.site-header {
  position: fixed;
  inset: 1rem 1rem auto;
  z-index: 1000;
  padding: 0.75rem 1rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 2rem);
  color: var(--color-text);
  background: var(--color-header);
  backdrop-filter: blur(1.25rem);
  -webkit-backdrop-filter: blur(1.25rem);
  border: 1px solid var(--color-header-border);
  border-radius: var(--radius-pill);
  box-shadow: 0 1.125rem 3.125rem var(--color-shadow);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  box-shadow: 0 0.75rem 2rem var(--color-shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
  font-weight: 800;
  line-height: 1.05;
}

.brand-logo {
  width: 3.2rem;
  height: 3.2rem;
  object-fit: contain;
}

.main-nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: clamp(0.7rem, 1.35vw, 1.65rem);
}

.main-nav a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.35em;
  font-size: clamp(0.78rem, 0.78vw, 0.9rem);
  font-weight: 700;
  white-space: nowrap;
  transition: text-decoration-color var(--transition-fast);
}

.main-nav a:hover,
.main-nav a:focus-visible,
.main-nav a[aria-current="page"] {
  text-decoration-color: currentColor;
}

.main-nav a[aria-current="page"] {
  text-decoration-thickness: 0.14em;
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-tools button,
.menu-toggle {
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: transparent;
  color: inherit;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  font-size: 0.88rem;
}

.nav-tools button:hover:not(:disabled),
.menu-toggle:hover {
  background: color-mix(in srgb, var(--color-text) 10%, transparent);
}

.nav-tools button[aria-pressed="true"] {
  border-color: currentColor;
  background: color-mix(in srgb, var(--color-text) 12%, transparent);
}

.nav-tools button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.nav-tools .listen-button {
  padding-inline: 1rem;
  border-color: currentColor;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
}

.menu-toggle__icon,
.menu-toggle__icon::before,
.menu-toggle__icon::after {
  width: 1.35rem;
  height: 0.125rem;
  display: block;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle__icon {
  position: relative;
}

.menu-toggle__icon::before,
.menu-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-toggle__icon::before { top: -0.4rem; }
.menu-toggle__icon::after { top: 0.4rem; }

.menu-toggle[aria-expanded="true"] .menu-toggle__icon {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 75rem) {
  .site-header {
    grid-template-columns: auto auto;
    justify-content: space-between;
    border-radius: 1.75rem;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .main-nav,
  .nav-tools {
    grid-column: 1 / -1;
    width: 100%;
  }

  .main-nav {
    display: none;
    justify-self: stretch;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-header-border);
  }

  .main-nav a {
    padding: 0.7rem 0.25rem;
    font-size: 1rem;
  }

  .nav-tools {
    display: none;
    flex-wrap: wrap;
    padding-top: 0.5rem;
  }

  .site-header.menu-is-open .main-nav,
  .site-header.menu-is-open .nav-tools {
    display: flex;
  }
}

@media (max-width: 30rem) {
  .site-header {
    inset: 0.5rem 0.5rem auto;
  }

  .brand-logo {
    width: 2.75rem;
    height: 2.75rem;
  }

  .brand span {
    font-size: 0.9rem;
  }
}