.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 96%, var(--color-surface-warm));
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(100% - calc(var(--container-padding) * 2), var(--container));
  min-height: var(--header-height);
  margin-inline: auto;
  gap: var(--space-6);
}

.site-logo {
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-logo__text {
  color: var(--color-brand);
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}

.site-nav {
  position: static;
  visibility: visible;
  opacity: 1;
  transform: none;
}

.site-nav-mobile {
  display: none;
}

.site-nav__list {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  width: 100%;
  gap: var(--space-5);
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.site-nav__list--left {
  justify-content: flex-end;
}

.site-nav__list--right {
  justify-content: flex-start;
}

.site-nav__item {
  flex: 1;
  display: flex;
  justify-content: center;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding-inline: var(--space-4);
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 600;
  transition:
    color var(--transition-fast),
    transform var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-brand);
  transform: translateY(-2px);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 10%;
  bottom: -4px;
  width: 80%;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav-toggle {
  display: none;
}

@media (max-width: 70rem) {
  .site-header__inner {
    display: flex;
    flex-wrap: nowrap;
    justify-content: space-between;
    min-height: var(--header-height);
  }

  .site-logo__text {
    font-size: var(--text-2xl);
  }

  .site-nav-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
  }

  .site-nav-toggle__line {
    position: absolute;
    width: 18px;
    height: 2px;
    border-radius: var(--radius-pill);
    background: currentColor;
    transition:
      transform var(--transition-base),
      opacity var(--transition-fast);
  }

  .site-nav-toggle__line:nth-child(1) {
    transform: translateY(-6px);
  }

  .site-nav-toggle__line:nth-child(3) {
    transform: translateY(6px);
  }

  .site-header[data-state="open"] .site-nav-toggle__line:nth-child(1) {
    transform: rotate(45deg);
  }

  .site-header[data-state="open"] .site-nav-toggle__line:nth-child(2) {
    opacity: 0;
  }

  .site-header[data-state="open"] .site-nav-toggle__line:nth-child(3) {
    transform: rotate(-45deg);
  }

  .site-nav--desktop {
    display: none;
  }

  .site-nav-mobile {
    position: absolute;
    top: 100%;
    right: 0;
    width: min(22rem, calc(100vw - calc(var(--container-padding) * 2)));
    max-height: calc(100vh - var(--header-height) - var(--space-4));
    display: grid;
    grid-template-rows: 0fr;
    overflow: hidden;
    visibility: visible;
    opacity: 0;
    transition:
      grid-template-rows var(--transition-base),
      opacity var(--transition-fast);
  }

  .site-header[data-state="open"] .site-nav-mobile {
    grid-template-rows: 1fr;
    opacity: 1;
    overflow-y: auto;
  }

  .site-nav-mobile__list {
    display: grid;
    min-height: 0;
    gap: var(--space-2);
    margin-top: var(--space-2);
    padding: var(--space-2);
    border: 1px solid color-mix(in srgb, var(--color-border) 72%, var(--color-accent));
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
  }

  .site-nav-mobile .site-nav__link {
    justify-content: flex-start;
    width: 100%;
    min-height: 42px;
    padding-inline: var(--space-4);
    border-radius: var(--radius-sm);
  }

  .site-nav-mobile .site-nav__link:hover,
  .site-nav-mobile .site-nav__link[aria-current="page"] {
    color: var(--color-brand-dark);
    background: var(--color-accent-soft);
    transform: none;
  }

  .site-nav-mobile .site-nav__link::after {
    display: none;
  }
}

@media (max-width: 40rem) {
  .site-header__inner {
    width: min(100% - 1.5rem, var(--container));
  }

  .site-nav-mobile {
    width: 100%;
  }

  .site-logo__text {
    font-size: clamp(2rem, 11vw, 2.45rem);
  }
}

@media (max-width: 26rem) {
  .site-logo__text {
    font-size: clamp(1.75rem, 10vw, 2rem);
  }

  .site-nav-toggle {
    width: 38px;
    height: 38px;
  }
}