:root{--color-brand:#000;--color-ink:#1a1a1a;--color-muted:#666;--color-bg:#fff;--color-line:#e0e0e0;--font-body:system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--font-display:var(--font-body);--space-xs:0.5rem;--space-sm:1rem;--space-md:2rem;--space-lg:4rem;--space-xl:8rem;--measure:68ch;--container:72rem}*,*::before,*::after{box-sizing:border-box}body{margin:0;font-family:var(--font-body);color:var(--color-ink);background:var(--color-bg)}img,svg{max-width:100%;height:auto;display:block}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:var(--space-sm);top:var(--space-sm);z-index:100;padding:var(--space-xs)var(--space-sm);background:var(--color-bg);outline:2px solid var(--color-brand)}