:root{--fg:#2f3437;--muted:#787774;--bg:#fff;--line:#e9e9e7;--link:#1a6dc3;--code-bg:#f7f6f3}
@media (prefers-color-scheme:dark){:root{--fg:#e6e6e4;--muted:#9b9b98;--bg:#191919;--line:#2f2f2f;--link:#6fb2f0;--code-bg:#252525}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);
 font:17px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
 -webkit-text-size-adjust:100%}
main,.top,footer{max-width:44rem;margin:0 auto;padding:0 1.25rem}
.top{padding-top:1.5rem}
.crumb{font-size:.85rem;color:var(--muted)}
.crumb a{color:var(--muted);text-decoration:none}
.crumb a:hover{text-decoration:underline}
.crumb .sep{margin:0 .45em;opacity:.5}
h1{font-size:1.9rem;line-height:1.3;margin:1.2rem 0 1.6rem;letter-spacing:-.01em}
h2{font-size:1.35rem;margin:2.2rem 0 .6rem}
h3{font-size:1.15rem;margin:1.8rem 0 .5rem}
h4,h5{font-size:1rem;margin:1.4rem 0 .4rem}
p{margin:.85rem 0}
a{color:var(--link)}
ul,ol{padding-left:1.4rem}
li{margin:.35rem 0}
blockquote{margin:1.2rem 0;padding:.2rem 0 .2rem 1rem;border-left:3px solid var(--line);color:var(--muted)}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0}
figure{margin:1.6rem 0}
img{max-width:100%;height:auto;border-radius:4px;display:block}
figcaption{font-size:.85rem;color:var(--muted);margin-top:.5rem}
code{background:var(--code-bg);padding:.15em .35em;border-radius:3px;font-size:.9em}
pre.code{background:var(--code-bg);padding:1rem;border-radius:6px;overflow-x:auto}
pre.code code{background:none;padding:0}
.table-wrap{overflow-x:auto;margin:1.4rem 0}
table{border-collapse:collapse;width:100%}
td{border:1px solid var(--line);padding:.5rem .7rem}
.columns{display:flex;gap:1.5rem;flex-wrap:wrap}
.columns .col{flex:1 1 14rem;min-width:0}
.callout{background:var(--code-bg);border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}
.children{margin:3rem 0 1rem;border-top:1px solid var(--line);padding-top:1.5rem}
.children ul{list-style:none;padding:0}
.children li{margin:.1rem 0}
.children a{display:block;padding:.55rem .75rem;border-radius:5px;text-decoration:none;color:var(--fg)}
.children a:hover{background:var(--code-bg)}
.missing{color:#c0392b;font-size:.9rem}
audio{width:100%;margin:1rem 0}
footer{margin:4rem auto 3rem;padding-top:1.5rem;border-top:1px solid var(--line);
 font-size:.82rem;color:var(--muted)}
footer a{color:var(--muted)}
.hl-red,.hl-red_background{color:#c0392b}
.hl-blue,.hl-blue_background{color:#1a6dc3}
.hl-yellow_background{background:rgba(255,212,0,.25)}
.hl-gray,.hl-gray_background{color:var(--muted)}