:root{--font-sans:system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Oxygen-Sans,
    Ubuntu,
    Cantarell,
    "Helvetica Neue",
    Helvetica,
    Arial,
    "PingFang SC",
    "Hiragino Sans GB",
    "STXihei",
    "华文细黑",
    "Microsoft YaHei",
    "微软雅黑",
    SimSun,
    "宋体",
    Heiti,
    "黑体",
    sans-serif;--font-mono:SFMono-Regular,
    "SF Mono",
    Menlo,
    Consolas,
    "Liberation Mono",
    monospace}html{font-family:var(--font-sans)}code,pre,kbd,samp{font-family:var(--font-mono)}