header.navbar {
  background: var(--color-surface);
  box-shadow: var(--shadow);
  padding: 0.5rem 1rem;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.navbar-brand {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-primary);
  display: flex;
  align-items: center;
}

.navbar-brand img {
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.navbar-nav .nav-item {
  margin-right: 0.8rem;
}

.navbar-nav .nav-link {
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  transition: var(--transition);
  font-weight: 500;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  background: var(--color-hover);
  color: var(--color-primary);
}

.btn-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
}

.search-form {
  flex: 1;
  margin: 0 1rem;
  display: flex;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: var(--transition);
}

.search-form:focus-within {
  box-shadow: 0 0 0 2px var(--color-primary-light);
  border-color: var(--color-primary);
}

.search-form input {
  flex: 1;
  padding: 0.4rem 1rem;
  color: var(--color-text);
}

.search-form button {
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.search-form button:hover {
  background: var(--color-hover);
}

header > div:last-child button {
  background: var(--color-primary);
  color: white;
  padding: 0.4rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}

header > div:last-child button:hover {
  background: #3a7bd5;
}

header > div:last-child span {
  font-weight: 500;
  color: var(--color-primary);
}

.navbar-nav .nav-link.btn, .navbar-nav .nav-link.btn-link {
  background: none;
  border: none;
  padding: 0.5rem 0.8rem;
  color: var(--color-text);
  font-weight: 500;
  cursor: pointer;
}

.navbar-nav .nav-link.btn:hover, .navbar-nav .nav-link.btn.active, .navbar-nav .nav-link.btn-link:hover, .navbar-nav .nav-link.btn-link.active {
  background: var(--color-hover);
  color: var(--color-primary);
}

.navbar-nav .nav-link.btn-link:disabled {
  cursor: not-allowed;
  color: var(--color-text-muted, #aaa);
  opacity: 0.6;
}

.navbar-nav .nav-link.btn-link:disabled i {
  color: inherit;
}

@media (max-width: 991px) {
  .search-form {
    max-width: 100%;
    margin: 0.5rem 0;
  }

  .navbar-nav .nav-item {
    margin-right: 0;
    margin-bottom: 0.5rem;
  }
}