.tb-site-header {
  position: fixed;
  z-index: 900;
  top: 0;
  right: 0;
  left: 0;
  height: 4.5rem;
  border-bottom: var(--border);
  background: var(--color-ink);
  color: var(--color-paper);
}

body {
  padding-top: 4.5rem;
}

.tb-site-header__inner {
  position: relative;
  display: grid;
  height: 100%;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
}

.tb-site-header__brand {
  display: inline-flex;
  min-width: 0;
  grid-column: 1;
  grid-row: 1;
  align-items: center;
  justify-self: start;
  gap: var(--space-2);
  color: var(--color-paper);
  font-family: var(--font-heading);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
}

.tb-site-header__logo {
  width: 2rem;
  height: 2rem;
  flex: 0 0 2rem;
  object-fit: contain;
}

.tb-site-header__nav {
  min-width: 0;
  grid-column: 2;
  grid-row: 1;
  justify-self: center;
}

.tb-site-header__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(.5rem, .8vw, .75rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.tb-site-header__list li,
.tb-site-header__list li + li {
  display: flex;
  margin: 0;
  padding: 0;
}

.tb-site-header__link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  border-bottom: 1px solid transparent;
  color: var(--color-muted);
  font-size: .8125rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.tb-site-header__link:hover,
.tb-site-header__link:focus-visible,
.tb-site-header__link[aria-current="page"] {
  border-color: var(--color-emerald);
  color: var(--color-paper);
}

.tb-site-header__actions {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.tb-site-header__cta {
  display: inline-flex;
  min-height: 2.5rem;
  align-items: center;
  justify-content: center;
  padding: .65rem .85rem;
  border: 1px solid var(--color-emerald);
  border-radius: var(--radius-sm);
  background: var(--color-emerald);
  color: var(--color-ink);
  font-size: .8125rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base);
}

.tb-site-header__cta:hover {
  border-color: var(--color-emerald-deep);
  background: var(--color-emerald-deep);
  color: var(--color-paper);
}

.tb-site-header__toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-paper);
}

.tb-site-header__toggle-lines,
.tb-site-header__toggle-lines::before,
.tb-site-header__toggle-lines::after {
  display: block;
  width: 1.25rem;
  height: 1.5px;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.tb-site-header__toggle-lines {
  position: relative;
}

.tb-site-header__toggle-lines::before,
.tb-site-header__toggle-lines::after {
  position: absolute;
  left: 0;
  content: "";
}

.tb-site-header__toggle-lines::before {
  top: -.38rem;
}

.tb-site-header__toggle-lines::after {
  top: .38rem;
}

.tb-site-header__toggle[aria-expanded="true"] .tb-site-header__toggle-lines {
  background: transparent;
}

.tb-site-header__toggle[aria-expanded="true"] .tb-site-header__toggle-lines::before {
  transform: translateY(.38rem) rotate(45deg);
}

.tb-site-header__toggle[aria-expanded="true"] .tb-site-header__toggle-lines::after {
  transform: translateY(-.38rem) rotate(-45deg);
}

.tb-site-header__toggle:focus-visible,
.tb-site-header__cta:focus-visible {
  outline: 2px solid var(--color-paper);
  outline-offset: 2px;
}

@media (max-width: 75rem) {
  .tb-site-header {
    height: 4.25rem;
  }

  body {
    padding-top: 4.25rem;
  }

  .tb-site-header__inner {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3);
  }

  .tb-site-header__brand {
    position: absolute;
    left: 50%;
    order: 2;
    transform: translateX(-50%);
  }

  .tb-site-header__logo {
    width: 1.75rem;
    height: 1.75rem;
    flex-basis: 1.75rem;
  }

  .tb-site-header__toggle {
    display: inline-flex;
    order: 1;
  }

  .tb-site-header__actions {
    order: 3;
    margin-left: auto;
  }

  .tb-site-header__cta {
    min-height: 2.5rem;
  }

  .tb-site-header__nav {
    position: fixed;
    z-index: 899;
    top: 4.25rem;
    right: 0;
    bottom: 0;
    left: 0;
    display: flex;
    visibility: hidden;
    min-height: 0;
    padding: var(--space-8) var(--container-padding);
    overflow-y: auto;
    background: var(--color-ink);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-.5rem);
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

  .tb-site-header__nav.is-open {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .tb-site-header__list {
    width: min(100%, var(--container-max));
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-inline: auto;
  }

  .tb-site-header__list li,
  .tb-site-header__list li + li {
    width: 100%;
    border-bottom: var(--border);
  }

  .tb-site-header__link {
    width: 100%;
    min-height: 3.25rem;
    justify-content: space-between;
    border-bottom: 0;
    font-size: var(--text-base);
  }

  .tb-site-header__link::after {
    color: var(--color-emerald);
    content: "↗";
  }

  .tb-site-header__link[aria-current="page"] {
    color: var(--color-emerald);
  }
}

@media (max-width: 30rem) {
  .tb-site-header__brand {
    font-size: .875rem;
  }

  .tb-site-header__brand span {
    display: none;
  }

  .tb-site-header__cta {
    padding-inline: .65rem;
    font-size: .75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tb-site-header__nav,
  .tb-site-header__toggle-lines,
  .tb-site-header__toggle-lines::before,
  .tb-site-header__toggle-lines::after {
    transition: none;
  }
}