/* 手机左上角圆形返回（白底黑箭头）；桌面/平板隐藏；首页隐藏 */
.m-back {
  display: none;
  position: fixed;
  top: 76px;
  left: 14px;
  z-index: 980;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  color: #282323;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  -webkit-tap-highlight-color: transparent;
}
.m-back svg {
  display: block;
  margin-left: -1px;
}
.m-back:active {
  transform: scale(0.96);
  background: #f8fafc;
}
.navbar.nav-open ~ .m-back {
  display: none !important;
}
/* 首页 / 一级聚合页首屏即隐藏，避免等 JS 才 hidden 造成闪一下 */
body.is-home .m-back,
body.algo-page .m-back,
body.nw-page .m-back,
body.ab-page .m-back {
  display: none !important;
}
@media (max-width: 768px),
       (min-width: 1200px) and (max-width: 1650px) and (min-aspect-ratio: 4/3) and (max-aspect-ratio: 29/20),
       (min-width: 769px) and (max-width: 1199px) and (max-aspect-ratio: 3/2),
       (min-width: 769px) and (max-width: 1200px) and (max-aspect-ratio: 3/4),
       (spanning: single-fold-vertical),
       (spanning: single-fold-horizontal),
       (horizontal-viewport-segments: 2),
       (horizontal-viewport-segments: 3),
       (vertical-viewport-segments: 2),
       (vertical-viewport-segments: 3) {
  :root {
    --av-m-back-size: 36px;
    --av-m-back-gap: 10px;
    /* 按钮宽 + 与内容间距，供吸顶条左侧让位 */
    --av-m-back-slot: calc(var(--av-m-back-size) + 8px);
  }
  .m-back:not([hidden]) {
    display: inline-flex;
    width: var(--av-m-back-size);
    height: var(--av-m-back-size);
    /* 贴在导航下吸顶条的左槽内，不再压住搜索/tabs */
    top: calc(var(--av-nav-h, 64px) + var(--av-m-back-gap));
    left: var(--av-m-back-gap);
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.12);
  }
  /*
   * 有吸顶工具条的详情页：左侧让出返回槽，避免盖住搜索/章节导航。
   * 页内可见面包屑工具条时仍隐藏浮层返回（见下方规则）。
   */
  body.algo-detail-page .algo-d-bar-inner,
  body.sol-detail-body .sol-detail-bar-inner,
  body.cs-detail .sol-detail-bar-inner,
  .sol-detail-page .sol-detail-bar-inner,
  body:has(main.pd-page) .pd-subnav-inner,
  body:has(.pd-page.pd-hero) .pd-subnav-inner,
  body:has(#main-content.pd-page) .pd-subnav-inner,
  body.nw-detail .page-toolbar-inner,
  body.nw-detail .nw-detail-bar-inner {
    padding-left: calc(var(--av-m-back-gap) + var(--av-m-back-slot)) !important;
    box-sizing: border-box !important;
  }
  /*
   * 页内可见面包屑工具条时隐藏浮层返回。
   * 详情条 .sol-detail-crumb / .algo-d-crumb / .pd-breadcrumb 在折叠端已隐藏，改用 .m-back，故不列入。
   */
  body:has(.ph-crumb) .m-back,
  body:has(.ps-crumb) .m-back,
  body:has(.sol-hub-crumb) .m-back,
  body:has(.cs-hub-crumb) .m-back,
  body:has(.case-crumb) .m-back,
  body.nw-page:not(.nw-detail) .m-back,
  body.ab-page .m-back {
    display: none !important;
  }
}

/* GEO：站点顶栏语义容器；具体定位仍由 .navbar 承担 */
.site-header {
  display: block;
}

.navbar {
  /* fixed: layout.css html/body{height:100%} limits sticky containing block to viewport */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: #000;
  border-bottom: none;
  /* 盖住与 Banner 之间的亚像素白缝（body 浅底会透出） */
  box-shadow: 0 1px 0 #000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 48px;
  height: 64px;
  box-sizing: border-box;
}
/* 顶栏磨砂放在伪元素，避免 backdrop-filter 把下拉变成子层、模糊失效 */
.navbar::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: -1px;
  z-index: 0;
  pointer-events: none;
  background: #000;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar .logo-img {
  height: 36px;
  width: auto;
  display: block;
  position: absolute;
  left: 48px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
}

.navbar .nav-links {
  display: flex;
  margin: 0 auto;
  align-items: stretch;
  height: 100%;
  position: relative;
  z-index: 2;
}

.navbar .nav-links > a,
.navbar .nav-links > .nav-item {
  flex-shrink: 0;
  height: 100%;
}

.navbar .nav-links > a,
.navbar .nav-item > a {
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 400;
  line-height: 1;
  transition: color 0.2s;
  position: relative;
  padding: 0 18px;
  height: 100%;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  box-sizing: border-box;
}

.navbar .nav-links > a:hover,
.navbar .nav-item > a:hover,
.navbar .nav-item > a.active,
.navbar .nav-links > a.active {
  color: #fff;
}

.navbar .nav-links > a::after,
.navbar .nav-item > a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  max-width: calc(100% - 4px);
  height: 3px;
  background: #c30d23;
  border-radius: 0;
  transform: translateX(-50%);
  transition: width 0.3s ease;
  z-index: 1;
}

.navbar .nav-links > a.active::after,
.navbar .nav-item > a.active::after,
.navbar .nav-links > a:hover::after,
.navbar .nav-item:hover > a::after,
.navbar .nav-item.open > a::after,
.navbar .nav-item.open:focus-within > a::after {
  width: calc(100% - 0px);
}

/* 展开/悬停时红线压在下拉之上，不被面板顶边盖住 */
.navbar .nav-item.open > a,
.navbar .nav-item:hover > a {
  z-index: 220;
}

.navbar .nav-item {
  position: relative;
  display: flex;
  align-items: stretch;
}

/* Flush to navbar bottom: no translateY gap */
.navbar .nav-item.open > .dropdown-menu {
  display: block;
  visibility: visible;
  pointer-events: auto;
}
.navbar .nav-item.open > .dropdown-menu.mega-menu,
.navbar .nav-item.open > .dropdown-menu.cols-2 {
  display: flex !important;
  width: 443px !important;
  min-width: 443px !important;
  max-width: 443px !important;
}
.navbar .nav-item.open > .dropdown-menu.mega-menu.mega-cascade,
.navbar .nav-item.open > .dropdown-menu.mega-menu.mega-overview {
  width: min(1120px, calc(100vw - 40px)) !important;
  min-width: 720px !important;
  max-width: min(1120px, calc(100vw - 40px)) !important;
}
.navbar .nav-item.open > .dropdown-menu.mega-menu.mega-browse,
.navbar .nav-item.open > .dropdown-menu.mega-menu.mega-sol {
  width: 100% !important;
  min-width: 0 !important;
  max-width: none !important;
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
}
.navbar .nav-item.open > .dropdown-menu.cols-2 {
  width: 520px !important;
  min-width: 520px !important;
  max-width: 520px !important;
}

