/* 导航组件样式 */

.main-navigation {
  width: 100%;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: var(--container-xlarge);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.75rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-brand-icon {
  width: 2rem;
  height: 2rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-dark);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-normal);
  font-weight: 500;
  min-height: var(--min-touch-target);
}

.nav-link:hover {
  background-color: var(--bg-light);
  color: var(--primary-color);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: background-color var(--transition-normal);
  min-width: var(--min-touch-target);
  min-height: var(--min-touch-target);
}

.nav-toggle:hover {
  background-color: var(--bg-light);
}

.hamburger {
  width: 1.5rem;
  height: 1.125rem;
  position: relative;
  transform: rotate(0deg);
  transition: var(--transition-normal);
}

.hamburger span {
  display: block;
  position: absolute;
  height: 0.1875rem;
  width: 100%;
  background: var(--text-dark);
  border-radius: 0.1875rem;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: var(--transition-normal);
}

.hamburger span:nth-child(1) { top: 0px; }
.hamburger span:nth-child(2) { top: 0.4375rem; }
.hamburger span:nth-child(3) { top: 0.875rem; }

.hamburger.open span:nth-child(1) {
  top: 0.4375rem;
  transform: rotate(135deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
  left: -3.75rem;
}

.hamburger.open span:nth-child(3) {
  top: 0.4375rem;
  transform: rotate(-135deg);
}

.nav-menu-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-medium);
  padding: var(--spacing-md);
}

.nav-menu-mobile.show {
  display: block;
}

.nav-menu-mobile .nav-menu {
  flex-direction: column;
  align-items: stretch;
  gap: var(--spacing-xs);
}

.nav-menu-mobile .nav-link {
  justify-content: flex-start;
  padding: var(--spacing-md);
}

.bottom-navigation {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--bg-white);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-sm) 0;
  z-index: 100;
  display: none;
}

.bottom-nav-container {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: var(--spacing-xs);
  color: var(--text-medium);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-normal);
  min-width: 3.75rem;
  min-height: var(--min-touch-target);
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.bottom-nav-item:hover {
  color: var(--primary-color);
  background-color: var(--bg-light);
}

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

.bottom-nav-icon {
  width: 1.5rem;
  height: 1.5rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  font-size: var(--font-size-sm);
  color: var(--text-medium);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.breadcrumb-link {
  color: var(--text-medium);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-normal);
}

.breadcrumb-link:hover {
  color: var(--primary-color);
  background-color: var(--bg-light);
}

.breadcrumb-separator {
  color: var(--text-light);
  font-size: var(--font-size-xs);
}

.breadcrumb-current {
  color: var(--text-dark);
  font-weight: 500;
}

/* 响应式调整 */
@media (max-width: 29.9375rem) {
  .nav-container {
    padding: 0 var(--spacing-sm);
    min-height: 3.5rem;
  }
  
  .nav-brand {
    font-size: var(--font-size-base);
  }
  
  .nav-brand-icon {
    width: 1.75rem;
    height: 1.75rem;
  }
  
  .nav-menu {
    display: none;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .bottom-navigation {
    display: block;
  }
  
  body {
    padding-bottom: 4.375rem;
  }
  
  .bottom-nav-item {
    font-size: 0.6875rem;
    min-width: 3.125rem;
  }
  
  .bottom-nav-icon {
    width: 1.25rem;
    height: 1.25rem;
  }
}

@media (min-width: 30rem) and (max-width: 47.9375rem) {
  .nav-menu {
    display: none;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .bottom-navigation {
    display: block;
  }
  
  body {
    padding-bottom: 4.375rem;
  }
}

@media (min-width: 48rem) {
  .nav-menu {
    display: flex;
  }
  
  .nav-toggle {
    display: none;
  }
  
  .bottom-navigation {
    display: none;
  }
  
  body {
    padding-bottom: 0;
  }
  
  .nav-container {
    padding: 0 var(--spacing-lg);
  }
  
  .nav-link {
    font-size: var(--font-size-sm);
  }
}

@media (min-width: 64rem) {
  .nav-container {
    padding: 0 var(--spacing-xl);
  }
  
  .nav-link {
    font-size: var(--font-size-base);
  }
}