/* ==========================================
   导航栏样式 - 固定导航栏 + 二级下拉菜单
   使用统一的CSS变量，确保与style.css兼容
   ========================================== */

/* 导航栏基本样式已在style.css中定义，这里只做增强和响应式处理 */

/* 导航链接下划线效果增强 */
.navbar-link {
  position: relative;
  transition: all 0.3s ease;
}

.navbar-link::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-primary-light) 100%);
  transition: width 0.3s ease;
}

.navbar-link:hover::before,
.navbar-item.active .navbar-link::before {
  width: 80%;
}

/* 下拉箭头指示器 */
.navbar-link.has-dropdown {
  padding-right: 28px;
}

.navbar-link.has-dropdown::after {
  content: '▼';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  transition: transform 0.3s ease;
  opacity: 0.7;
}

.navbar-item:hover .navbar-link.has-dropdown::after {
  transform: translateY(-50%) rotate(180deg);
}

/* 下拉菜单动画优化 */
.dropdown-menu {
  margin-top: 8px;
  animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 移动端下拉菜单点击展开 */
@media (max-width: 768px) {
  .navbar-toggle {
    cursor: pointer;
    z-index: 1001;
  }

  .navbar-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
    transition: all 0.3s ease;
  }

  .navbar-toggle span:nth-child(2) {
    margin: 6px 0;
  }

  .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(8px, -8px);
  }

  .navbar-menu {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #1E2830 100%);
  }

  .navbar-item {
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .navbar-link {
    color: white;
  }

  .navbar-link::before {
    display: none;
  }

  .navbar-link.has-dropdown::after {
    right: 20px;
    color: var(--color-accent);
  }

  .dropdown-menu {
    background: rgba(0,0,0,0.3);
    padding: 0;
    margin-top: 0;
    animation: none;
  }

  .dropdown-link {
    color: rgba(255,255,255,0.9);
    padding-left: 48px;
    font-size: 15px;
  }

  .dropdown-link:hover {
    background: rgba(255,255,255,0.1);
    color: var(--color-accent);
  }
}

/* 平板设备优化 */
@media (max-width: 1024px) and (min-width: 769px) {
  .navbar-menu {
    gap: 4px;
  }

  .navbar-link {
    padding: 10px 16px;
    font-size: 15px;
  }

  .dropdown-menu {
    min-width: 170px;
  }
}