.navbar .dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  /* 不向上叠 1px，避免挡住导航底红线 */
  margin-top: 0;
  background: transparent;
  isolation: isolate;
  width: 200px;
  min-width: 200px;
  max-width: 200px;
  max-height: 60vh;
  overflow-y: auto;
  padding: 8px 0;
  border-radius: 0 0 4px 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  /* 关闭用 display:none，避免 visibility 时毛玻璃层先卸、文字残留 */
  display: none;
  opacity: 1;
  visibility: hidden;
  pointer-events: none;
  transition: none;
  z-index: 200;
  box-sizing: border-box;
}
/* Aero 毛玻璃：模糊盖住的页面，而不是只改面板透明度 */
.navbar .dropdown-menu::before {
  content: "";
  position: absolute !important;
  inset: 0;
  width: auto;
  height: auto;
  z-index: 0;
  flex: none;
  pointer-events: none;
  background: rgba(31, 31, 31, 0.9);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  /* 无上边框：与导航底红线衔接，参考方案 mega */
  border-top: none;
  border-radius: inherit;
  box-sizing: border-box;
}
.navbar .dropdown-menu > * {
  position: relative;
  z-index: 1;
}
/* single-col links fill the 200px box */
.navbar .dropdown-menu:not(.mega-menu):not(.cols-2) a {
  display: block;
  width: 100%;
  box-sizing: border-box;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.navbar .nav-item > a .nav-caret {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.65;
  transition: transform 0.25s ease, opacity 0.2s;
}

.navbar .nav-item.open > a,
.navbar .nav-item.open > a.active {
  color: #fff;
}
.navbar .nav-item.open > a .nav-caret {
  transform: rotate(180deg);
  opacity: 1;
}

.navbar .nav-item > a:focus-visible,
.navbar .dropdown-menu a:focus-visible {
  outline: 2px solid rgba(255, 51, 71, 0.6);
  outline-offset: 2px;
  border-radius: 2px;
}

.navbar .dropdown-menu a {
  display: block;
  padding: 10px 20px;
  color: #e5e5e5;
  font-size: var(--av-fs-caption, 13px);
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
}

.navbar .dropdown-menu a:hover,
.navbar .dropdown-menu a.active {
  color: #ff3347;
  background: rgba(255, 51, 71, 0.1);
}

.navbar .dropdown-menu::-webkit-scrollbar { width: 6px; }
.navbar .dropdown-menu::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.9);
  border-radius: 4px;
}
.navbar .dropdown-menu::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.25);
  border-radius: 4px;
}
.navbar .dropdown-menu {
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.25) rgba(0, 0, 0, 0.9);
}

.navbar .dropdown-menu.cols-2 {
  width: 520px !important;
  min-width: 520px !important;
  max-width: 520px !important;
  padding: 12px 0;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: none;
  box-sizing: border-box;
}
.navbar .dropdown-menu.cols-2 .dropdown-col {
  flex: 1 1 0;
  min-width: 0 !important;
  width: auto;
  overflow: hidden;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  box-sizing: border-box;
}
.navbar .dropdown-menu.cols-2 .dropdown-col a {
  display: block;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}
.navbar .dropdown-menu.cols-2 .dropdown-col:last-child { border-right: none; }
.navbar .dropdown-menu.cols-2 a.group-header {
  font-weight: 700;
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
  white-space: nowrap;
  text-overflow: ellipsis;
}
.navbar .dropdown-menu.cols-2 a {
  white-space: normal;
  word-break: break-word;
  overflow-wrap: anywhere;
  line-height: 1.4;
  padding-left: 16px;
  padding-right: 16px;
}

.navbar .dropdown-menu.mega-menu {
  width: 443px !important;
  min-width: 443px !important;
  max-width: 443px !important;
  padding: 12px 0;
  align-items: stretch;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: none;
  max-height: none;
  overflow-y: visible;
  box-sizing: border-box;
}

