/* ============================================
   HEADER.CSS - TechnoFiksator Header Styles
   Industrial, Responsive, Accessible
   ============================================ */

/* Header Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-background);
  border-bottom: 2px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5rem;
}

/* Logo */
.logo {
  display: inline-flex;
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-2xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

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

.logo-accent {
  color: var(--color-accent);
}

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

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

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) 0;
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--duration-fast) var(--ease-default), border-color var(--duration-fast) var(--ease-default);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.nav-cta {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-base);
  border: 2px solid var(--color-accent);
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: transparent;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-default), background-color var(--duration-fast) var(--ease-default);
}

.mobile-menu-toggle:hover {
  border-color: var(--color-accent);
  background-color: var(--gray-50);
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.hamburger-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  background-color: var(--color-text);
  margin: 2px 0;
  transition: transform var(--duration-base) var(--ease-default), opacity var(--duration-base) var(--ease-default);
}

/* Mobile Styles */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 5rem;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-4);
    background-color: var(--color-background);
    border-top: 2px solid var(--gray-200);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-default);
    overflow-y: auto;
  }
  
  .nav-list.is-open {
    transform: translateX(0);
  }
  
  .nav-item {
    width: 100%;
    border-bottom: 1px solid var(--gray-200);
  }
  
  .nav-link {
    display: block;
    width: 100%;
    padding: var(--space-4) 0;
    font-size: var(--text-lg);
    border-bottom: none;
  }
  
  .nav-link:hover,
  .nav-link:focus-visible {
    padding-left: var(--space-2);
    border-left: 4px solid var(--color-accent);
    border-bottom: none;
  }
  
  .nav-cta {
    margin-top: var(--space-4);
    text-align: center;
    border-left: none;
  }
  
  /* Hamburger Animation */
  .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* Focus Visible Enhancement for Keyboard Navigation */
@media (prefers-reduced-motion: reduce) {
  .nav-list {
    transition: none;
  }
}