.navbar {
  width: 100%;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  padding: 0.75rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-left {
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-dark);
}

.nav-center,
.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-center a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--nav-link-color);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  min-height: 2.5rem;
  padding: 0.42rem 0.78rem;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}

.nav-right {
  justify-self: end;
}

.nav-center a:hover {
  background: var(--nav-link-hover-bg);
  color: var(--nav-link-hover-text);
}

.theme-toggle {
  appearance: none;
  border: 1px solid var(--theme-btn-border);
  background: var(--theme-btn-bg);
  color: var(--theme-btn-text);
  font-family: inherit;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1;
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

.theme-toggle:hover {
  background: var(--theme-btn-hover-bg);
  color: var(--theme-btn-hover-text);
  border-color: var(--theme-btn-hover-bg);
  transform: translateY(-1px);
}

.theme-toggle:active {
  transform: translateY(0);
}

.theme-toggle:focus {
  outline: none;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--nav-border);
  padding: 0.75rem 1.25rem;
  text-align: center;
  color: var(--text-dark);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .navbar {
    grid-template-columns: 1fr;
    justify-content: center;
    padding: 0.5rem 0.5rem;
    text-align: center;
    gap: 0.4rem;
  }

  .nav-center,
  .nav-right {
    gap: 0.5rem;
    justify-self: center;
  }

  .nav-center a {
    font-size: 0.9rem;
    min-height: 2.3rem;
    padding: 0.35rem 0.65rem;
  }

  .theme-toggle {
    width: 2.3rem;
    height: 2.3rem;
    font-size: 1rem;
  }
}