/* ====================================================================
   CESIPC header.css — Utility Bar + Main Header + Mega Menu
==================================================================== */

.util-bar {
  background: var(--c-bg-dark);
  color: rgba(255,255,255,.72);
  font-size: var(--fs-xs);
  height: 42px;
  display: flex;
  align-items: center;
}
.util-bar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  gap: var(--sp-4);
}
.util-bar__left, .util-bar__right {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.util-bar__right { gap: var(--sp-3); }
.util-bar__phone, .util-bar__email {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  white-space: nowrap;
}
.util-bar a {
  color: rgba(255,255,255,.85);
  transition: color var(--t-fast);
}
.util-bar a:hover { color: #fff; }
.util-bar__link {
  color: rgba(255,255,255,.85);
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  transition: background var(--t-fast), color var(--t-fast);
}
.util-bar__link:hover { background: rgba(255,255,255,.08); }

/* ---------- 顶栏分隔竖线 ---------- */
.util-bar__divider {
  display: inline-block;
  width: 1px;
  height: 14px;
  background: rgba(255,255,255,.18);
}

/* ---------- 社交图标组 ---------- */
.util-bar__social {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.util-bar__social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: rgba(255,255,255,.85) !important;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.util-bar__social-link:hover {
  background: rgba(255,255,255,.16);
  color: #fff !important;
  transform: translateY(-1px);
}
.util-bar__social-link svg {
  display: block;
  width: 24px !important;
  height: 24px !important;
}

/* ---------- 语言切换器 ---------- */
.lang-switcher { position: relative; }
.lang-switcher__btn {
  color: rgba(255,255,255,.85);
  font-size: var(--fs-xs);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--t-fast), color var(--t-fast);
  background: transparent;
  border: 0;
  cursor: pointer;
  line-height: 1;
  font-family: inherit;
}
.lang-switcher__btn:hover { background: rgba(255,255,255,.08); color: #fff; }
.lang-switcher__current { font-weight: 500; }
.lang-switcher__caret {
  transition: transform var(--t-fast);
  opacity: .7;
}
.lang-switcher.is-open .lang-switcher__caret { transform: rotate(180deg); }

.lang-switcher__menu {
  list-style: none;
  margin: 0;
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  background: #fff;
  min-width: 220px;
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,.18), 0 2px 8px rgba(0,0,0,.06);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--t), transform var(--t), visibility var(--t);
  z-index: 1000;
  border: 1px solid var(--c-border);
}
.lang-switcher.is-open .lang-switcher__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang-switcher__menu li { list-style: none; }
.lang-switcher__menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: 10px 12px;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: background var(--t-fast), color var(--t-fast);
}
.lang-switcher__menu a:not(.is-disabled):hover {
  background: var(--c-bg-alt);
  color: var(--c-primary);
}
.lang-switcher__name { font-weight: 500; }
.lang-switcher__hint {
  font-size: 11px;
  color: var(--c-text-muted, #6e7682);
  font-weight: 400;
}
.lang-switcher__menu a.is-active {
  background: rgba(51,117,175,.08);
  color: var(--c-primary);
  font-weight: 600;
  position: relative;
}
.lang-switcher__menu a.is-active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--c-primary);
  border-radius: 0 2px 2px 0;
}
.lang-switcher__menu a.is-disabled {
  color: #9ba3ad;
  cursor: not-allowed;
  pointer-events: none;
}
.lang-switcher__soon {
  font-size: 10px;
  background: #f0f5fa;
  color: #6e7682;
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 500;
}

.site-header {
  background: #fff;
  height: 108px;                     /* 桌面 LOGO 再 +15% 后提升 */
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 500;
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--sp-8);
}
.site-logo { flex-shrink: 0; display: block; }
.site-logo img { height: 61px; width: auto; }   /* 53 → 61，再 +15% */

/* 2K 屏 LOGO 再放大 */
@media (min-width: 1600px) {
  .site-header { height: 117px; }
  .site-logo img { height: 66px; }
}
/* 4K 屏 LOGO 再放大 */
@media (min-width: 1920px) {
  .site-header { height: 131px; }
  .site-logo img { height: 76px; }
}

/* 主导航：右对齐（logo 后留空 → 菜单/搜索/CTA 全部贴右） */
.main-nav { margin-left: auto; }
.main-nav__list { display: flex; gap: var(--sp-1); }
.main-nav__item { position: relative; }
.main-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 0 var(--sp-4);
  height: 88px;
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--c-text);
  border-bottom: 3px solid transparent;
  transition: all var(--t-fast);
  white-space: nowrap;
}
@media (min-width: 1600px) { .main-nav__link { height: 96px; } }
@media (min-width: 1920px) { .main-nav__link { height: 104px; } }
.main-nav__link:hover, .main-nav__link.is-active {
  color: var(--c-primary);
  border-bottom-color: var(--c-accent);
}

.has-mega .mega-menu {
  position: absolute;
  top: 100%;
  left: 0;                          /* 左对齐父导航项 */
  transform: translateY(-10px);
  width: 960px;
  max-width: calc(100vw - var(--sp-4) * 2);
  background: #fff;
  border-top: 3px solid var(--c-accent);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-6) var(--sp-5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t), visibility var(--t), transform var(--t);
  z-index: 400;
}
.has-mega:hover .mega-menu,
.has-mega:focus-within .mega-menu {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}
/* 解决方案/技术架构/新闻 mega 比产品中心略小 */
.has-mega.mega--md .mega-menu { width: 760px; }
.has-mega.mega--sm .mega-menu { width: 580px; }
/* 右侧菜单项防止超出右边界：右对齐 */
.has-mega.mega--right .mega-menu {
  left: auto;
  right: 0;
}
/* 小屏适应：父导航项右侧空间不足时，自动右对齐到视口右边 */
@media (max-width: 1400px) {
  .has-mega .mega-menu { width: min(960px, calc(100vw - 32px)); }
  .has-mega.mega--md .mega-menu { width: min(760px, calc(100vw - 32px)); }
  .has-mega.mega--sm .mega-menu { width: min(580px, calc(100vw - 32px)); }
}
/* 1280px 以下：将原本左对齐的产品/解决方案/技术架构 mega 改为相对屏幕右侧定位，避免第 4 列被遮挡 */
@media (max-width: 1280px) {
  .has-mega:not(.mega--right) .mega-menu {
    left: auto;
    right: 0;
  }
}
.mega-menu__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-3) var(--sp-4);
  padding: 0;
}
.mega-menu__col h4.mega-menu__title {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--c-border);
}
.mega-menu__col ul li { margin-bottom: var(--sp-2); }
.mega-menu__col a {
  display: block;
  padding: var(--sp-1) 0;
  font-size: var(--fs-sm);
  color: var(--c-text);
  font-weight: 500;
  transition: color var(--t-fast), padding-left var(--t-fast);
}
.mega-menu__col a:hover {
  color: var(--c-accent);
  padding-left: 4px;
}
.mega-menu__col--feature {
  background: var(--c-bg-alt);
  margin: calc(-1 * var(--sp-6)) calc(-1 * var(--sp-5)) calc(-1 * var(--sp-6)) 0;
  padding: var(--sp-5);
  display: flex;
  align-items: flex-end;
}
.mega-feature {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-4) var(--sp-5);
  background: var(--c-primary);
  color: #fff !important;
  border-radius: var(--radius);
  font-weight: 700;
  transition: background var(--t-fast);
}
.mega-feature:hover { background: var(--c-primary-2); color: #fff !important; }

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}
.header-icon-btn {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  transition: background var(--t-fast), color var(--t-fast);
}
.header-icon-btn:hover {
  background: var(--c-bg-alt);
  color: var(--c-primary);
}
.header-icon-btn--mobile { display: none; }

/* ============= mega menu 二级强化：解决方案 / 技术架构 / 新闻 ============= */
.mega-menu__col--wide { grid-column: span 2; }
.mega-menu__col--3col ul {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-1) var(--sp-3);
}
.mega-menu__col--2col ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-1) var(--sp-3);
}
.mega-menu__col a.mega-link-rich {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid transparent;
}
.mega-menu__col a.mega-link-rich:hover { padding-left: 0; border-bottom-color: var(--c-border); }
.mega-link-rich__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}
.mega-link-rich:hover .mega-link-rich__icon {
  background: var(--c-primary);
  color: #fff;
}
.mega-link-rich__txt {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.mega-link-rich__name {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--c-text);
  line-height: 1.3;
}
.mega-link-rich__sub {
  font-size: 11px;
  color: var(--c-muted);
  line-height: 1.3;
}

