#ls-custom-tooltip {
      display: none;
      position: fixed;
      z-index: 99999;
      pointer-events: none;
      max-width: 220px;
      padding: 6px 10px;
      background: var(--color-accent);
      color: var(--color-accent-text);
      font-family: 'Space Grotesk', monospace;
      font-size: 12px;
      line-height: 1.45;
      border-radius: 6px;
      box-shadow: 0 4px 16px rgba(0,0,0,0.25);
    }

    /* ── 路线选择按钮：主题感知覆盖规─────────────────────────────────────
       写在 index.html 而非页面片段，完全绕patchCssText 处理机制       通过 html[data-theme] 属性选择器精确匹配，高优先级保证生效    ──────────────────────────────────────────────────────────────────────── */

    /* 暗黑主题：绿底黑*/
    html:not([data-theme="light"]) .igb-route-btn.igb-route-active,
    html:not([data-theme="light"]) .ige-route-btn.ige-route-active,
    html:not([data-theme="light"]) .igp-route-btn.igp-route-active,
    html:not([data-theme="light"]) .igo-route-btn.igo-route-active {
      background: #d4ff00 !important;
      color: #000000 !important;
      border-color: #d4ff00 !important;
    }

    /* 日光主题：蓝底白*/
    html[data-theme="light"] .igb-route-btn.igb-route-active,
    html[data-theme="light"] .ige-route-btn.ige-route-active,
    html[data-theme="light"] .igp-route-btn.igp-route-active,
    html[data-theme="light"] .igo-route-btn.igo-route-active {
      background: #0066ff !important;
      color: #ffffff !important;
      border-color: #0066ff !important;
    }

    /* 日光主题：非激活按钮默认*/
    html[data-theme="light"] .igb-route-btn,
    html[data-theme="light"] .ige-route-btn,
    html[data-theme="light"] .igp-route-btn,
    html[data-theme="light"] .igo-route-btn {
      color: rgba(10,22,40,0.50) !important;
      border-color: rgba(0,80,200,0.22) !important;
      background: transparent !important;
    }

    /* 日光主题：hover */
    html[data-theme="light"] .igb-route-btn:hover,
    html[data-theme="light"] .ige-route-btn:hover,
    html[data-theme="light"] .igp-route-btn:hover,
    html[data-theme="light"] .igo-route-btn:hover {
      border-color: rgba(0,102,255,0.55) !important;
      color: rgba(10,22,40,0.80) !important;
    }