/* ==========================================================================
   Header Component Styles
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-borderSubtle);
  height: 80px;
  display: flex;
  align-items: center;
}

/* Collision prevention: push page content below fixed header */
body {
  padding-top: 80px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding-x);
}

/* Logo and brand text */
.header-logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  text-decoration: none;
  color: var(--color-textPrimary);
  flex-shrink: 0;
}

.header-logo-link:hover {
  text-decoration: none;
}

.header-logo-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  display: block;
}

.header-brand-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: var(--letter-spacing-heading);
  line-height: 1.2;
  white-space: nowrap;
}

/* Navigation toggle (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

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

.nav-toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-textPrimary);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Open state for toggle */
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: var(--spacing-8) 0;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-textPrimary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Mobile navigation */
@media (max-width: 1024px) {
  .nav-toggle {
    display: flex;
  }

  .primary-navigation {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-background);
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-32) var(--container-padding-x);
    overflow-y: auto;
    z-index: 999;
    display: none;
  }

  .primary-navigation[aria-hidden="false"] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-16);
  }

  .nav-link {
    font-size: 1.125rem;
    padding: var(--spacing-12) 0;
  }

  .header-brand-text {
    font-size: 1.25rem;
  }

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

/* Desktop: ensure navigation is visible */
@media (min-width: 1025px) {
  .primary-navigation {
    display: flex;
  }

  .primary-navigation[aria-hidden] {
    display: flex;
  }
}