.logo {
  font-size: 20px;
}
.logo a {
  color: #FFFFFF;
}
#header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(1, 3, 20, 0);
  /* 半透明背景 */
  transition: background-color 0.3s ease;
  z-index: 1000;
}
#header.scrolled {
  background-color: #042b50;
  /* 滚动后背景变实色 */
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  max-width: 1200px;
  margin: 0 auto;
  color: #fff;
  height: 80px;
}
.menu-toggle {
  display: none;
  font-size: 24px;
  cursor: pointer;
}
.nav-menu {
  display: flex;
  list-style: none;
  gap: 20px;
  margin-bottom: 0;
}
.nav-item {
  position: relative;
}
.nav-link {
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
}
.nav-link .arrow {
  font-size: 12px;
  margin-left: 5px;
}
/* ▼ 二级菜单样式与动画 */
.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  background: #fff;
  color: #333;
  border-radius: 6px;
  padding: 0;
  min-width: 160px;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  opacity: 0;
  max-height: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}
.submenu a {
  display: block;
  padding: 10px 20px;
  text-decoration: none;
  color: #333;
  font-size: 16px;
  transition: background 0.2s;
  min-width: 200px;
}
.submenu a:hover {
  color: #ffffff;
  background: #ffffff;
}
.nav-item a:hover {
  color: #ffffff;
}
/* PC端：悬停时显示 submenu */
@media (min-width: 768px) {
  .nav-item:hover .submenu {
    opacity: 1;
    max-height: 500px;
    pointer-events: auto;
  }
}
/* ========== 移动端样式 ========== */
@media (max-width: 767px) {
  .menu-toggle {
    display: block;
    color: #fff;
  }
  .nav-menu {
    flex-direction: column;
    display: block;
    max-height: 0;
    overflow: hidden;
    background-color: #073968;
    width: 100%;
    opacity: 0;
    transition: all 0.3s ease;
  }
  .nav-menu.active {
    max-height: 1000px;
    opacity: 1;
  }
  .nav-link {
    padding: 12px 20px;
  }
  .submenu {
    position: static;
    background: #26476b;
    padding: 0;
  }
  .submenu a {
    color: #fff;
  }
  .nav-item.open .submenu {
    opacity: 1;
    max-height: 500px;
    pointer-events: auto;
  }
  #navMenu {
    position: absolute;
    top: 80px;
    left: 0;
  }
}
/*# sourceMappingURL=nav.css.map */