/* ===== Header Component ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--color-bg-deep);
  border-bottom: 1px solid var(--color-border-subtle);
  height: 60px;
  display: flex;
  align-items: center;
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-s);
  text-decoration: none;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.logo-mark {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1.2;
  color: var(--color-text-primary);
  white-space: nowrap;
}

/* Navigation toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-s);
  cursor: pointer;
  color: var(--color-text-primary);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-icon {
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before {
  top: -8px;
}

.nav-toggle-icon::after {
  top: 8px;
}

/* Open state */
.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: translateY(-8px) rotate(-45deg);
}

/* Primary navigation */
.primary-navigation {
  display: flex;
  align-items: center;
}

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

.nav-list li {
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: block;
  padding: var(--space-xs) 0;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, text-shadow 0.2s ease;
  position: relative;
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent-neon);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.2s ease;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-accent-neon);
  text-shadow: 0 0 8px var(--color-glow-neon);
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mobile styles */
@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .primary-navigation {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: calc(100vh - 60px);
    background-color: var(--color-surface-mid);
    overflow-y: auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-xl);
    z-index: 999;
  }

  .primary-navigation[data-visible="true"] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-m);
  }

  .nav-list a {
    font-size: 1.125rem;
    padding: var(--space-s) 0;
  }
}

/* Desktop styles */
@media (min-width: 768px) {
  .site-header {
    height: 72px;
  }

  .logo-mark {
    width: 56px;
    height: 56px;
  }

  .logo-text {
    font-size: 1.25rem;
  }

  .nav-list {
    gap: var(--space-xl);
  }
}

/* Collision prevention for fixed header */
body {
  padding-top: 60px;
}

@media (min-width: 768px) {
  body {
    padding-top: 72px;
  }
}