/* ========================================
   SiteHeader — 薪连薪官网
   受控重构：统一版心、菜单、Logo
   ======================================== */

/* ── Header Core ── */
.SiteHeader {
  --header-container-main: min(72vw, 1280px);
  --header-padding-inline: clamp(24px, 2.5vw, 48px);
  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);
  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;
}

/* ── 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); }

@media (max-width: 1024px) {
  .SiteHeader__nav { display: none; }
  .MobileNavToggle { display: flex; }
}
@media (max-width: 768px) {
  .SiteHeader { height: 64px; }
  .SiteHeader__actions > .btn { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .MobileNav,
  .MobileNavOverlay,
  .MobileNavToggle span { transition: none; }
}