* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  transition: background .3s ease, color .3s ease;
}
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; }
button, input, select, textarea { font: inherit; }
:focus-visible { outline: 3px solid rgba(37, 99, 235, .28); outline-offset: 2px; }
.screen-reader-text { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }