.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: var(--header-footer);
  padding: 0.75rem 1rem;
  box-shadow: 0 0 5px var(--acc2a);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-links {
  display: flex;
  gap: 0.75rem;
}

.header-nav a,
.header-nav button {
  color: var(--accent1);
  text-decoration: none;
  font-weight: bold;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: background-color 0.3s ease;
  font-size: 0.9rem;
  background: none;
  border: none;
  cursor: pointer;
}

.header-nav a:hover,
.header-nav a.active,
.header-nav button:hover {
  background-color: var(--accent2);
  color: var(--secondary);
}