/* ===================================================================
   NAVIGATION.CSS - Navigation Bar and Mobile Menu Styles
   Portfolio Website for Eric Koens
   =================================================================== */

/* ===================================================================
   MAIN NAVIGATION BAR
   =================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 70px;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-sticky);
  transition: box-shadow var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 var(--section-padding-horizontal);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo / Brand */
.navbar-brand {
  font-size: 24px;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.navbar-brand:hover {
  color: var(--color-secondary);
}

/* ===================================================================
   DESKTOP NAVIGATION MENU
   =================================================================== */

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-menu li {
  margin: 0;
}

.navbar-link {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.navbar-link:hover {
  color: var(--color-primary);
  background-color: rgba(30, 58, 138, 0.05);
}

/* Active page indicator */
.navbar-link.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.navbar-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: var(--spacing-sm);
  right: var(--spacing-sm);
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

/* Focus state for accessibility */
.navbar-link:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ===================================================================
   MOBILE MENU TOGGLE (Hamburger)
   =================================================================== */

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

.navbar-toggle:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.navbar-toggle-bar {
  width: 28px;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
  transform-origin: center;
}

/* Hamburger animation when open */
.navbar-toggle.active .navbar-toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.navbar-toggle.active .navbar-toggle-bar:nth-child(2) {
  opacity: 0;
}

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

/* ===================================================================
   MOBILE RESPONSIVE NAVIGATION
   =================================================================== */

@media (max-width: 768px) {
  /* Show hamburger menu toggle */
  .navbar-toggle {
    display: flex;
  }

  /* Hide desktop menu by default */
  .navbar-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md) 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition-normal), opacity var(--transition-normal);
  }

  /* Show mobile menu when active */
  .navbar-menu.active {
    max-height: 500px;
    opacity: 1;
  }

  .navbar-menu li {
    width: 100%;
  }

  .navbar-link {
    display: block;
    padding: var(--spacing-md) var(--section-padding-horizontal);
    border-radius: 0;
    border-left: 3px solid transparent;
  }

  .navbar-link:hover,
  .navbar-link.active {
    background-color: var(--color-background-alt);
    border-left-color: var(--color-primary);
  }

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

/* ===================================================================
   TABLET ADJUSTMENTS
   =================================================================== */

@media (min-width: 769px) and (max-width: 1024px) {
  .navbar-menu {
    gap: var(--spacing-md);
  }

  .navbar-link {
    font-size: var(--font-size-small);
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}

/* ===================================================================
   UTILITY CLASSES FOR NAVIGATION
   =================================================================== */

/* Offset content to account for fixed navbar */
.navbar-offset {
  padding-top: 70px;
}

/* Skip to main content link for accessibility */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: var(--spacing-md);
  background-color: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  text-decoration: none;
  z-index: var(--z-modal);
  transition: top var(--transition-fast);
}

.skip-to-main:focus {
  top: var(--spacing-md);
}