/* SiteHeader */

/* ── Header Core ── */
.SiteHeader {
  --header-container-main: min(88vw, 1600px);
  --header-padding-inline: clamp(12px, 1.25vw, 24px);
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 76px;
  z-index: var(--z-header);
  background: transparent;
  transition: background-color var(--duration-normal) var(--ease-standard),
              backdrop-filter var(--duration-normal) var(--ease-standard);
}
.SiteHeader--scrolled {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--color-border-default);
}
.SiteHeader__inner {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--header-container-main);
  margin: 0 auto;
  padding: 0 var(--header-padding-inline);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.SiteHeader__inner > nav {
  height: 100%;
  display: flex;
  align-items: center;
}
.SiteHeader__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  height: 36px;
}
.SiteHeader__logo img {
  height: 36px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  object-position: left center;
  display: block;
}
.SiteHeader__logo--mobile {
  display: none;
}
@media (max-width: 768px) {
  .SiteHeader__logo img {
    height: 28px;
  }
}

/* ── Primary Nav ── */
.SiteHeader__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0; padding: 0;
  height: 100%;
  line-height: 1;
}
.SiteHeader__navItem {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}
.SiteHeader__navLink {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 12px;
  height: 100%;
  font-size: var(--text-nav);
  font-weight: var(--font-weight-medium);
  /* 跨页面字族统一 */
  font-family: -apple-system, BlinkMacSystemFont, "system-ui", "PingFang SC", "Hiragino Sans GB", "Source Han Sans CN", "Noto Sans CJK SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--duration-fast) var(--ease-standard);
  cursor: pointer;
}
.SiteHeader__navLink:hover { color: var(--color-text-primary); }
.SiteHeader__navLink--active { color: var(--color-primary); }
/* ── Actions ── */
.SiteHeader__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
/* Header CTA 字号对齐 */
.SiteHeader__actions .btn--sm { font-size: var(--text-small); }

/* ── Mobile Nav ── */
.MobileNav {
  display: flex;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(88vw, 420px);
  background: var(--color-bg-primary);
  z-index: var(--z-overlay);
  overflow-y: auto;
  padding: 12px 18px 24px;
  flex-direction: column;
  gap: var(--space-1);
  box-shadow: -24px 0 72px rgba(5, 18, 44, .24);
  transform: translateX(105%);
  visibility: hidden;
  transition: transform var(--duration-normal) var(--ease-standard),
              visibility var(--duration-normal) var(--ease-standard);
}
.MobileNav--open { transform: translateX(0); visibility: visible; }
.MobileNav__header {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border-default);
  margin-bottom: 4px;
}
.MobileNav__brand { display: inline-flex; align-items: center; }
.MobileNav__brand img { width: auto; height: 28px; display: block; }
.MobileNav__close {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  cursor: pointer;
}
.MobileNav__close svg { width: 20px; height: 20px; }
.MobileNavOverlay {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-overlay) - 1);
  border: 0;
  padding: 0;
  background: rgba(4, 12, 28, .52);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-standard),
              visibility var(--duration-normal) var(--ease-standard);
}
.MobileNavOverlay--open { opacity: 1; visibility: visible; pointer-events: auto; }
.MobileNav__section {
  border-bottom: 1px solid var(--color-border-default);
  padding: 12px 0;
}
.MobileNav__sectionLabel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 16px;
  font-size: var(--text-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
}
.MobileNav__actions {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.MobileNavToggle {
  display: none;
  width: 44px; height: 44px;
  padding: 0;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}
.MobileNavToggle span {
  display: block;
  width: 18px; height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-standard),
              opacity var(--duration-normal) var(--ease-standard);
}
.MobileNavToggle--open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.MobileNavToggle--open span:nth-child(2) { opacity: 0; }
.MobileNavToggle--open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile drawer */
@media (max-width: 1023.98px) {
  .SiteHeader__nav { display: none; }
  .MobileNavToggle { display: flex; }
}
@media (max-width: 768px) {
  .SiteHeader { height: 64px; }
  .SiteHeader__actions > .btn { display: none; }
}