/* 产品中心 mega：对齐 8.17 原型 — 通栏深灰、左系列右产品、无搜索条 */
.navbar .nav-item.has-mega-overview {
  position: static;
}
.navbar .dropdown-menu.mega-menu.mega-browse {
  /* 与行业方案 mega-sol 对齐：展开区固定 442px */
  --mega-browse-body-h: 442px;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  transform: none;
  width: 100% !important;
  min-width: 0 !important;
  max-width: none !important;
  margin: 0 !important;
  padding: 0;
  height: 442px !important;
  min-height: 442px !important;
  max-height: 442px !important;
  overflow: hidden !important;
  flex-direction: column;
  background: transparent;
  z-index: 1100;
  border-radius: 0;
  border: none;
  box-shadow: none;
  transition: none;
}
.navbar .dropdown-menu.mega-menu.mega-browse::before {
  border-top: none;
  border-radius: 0;
  /* 通栏 mega 禁止 backdrop-filter：全宽毛玻璃会卡顿展开/收起数秒 */
  background: rgba(28, 28, 28, 0.98);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.navbar .nav-item.open > .dropdown-menu.mega-menu.mega-browse {
  display: flex !important;
  width: 100% !important;
  max-width: none !important;
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
}
/* 桌面原型无搜索；移动端再显示 */
.navbar .mega-browse .mega-hy-search {
  display: none;
}
.navbar .mega-browse .mega-hy-search-ico {
  width: 18px;
  height: 18px;
  color: rgba(255, 255, 255, 0.45);
  flex: 0 0 auto;
}
.navbar .mega-browse .mega-hy-search-input {
  flex: 1 1 auto;
  min-width: 0;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
  padding: 0 12px;
  font-size: var(--av-fs-caption, 13px);
  outline: none;
}
.navbar .mega-browse .mega-hy-search-input::placeholder {
  color: rgba(255, 255, 255, 0.35);
}
.navbar .mega-browse .mega-hy-search-input:focus {
  border-color: rgba(255, 51, 71, 0.55);
  background: rgba(255, 51, 71, 0.06);
}
.navbar .mega-browse .mega-hy-body {
  display: flex;
  flex: 1 1 auto;
  align-items: stretch;
  min-height: 0;
  height: 442px !important;
  min-height: 442px !important;
  max-height: 442px !important;
  width: 100%;
  max-width: var(--site-maxw);
  margin: 0 auto;
  padding: 0;
  box-sizing: border-box;
  overflow: hidden;
}
.navbar .mega-browse .mega-hy-nav {
  flex: 0 0 248px;
  width: 248px;
  max-width: none;
  min-width: 220px;
  align-self: stretch;
  height: auto;
  overflow-x: hidden;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0 16px;
  box-sizing: border-box;
  background: rgba(0, 0, 0, 0.18);
}
.navbar .mega-browse .mega-hy-content {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  padding: 20px 36px 16px 32px;
  background: transparent;
  overflow: hidden;
}
.navbar .mega-browse .mega-hy-group { margin-bottom: 28px; }
.navbar .mega-browse .mega-hy-group:last-child { margin-bottom: 0; }
.navbar .mega-browse .mega-hy-group-hd {
  position: relative;
  display: flex;
  align-items: stretch;
  width: 100%;
  margin: 0 0 10px;
  background: transparent;
  border-radius: 0;
  overflow: visible;
  box-sizing: border-box;
}
.navbar .mega-browse .mega-hy-group-t,
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-group-t {
  flex: 1 1 auto;
  min-width: 0;
  display: block;
  margin: 0;
  padding: 0 20px 10px 20px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  text-decoration: none;
  background: transparent;
  border-radius: 0;
}
.navbar .dropdown-menu.mega-browse a.mega-hy-group-t:hover,
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-group-t:hover,
.navbar .mega-browse .mega-hy-group-t:hover {
  color: #fff !important;
  background: transparent;
}
.navbar .mega-browse .mega-hy-group-fold {
  display: none;
}
.navbar .mega-browse .mega-hy-group-fold-ico {
  display: block;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-top: -3px;
  transition: transform 0.2s ease, margin 0.2s ease;
}
.navbar .mega-browse .mega-hy-group.is-collapsed .mega-hy-group-fold-ico {
  transform: rotate(-45deg);
  margin-top: 0;
  margin-left: -2px;
}
.navbar .mega-browse .mega-hy-group.is-collapsed .mega-hy-group-body {
  display: none;
}
.navbar .dropdown-menu.mega-browse a.mega-hy-item,
.navbar .mega-browse .mega-hy-item {
  display: flex;
  align-items: center;
  box-sizing: border-box;
  height: 38px;
  margin: 0;
  padding: 0 20px;
  color: #ccc;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.35;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  transition: color 0.15s, background 0.15s;
}
.navbar .mega-browse .mega-hy-item.is-sub {
  padding-left: 32px;
  font-size: 14px;
  color: #ccc;
}
/* 覆盖下方通用 .mega-menu a:hover 红字；hover 用白字 */
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-item:hover,
.navbar .mega-browse .mega-hy-item:hover {
  color: #fff !important;
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-item.is-active,
.navbar .mega-browse .mega-hy-item.is-active,
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-item.is-active:hover,
.navbar .mega-browse .mega-hy-item.is-active:hover {
  color: #fff !important;
  background: #4a1a1e;
  box-shadow: inset 3px 0 0 #c30d23;
}
.navbar .mega-browse .mega-hy-content-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.navbar .mega-browse .mega-hy-heading {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
}
.navbar .dropdown-menu.mega-browse a.mega-hy-more,
.navbar .mega-browse .mega-hy-more {
  display: none !important;
}
/* 默认 2 列；≥1800 三列，>1920 四列（产品 / 方案 / 案例共用断点） */
.navbar .mega-browse .mega-hy-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 32px;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  align-content: start;
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  max-height: 100%;
  padding: 0 10px 12px 0;
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.35) transparent;
}
.navbar .mega-browse .mega-hy-grid::-webkit-scrollbar { width: 6px; }
.navbar .mega-browse .mega-hy-grid::-webkit-scrollbar-track { background: transparent; }
.navbar .mega-browse .mega-hy-grid::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.35);
  border-radius: 4px;
}
.navbar .mega-browse .mega-hy-grid::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.5);
}
.navbar .dropdown-menu.mega-browse a.mega-hy-card,
.navbar .mega-browse .mega-hy-card {
  display: flex !important;
  flex-direction: row !important;
  flex-wrap: nowrap;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 0;
  min-width: 0;
  padding: 12px !important;
  margin: 0;
  border-radius: 4px;
  overflow: hidden;
  text-decoration: none;
  color: #fff;
  background: transparent;
  border: none;
  box-shadow: none;
  white-space: normal;
  transition: background 0.15s, color 0.15s;
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-browse a.mega-hy-card.is-hidden,
.navbar .mega-browse .mega-hy-card.is-hidden {
  display: none !important;
}
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-card:hover,
.navbar .mega-browse .mega-hy-card:hover {
  border: none;
  background: rgba(255, 255, 255, 0.08) !important;
  box-shadow: none;
  color: #fff !important;
  transform: none;
}
.navbar .mega-browse .mega-hy-thumb {
  display: block;
  flex: 0 0 86px;
  width: 86px;
  height: 65px;
  border-radius: 2px;
  overflow: hidden;
  border: none;
  background: #241e28;
  position: relative;
  flex-shrink: 0;
}
/* 无图：渐变底 + 轻量占位图标（避免死黑灰块） */
.navbar .mega-browse .mega-hy-card.no-thumb .mega-hy-thumb {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
    #241e28;
}
.navbar .mega-browse .mega-hy-card.no-thumb .mega-hy-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 80% at 78% 18%, rgba(195, 13, 35, 0.32), transparent 56%),
    radial-gradient(ellipse 55% 65% at 14% 88%, rgba(50, 40, 110, 0.4), transparent 55%),
    linear-gradient(155deg, #16121c 0%, #2a1830 48%, #3a1522 100%);
  pointer-events: none;
}
.navbar .mega-browse .mega-hy-card.no-thumb .mega-hy-thumb::before {
  content: "";
  position: absolute;
  z-index: 1;
  left: 50%;
  top: 50%;
  width: 26px;
  height: 22px;
  transform: translate(-50%, -50%);
  opacity: 0.42;
  background: center / contain no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Crect x='3' y='5' width='18' height='14' rx='2' stroke='%23fff' stroke-width='1.5'/%3E%3Ccircle cx='9' cy='10' r='1.6' fill='%23fff'/%3E%3Cpath d='M7 16l3.2-3.2a1 1 0 011.4 0L14 15l1.3-1.3a1 1 0 011.4 0L19 16' stroke='%23fff' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  pointer-events: none;
}
.navbar .mega-browse .mega-hy-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  background: transparent;
}
.navbar .mega-browse .mega-hy-card-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  min-width: 0;
  flex: 1 1 auto;
  padding: 0;
}
.navbar .mega-browse .mega-hy-card-t {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
  color: #fff;
  display: block;
  min-width: 0;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar .mega-browse .mega-hy-card:hover .mega-hy-card-t {
  color: #fff;
}
.navbar .mega-browse .mega-hy-card-d {
  font-size: var(--av-fs-caption, 13px);
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.55;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: anywhere;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar .mega-browse .mega-hy-card:hover .mega-hy-card-d {
  color: rgba(255, 255, 255, 0.72);
}
.navbar .mega-browse .mega-hy-empty {
  grid-column: 1 / -1;
  padding: 48px 16px;
  text-align: center;
  color: rgba(255, 255, 255, 0.45);
  font-size: var(--av-fs-caption, 13px);
}

