/* ==================== 顶部导航栏样式 ==================== */
#user-auth-nav {
  position: fixed; top: 0; left: 0; width: 100%;
  background: #fff;
  border-bottom: 1px solid #e8e8e8;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  z-index: 900; padding: 0;
  font-family: "Segoe UI","Microsoft YaHei",sans-serif;
  font-size: 13px; color: #333;
  box-sizing: border-box;
}
#user-auth-nav *,
#user-auth-nav *::before,
#user-auth-nav *::after { box-sizing: border-box; }
.ua-nav-inner {
  display: flex; align-items: center;
  justify-content: space-between;
  max-width: 1200px; margin: 0 auto;
  padding: 7px 20px;
}
.ua-nav-links {
  display: flex; align-items: center; flex-wrap: wrap;
  list-style: none; margin: 0; padding: 0;
}
.ua-nav-links li { display: inline-flex; align-items: center; }
.ua-nav-links a {
  color: #3498db; text-decoration: none; font-size: 13px;
  padding: 2px 8px; white-space: nowrap;
  transition: color 0.3s ease;
}
.ua-nav-links a:hover { color: #2c3e50; text-decoration: underline; }
.ua-nav-links a.active { color: #2c3e50; font-weight: 600; cursor: default; text-decoration: none; }
.ua-nav-sep {
  color: #bdc3c7; user-select: none; font-size: 12px; margin: 0 2px;
}
.ua-nav-account { flex-shrink: 0; margin-left: 16px; }
/* 页面顶部留白，防止被固定导航栏遮挡（导航栏实际高度约44px + 11px缓冲） */
html body { padding-top: 55px; }
/* 响应式 */
@media (max-width: 600px) {
  #user-auth-nav a { font-size: 11px; padding: 2px 4px; }
  #user-auth-nav .ua-nav-sep { margin: 0 1px; }
  .ua-nav-inner { padding: 7px 10px; }
}