/* =========================================================
   基础样式：重置、排版、通用工具类
   ========================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page-bg);
  color: var(--page-text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 20px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--page-text);
}

a:hover {
  color: var(--page-strong);
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

:focus-visible {
  outline: 2px solid var(--page-focus);
  outline-offset: 2px;
}

/* 仅供读屏软件 */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 跟随主题显示的文案 */
:root[data-theme="light"] .only-dark,
:root:not([data-theme="light"]) .only-light {
  display: none !important;
}

/* 主题切换时的交叉淡入（View Transitions API） */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.28s;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}