/* 方案 / 案例卡片：缩略图与后台提示 86×64 对齐（勿再放大成 107×82 + contain 出白边） */
.navbar .dropdown-menu.mega-menu.mega-sol {
  --mega-card-pad: 12px;
  --mega-card-gap: 12px;
  --mega-card-thumb-w: 86px;
  --mega-card-thumb-h: 64px;
}
.navbar .nav-item.has-mega-sol {
  position: static;
}
.navbar .dropdown-menu.mega-menu.mega-sol {
  /* 三行可视高度：卡片高 = 内边距×2 + 缩略图高（与产品中心同距） */
  --mega-sol-card-h: calc(var(--mega-card-pad, 12px) * 2 + var(--mega-card-thumb-h, 82px));
  --mega-sol-row-gap: 12px;
  --mega-sol-scroll-view-h: 402px;
  --mega-sol-foot-h: 40px;
  --mega-sol-body-h: 442px;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  transform: none;
  width: 100% !important;
  min-width: 0 !important;
  max-width: none !important;
  margin: 0 !important;
  padding: 0;
  height: var(--mega-sol-body-h) !important;
  max-height: var(--mega-sol-body-h) !important;
  overflow: hidden !important;
  flex-direction: column;
  background: transparent;
  z-index: 1100;
  border-radius: 0;
  border: none;
  box-shadow: none;
  transition: none;
}
.navbar .dropdown-menu.mega-menu.mega-sol::before {
  border-top: none;
  border-radius: 0;
  /* 通栏 mega 禁止 backdrop-filter：全宽毛玻璃会卡顿展开/收起数秒 */
  background: rgba(28, 28, 28, 0.98);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.navbar .mega-sol-body {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  width: 100%;
  max-width: var(--site-maxw);
  height: var(--mega-sol-body-h);
  max-height: var(--mega-sol-body-h);
  margin: 0 auto;
  min-height: 0;
  overflow: hidden;
  box-sizing: border-box;
}
.navbar .mega-sol-nav {
  flex: 0 0 248px;
  width: 248px;
  max-width: none;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 20px 0 16px;
  box-sizing: border-box;
  background: rgba(0, 0, 0, 0.18);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  overflow-x: hidden;
  overflow-y: auto;
}
.navbar .dropdown-menu.mega-sol button.mega-sol-tab,
.navbar .mega-sol-tab {
  display: flex;
  align-items: center;
  width: 100%;
  height: 38px;
  margin: 0;
  padding: 0 20px;
  font: inherit;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.35;
  text-align: left;
  color: #ccc;
  text-decoration: none;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  box-sizing: border-box;
  transition: color 0.15s, background 0.15s;
}
.navbar .dropdown-menu.mega-sol button.mega-sol-tab:hover,
.navbar .mega-sol-tab:hover {
  color: #fff !important;
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}
.navbar .dropdown-menu.mega-sol button.mega-sol-tab.is-active,
.navbar .mega-sol-tab.is-active,
.navbar .dropdown-menu.mega-sol button.mega-sol-tab.is-active:hover,
.navbar .mega-sol-tab.is-active:hover {
  color: #fff !important;
  background: #4a1a1e;
  box-shadow: inset 3px 0 0 #c30d23;
}
.navbar .mega-sol-content {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: transparent;
}
.navbar .mega-sol-panel {
  display: none;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}
.navbar .mega-sol-panel.is-active {
  display: flex;
}
.navbar .mega-sol-scroll {
  flex: 0 0 var(--mega-sol-scroll-view-h);
  width: 100%;
  height: var(--mega-sol-scroll-view-h);
  max-height: var(--mega-sol-scroll-view-h);
  overflow-x: hidden;
  overflow-y: auto;
  padding: 20px 36px 16px 32px;
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.22) transparent;
}
.navbar .mega-sol-scroll::-webkit-scrollbar { width: 6px; }
.navbar .mega-sol-scroll::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.22);
  border-radius: 4px;
}
.navbar .mega-sol-ind {
  margin: 0 0 16px;
}
.navbar .mega-sol-ind + .mega-sol-ind {
  margin-top: 4px;
}
.navbar .mega-sol-ind:last-child {
  margin-bottom: 6px;
}
.navbar .mega-sol-ind-t {
  margin: 0 0 10px;
  padding: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
}
.navbar .mega-sol-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: auto;
  gap: 12px 32px;
  align-content: start;
  padding: 0 10px 12px 0;
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-sol a.mega-sol-card,
.navbar .mega-sol-card {
  display: flex !important;
  flex-direction: row !important;
  flex-wrap: nowrap;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-width: 0;
  min-height: 0;
  height: auto;
  max-height: none;
  padding: 12px !important;
  margin: 0;
  border-radius: 4px;
  overflow: hidden;
  text-decoration: none;
  color: #fff;
  background: transparent;
  border: none;
  box-shadow: none;
  box-sizing: border-box;
  transition: background 0.15s, color 0.15s;
  white-space: normal;
}
.navbar .dropdown-menu.mega-sol a.mega-sol-card:hover,
.navbar .mega-sol-card:hover {
  border: none;
  background: rgba(255, 255, 255, 0.08) !important;
  box-shadow: none;
  color: #fff !important;
  transform: none;
}
.navbar .mega-sol-thumb {
  display: block;
  flex: 0 0 var(--mega-card-thumb-w, 86px);
  width: var(--mega-card-thumb-w, 86px);
  height: var(--mega-card-thumb-h, 64px);
  border-radius: 2px;
  overflow: hidden;
  border: none;
  background: #1a1a1a;
  position: relative;
  flex-shrink: 0;
}
.navbar .mega-sol-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  background: #1a1a1a;
}
/* 无图：与产品中心 mega-hy 同步 — 渐变底 + 轻量占位图标 */
.navbar .mega-sol-card.no-thumb .mega-sol-thumb {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
    #241e28;
}
.navbar .mega-sol-card.no-thumb .mega-sol-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 80% at 78% 18%, rgba(195, 13, 35, 0.32), transparent 56%),
    radial-gradient(ellipse 55% 65% at 14% 88%, rgba(50, 40, 110, 0.4), transparent 55%),
    linear-gradient(155deg, #16121c 0%, #2a1830 48%, #3a1522 100%);
  pointer-events: none;
}
.navbar .mega-sol-card.no-thumb[data-grad="ai"] .mega-sol-thumb::after {
  background:
    radial-gradient(ellipse 70% 80% at 78% 18%, rgba(195, 13, 35, 0.42), transparent 56%),
    radial-gradient(ellipse 50% 60% at 12% 88%, rgba(40, 20, 80, 0.45), transparent 55%),
    linear-gradient(160deg, #1a1018 0%, #3a0d14 48%, #6e141b 100%);
}
.navbar .mega-sol-card.no-thumb[data-grad="av"] .mega-sol-thumb::after {
  background:
    radial-gradient(ellipse 65% 75% at 22% 20%, rgba(30, 70, 140, 0.38), transparent 55%),
    radial-gradient(ellipse 55% 70% at 88% 82%, rgba(195, 13, 35, 0.32), transparent 52%),
    linear-gradient(160deg, #0c121c 0%, #161028 50%, #2a1218 100%);
}
.navbar .mega-sol-card.no-thumb .mega-sol-thumb::before {
  content: "";
  position: absolute;
  z-index: 1;
  left: 50%;
  top: 50%;
  width: 26px;
  height: 22px;
  transform: translate(-50%, -50%);
  opacity: 0.42;
  background: center / contain no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Crect x='3' y='5' width='18' height='14' rx='2' stroke='%23fff' stroke-width='1.5'/%3E%3Ccircle cx='9' cy='10' r='1.6' fill='%23fff'/%3E%3Cpath d='M7 16l3.2-3.2a1 1 0 011.4 0L14 15l1.3-1.3a1 1 0 011.4 0L19 16' stroke='%23fff' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  pointer-events: none;
}
.navbar .mega-sol-card-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  min-width: 0;
  flex: 1 1 auto;
  padding: 0;
}
.navbar .mega-sol-card-t {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.35;
  color: #fff;
  white-space: normal;
  word-break: break-word;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
  line-clamp: 1;
  overflow: hidden;
}
.navbar .mega-sol-card-d {
  font-size: var(--av-fs-caption, 13px);
  font-weight: 400;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.55);
  white-space: normal;
  word-break: break-word;
  overflow-wrap: anywhere;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar .mega-sol-card:hover .mega-sol-card-d {
  color: rgba(255, 255, 255, 0.72);
}
.navbar .mega-sol-empty {
  padding: 48px 16px;
  text-align: center;
  color: rgba(255, 255, 255, 0.45);
  font-size: var(--av-fs-caption, 13px);
}
.navbar .mega-sol-foot {
  flex: 0 0 var(--mega-sol-foot-h);
  height: var(--mega-sol-foot-h);
  max-height: var(--mega-sol-foot-h);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  box-sizing: border-box;
  overflow: hidden;
}
.navbar .dropdown-menu.mega-sol a.mega-sol-more,
.navbar .mega-sol-more {
  font-size: var(--av-fs-caption, 13px);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
}
.navbar .dropdown-menu.mega-sol a.mega-sol-more:hover,
.navbar .mega-sol-more:hover {
  color: #fff !important;
}
@media (min-width: 1800px) and (max-width: 1920px) {
  /* 3 列：产品 / 方案 / 案例各自显式写死，避免变量牵连把产品中心弄乱 */
  .navbar .mega-browse .mega-hy-grid,
  .navbar .mega-sol-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px 18px;
  }
  .navbar .mega-browse .mega-hy-thumb {
    flex: 0 0 86px;
    width: 86px;
    height: 65px;
  }
  .navbar .mega-sol-thumb {
    flex: 0 0 86px;
    width: 86px;
    height: 64px;
  }
  .navbar .mega-browse .mega-hy-card,
  .navbar .mega-sol-card,
  .navbar .dropdown-menu.mega-browse a.mega-hy-card,
  .navbar .dropdown-menu.mega-sol a.mega-sol-card {
    gap: 10px;
    padding: 10px !important;
  }
  .navbar .mega-browse .mega-hy-card-t,
  .navbar .mega-sol-card-t {
    font-size: 13px;
    line-height: 1.4;
  }
}
@media (min-width: 1921px) {
  .navbar .mega-browse .mega-hy-grid,
  .navbar .mega-sol-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
@media (max-width: 1100px) {
  .navbar .mega-browse .mega-hy-nav {
    flex-basis: 220px;
    width: 220px;
    min-width: 200px;
  }
  .navbar .mega-browse .mega-hy-grid,
  .navbar .mega-sol-grid {
    gap: 10px 24px;
  }
  .navbar .mega-browse .mega-hy-thumb {
    flex: 0 0 86px;
    width: 86px;
    height: 65px;
  }
  .navbar .mega-sol-thumb {
    flex: 0 0 86px;
    width: 86px;
    height: 64px;
  }
}
@media (max-width: 900px) {
  .navbar .mega-sol-nav {
    flex-basis: 200px;
    width: 200px;
  }
  .navbar .mega-sol-scroll {
    padding: 20px 20px 12px;
  }
}

