.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: var(--border-default);
  background: color-mix(in srgb, var(--color-paper-bright) 96%, transparent);
  backdrop-filter: blur(8px);
}

.site-header__progress {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: transparent;
}

.site-header__progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-editorial-red);
}

.site-header__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  min-height: 4.75rem;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  grid-column: 2;
  align-items: center;
  justify-self: center;
  gap: 0.625rem;
  min-width: 0;
  color: var(--color-charcoal);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand img {
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 2.75rem;
  object-fit: contain;
}

.site-header__nav {
  min-width: 0;
}

.site-header__nav--left {
  grid-column: 1;
  justify-self: start;
}

.site-header__nav--right {
  grid-column: 3;
  justify-self: end;
}

.site-header__nav ul,
.site-header__mobile-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 1.25vw, 1.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav li,
.site-header__mobile-nav li,
.site-header__nav li + li,
.site-header__mobile-nav li + li {
  margin: 0;
  padding: 0;
}

.site-header__nav a {
  display: block;
  padding-block: 0.35rem;
  border-bottom: 1px solid transparent;
  color: var(--color-charcoal);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__nav a:hover,
.site-header__nav a[aria-current="page"] {
  border-bottom-color: var(--color-editorial-red);
  color: var(--color-editorial-red);
}

.site-header__toggle,
.site-header__mobile-nav {
  display: none;
}

@media (max-width: 900px) {
  .site-header__inner {
    grid-template-columns: 2.75rem minmax(0, 1fr) 2.75rem;
    min-height: 4.25rem;
  }

  .site-header__brand {
    grid-column: 2;
    font-size: 1rem;
  }

  .site-header__brand img {
    width: 2.25rem;
    height: 2.25rem;
    flex-basis: 2.25rem;
  }

  .site-header__nav {
    display: none;
  }

  .site-header__toggle {
    display: inline-flex;
    grid-column: 1;
    align-items: center;
    justify-content: center;
    justify-self: start;
    width: 2.75rem;
    min-height: 2.75rem;
    padding: 0;
    border: var(--border-default);
    background: var(--color-paper-bright);
    color: var(--color-charcoal);
  }

  .site-header__toggle:hover {
    border-color: var(--color-editorial-red);
    background: var(--color-paper-bright);
    color: var(--color-editorial-red);
  }

  .site-header__toggle-line {
    position: absolute;
    width: 1.125rem;
    height: 1px;
    background: currentColor;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .site-header__toggle-line:nth-child(1) { transform: translateY(-0.35rem); }
  .site-header__toggle-line:nth-child(3) { transform: translateY(0.35rem); }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: 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: rotate(-45deg); }

  .site-header__mobile-nav {
    position: absolute;
    z-index: 1;
    top: calc(100% + 1px);
    right: var(--container-padding);
    left: var(--container-padding);
    max-height: calc(100vh - 4.25rem);
    overflow-y: auto;
    border: var(--border-default);
    background: var(--color-paper-bright);
    box-shadow: var(--shadow-floating);
  }

  .site-header__mobile-nav:not([hidden]) {
    display: block;
  }

  .site-header__mobile-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header__mobile-nav li + li {
    border-top: var(--border-default);
  }

  .site-header__mobile-nav a {
    display: block;
    padding: 0.9rem var(--space-4);
    color: var(--color-charcoal);
    font-size: var(--text-small);
    font-weight: 600;
    line-height: 1.3;
    text-decoration: none;
  }

  .site-header__mobile-nav a:hover,
  .site-header__mobile-nav a[aria-current="page"] {
    background: var(--color-note);
    color: var(--color-editorial-red);
  }

  body.site-header-menu-open {
    overflow: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__toggle-line {
    transition: none;
  }
}