/* ========================================
   四川瑞泽科技 - 导航栏样式
   ======================================== */

/* ===== 导航栏容器 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 74px;
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: var(--box-shadow-sm);
  z-index: var(--z-index-fixed);
  transition: all var(--transition-base);
  border-bottom: 1px solid rgba(2, 136, 209, 0.08);
  backdrop-filter: blur(12px);
}

.navbar.glass {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--box-shadow-base);
}

.navbar.scrolled {
  box-shadow: var(--box-shadow-lg);
  background-color: rgba(255, 255, 255, 0.98);
}

/* ===== 导航栏内容 ===== */
.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--spacing-lg);
  max-width: var(--container-2xl);
  margin: 0 auto;
}

/* ===== Logo ===== */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--color-text-darkest);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  transition: color var(--transition-base);
  flex-shrink: 0;
}

.navbar-logo:hover {
  color: var(--color-primary);
}

.navbar-logo img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.navbar-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  max-width: 260px;
}

.navbar-logo-text .main {
  font-size: clamp(var(--font-size-sm), 1.9vw, var(--font-size-lg));
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.navbar-logo-text .sub {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  font-weight: var(--font-weight-normal);
}

/* ===== 导航菜单 ===== */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) 0;
  color: var(--color-primary-dark);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  border-bottom: 2px solid transparent;
}

.navbar-link:hover {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

.navbar-link.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ===== 下拉菜单箭头 ===== */
.navbar-link .dropdown-arrow {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform var(--transition-base);
  margin-left: var(--spacing-xs);
}

.navbar-item:hover .dropdown-arrow {
  transform: rotate(180deg);
}

/* ===== 二级下拉菜单 ===== */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--color-white);
  border-radius: var(--border-radius-base);
  box-shadow: var(--box-shadow-lg);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-index-dropdown);
  margin-top: var(--spacing-sm);
}

.navbar-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-menu a {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text-dark);
  text-decoration: none;
  transition: all var(--transition-base);
  border-left: 3px solid transparent;
}

.dropdown-menu a:first-child {
  border-radius: var(--border-radius-base) var(--border-radius-base) 0 0;
}

.dropdown-menu li:last-child a {
  border-radius: 0 0 var(--border-radius-base) var(--border-radius-base);
}

.dropdown-menu a:hover {
  background-color: var(--color-background-gray);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  padding-left: calc(var(--spacing-lg) + 4px);
}

/* ===== 右侧操作区 ===== */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar-actions .btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
}

/* ===== 汉堡菜单（移动端） ===== */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-md);
}

.navbar-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text-dark);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.navbar-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ===== 移动端响应 ===== */
@media (max-width: 768px) {
  .navbar-content {
    padding: 0 var(--spacing-md);
  }

  .navbar-logo-text {
    max-width: 180px;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
.navbar-menu {
  position: absolute;
  top: 74px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-white);
    border-bottom: var(--border-width-thin) solid var(--border-color-light);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }
  
  .navbar-menu.active {
    max-height: 500px;
  }
  
  .navbar-item {
    width: 100%;
    border-bottom: var(--border-width-thin) solid var(--border-color-light);
  }
  
  .navbar-link {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: none;
    width: 100%;
  }
  
  .navbar-link:hover {
    background-color: var(--color-background-gray);
    border-bottom: none;
    border-left: 3px solid var(--color-primary);
    padding-left: calc(var(--spacing-lg) - 3px);
  }
  
  .dropdown-menu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    box-shadow: none;
    border-radius: 0;
    background-color: var(--color-background-gray);
    margin-top: 0;
    transition: all var(--transition-base);
  }
  
  .navbar-item.active .dropdown-menu,
  .navbar-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
  }
  
  .dropdown-menu a {
    padding-left: var(--spacing-2xl);
    border-left: none;
  }
  
  .dropdown-menu a:hover {
    border-left: none;
    padding-left: var(--spacing-2xl);
    background-color: var(--color-light-gray);
  }
  
  .navbar-logo-text .main {
    font-size: var(--font-size-base);
  }
  
  .navbar-logo-text .sub {
    display: none;
  }
  
  .navbar-actions {
    gap: var(--spacing-sm);
  }
  
  .navbar-actions .btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 640px) {
  .navbar {
    height: 60px;
  }
  
  .navbar-content {
    padding: 0 var(--spacing-md);
  }
  
  .navbar-logo img {
    height: 40px;
  }
  
  .navbar-menu.active {
    max-height: 400px;
  }
  
  .navbar-actions {
    display: none;
  }
}

/* ===== 页面顶部间距（为固定导航栏预留空间） ===== */
body {
  padding-top: 74px;
}

@media (max-width: 640px) {
  body {
    padding-top: 64px;
  }
}

/* ===== 导航栏下的返回顶部按钮 ===== */
.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-index-sticky);
  box-shadow: var(--box-shadow-lg);
  font-size: var(--font-size-xl);
  text-decoration: none;
}

.scroll-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-xl);
}

@media (max-width: 640px) {
  .scroll-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: var(--font-size-lg);
  }
}