.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* Logo */
.nav-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

/* Mobile Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 28px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: var(--z-modal);
}

.nav-toggle span {
  width: 28px;
  height: 3px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(8px);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-8px);
}

/* Navigation Links */
.nav-links {
  display: none;
  gap: var(--spacing-sm);
}

.nav-link {
  position: relative;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

.nav-link.active::after {
  width: 80%;
}

.nav-link:hover::after {
  width: 60%;
}

/* Desktop Navigation */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-links {
    display: flex;
  }
}

/* Mobile Navigation */
@media (max-width: 767px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    padding: var(--spacing-xl);
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-base);
  }

  .nav-links.active {
    display: flex;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-link {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link.active {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
  }

  .btn-sm {
    display: none;
  }
}

/* Breadcrumb Navigation */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.breadcrumb-item a {
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.breadcrumb-item a:hover {
  color: var(--color-accent);
}

.breadcrumb-separator {
  color: var(--color-text-light);
}

.breadcrumb-item.active {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Sticky Navigation Enhancement */
body {
  padding-top: 72px;
}

/* Smooth scroll offset for anchor links */
:target {
  scroll-margin-top: 80px;
}