/* 帮助中心：沿用已选定的并排编号版式；只由帮助页引入。 */
.help-center{--help-blue:#3180EC;--help-link:#205FB5;--help-line:#CFD5DC;--help-muted:#536071;--help-ink:#080A0E;color:var(--help-ink)}
.help-center *{box-sizing:border-box}
/* 新帮助标题在电脑也按词组排，避免「使用」等词被大字拆开。 */
.help-center .page-title .title-desktop-break{display:none}
.help-center .page-title .title-break{display:inline}
.help-center .page-title .title-word{display:inline;white-space:nowrap}
.help-center .page-title .title-line-break{display:block}
.help-center .help-shell{margin:58px auto 88px}
.help-center h1{font-family:var(--serif);font-weight:500;letter-spacing:-.035em;overflow-wrap:normal;word-break:normal;text-wrap:balance}
.help-center :lang(zh) h1{letter-spacing:-.02em}
.help-center .help-lede{max-width:38em;color:var(--help-muted);font-size:20px;line-height:1.65;margin:24px 0 0;text-wrap:pretty}
.help-center .help-index h1{font-size:88px;line-height:1.12;margin:0;max-width:510px}
.help-center .help-directory{display:grid;margin:0;border-top:1px solid var(--help-ink)}
.help-center .help-directory a{display:grid;grid-template-columns:68px 1fr 24px;gap:24px;align-items:center;color:var(--help-ink);padding:34px 0;border-bottom:1px solid var(--help-line)}
.help-center .help-directory .help-label{font:500 27px/1.35 var(--serif);text-wrap:balance}
.help-center .help-arrow{display:block;width:20px;height:20px;position:relative;justify-self:end}
.help-center .help-arrow:before{content:"";position:absolute;width:18px;height:1px;background:currentColor;top:10px;left:0}
.help-center .help-arrow:after{content:"";position:absolute;right:1px;top:5px;width:9px;height:9px;border-top:1px solid;border-right:1px solid;transform:rotate(45deg)}
.help-center .help-directory a:hover .help-label,.help-center .help-rail a:hover{color:var(--help-link)}
.help-center a:focus-visible{outline:2px solid var(--help-link);outline-offset:6px;border-radius:2px}
.help-center .help-contact{padding-top:28px;margin-top:40px;border-top:1px solid var(--help-line);font-size:14px;color:var(--help-muted);line-height:1.8}
.help-center .help-contact a,.help-center .help-prose a{color:var(--help-link);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.help-center .help-reader{display:grid;grid-template-columns:240px minmax(0,1fr);column-gap:72px;align-items:start}
.help-center .help-rail{position:sticky;top:32px;padding-top:25px;border-top:5px solid var(--help-blue)}
.help-center .help-rail-home{display:inline-block;color:var(--help-ink);font-weight:600;font-size:16px;line-height:1.45;margin-bottom:26px}
.help-center .help-rail nav{display:grid;border-top:1px solid var(--help-line)}
.help-center .help-rail nav a{padding:15px 0;border-bottom:1px solid var(--help-line);font-size:14px;color:var(--help-muted);line-height:1.55}
.help-center .help-rail nav [aria-current=page]{color:var(--help-link);font-weight:600}
.help-center .help-reading{max-width:740px;min-width:0}
.help-center .help-reading>header{padding-bottom:32px;border-bottom:1px solid var(--help-blue);margin-bottom:32px}
.help-center .help-chapter{display:inline-flex;align-items:center;border:1px solid var(--help-ink);border-radius:999px;padding:8px 13px;color:#fff;font:500 13px/1 var(--sans);margin-bottom:24px;font-variant-numeric:tabular-nums;background:var(--help-ink)}
.help-center .help-reading h1{font-size:52px;line-height:1.18;margin:0}
.help-center .help-prose{font-size:17px;line-height:1.85;overflow-wrap:anywhere}
.help-center .help-prose p{margin:0 0 22px;text-wrap:pretty}
.help-center .help-prose h2{font:600 20px/1.5 var(--sans);letter-spacing:0;margin:36px 0 16px;text-wrap:wrap}
.help-center .help-prose ol{list-style:none;counter-reset:help-step;padding:0;margin:0 0 34px}
.help-center .help-prose li{position:relative;counter-increment:help-step;margin:0;padding:20px 0 20px 52px;border-bottom:1px solid var(--help-line)}
.help-center .help-prose li:first-child{padding-top:0}
.help-center .help-prose li:before{content:counter(help-step,decimal-leading-zero);position:absolute;left:0;top:21px;color:var(--help-blue);font:500 25px/1 var(--serif);font-variant-numeric:tabular-nums}
.help-center .help-prose li:first-child:before{top:3px}
.help-center .help-prose [id]{scroll-margin-top:28px}
/* 大标题与纵向目录并排，数字作为导航入口。 */
.help-center .help-index{display:grid;grid-template-columns:1fr 1.15fr;gap:0 90px;align-items:start}
.help-center .help-index>header{padding-top:26px;border-top:5px solid var(--help-blue)}
.help-center .help-index .help-lede{font-size:19px;max-width:300px;margin-top:32px}
.help-center .help-directory .help-number{font:500 48px/1 var(--serif);font-variant-numeric:tabular-nums;color:var(--help-blue)}
.help-center .help-index .help-contact{grid-column:1/-1}
@media(max-width:960px){
 .help-center .help-shell{margin-top:36px}
 .help-center .help-reader{grid-template-columns:190px minmax(0,1fr);column-gap:38px}
 .help-center .help-index h1{font-size:64px}
 .help-center .help-reading h1{font-size:44px}
 .help-center .help-index{column-gap:48px}
}
@media(max-width:680px){
 .help-center .help-shell{margin:30px auto 56px}
 .help-center .help-index,.help-center .help-reader{display:block}
 .help-center .help-index>header{display:block;padding-top:24px}
 .help-center .help-index h1{font-size:48px;line-height:1.2}
 .help-center .help-index .help-lede{font-size:16px;line-height:1.7;margin-top:20px;max-width:28em}
 .help-center .help-directory{margin-top:32px}
 .help-center .help-directory a{grid-template-columns:54px 1fr 20px;gap:16px;padding:27px 0}
 .help-center .help-directory .help-label{font-size:23px;line-height:1.45}
 .help-center .help-contact{font-size:13px;margin-top:30px;padding-top:22px}
 .help-center .help-rail{position:static;padding:0;border:0;margin-bottom:32px}
 .help-center .help-rail-home{margin-bottom:18px;font-size:14px}
 .help-center .help-rail nav{grid-template-columns:1fr 1fr;gap:0 20px}
 .help-center .help-rail nav a{font-size:13px;padding:10px 0}
 .help-center .help-reading h1{font-size:38px;line-height:1.25}
 .help-center .help-reading>header{padding-bottom:26px;margin-bottom:26px}
 .help-center .help-prose{font-size:16px;line-height:1.85}
 .help-center .help-prose h2{font-size:19px;margin-top:30px}
 .help-center .help-prose li{padding:18px 0 18px 40px}
 .help-center .help-chapter{margin-bottom:18px}
 .help-center .help-directory .help-number{font-size:39px}
}
@media(max-width:460px){
 .help-center .title-word{white-space:nowrap}
 .help-center .help-reading h1{font-size:38px}
 .help-center .help-index:lang(zh) h1{font-size:38px}
}
@media(max-width:359px){
 .help-center .help-index:lang(zh) h1,.help-center .help-reading:lang(zh) h1{font-size:31.666667px}
 .help-center .help-directory .help-label{font-size:21px}
}