lang-quiz/client/src/App.css

.app-shell {
  min-height: 100vh;
}

.topbar {
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: 1.1rem;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 0.5rem;
}

.link {
  padding: 0.55rem 0.85rem;
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  font-weight: 600;
}

.nav-link-btn {
  border: none;
  background: transparent;
  padding: 0.55rem 0.85rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
}

.link.active {
  background: rgba(0, 0, 0, 0.06);
  color: var(--accent);
}

.main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}