/* Modern Professional Navigation */

.site-nav {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.02);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  border-bottom: 1px solid var(--color-border, #e2e8f0);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

.site-nav.scrolled {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.875rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-logo {
  height: 36px;
  width: auto;
  transition: transform 0.2s ease;
}

.nav-logo:hover {
  transform: scale(1.05);
}

.nav-title {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: 700;
  color: var(--color-text, #1e293b);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: color 0.2s ease;
}

.nav-title:hover {
  color: var(--color-primary, #2563eb);
}

/* Mobile toggle button */
.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  gap: 5px;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.nav-toggle:hover {
  background: var(--color-bg-alt, #f8fafc);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-focus, #2563eb);
  outline-offset: 2px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text, #1e293b);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 2px;
}

/* Animated hamburger to X */
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Navigation menu */
.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
  align-items: center;
}

.nav-item {
  margin: 0;
}

.nav-link {
  color: var(--color-text-muted, #64748b);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
  position: relative;
}

/* Subtle hover effect */
.nav-link:hover {
  background: var(--color-bg-alt, #f8fafc);
  color: var(--color-text, #1e293b);
  transform: translateY(-1px);
}

/* Focus state for keyboard navigation */
.nav-link:focus-visible {
  outline: 2px solid var(--color-focus, #2563eb);
  outline-offset: 2px;
  background: var(--color-bg-alt, #f8fafc);
}

/* Active state */
.nav-link.active {
  color: var(--color-primary, #2563eb);
  background: color-mix(in srgb, var(--color-primary, #2563eb) 8%, transparent);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary, #2563eb);
  border-radius: 2px 2px 0 0;
}

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

  .nav-container {
    padding: 0.75rem 1.5rem;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    padding: 1rem 0;
    gap: 0.25rem;
    border-bottom: 1px solid var(--color-border, #e2e8f0);
  }

  .nav-menu.active {
    display: flex;
    animation: slideDown 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 0.875rem 1.5rem;
    border-radius: 0;
    font-size: 1rem;
  }

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

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 1024px) {
  .nav-container {
    padding: 0.875rem 1.5rem;
  }

  .nav-menu {
    gap: 0.25rem;
  }

  .nav-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .site-nav,
  .nav-logo,
  .nav-title,
  .nav-toggle,
  .nav-toggle span,
  .nav-link {
    transition: none;
  }

  .nav-menu.active {
    animation: none;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .site-nav {
    border-bottom: 2px solid currentColor;
  }

  .nav-link:focus-visible {
    outline-width: 3px;
  }
}