/**
 * Shared header nav: hierarchical menu + dropdown (front-end).
 * Mobile overlay applies to .site-header only; product detail in-page nav uses product.css.
 */
.site-header .header-inner {
  position: relative;
}

.site-header .header-cta {
  padding: 0 6px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-weight: 600;
  color: #1f2a49;
}

.main-nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px;
}

.main-nav-menu > li {
  position: relative;
}

.main-nav-menu a {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}

.main-nav-menu > li > a {
  padding: 8px 0;
}

/* 顶级：有子菜单 — 下拉箭头 + 悬停时主题色下划线 */
.main-nav-menu > .menu-item-has-children > a {
  gap: 0.25em;
  box-shadow: 0 2px 0 0 transparent;
  transition: color 0.2s ease, box-shadow 0.2s ease;
}

.main-nav-menu > .menu-item-has-children > a::after {
  content: "";
  flex-shrink: 0;
  display: inline-block;
  margin-left: 0.35em;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.55;
  transition: opacity 0.2s ease, border-top-color 0.2s ease;
}

.main-nav-menu > .menu-item-has-children:hover > a::after,
.main-nav-menu > .menu-item-has-children:focus-within > a::after {
  opacity: 1;
  border-top-color: var(--primary, #1f2a49);
}

.main-nav-menu > .menu-item-has-children:hover > a,
.main-nav-menu > .menu-item-has-children:focus-within > a {
  box-shadow: 0 2px 0 0 var(--primary, #1f2a49);
}

/* 下拉内仍有子级时：右侧小箭头 */
.main-nav-menu .sub-menu .menu-item-has-children > a {
  padding-right: 1.75em;
  position: relative;
}

.main-nav-menu .sub-menu .menu-item-has-children > a::after {
  content: "";
  position: absolute;
  right: 0.65em;
  top: 50%;
  margin-top: -0.25em;
  border: solid currentColor;
  border-width: 0 2px 2px 0;
  display: inline-block;
  padding: 0.2em;
  transform: rotate(-45deg);
  opacity: 0.5;
}

.main-nav-menu .sub-menu {
  list-style: none;
  margin: 0;
  padding: 10px 0;
  position: absolute;
  left: 0;
  top: 100%;
  min-width: 220px;
  background: #fff;
  border: 1px solid var(--line, #f4f0e9);
  border-radius: 14px;
  box-shadow: var(--shadow, 0 20px 50px rgba(31, 42, 73, 0.12));
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 1001;
  font-weight: 600;
}

.main-nav-menu .sub-menu a {
  display: block;
  padding: 0.45em 1.1em;
  white-space: nowrap;
}

.main-nav-menu .sub-menu .sub-menu {
  left: 100%;
  top: 0;
}

.main-nav-menu li:hover > .sub-menu,
.main-nav-menu li:focus-within > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.main-nav a:hover {
  color: var(--primary, #1f2a49);
}

@media (max-width: 980px) {
  .site-header .main-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 20px;
    right: 20px;
    background: #fff;
    border: 1px solid var(--line, #f4f0e9);
    border-radius: 18px;
    box-shadow: var(--shadow, 0 20px 50px rgba(31, 42, 73, 0.12));
    padding: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header .main-nav.open {
    display: flex;
  }

  .site-header .main-nav-menu {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    width: 100%;
  }

  .site-header .main-nav-menu .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: block;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 6px 0 0 14px;
    min-width: 0;
    background: transparent;
  }

  .site-header .main-nav-menu .sub-menu a {
    white-space: normal;
    padding: 0.35em 0;
  }

  .site-header .main-nav-menu .sub-menu .sub-menu {
    padding-left: 12px;
  }
}