/*
 * VRPL Website - Navigation System
 * Redwood Materials-inspired navigation with overlay menu
 */

/* ========================================
   MAIN HEADER
   ======================================== */

.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-fixed);
  background: rgba(46, 46, 46, 0.95);
  backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid rgba(156, 106, 74, 0.3);
  transform: translateY(-100%);
  transition: transform var(--transition-base);
}

.main-header.visible {
  transform: translateY(0);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-logo img {
  height: 40px;
  width: auto;
}

/* ========================================
   BREADCRUMB NAVIGATION
   ======================================== */

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

.breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--space-xs) 0;
}

.breadcrumb-link:hover,
.breadcrumb-link.active {
  color: var(--copper-light);
}

.breadcrumb-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--copper-medium), var(--light-green));
}

.breadcrumb-separator {
  color: var(--industrial-silver);
  font-size: var(--text-sm);
  user-select: none;
}

/* ========================================
   HAMBURGER MENU TRIGGER
   ======================================== */

.menu-trigger {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: calc(var(--z-overlay) + 1);
  position: relative;
}

.hamburger-line {
  width: 28px;
  height: 2px;
  background: var(--copper-medium);
  transition: all var(--transition-base);
  border-radius: var(--radius-full);
}

.menu-trigger:hover .hamburger-line {
  background: var(--copper-light);
  box-shadow: var(--shadow-glow-copper);
}

.menu-trigger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translateY(8px);
}

.menu-trigger.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.menu-trigger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translateY(-8px);
}

/* ========================================
   FULL-SCREEN OVERLAY MENU
   ======================================== */

.overlay-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-overlay);
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.overlay-menu.active {
  visibility: visible;
  opacity: 1;
}

/* Overlay Background with Image */
.overlay-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transition: opacity var(--transition-slow);
  background-color: var(--background-dark);
}

.overlay-background::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-overlay);
  z-index: 1;
}

/* Overlay Content */
.overlay-content {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 120px var(--space-2xl) var(--space-3xl);
  max-width: 1200px;
  margin: 0 auto;
  overflow-y: auto;
  overflow-x: hidden;
  /* Custom scrollbar styling */
  scrollbar-width: thin;
  scrollbar-color: var(--copper-medium) rgba(46, 46, 46, 0.3);
}

/* Webkit scrollbar styling */
.overlay-content::-webkit-scrollbar {
  width: 8px;
}

.overlay-content::-webkit-scrollbar-track {
  background: rgba(46, 46, 46, 0.3);
  border-radius: var(--radius-full);
}

.overlay-content::-webkit-scrollbar-thumb {
  background: var(--copper-medium);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

.overlay-content::-webkit-scrollbar-thumb:hover {
  background: var(--copper-light);
}

/* Close Button */
.overlay-close {
  position: fixed;
  top: var(--space-xl);
  right: var(--space-xl);
  background: transparent;
  border: 2px solid var(--copper-medium);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: calc(var(--z-overlay) + 10);
}

.close-icon {
  font-size: 32px;
  color: var(--copper-light);
  line-height: 1;
  font-weight: var(--weight-normal);
}

.overlay-close:hover {
  background: var(--copper-medium);
  box-shadow: var(--shadow-glow-green);
  transform: rotate(90deg);
}

.overlay-close:hover .close-icon {
  color: var(--text-primary);
}

/* Menu Navigation Container */
.overlay-nav {
  width: 100%;
}

/* Menu Links */
.overlay-menu-list {
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
}

.overlay-menu-item {
  margin-bottom: var(--space-lg);
  transform: translateX(-50px);
  opacity: 0;
  transition: all var(--transition-base);
}

.overlay-menu.active .overlay-menu-item {
  transform: translateX(0);
  opacity: 1;
}

/* Stagger animation for menu items */
.overlay-menu.active .overlay-menu-item:nth-child(1) { transition-delay: 0.1s; }
.overlay-menu.active .overlay-menu-item:nth-child(2) { transition-delay: 0.15s; }
.overlay-menu.active .overlay-menu-item:nth-child(3) { transition-delay: 0.2s; }
.overlay-menu.active .overlay-menu-item:nth-child(4) { transition-delay: 0.25s; }
.overlay-menu.active .overlay-menu-item:nth-child(5) { transition-delay: 0.3s; }
.overlay-menu.active .overlay-menu-item:nth-child(6) { transition-delay: 0.35s; }
.overlay-menu.active .overlay-menu-item:nth-child(7) { transition-delay: 0.4s; }
.overlay-menu.active .overlay-menu-item:nth-child(8) { transition-delay: 0.45s; }

/* Menu Link Styling */
.overlay-link {
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: var(--space-lg);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  transition: all var(--transition-base);
  position: relative;
  font-family: var(--font-display);
  padding: var(--space-sm) 0;
}

.link-number {
  font-size: var(--text-lg);
  color: var(--copper-medium);
  font-weight: var(--weight-medium);
  font-family: var(--font-mono);
}

.link-text {
  position: relative;
}

.overlay-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-xl);
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--copper-medium), var(--light-green));
  transition: width var(--transition-base);
}

.overlay-link:hover {
  color: var(--copper-light);
  text-shadow: 0 0 20px rgba(167, 200, 161, 0.5);
  transform: translateX(20px);
}

.overlay-link:hover::after {
  width: 100px;
}

.overlay-link:hover .link-number {
  color: var(--light-green);
}

/* Overlay Footer */
.overlay-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(156, 106, 74, 0.2);
}

.overlay-contact {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-lg);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.overlay-contact:hover {
  color: var(--copper-light);
}

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

@media (max-width: 1024px) {
  .breadcrumb-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: var(--space-sm) var(--space-md);
  }

  .overlay-content {
    padding: 100px var(--space-lg) var(--space-3xl);
  }

  .overlay-link {
    font-size: var(--text-2xl);
  }

  .overlay-close {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    width: 50px;
    height: 50px;
  }

  .close-icon {
    font-size: 24px;
  }

  .overlay-footer {
    margin-top: var(--space-lg);
    padding-bottom: var(--space-2xl);
  }

  .overlay-contact {
    font-size: var(--text-base);
  }
}