html {
  scrollbar-gutter: stable;
  overflow-y: scroll;
}

body {
  font-family: var(--font-body);
}

input,
textarea,
select,
button {
  font-family: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 1.5rem;
  height: 68px;
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 60%, transparent);
  font-family: var(--font-heading);
}

.logo {
  grid-column: 1;
  justify-self: start;
  font-weight: 700;
  letter-spacing: 0.14em;
  font-size: 0.9rem;
  text-transform: uppercase;
  color: var(--color-text);
}

.logo span {
  color: var(--color-primary);
  margin-left: 0.25rem;
  letter-spacing: 0.11em;
  font-weight: 600;
}

.main-nav {
  grid-column: 2;
  justify-self: center;
  display: flex;
  gap: 0.8rem;
  font-size: 0.86rem;
}

.main-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.main-nav a:hover {
  background: color-mix(in srgb, var(--color-primary) 16%, transparent);
  color: var(--color-text);
  text-decoration: none;
}

.nav-toggle {
  grid-column: 3;
  justify-self: end;
  display: none;
  background: none;
  border: 1px solid color-mix(in srgb, var(--color-border) 70%, transparent);
  color: var(--color-text);
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  font-size: 1.2rem;
}

.theme-toggle {
  grid-column: 3;
  justify-self: end;
  margin-left: 0.6rem;
  border: 1px solid color-mix(in srgb, var(--color-border) 70%, transparent);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  color: var(--color-text);
  border-radius: 999px;
  padding: 0.34rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
}

@media (max-width: 768px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .logo {
    grid-column: 1;
  }

  .main-nav {
    grid-column: 1 / -1;
    position: fixed;
    inset: 68px 1rem auto 1rem;
    background: color-mix(in srgb, var(--color-surface) 98%, transparent);
    border-radius: 18px;
    border: 1px solid color-mix(in srgb, var(--color-border) 70%, transparent);
    box-shadow: 0 20px 50px color-mix(in srgb, var(--color-text) 16%, transparent);
    padding: 0.9rem 1rem;
    flex-direction: column;
    gap: 0.5rem;
    transform: translateY(-140%);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.24s ease-out, transform 0.24s ease-out;
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle {
    grid-column: 2;
    grid-row: 1;
    display: block;
  }

  .theme-toggle {
    grid-column: 2;
    grid-row: 1;
    margin-right: 3.1rem;
  }
}