:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
}
.site-header, .site-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(0,0,0,.1);
}
.site-footer { border-top: 1px solid rgba(0,0,0,.1); border-bottom: none; justify-content: center; }
.content { padding: 24px; max-width: 960px; margin: 0 auto; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card { border: 1px solid rgba(0,0,0,.1); border-radius: 8px; padding: 16px; }
.out { background: rgba(0,0,0,.06); padding: 12px; border-radius: 6px; overflow-x: auto; min-height: 64px; }
button { padding: 8px 12px; border-radius: 6px; border: 1px solid rgba(0,0,0,.2); cursor: pointer; }
input { padding: 8px 10px; border-radius: 6px; border: 1px solid rgba(0,0,0,.2); }