/* ============= Header 搜索栏（实时下拉） ============= */
.header-search {
  position: relative;
  display: flex;
  align-items: center;
  margin-right: var(--sp-2);
}
.header-search__form {
  display: flex;
  align-items: center;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: 0 10px 0 14px;
  width: 220px;
  height: 40px;
  transition: all var(--t-fast);
}
.header-search__form:focus-within {
  background: #fff;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(51,117,175,0.12);
  width: 280px;
}
.header-search__form svg {
  flex-shrink: 0;
  color: var(--c-muted);
  margin-right: 8px;
}
.header-search__form:focus-within svg { color: var(--c-primary); }
.header-search__input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  font-size: 13px;
  font-family: inherit;
  color: var(--c-text);
  width: 100%;
}
.header-search__input::placeholder { color: var(--c-muted); }
.header-search__toggle { display: none; }

/* 实时下拉 */
.header-search__dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 420px;
  max-width: calc(100vw - var(--sp-6) * 2);
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  max-height: min(70vh, 500px);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all var(--t-fast);
  z-index: 600;
}
.header-search__dropdown.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.header-search__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
  text-decoration: none !important;
  transition: background var(--t-fast);
}
.header-search__item:hover { background: var(--c-bg-alt); }
.header-search__item-thumb {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 6px;
  overflow: hidden;
  background: #f0f4f9;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-border);
}
.header-search__item-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: 3px;
  box-sizing: border-box;
}
.header-search__item-thumb.is-fallback {
  background: linear-gradient(135deg, var(--c-primary-soft) 0%, #eef4fb 100%);
  color: var(--c-primary);
  font-size: 18px;
  font-weight: 700;
}
.header-search__item-body {
  flex: 1;
  min-width: 0;
}
.header-search__item-cat {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 2px;
}
.header-search__item-title {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-primary);
  line-height: 1.4;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.header-search__item-desc {
  display: block;
  font-size: 11.5px;
  color: var(--c-text-2);
  line-height: 1.45;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.header-search mark {
  background: rgba(255,219,106,0.45);
  color: var(--c-primary);
  padding: 0 1px;
  border-radius: 2px;
  font-weight: 700;
}
.header-search__empty {
  padding: 16px 18px;
  font-size: 13px;
  color: var(--c-muted);
}
.header-search__more {
  display: block;
  padding: 12px 16px;
  background: var(--c-bg-alt);
  color: var(--c-primary);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  border-top: 1px solid var(--c-border);
}
.header-search__more:hover {
  background: var(--c-primary);
  color: #fff;
}

/* 紧凑屏：搜索栏折叠为图标 → 点击展开 */
@media (max-width: 1280px) {
  .header-search__form {
    width: 0;
    padding: 0;
    border: 0;
    background: transparent;
    overflow: hidden;
    transition: all var(--t);
  }
  .header-search.is-open .header-search__form {
    width: 240px;
    padding: 0 10px 0 14px;
    border: 1px solid var(--c-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(51,117,175,0.12);
  }
  .header-search__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    color: var(--c-text);
    background: transparent;
    cursor: pointer;
    transition: background var(--t-fast);
  }
  .header-search__toggle:hover {
    background: var(--c-bg-alt);
    color: var(--c-primary);
  }
  .header-search.is-open .header-search__toggle {
    color: var(--c-primary);
  }
}

