/* Header component styles */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(7, 16, 31, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-platinum-20);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  padding-block: var(--space-2);
}

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

.site-header__brand:hover {
  color: var(--color-ice);
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-platinum-20);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__toggle:hover {
  border-color: var(--color-platinum);
  background-color: var(--color-platinum-10);
}

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

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-platinum);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.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__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-close {
  display: none;
}

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

.site-header__nav-item {
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  display: inline-block;
  padding: var(--space-1) 0;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ivory);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
  position: relative;
}

.site-header__nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background-color: var(--color-platinum);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.site-header__nav-link:hover {
  color: var(--color-ice);
}

.site-header__nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-header__nav-link:focus-visible {
  outline: 2px solid var(--color-platinum);
  outline-offset: 4px;
  border-radius: 2px;
}

@media (max-width: 1023px) {
  /* `backdrop-filter` creates a containing block for fixed descendants on mobile.
     Remove it while the drawer is active so the navigation is sized to the viewport. */
  .site-header {
    z-index: 4000;
    background-color: rgba(7, 16, 31, 0.98);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: auto;
    width: min(320px, 85vw);
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-graphite);
    border-left: 1px solid var(--color-platinum-20);
    box-shadow: var(--shadow-elevated);
    padding: var(--space-6) var(--space-4);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    z-index: 1;
    display: block;
  }

  .site-header__nav-close {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-ice);
    border: 1px solid var(--color-platinum-20);
    border-radius: 50%;
    font-size: 2rem;
    line-height: 1;
    transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
  }

  .site-header__nav-close:hover {
    color: var(--color-ink);
    background-color: var(--color-platinum);
    border-color: var(--color-platinum);
  }

  .site-header__nav-close:focus-visible {
    outline: 2px solid var(--color-ice);
    outline-offset: 3px;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
    padding-block-start: calc(44px + var(--space-5));
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-2) var(--space-3);
    font-size: 1rem;
    letter-spacing: 0.06em;
    border-radius: var(--radius-sm);
  }

  .site-header__nav-link:hover {
    background-color: var(--color-platinum-10);
  }

  .site-header__nav-link::after {
    display: none;
  }
}

@media (max-width: 767px) {
  .site-header__inner {
    min-height: 64px;
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

  .site-header__brand-text {
    display: none;
  }
}