.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.nav-brand:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav-link.active {
  color: var(--color-primary);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
}

.theme-toggle-icon::before {
  content: '';
  display: block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-text-muted);
  transition: clip-path 0.3s;
}

[data-theme="dark"] .theme-toggle-icon::before {
  clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
  border-radius: 50%;
  background: transparent;
  box-shadow: inset -6px -2px 0 0 var(--color-text-muted);
}

[data-theme="light"] .theme-toggle-icon::before,
:root:not([data-theme]) .theme-toggle-icon::before {
  clip-path: circle(50% at 50% 50%);
}