/* 顶栏：白底 + 蓝点缀，对齐智凌风格 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}
.site-header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.site-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.08rem;
  color: #111827;
  text-decoration: none;
  flex-shrink: 0;
}
.site-brand:hover { text-decoration: none; color: #111827; }
.site-brand-badge {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #2f6bff;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  box-shadow: none;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #4b5563;
  font-size: 0.94rem;
}
.site-nav a {
  position: relative;
  color: #4b5563;
  text-decoration: none;
  white-space: nowrap;
  padding: 4px 0;
  transition: color 0.15s;
}
.site-nav a:hover,
.site-nav a.active {
  color: #2f6bff;
  text-decoration: none;
}
.site-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: #2f6bff;
}
.site-header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}
.site-header-actions a.site-btn-login,
a.site-btn-login {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  border: 1px solid #d1d5db !important;
  background: #fff !important;
  color: #374151 !important;
  padding: 7px 14px !important;
  border-radius: 8px !important;
  font-weight: 600 !important;
  font-size: 0.9rem !important;
  line-height: 1.2 !important;
  text-decoration: none !important;
  box-shadow: none !important;
}
.site-header-actions a.site-btn-login:hover,
a.site-btn-login:hover {
  border-color: #2f6bff !important;
  color: #2f6bff !important;
  background: #eff4ff !important;
  box-shadow: none !important;
  transform: none;
  text-decoration: none !important;
}
.site-header-actions a.site-btn-login.active,
a.site-btn-login.active {
  background: #2f6bff !important;
  color: #fff !important;
  border-color: #2f6bff !important;
}
.site-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #2f6bff;
  color: #fff !important;
  padding: 7px 16px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none !important;
  box-shadow: none;
}
.site-btn-primary:hover {
  background: #1f54d9;
  transform: none;
  box-shadow: none;
  color: #fff !important;
  text-decoration: none !important;
}
.site-btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #e5e7eb;
  background: #fff;
  color: #374151 !important;
  padding: 7px 12px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none !important;
}
.site-btn-outline:hover {
  border-color: #2f6bff;
  color: #2f6bff !important;
  text-decoration: none !important;
}
@media (max-width: 960px) {
  .site-nav { display: none; }
  .site-header-inner { padding: 0 16px; height: 56px; gap: 10px; }
  .site-btn-outline { display: none; }
  .site-header-actions a.site-btn-login,
  a.site-btn-login { padding: 6px 10px !important; font-size: 0.86rem !important; }
  .site-btn-primary { padding: 6px 12px; }
}