@media (max-width: 1280px) {
  /* 平板：隐藏邮箱，保留电话和社交、语言 */
  .util-bar__left .util-bar__email { display: none; }
}
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .header-search { display: none; }
  .header-icon-btn--mobile { display: inline-flex; }
  .site-header__inner { justify-content: space-between; }
  /* 平板：社交图标隐藏，避免拥挤；语言切换器仅显示图标 */
  .util-bar__social { display: none; }
  .util-bar__right > .util-bar__divider:first-of-type { display: none; }
}
@media (max-width: 768px) {
  /* 移动端：隐藏电话文字，只保留 emoji icon 链接（电话），简化为最小 */
  .util-bar__left .util-bar__phone { font-size: 11px; }
  .util-bar__right { gap: 6px; }
  .lang-switcher__current { display: none; }
  .lang-switcher__btn { padding: 4px 6px; }
  .util-bar__link { padding: 4px; }
}
@media (max-width: 640px) {
  .util-bar { height: 32px; font-size: 11px; }
  .util-bar__left .util-bar__phone { white-space: normal; }
  .site-header { height: 70px; }
  .site-logo img { height: 40px; }
  .main-nav__link { height: 70px; }
  /* 极窄屏：隐藏整个左侧（电话），通过底部 sticky CTA 联系 */
  .util-bar__left { display: none; }
  .util-bar__inner { justify-content: flex-end; }
  .lang-switcher__menu { right: 0; left: auto; min-width: 200px; }
}

/* ====================================================================
   mega menu 内联 style 抽 class（替代 1486 次内联 style）
   ==================================================================== */
.mega-grid-3 { grid-template-columns: repeat(3, 1fr) !important; }
.mega-grid-2 { grid-template-columns: repeat(2, 1fr) !important; }
.mega-mt-sm { margin-top: 6px; }
.mega-mt-md { margin-top: 16px; }
.mega-mt-lg { margin-top: 18px; }

/* ====================================================================
   移动端汉堡导航（< 1024px）
   - 点击汉堡按钮 → 全屏滑出式 panel
   - mega menu 在移动端改为可点击折叠的 accordion
   ==================================================================== */
@media (max-width: 1024px) {
  /* 移动菜单 panel：从右滑出 */
  .main-nav.is-open {
    display: block !important;
    position: fixed;
    top: 88px;  /* 头部下方 */
    right: 0;
    bottom: 0;
    width: min(360px, 88vw);
    background: #fff;
    box-shadow: -10px 0 30px rgba(13,31,90,0.18);
    z-index: 600;
    overflow-y: auto;
    padding: var(--sp-4) 0;
    animation: slideInRight 0.25s ease-out;
  }
  @keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
  }
  .main-nav.is-open .main-nav__list {
    display: block;
  }
  .main-nav.is-open .main-nav__item {
    display: block;
    border-bottom: 1px solid var(--c-border);
  }
  .main-nav.is-open .main-nav__link {
    height: auto;
    padding: 14px 20px;
    font-size: 15px;
    border-bottom: 0;
    width: 100%;
    box-sizing: border-box;
  }
  .main-nav.is-open .main-nav__link.is-active {
    background: var(--c-primary-soft);
  }
  /* mega menu 在移动端默认折叠 */
  .main-nav.is-open .has-mega .mega-menu {
    position: static;
    width: 100%;
    max-width: 100%;
    opacity: 0;
    visibility: hidden;
    transform: none;
    padding: 0;
    box-shadow: none;
    border-top: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.2s ease;
  }
  .main-nav.is-open .has-mega.is-expanded .mega-menu {
    opacity: 1;
    visibility: visible;
    max-height: 1200px;
    padding: 8px 20px 16px;
    background: var(--c-bg-alt);
  }
  /* 父链接加 ▼ 指示器 */
  .main-nav.is-open .has-mega > .main-nav__link::after {
    content: "▼";
    font-size: 10px;
    color: var(--c-muted);
    margin-left: auto;
    transition: transform 0.2s ease;
  }
  .main-nav.is-open .has-mega.is-expanded > .main-nav__link::after {
    transform: rotate(180deg);
  }
  .main-nav.is-open .has-mega > .main-nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  /* mega 内部网格在移动端改单列 */
  .main-nav.is-open .mega-menu__grid {
    grid-template-columns: 1fr !important;
    gap: var(--sp-3) !important;
  }
  .main-nav.is-open .mega-menu__col h4.mega-menu__title {
    font-size: 11px;
    margin-bottom: 8px;
  }
  .main-nav.is-open .mega-menu__col a,
  .main-nav.is-open .mega-menu__col a.mega-link-rich {
    padding: 6px 0;
    font-size: 13px;
  }
  /* mega-feature CTA 在折叠版改成正常按钮 */
  .main-nav.is-open .mega-feature {
    padding: 10px 16px;
    margin-top: 10px;
  }
}