/* ══════════════════════════════════════════════════════════════
   MegaMenu
   ══════════════════════════════════════════════════════════════ */
.SiteHeader__navItem--hasMenu > .SiteHeader__navLink { gap: 6px; }
.MegaMenu__trigger {
  background: none;
  border: 0;
  font: inherit;
  font-size: var(--text-nav, 15px);
  font-weight: var(--font-weight-medium, 500);
}
.SiteHeader__navChevron {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  transition: transform .18s ease-out;
}
.SiteHeader__navItem--hasMenu .MegaMenu__trigger[aria-expanded="true"] .SiteHeader__navChevron,
html:not(.nav-js) .SiteHeader__navItem--hasMenu:hover .SiteHeader__navChevron { transform: rotate(180deg); }

/* 浮层 */
.MegaMenu {
  position: absolute;
  top: 100%;
  left: 50%;
  z-index: 60;
  box-sizing: border-box;
  width: 430px;
  max-width: min(92vw, 600px);
  padding: 12px;
  margin-top: 12px;
  background: rgba(248, 249, 255, .94);
  border: 1px solid #E4E7F2;
  border-radius: 16px;
  box-shadow: 0 18px 50px rgba(15, 33, 76, .12);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  /* MegaMenu shift */
  transform: translateX(calc(-50% + var(--mega-shift, 0px))) translateY(-4px);
  /* 关闭动画 */
  transition: opacity .14s ease-out,
              transform .14s ease-out,
              visibility 0s linear .14s;
}
/* 2 列网格 */
.MegaMenu--grid2 { width: 520px; }
/* MegaMenu trigger gap */
.MegaMenu::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: -12px;
  height: 12px;
}
/* 打开状态：aria-expanded */
.SiteHeader__navItem--hasMenu .MegaMenu__trigger[aria-expanded="true"] + .MegaMenu,
html:not(.nav-js) .SiteHeader__navItem--hasMenu:hover > .MegaMenu,
html:not(.nav-js) .SiteHeader__navItem--hasMenu:focus-within > .MegaMenu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(calc(-50% + var(--mega-shift, 0px))) translateY(0);
  /* 打开动画 */
  transition: opacity .18s ease-out,
              transform .18s ease-out,
              visibility 0s;
}

.MegaMenu__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}
.MegaMenu__inner--single { grid-template-columns: minmax(0, 1fr); }
.MegaMenu__inner--grid2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.MegaMenu__group { display: flex; flex-direction: column; gap: 2px; }

/* ── 菜单项：默认透明，仅 hover/active 出现极浅底色 ── */
.MegaMenu__link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 60px;
  box-sizing: border-box;
  padding: 10px 12px;
  border-radius: 12px;
  background: transparent;
  color: #1F2329;
  text-decoration: none;
  transition: background .14s ease-out, color .14s ease-out;
}
.MegaMenu__link:hover,
.MegaMenu__link:focus-visible { background: #EEF1FF; }
.MegaMenu__link--active { background: #E9EDFF; }
.MegaMenu__link--active .MegaMenu__linkText { color: #0A3DFF; }

.MegaMenu__linkIcon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(10, 61, 255, .06);
  color: #3557A8;
}
.MegaMenu__linkIcon svg { width: 18px; height: 18px; display: block; }
.MegaMenu__linkIcon--dot { background: rgba(10, 61, 255, .06); }
.MegaMenu__linkIcon--dot > span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: .6;
}

.MegaMenu__linkBody { flex: 1 1 auto; min-width: 0; display: block; }
.MegaMenu__linkText {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: .01em;
}
.MegaMenu__linkDesc {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  margin-top: 3px;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.5;
  color: #5C6B84;
}
.MegaMenu__linkArrow {
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  color: #A9B2C4;
  opacity: .5;
  transform: translateX(0);
  transition: opacity .14s ease-out, transform .14s ease-out, color .14s ease-out;
}
.MegaMenu__link:hover .MegaMenu__linkArrow,
.MegaMenu__link:focus-visible .MegaMenu__linkArrow { opacity: 1; transform: translateX(2px); color: #0A3DFF; }

.MegaMenu__footerLink {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 44px;
  box-sizing: border-box;
  margin-top: 8px;
  padding: 6px 12px 0;
  border-top: 1px solid rgba(24, 45, 92, .06);
  font-size: 14px;
  font-weight: 500;
  color: #0A3DFF;
  text-decoration: none;
}
.MegaMenu__footerLink .MegaMenu__linkArrow { opacity: .6; color: currentColor; }
.MegaMenu__footerLink:hover .MegaMenu__linkArrow { opacity: 1; transform: translateX(2px); }
.MegaMenu__footerLink:hover { color: #0830D6; }

/* 深色主题：浮层改为高一层 surface，边框提高可见度，品牌蓝降低刺眼程度 */
html[data-theme="dark"] .MegaMenu {
  background: rgba(15, 29, 51, .95);
  border-color: rgba(153, 181, 226, .22);
  box-shadow: 0 22px 56px rgba(0, 0, 0, .42);
}
html[data-theme="dark"] .MegaMenu__link { color: #eef4ff; }
html[data-theme="dark"] .MegaMenu__link:hover,
html[data-theme="dark"] .MegaMenu__link:focus-visible { background: rgba(118, 168, 255, .12); }
html[data-theme="dark"] .MegaMenu__link--active { background: rgba(118, 168, 255, .16); }
html[data-theme="dark"] .MegaMenu__linkText { color: #eef4ff; }
html[data-theme="dark"] .MegaMenu__linkDesc { color: #a9b8cf; }
html[data-theme="dark"] .MegaMenu__linkIcon { background: rgba(118, 168, 255, .14); color: #9dc2ff; }
html[data-theme="dark"] .MegaMenu__link--active .MegaMenu__linkText,
html[data-theme="dark"] .MegaMenu__footerLink { color: #78b8ff; }
html[data-theme="dark"] .MegaMenu__footerLink { border-top-color: rgba(153, 181, 226, .18); }
html[data-theme="dark"] .MegaMenu__linkArrow { color: rgba(233, 240, 255, .35); }

/* ── MobileNav：一级 accordion（点击展开二级，二级直接跳转） ── */
.MobileNav__group { padding: 0; }
.MobileNav__group > summary { list-style: none; }
.MobileNav__group > summary::-webkit-details-marker { display: none; }
.MobileNav__group > summary svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform .2s cubic-bezier(.4, 0, .2, 1);
}
.MobileNav__group[open] > summary svg { transform: rotate(180deg); }
.MobileNav__sectionLabel--active { color: var(--color-primary, #0a3dff); }
.MobileNav__sectionLinks {
  display: none;
  flex-direction: column;
  padding: 0 16px 4px;
}
.MobileNav__group[open] .MobileNav__sectionLinks { display: flex; }
.MobileNav__sectionLinks a {
  padding: 10px 0;
  min-height: 44px;
  display: flex;
  align-items: center;
  font-size: 15px;
  color: var(--color-text-secondary, #3e4b60);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 45, 92, .05);
}
.MobileNav__sectionLinks a:last-child { border-bottom: 0; }
.MobileNav__sectionLinks a:hover { color: var(--color-text-primary, #1f2329); }
.MobileNav__sectionLink--active { color: var(--color-primary, #0a3dff) !important; font-weight: 500; }

/* 1024–1279：收紧一级菜单间距，保证 Logo + 导航 + CTA 始终单行 */
@media (min-width: 1024px) and (max-width: 1279px) {
  .SiteHeader__nav { gap: 0; }
  .SiteHeader__navLink { padding: 0 9px; font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .MobileNav,
  .MobileNavOverlay,
  .MobileNavToggle span,
  .MegaMenu,
  .SiteHeader__navChevron,
  .MegaMenu__linkArrow,
  .MobileNav__group > summary svg { transition: none; }
}