/* 
 * 固定导航栏样式 - 包含二级下拉菜单
 */

@import url('variables.css');

/* ===== 导航栏容器 ===== */
nav.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

nav.navbar.scrolled {
  box-shadow: var(--shadow-lg);
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
}

/* ===== 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-max-width);
  margin: 0 auto;
}

/* ===== Logo ===== */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  transition: color var(--transition-fast);
  margin-left: calc(var(--spacing-md) * -0.5);
}

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

.navbar-logo img {
  height: 50px;
  width: auto;
}

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

.navbar-logo-text .company-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  white-space: nowrap;
}

.navbar-logo-text .company-slogan {
  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-text);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  white-space: nowrap;
}

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

.navbar-link.active {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: calc(var(--spacing-md) - 2px);
}

/* 下拉菜单指示器 */
.navbar-link .dropdown-indicator {
  font-size: 0.7em;
  transition: transform var(--transition-fast);
}

.navbar-item:hover .dropdown-indicator {
  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(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
  margin-top: var(--spacing-md);
  list-style: none;
  overflow: hidden;
}

.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);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.dropdown-menu a:hover {
  background-color: var(--color-light-gray);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  padding-left: calc(var(--spacing-lg) + 3px);
}

.dropdown-menu a.active {
  background-color: var(--color-light-gray);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* ===== 导航栏右侧操作 ===== */
.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（移动设备） ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

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

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

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

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  nav.navbar {
    height: 60px;
  }
  
  .navbar-content {
    padding: 0 var(--spacing-md);
  }
  
  .navbar-logo {
    gap: var(--spacing-sm);
    font-size: var(--font-size-base);
    margin-left: 0;
  }
  
  .navbar-logo img {
    height: 40px;
  }
  
  .navbar-logo-text .company-name {
    font-size: var(--font-size-xs);
    white-space: normal;
  }
  
  .navbar-logo-text .company-slogan {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  .navbar-menu {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-white);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    box-shadow: var(--shadow-md);
    border-radius: 0;
  }
  
  .navbar-menu.active {
    max-height: 500px;
  }
  
  .navbar-item {
    width: 100%;
    border-bottom: 1px solid var(--color-gray);
  }
  
  .navbar-link {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: none;
  }
  
  .navbar-link.active {
    border-bottom: none;
    background-color: var(--color-light-gray);
  }
  
  .dropdown-menu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    box-shadow: none;
    background-color: var(--color-light-gray);
    margin-top: 0;
    border-radius: 0;
    transition: max-height var(--transition-base);
  }
  
  .navbar-item.active .dropdown-menu,
  .navbar-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    max-height: 300px;
  }
  
  .dropdown-menu a {
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-md) calc(var(--spacing-lg) + var(--spacing-lg));
    border-left: none;
  }
  
  .dropdown-menu a:hover {
    padding-left: calc(var(--spacing-lg) + var(--spacing-lg));
    border-left: none;
  }
  
  .navbar-actions {
    gap: var(--spacing-sm);
  }
  
  .navbar-actions .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  .navbar-content {
    padding: 0 var(--spacing-md);
  }
  
  .navbar-menu {
    gap: 0;
  }
  
  .navbar-actions .btn {
    display: none;
  }
}