/* === 统一顶部导航栏 === */

.nav {
  position: sticky;
  top: 0;
  background: rgba(251, 246, 233, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-primary-dark);
  text-decoration: none;
}

.nav-logo img,
.nav-logo-img {
  height: 32px;
  width: 32px;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.nav-logo:hover .nav-logo-img {
  transform: scale(1.08);
}

.nav-logo-text {
  color: var(--color-primary-dark);
}

.nav-links {
  display: flex;
  gap: var(--space-xs);
  align-items: center;
}

.nav-links a {
  padding: 8px 16px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-primary-dark);
  background: var(--color-surface);
}

.nav-links a.active {
  color: var(--color-primary-dark);
  background: var(--color-surface);
}

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === 响应式 === */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-sm);
    gap: var(--space-xs);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 16px;
  }
}