/* 旧全展开样式保留（当前未挂载） */
.navbar .dropdown-menu.mega-menu.mega-overview {
  left: 50%;
  transform: translateX(-50%);
  width: min(1120px, calc(100vw - 40px)) !important;
  min-width: 720px !important;
  max-width: min(1120px, calc(100vw - 40px)) !important;
  padding: 0;
  max-height: min(78vh, 640px);
  overflow: hidden;
  display: flex !important;
  flex-direction: row;
  align-items: stretch;
  background: transparent;
}
.navbar .dropdown-menu.mega-overview .mega-ov-main {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-width: 0;
  max-height: min(78vh, 640px);
  overflow-x: hidden;
  overflow-y: auto;
}
.navbar .dropdown-menu.mega-overview .mega-ov-col {
  padding: 16px 20px 20px;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-overview .mega-ov-col:last-child {
  border-right: none;
}
.navbar .dropdown-menu.mega-overview .mega-ov-line {
  display: block;
  margin: 0 0 14px;
  padding: 8px 10px;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
}
.navbar .dropdown-menu.mega-overview .mega-ov-line:hover {
  color: #ff3347;
  background: rgba(255, 51, 71, 0.12);
}
.navbar .dropdown-menu.mega-overview .mega-ov-series {
  margin: 0 0 16px;
}
.navbar .dropdown-menu.mega-overview .mega-ov-series-title {
  display: block;
  padding: 4px 8px 6px;
  margin: 0 0 2px;
  font-size: var(--av-fs-caption, 13px);
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.navbar .dropdown-menu.mega-overview .mega-ov-series-title:hover {
  color: #ff3347;
}
.navbar .dropdown-menu.mega-overview .mega-ov-sub-title,
.navbar .dropdown-menu.mega-overview .mega-ov-sub-label {
  display: block;
  padding: 8px 8px 2px 12px;
  font-size: var(--av-fs-caption, 13px);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
}
.navbar .dropdown-menu.mega-overview .mega-ov-sub-title:hover {
  color: #ff3347;
}
.navbar .dropdown-menu.mega-overview .mega-ov-sub-label {
  color: rgba(255, 255, 255, 0.45);
  font-weight: 400;
}
.navbar .dropdown-menu.mega-overview .mega-ov-divider {
  display: block;
  height: 0;
  margin: 10px 8px 8px 12px;
  border: 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.18);
}
.navbar .dropdown-menu.mega-overview .mega-ov-prod {
  display: block;
  padding: 4px 8px 4px 20px;
  font-size: var(--av-fs-caption, 13px);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.62);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar .dropdown-menu.mega-overview .mega-ov-prod:hover {
  color: #ff3347;
  background: rgba(255, 51, 71, 0.08);
}
.navbar .dropdown-menu.mega-overview .mega-ov-aside {
  flex: 0 0 240px;
  width: 240px;
  padding: 16px 14px;
  box-sizing: border-box;
  background: rgba(255, 255, 255, 0.04);
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: min(78vh, 640px);
  overflow-y: auto;
}
.navbar .dropdown-menu.mega-overview .mega-ov-feat {
  display: block;
  padding: 12px 12px;
  border-radius: 6px;
  text-decoration: none;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color 0.2s, background 0.2s;
}
.navbar .dropdown-menu.mega-overview .mega-ov-feat:hover {
  border-color: rgba(255, 51, 71, 0.4);
  background: rgba(255, 51, 71, 0.1);
}
.navbar .dropdown-menu.mega-overview .mega-ov-feat-t {
  display: block;
  font-size: var(--av-fs-caption, 13px);
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.navbar .dropdown-menu.mega-overview .mega-ov-feat-d {
  display: block;
  font-size: var(--av-fs-caption, 13px);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.5);
}
.navbar .dropdown-menu.mega-overview .mega-ov-feat:hover .mega-ov-feat-t {
  color: #ff3347;
}

