nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

.nav-logo:hover {
  color: var(--color-accent-2);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-8);
}

.nav-links a {
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 600;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-accent);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-links a.active {
  color: var(--color-accent);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  gap: 6px;
}

.hamburger span {
  width: 24px;
  height: 3px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

.hamburger.active {
  display: none;
}

/* Mobile Menu */
.nav-menu-mobile {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 50;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
  display: flex;
  flex-direction: column;
  padding: 0 var(--space-8);
  gap: 0;
}

.nav-menu-mobile.active {
  max-height: 500px;
  padding: var(--space-6) var(--space-8);
}

.nav-menu-mobile a {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.nav-menu-mobile a:last-of-type {
  border-bottom: none;
}

.nav-menu-mobile a:hover {
  color: var(--color-accent);
}

.nav-menu-mobile-close {
  display: none;
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--text-2xl);
  color: var(--color-text);
  padding: 0;
  width: 24px;
  height: 24px;
  transition: color var(--transition-fast);
}

.nav-menu-mobile-close:hover {
  color: var(--color-accent);
}

.nav-menu-mobile.active .nav-menu-mobile-close {
  display: block;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .nav-container {
    padding: var(--space-3) var(--space-6);
  }
}