/**
 * 全站导航栏统一优化：层级、不透底的下拉、间距、焦点态
 * 需在页面内联 <style> 之后引入以覆盖旧规则
 */

html {
  scroll-behavior: smooth;
}

/* 锚点跳转时避开 sticky 导航栏 */
section[id] {
  scroll-margin-top: 92px;
}

@media (min-width: 769px) {
  .navbar {
    z-index: 10050;
    isolation: isolate;
    box-shadow:
      0 1px 0 rgba(0, 0, 0, 0.06),
      0 8px 24px rgba(0, 0, 0, 0.06);
  }

  .nav-container {
    min-height: 56px;
  }

  .nav-menu {
    align-items: stretch;
    gap: 0.25rem;
  }

  .nav-menu > li > a {
    padding: 0.65rem 1rem !important;
    min-height: 44px;
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition:
      color 0.2s ease,
      background-color 0.2s ease,
      box-shadow 0.2s ease;
  }

  .nav-menu > li > a:hover {
    background-color: rgba(0, 102, 204, 0.06);
  }

  .nav-menu > li > a.active {
    background-color: rgba(0, 102, 204, 0.08);
    font-weight: 600;
  }

  /* 下拉：禁止对整块做 opacity 动画，避免半透明时透出下方正文 */
  .nav-menu > li > ul {
    opacity: 1 !important;
    background-color: #ffffff !important;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 10px;
    box-shadow:
      0 16px 40px rgba(0, 0, 0, 0.12),
      0 2px 8px rgba(0, 0, 0, 0.06);
    padding: 8px 0 !important;
    min-width: 200px;
    z-index: 10100 !important;
    top: calc(100% - 2px);
    left: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition:
      transform 0.2s ease,
      visibility 0.2s,
      box-shadow 0.2s ease;
    pointer-events: none;
  }

  .nav-menu > li:hover > ul:not(.nav-dropdown-sibling-hide),
  .nav-menu > li:focus-within > ul:not(.nav-dropdown-sibling-hide) {
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-menu > li > ul li a {
    padding: 10px 18px !important;
    text-align: left !important;
    margin: 0 6px;
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.4;
    transition:
      background-color 0.15s ease,
      color 0.15s ease,
      transform 0.15s ease;
  }

  .nav-menu > li > ul li a:hover {
    padding-left: 18px !important;
    transform: translateX(2px);
  }

  .nav-menu > li > ul li a:focus-visible {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
  }
}