/* 旧三列级联（保留兼容，当前未使用） */
.navbar .dropdown-menu.mega-menu.mega-cascade {
  width: min(1080px, calc(100vw - 40px)) !important;
  min-width: 760px !important;
  max-width: min(1080px, calc(100vw - 40px)) !important;
  padding: 0;
  max-height: min(72vh, 560px);
  overflow: hidden;
}
.navbar .dropdown-menu.mega-cascade .mega-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-height: min(72vh, 560px);
  overflow-x: hidden;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-cascade .mega-pane:last-child { border-right: none; }
.navbar .dropdown-menu.mega-cascade .mega-pane-series {
  flex: 0 0 220px;
  width: 220px;
  padding: 10px 0;
}
.navbar .dropdown-menu.mega-cascade .mega-pane-sub {
  flex: 0 0 180px;
  width: 180px;
  padding: 10px 0;
  background: rgba(255, 255, 255, 0.02);
}
.navbar .dropdown-menu.mega-cascade:not(.has-sub) .mega-pane-sub {
  display: none;
}
.navbar .dropdown-menu.mega-cascade .mega-pane-products {
  flex: 1 1 auto;
  min-width: 420px;
  padding: 16px 18px 14px;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(ellipse 80% 60% at 85% 20%, rgba(255, 51, 71, 0.08), transparent 55%),
    linear-gradient(180deg, #141414 0%, #0a0a0a 100%);
}
.navbar .dropdown-menu.mega-cascade a.group-header {
  margin: 4px 8px 6px;
  border-radius: 4px;
}
.navbar .dropdown-menu.mega-cascade .mega-series-item,
.navbar .dropdown-menu.mega-cascade .mega-sub-item {
  display: block;
  padding: 10px 16px;
  color: #e5e5e5;
  font-size: var(--av-fs-caption, 13px);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.navbar .dropdown-menu.mega-cascade .mega-series-item.is-active,
.navbar .dropdown-menu.mega-cascade .mega-sub-item.is-active,
.navbar .dropdown-menu.mega-cascade .mega-series-item:hover,
.navbar .dropdown-menu.mega-cascade .mega-sub-item:hover {
  color: #ff3347;
  background: rgba(255, 51, 71, 0.1);
}
.navbar .dropdown-menu.mega-cascade .mega-prod-panel {
  display: none;
  flex-direction: column;
  gap: 12px;
  min-height: 100%;
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-panel.is-active {
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
  flex: 1 1 auto;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding: 0;
  overflow: hidden;
  border-radius: 4px;
  color: #e5e5e5;
  text-decoration: none;
  white-space: normal;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-card:hover {
  background: rgba(255, 51, 71, 0.1);
  border-color: rgba(255, 51, 71, 0.35);
  color: #fff;
  transform: translateY(-1px);
}
.navbar .dropdown-menu.mega-cascade .mega-prod-thumb {
  display: block;
  flex: 0 0 auto;
  width: 100%;
  height: 72px;
  border-radius: 0;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)),
    #282323;
  position: relative;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-card.no-thumb .mega-prod-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(255, 51, 71, 0.25), transparent 45%),
    radial-gradient(circle at 70% 70%, rgba(255, 255, 255, 0.06), transparent 40%);
}
.navbar .dropdown-menu.mega-cascade .mega-prod-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-text {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 8px 10px;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-title {
  font-size: var(--av-fs-caption, 13px);
  font-weight: 700;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.navbar .dropdown-menu.mega-cascade .mega-prod-desc {
  font-size: var(--av-fs-caption, 13px);
  color: rgba(255, 255, 255, 0.52);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.navbar .dropdown-menu.mega-cascade .mega-view-all {
  margin-top: auto;
  align-self: flex-start;
  padding: 8px 4px;
  color: #ff3347;
  font-size: var(--av-fs-caption, 13px);
  font-weight: 700;
  text-decoration: none;
}
.navbar .dropdown-menu.mega-cascade .mega-view-all:hover {
  background: transparent;
  text-decoration: underline;
}
@media (max-width: 1200px) {
  .navbar .dropdown-menu.mega-cascade .mega-prod-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (max-width: 980px) {
  .navbar .dropdown-menu.mega-cascade .mega-prod-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.navbar .dropdown-menu.mega-menu .mega-col {
  flex: 1 1 0;
  min-width: 0 !important;
  width: auto;
  max-width: none;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-menu .mega-col a,
.navbar .dropdown-menu.mega-menu .mega-row {
  width: 100%;
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-menu .mega-row > a {
  width: 100%;
  box-sizing: border-box;
}
.navbar .dropdown-menu.mega-menu .mega-col:last-child { border-right: none; }
.navbar .dropdown-menu.mega-menu a {
  display: block;
  padding: 10px 16px;
  color: #e5e5e5;
  font-size: var(--av-fs-caption, 13px);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.2s;
}
.navbar .dropdown-menu.mega-menu a.group-header {
  font-weight: 700;
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}
/* 仅覆盖通用 mega-menu a 的 block 布局；数值与上方卡片规则保持一致 */
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-card,
.navbar .dropdown-menu.mega-menu.mega-sol a.mega-sol-card {
  display: flex !important;
  flex-direction: row !important;
  align-items: center;
  white-space: normal;
}
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-card.is-hidden,
.navbar .mega-browse .mega-hy-card.is-hidden {
  display: none !important;
}
.navbar .dropdown-menu.mega-menu.mega-browse a.mega-hy-card:hover,
.navbar .dropdown-menu.mega-menu.mega-sol a.mega-sol-card:hover {
  color: #fff !important;
  background: rgba(255, 255, 255, 0.08) !important;
  transform: none;
}
.navbar .dropdown-menu.mega-menu .mega-row {
  cursor: pointer;
  position: relative;
}
.navbar .dropdown-menu.mega-menu .mega-row > a {
  display: block;
  position: relative;
  padding-right: 28px;
}
.navbar .dropdown-menu.mega-menu a:hover {
  color: #ff3347;
  background: rgba(255, 51, 71, 0.1);
}
.navbar .dropdown-menu.mega-menu .mega-row .sub-panel {
  display: none;
  padding: 4px 0 8px 8px;
  margin: 0;
  background: transparent;
  border-radius: 0;
  border: none;
}
.navbar .dropdown-menu.mega-menu .mega-row.active .sub-panel { display: block; }
.navbar .dropdown-menu.mega-menu .mega-row.active > a {
  color: #ff3347;
  background: rgba(255, 51, 71, 0.12);
}
.navbar .dropdown-menu.mega-menu .mega-row > a::after {
  content: "+";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  transition: transform 0.2s;
}
.navbar .dropdown-menu.mega-menu .mega-row.active > a::after {
  transform: translateY(-50%) rotate(45deg);
  color: #ff3347;
}
.navbar .dropdown-menu.mega-menu .sub-panel a {
  display: block;
  padding: 7px 16px 7px 28px;
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--av-fs-caption, 13px);
  white-space: nowrap;
  background: transparent;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  position: relative;
}
.navbar .dropdown-menu.mega-menu .sub-panel a:last-child { border-bottom: none; }
.navbar .dropdown-menu.mega-menu .sub-panel a::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 51, 71, 0.7);
}
.navbar .dropdown-menu.mega-menu .sub-panel a:hover {
  color: #fff;
  background: rgba(255, 51, 71, 0.14);
}
.navbar .dropdown-menu.mega-menu .sub-panel a:hover::before { background: #ff3347; }

