/* Header component styles */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--surface-primary);
  border-bottom: var(--border-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-3) var(--container-gutter);
  min-height: 72px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  text-decoration: none;
  color: var(--color-soft-stone);
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-list li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list li + li {
  margin: 0;
}

.site-header__nav-list a {
  display: inline-block;
  padding: var(--space-2) 0;
  font-size: var(--text-caption-size);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-soft-stone);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.site-header__nav-list a:hover,
.site-header__nav-list a:focus-visible {
  color: var(--color-raw-copper);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.site-header__cta {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-caption-size);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--color-raw-copper-20);
  border-radius: var(--radius-control);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__toggle:hover {
  border-color: var(--color-raw-copper);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}

.site-header__toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-soft-stone);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

.site-header__terminology {
  background-color: var(--surface-secondary);
  padding: var(--space-2) var(--container-gutter);
  overflow: hidden;
  white-space: nowrap;
  border-top: var(--border-subtle);
}

.site-header__terminology span {
  display: inline-block;
  font-size: var(--text-overline-size);
  letter-spacing: 0.2em;
  color: var(--color-grey-limestone);
  animation: terminology-scroll 30s linear infinite;
}

@keyframes terminology-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* Collision prevention for fixed header */
.site-header + * {
  margin-top: 0;
}

body {
  padding-top: 120px; /* header height + terminology strip */
}

/* Mobile navigation */
@media (max-width: 64rem) {
  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(80vw, 320px);
    background-color: var(--surface-primary);
    border-left: var(--border-subtle);
    box-shadow: var(--shadow-lift);
    transform: translateX(100%);
    transition: transform var(--transition-fast);
    z-index: 1001;
    padding: var(--space-6) var(--space-4);
    overflow-y: auto;
    display: block;
  }

  .site-header__nav.is-open {
    transform: translateX(0);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .site-header__nav-list a {
    display: block;
    padding: var(--space-3);
    font-size: var(--text-body-size);
    border-bottom: 1px solid var(--color-raw-copper-20);
  }

  .site-header__toggle {
    display: flex;
    z-index: 1002;
  }

  .site-header__cta {
    display: none;
  }

  body {
    padding-top: 72px; /* header height only, terminology hidden on mobile */
  }

  .site-header__terminology {
    display: none;
  }
}

@media (max-width: 48rem) {
  .site-header__logo {
    width: 40px;
    height: 40px;
  }

  .site-header__brand-text {
    font-size: 1rem;
  }

  .site-header__inner {
    min-height: 64px;
    padding: var(--space-2) var(--space-4);
  }

  body {
    padding-top: 64px;
  }
}