/* Header Styles - Pixel 360 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-bg-overlay);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--duration-normal) var(--ease-out);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5rem;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-xl);
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
}

.brand-accent {
  color: var(--color-primary);
}

.main-nav {
  display: none;
}

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

.nav-list a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--duration-normal) var(--ease-out);
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--color-text);
}

.nav-list a:hover::after,
.nav-list a:focus::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2.5rem;
  height: 2.5rem;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--duration-normal) var(--ease-out);
  transform-origin: center;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.main-nav.active {
  display: flex;
  position: fixed;
  top: 5rem;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg);
  flex-direction: column;
  padding: var(--space-8) var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

.main-nav.active .nav-list {
  flex-direction: column;
  gap: var(--space-6);
  align-items: flex-start;
  background: var(--color-bg);
}

.main-nav.active .nav-list a {
  font-size: var(--text-2xl);
  font-weight: 600;
}

@media (min-width: 1024px) {
  .main-nav {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
  
  .header-container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .header-container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}