease-out);
}

.nav__dropdown-item:hover,
.nav__dropdown-item:focus-visible {
  background-color: var(--bg-alt);
}

.nav__dropdown-name {
  display: block;
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: 2px;
}

.nav__dropdown-desc {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--duration-normal) var(--ease-out);
  border-radius: 1px;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile overlay */
.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-sticky) - 1);
}

/* Mobile */
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 300px;
    max-width: 85vw;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-alt);
    padding: var(--space-16) var(--space-6) var(--space-6);
    box-shadow: var(--shadow-lg);
    border-left: 1px solid var(--glass-border);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-sticky);
    overflow-y: auto;
  }

  .nav__menu[data-open="true"] {
    transform: translateX(0);
  }

  .nav__overlay[data-open="true"] {
    display: block;
  }

  .nav__link {
    padding: var(--space-3) 0;
    font-size: var(--text-base);
  }

  .nav__item--dropdown {
    position: static;
  }

  .nav__dropdown {
    position: static;
    transform: none;
    min-width: 0;
    border: none;
    box-shadow: none;
    padding: 0 0 0 var(--space-4);
    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    transition: max-height var(--duration-slow) var(--ease-out);
  }

  .nav__item--dropdown[data-open="true"] .nav__dropdown {
    max-height: 400px;
    transform: none;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .nav__dropdown,
  .nav__menu,
  .nav__chevron,
  .nav__hamburger span {
    transition: none;
  }

  .nav__item--dropdown[data-open="true"] .nav__dropdown {
    transform: translateX(-50%) translateY(0);
  }
}