.navbar a.nav-pending {
  opacity: 0.55;
  cursor: not-allowed;
}

.navbar .nav-toggle {
  display: none;
  position: absolute;
  right: 60px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  padding: 0;
  cursor: pointer;
  z-index: 101;
}
.navbar .nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: #fff;
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}
.navbar.nav-open .nav-toggle span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.navbar.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.navbar.nav-open .nav-toggle span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Search */
.navbar .nav-search {
  position: absolute;
  right: 48px;
  top: 50%;
  transform: translateY(-50%);
  height: 36px;
  display: flex;
  align-items: center;
  z-index: 100;
  pointer-events: none;
}
/* 仅交互：展开时容器可命中，间隙不再穿透触发 mouseleave（样式与原型一致） */
.navbar .nav-search.open {
  pointer-events: auto;
}
.navbar .nav-search-trigger {
  order: 2;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  flex-shrink: 0;
  pointer-events: auto;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}
.navbar .nav-search-trigger svg { width: 16px; height: 16px; }
.navbar .nav-search-trigger:hover,
.navbar .nav-search.open .nav-search-trigger {
  background: rgba(255, 51, 71, 0.85);
  border-color: rgba(255, 51, 71, 1);
  transform: scale(1.05);
}
.navbar .nav-search-form {
  order: 1;
  width: 0;
  height: 36px;
  margin-right: -4px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  box-shadow: none;
  overflow: hidden;
  display: flex;
  align-items: center;
  transition: width 0.32s cubic-bezier(0.4, 0, 0.2, 1), margin-right 0.32s cubic-bezier(0.4, 0, 0.2, 1), background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  pointer-events: none;
  position: relative;
}
.navbar .nav-search.open .nav-search-form {
  width: 240px;
  margin-right: 10px;
  pointer-events: auto;
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(15, 23, 42, 0.08);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}
.navbar .nav-search-input {
  flex: 1;
  height: 100%;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  padding: 0 12px 0 18px;
  font-size: 14px;
  color: #282323;
  font-family: inherit;
  line-height: 1;
}
.navbar .nav-search-input::placeholder { color: #555555; }
.navbar .nav-search-input::-webkit-search-cancel-button { display: none; }
.navbar .nav-search-submit {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: #404040;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  flex-shrink: 0;
  transition: color 0.2s, background 0.2s;
  border-radius: 50%;
}
.navbar .nav-search-submit:hover { color: #c30d23; background: rgba(195, 13, 35, 0.08); }
.navbar .nav-search-submit svg { width: 16px; height: 16px; }

/* fixed nav is out of flow; padding reserves space; unlock height:100% for page sticky */
body.has-nav-v2 {
  padding-top: 64px !important;
  height: auto !important;
  min-height: 100%;
}
/* 首页：导航叠在 Hero 上；默认深色半透，悬停/开菜单/滚动后近实底 */
body.has-nav-v2.is-home {
  padding-top: 0 !important;
}
body.has-nav-v2.is-home .navbar {
  background: transparent;
  border-bottom: none;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  transition: box-shadow 0.28s ease;
}
body.has-nav-v2.is-home .navbar::before {
  bottom: 0;
  background: rgba(0, 0, 0, 0.62);
  transition: background 0.28s ease;
}
body.has-nav-v2.is-home .navbar:hover::before,
body.has-nav-v2.is-home .navbar.nav-open::before,
body.has-nav-v2.is-home .navbar.is-scrolled::before {
  background: rgba(0, 0, 0, 0.92);
}
body.has-nav-v2.is-home .navbar:hover,
body.has-nav-v2.is-home .navbar.nav-open,
body.has-nav-v2.is-home .navbar.is-scrolled {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}
body.has-nav-v2.is-home .navbar.nav-open {
  box-shadow: none;
}
html:has(body.has-nav-v2) {
  height: auto !important;
  min-height: 100%;
}


@media (max-width: 1100px) {
  .navbar .nav-links > a,
  .navbar .nav-item > a {
    padding: 0 12px;
    font-size: var(--av-fs-caption, 13px);
  }
}

