/* ============================================
   HEADER.CSS - GG-299-783 LIMITED Site Header
   ============================================ */

/* Header Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-graphite-100);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  font-family: var(--font-family-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-graphite-900);
  text-transform: uppercase;
  letter-spacing: var(--letter-tracking-adventure);
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-primary);
}

.logo-text {
  position: relative;
}

.logo-text::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.logo:hover .logo-text::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Navigation */
.main-navigation {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: var(--space-2) 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-graphite-700);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-graphite-800);
  margin: 3px 0;
  transition: all var(--transition-base);
  border-radius: var(--radius-full);
}

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

  .main-navigation {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-white);
    padding: var(--space-6) var(--space-4);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    border-top: 1px solid var(--color-graphite-100);
  }

  .main-navigation.is-open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    gap: var(--space-4);
    width: 100%;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid var(--color-graphite-100);
  }

  .nav-link {
    padding: var(--space-4) 0;
    font-size: var(--font-size-lg);
  }

  /* Hamburger animation when open */
  .menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}

/* Focus visible for keyboard navigation */
.menu-toggle:focus-visible,
.nav-link:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .main-navigation {
    transition: none;
  }
  
  .hamburger-line {
    transition: none;
  }
}