/* 预置首屏样式，避免主题闪烁（FOUC）。由 index.html 以 <link> 引入。 */
html[data-mode='light'] { background: #f7f9fc; }
html[data-mode='dark'] { background: #0b1020; }
#boot {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: #8b9ab5;
  font-size: 13px;
  z-index: 999;
  transition: opacity 0.3s ease;
}