@media (max-width: 768px),
       (min-width: 1200px) and (max-width: 1650px) and (min-aspect-ratio: 4/3) and (max-aspect-ratio: 29/20),
       (min-width: 769px) and (max-width: 1199px) and (max-aspect-ratio: 3/2),
       (min-width: 769px) and (max-width: 1200px) and (max-aspect-ratio: 3/4),
       (spanning: single-fold-vertical),
       (spanning: single-fold-horizontal),
       (horizontal-viewport-segments: 2),
       (horizontal-viewport-segments: 3),
       (vertical-viewport-segments: 2),
       (vertical-viewport-segments: 3) {
  .navbar {
    padding: 0 16px;
    justify-content: flex-start;
  }
  /* 移动端首页：Banner 不叠在导航下（桌面仍可叠层） */
  body.has-nav-v2.is-home {
    padding-top: 64px !important;
  }
  body.has-nav-v2.is-home .navbar {
    background: #000;
    box-shadow: 0 1px 0 #000;
  }
  body.has-nav-v2.is-home .navbar::before {
    background: #000;
  }
  .navbar .logo-img {
    left: 16px;
    height: 24px;
  }
  .navbar .nav-toggle {
    display: block;
    right: 60px; /* 搜索圆钮左侧，互不重叠 */
    z-index: 90;
  }
  /* 全屏遮罩：挡住下方页面点击；点遮罩关闭菜单 */
  .nav-drawer-mask {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 990; /* 低于 .navbar(1000)，高于页面内容 */
    background: rgba(0, 0, 0, 0.58);
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.28s ease, visibility 0.28s ease;
  }
  body.nav-drawer-open .nav-drawer-mask {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  body.nav-drawer-open {
    overflow: hidden;
  }
  .navbar .nav-search {
    right: 16px;
    z-index: 110;
  }
  .navbar .nav-search.open .nav-search-form {
    width: min(280px, calc(100vw - 140px));
    background: #fff;
    border-color: rgba(15, 23, 42, 0.1);
  }
  /* 搜索展开：隐藏汉堡，避免与输入框叠层；Logo 保留 */
  .navbar.nav-search-open .nav-toggle {
    visibility: hidden;
    pointer-events: none;
  }
  .navbar.nav-search-open .logo-img {
    opacity: 1;
    pointer-events: auto;
  }
  .navbar .nav-search.open .nav-search-submit {
    position: relative;
    z-index: 2;
    color: #c30d23;
  }
  .navbar .nav-links {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    height: auto;
    background: rgba(0, 0, 0, 0.96);
    max-height: calc(100vh - 64px);
    max-height: calc(100dvh - 64px);
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 8px 0 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.28s ease, transform 0.32s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.28s ease;
  }
  .navbar.nav-open .nav-links {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .navbar .nav-item {
    flex-direction: column;
    align-items: stretch;
    height: auto;
  }
  /* 移动端单层导航：只保留一级入口（对齐旧版），不展开 mega / 子菜单 */
  .navbar .dropdown-menu,
  .navbar .nav-item.open > .dropdown-menu,
  .navbar .nav-item.open > .dropdown-menu.mega-menu,
  .navbar .nav-item.open > .dropdown-menu.cols-2,
  .navbar .nav-item.open > .dropdown-menu.mega-menu.mega-browse,
  .navbar .nav-item.open > .dropdown-menu.mega-menu.mega-sol {
    display: none !important;
  }
  .navbar .nav-item > a .nav-caret {
    display: none !important;
  }
  .navbar .nav-links > a,
  .navbar .nav-item > a {
    padding: 16px 20px;
    height: auto;
    width: 100%;
    box-sizing: border-box;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    justify-content: flex-start;
  }
  .navbar .nav-links > a::after,
  .navbar .nav-item > a::after {
    display: none;
  }
}

/* av-fold-mobile — fold-only extras（汉堡样式已并入上方 max-width:768 + fold 联合查询） */
/* Dual/triple fold. Excludes 1920 desktop and 16:10/3:2 laptops (max-aspect 29/20 ≈ 1.45). */
@media (min-width: 1200px) and (max-width: 1650px) and (min-aspect-ratio: 4/3) and (max-aspect-ratio: 29/20),
       (min-width: 769px) and (max-width: 1199px) and (max-aspect-ratio: 3/2),
       (min-width: 769px) and (max-width: 1200px) and (max-aspect-ratio: 3/4),
       (spanning: single-fold-vertical),
       (spanning: single-fold-horizontal),
       (horizontal-viewport-segments: 2),
       (horizontal-viewport-segments: 3),
       (vertical-viewport-segments: 2),
       (vertical-viewport-segments: 3) {

  .navbar .mega-sol-nav {
    flex-basis: 200px;
    width: 200px;
  }

  .navbar .mega-sol-scroll {
    padding: 20px 20px 12px;
  }
}

/* 窄屏/折叠锁存：JS 挂上 html.av-narrow-nav 后保持收纳导航（断点间隙不闪回 PC 顶栏） */
html.av-narrow-nav .navbar {
  padding: 0 16px;
  justify-content: flex-start;
}
body.has-nav-v2.is-home.av-narrow-nav {
  padding-top: 64px !important;
}
body.has-nav-v2.is-home.av-narrow-nav .navbar {
  background: #000;
  box-shadow: 0 1px 0 #000;
}
body.has-nav-v2.is-home.av-narrow-nav .navbar::before {
  background: #000;
}
html.av-narrow-nav .navbar .logo-img {
  left: 16px;
  height: 24px;
}
html.av-narrow-nav .navbar .nav-toggle {
  display: block;
  right: 60px;
  z-index: 90;
}
html.av-narrow-nav .nav-drawer-mask {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 990;
  background: rgba(0, 0, 0, 0.58);
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.28s ease, visibility 0.28s ease;
}
body.nav-drawer-open.av-narrow-nav .nav-drawer-mask {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
body.nav-drawer-open.av-narrow-nav {
  overflow: hidden;
}
html.av-narrow-nav .navbar .nav-search {
  right: 16px;
  z-index: 110;
}
html.av-narrow-nav .navbar .nav-search.open .nav-search-form {
  width: min(300px, calc(100vw - 140px));
  background: #fff;
  border-color: rgba(15, 23, 42, 0.1);
}
html.av-narrow-nav .navbar.nav-search-open .nav-toggle {
  visibility: hidden;
  pointer-events: none;
}
html.av-narrow-nav .navbar.nav-search-open .logo-img {
  opacity: 1;
  pointer-events: auto;
}
html.av-narrow-nav .navbar .nav-search.open .nav-search-submit {
  position: relative;
  z-index: 2;
  color: #c30d23;
}
html.av-narrow-nav .navbar .nav-links {
  display: flex;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  flex-direction: column;
  align-items: stretch;
  height: auto;
  background: rgba(0, 0, 0, 0.96);
  max-height: calc(100vh - 64px);
  max-height: calc(100dvh - 64px);
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 8px 0 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-10px);
  transition: opacity 0.28s ease, transform 0.32s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.28s ease;
}
html.av-narrow-nav .navbar.nav-open .nav-links {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}
html.av-narrow-nav .navbar .nav-item {
  flex-direction: column;
  align-items: stretch;
  height: auto;
}
html.av-narrow-nav .navbar .dropdown-menu,
html.av-narrow-nav .navbar .nav-item.open > .dropdown-menu,
html.av-narrow-nav .navbar .nav-item.open > .dropdown-menu.mega-menu,
html.av-narrow-nav .navbar .nav-item.open > .dropdown-menu.cols-2,
html.av-narrow-nav .navbar .nav-item.open > .dropdown-menu.mega-menu.mega-browse,
html.av-narrow-nav .navbar .nav-item.open > .dropdown-menu.mega-menu.mega-sol {
  display: none !important;
}
html.av-narrow-nav .navbar .nav-item > a .nav-caret {
  display: none !important;
}
html.av-narrow-nav .navbar .nav-links > a,
html.av-narrow-nav .navbar .nav-item > a {
  padding: 16px 20px;
  height: auto;
  width: 100%;
  box-sizing: border-box;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  justify-content: flex-start;
}
html.av-narrow-nav .navbar .nav-links > a::after,
html.av-narrow-nav .navbar .nav-item > a::after {
  display: none;
}