/* BabianLab — Resend-inspired docs style; 三栏布局，黑白灰为主，绿色 accent */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
:root{
  --bl-bg:#fff; --bl-fg:#0a0a0a; --bl-fg-soft:#525561; --bl-fg-mute:#8a8d99;
  --bl-border:#e9eaed; --bl-border-soft:#f1f2f5; --bl-bg-soft:#fafafa; --bl-bg-card:#fff;
  --bl-accent:#0a0a0a; --bl-link:#0a0a0a; --bl-mark:#10b981;
  --bl-h:60px; --bl-sb:264px; --bl-toc:240px;
}
.bl-body.is-dark{
  --bl-bg:#0a0a0a; --bl-fg:#f5f5f7; --bl-fg-soft:#a8acb8; --bl-fg-mute:#6b7080;
  --bl-border:#23252c; --bl-border-soft:#1a1c22; --bl-bg-soft:#0e1014; --bl-bg-card:#11141a;
  --bl-accent:#fff; --bl-link:#fff;
}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Inter,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;font-size:15px;line-height:1.65;color:var(--bl-fg);background:var(--bl-bg);-webkit-font-smoothing:antialiased}
a{color:var(--bl-link);text-decoration:none}
a:hover{text-decoration:underline}
kbd{display:inline-block;padding:2px 6px;border:1px solid var(--bl-border);border-radius:4px;font:inherit;font-size:11px;background:var(--bl-bg-soft);color:var(--bl-fg-soft)}
hr{border:0;border-top:1px solid var(--bl-border);margin:32px 0}
img{max-width:100%}

/* ── Top bar ───────────────────────────────────────── */
.bl-top{display:flex;align-items:center;justify-content:space-between;height:var(--bl-h);padding:0 24px;border-bottom:1px solid var(--bl-border);background:var(--bl-bg);position:sticky;top:0;z-index:30}
.bl-top__left{display:flex;align-items:center;gap:12px}
.bl-top__burger{display:none;width:32px;height:32px;border:0;background:transparent;color:var(--bl-fg);cursor:pointer;padding:0}
.bl-top__brand{display:flex;align-items:center;gap:10px;color:var(--bl-fg);font-weight:700;font-size:18px;letter-spacing:-.3px}
.bl-top__brand:hover{text-decoration:none}
.bl-top__nav{display:flex;align-items:center;gap:4px}
.bl-top__navlink{display:flex;align-items:center;gap:7px;padding:8px 14px;border-radius:6px;color:var(--bl-fg-soft);font-size:14px;font-weight:500}
.bl-top__navlink:hover{color:var(--bl-fg);background:var(--bl-bg-soft);text-decoration:none}
.bl-top__navlink.is-active{color:var(--bl-fg)}
.bl-top__navlink svg{flex-shrink:0;color:var(--bl-fg-mute)}
.bl-top__right{display:flex;align-items:center;gap:10px}
.bl-top__lang{display:flex;align-items:center;gap:0;border:1px solid var(--bl-border);border-radius:6px;padding:2px;background:var(--bl-bg-soft)}
.bl-top__lang a{padding:4px 8px;font-size:12px;color:var(--bl-fg-mute);border-radius:4px;font-weight:500}
.bl-top__lang a:hover{color:var(--bl-fg);text-decoration:none}
.bl-top__lang a.is-active{color:var(--bl-fg);background:var(--bl-bg-card);box-shadow:0 1px 2px rgba(0,0,0,.04)}
.bl-top__signin{padding:8px 14px;font-size:14px;font-weight:500;color:var(--bl-fg-soft)}
.bl-top__signin:hover{color:var(--bl-fg);text-decoration:none}
.bl-top__cta{padding:8px 14px;background:var(--bl-fg);color:var(--bl-bg);font-size:14px;font-weight:500;border-radius:6px}
.bl-top__cta:hover{opacity:.85;text-decoration:none}

/* ── Shell: three-column layout ────────────────────── */
.bl-shell{display:flex;align-items:flex-start;min-height:calc(100vh - var(--bl-h));max-width:1440px;margin:0 auto}
.bl-main{flex:1;min-width:0;padding:32px 48px 80px;max-width:none}

/* ── Sidebar ────────────────────────────────────────── */
.bl-sidebar{width:var(--bl-sb);flex-shrink:0;border-right:1px solid var(--bl-border);position:sticky;top:var(--bl-h);height:calc(100vh - var(--bl-h));overflow-y:auto;background:var(--bl-bg)}
.bl-sidebar__inner{padding:20px 16px}
.bl-sidebar__search{display:flex;gap:6px;margin-bottom:18px}
.bl-sidebar__search-btn{flex:1;display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--bl-border);border-radius:6px;background:var(--bl-bg-soft);color:var(--bl-fg-mute);font-size:13px;cursor:pointer}
.bl-sidebar__search-btn span{flex:1;text-align:left}
.bl-sidebar__search-btn kbd{font-size:10px;padding:1px 5px}
.bl-sidebar__ai{width:34px;border:1px solid var(--bl-border);border-radius:6px;background:var(--bl-bg-soft);color:var(--bl-fg);cursor:pointer;display:flex;align-items:center;justify-content:center}
.bl-sidebar__group{margin-bottom:22px}
.bl-sidebar__h{margin:0 0 6px;padding:6px 8px;font-size:13px;font-weight:600;color:var(--bl-fg);letter-spacing:.1px}
.bl-sidebar__list{list-style:none;padding:0;margin:0}
.bl-sidebar__list li{margin:0}
.bl-sidebar__list a{display:block;padding:6px 10px;border-radius:6px;color:var(--bl-fg-soft);font-size:14px;line-height:1.4}
.bl-sidebar__list a:hover{background:var(--bl-bg-soft);color:var(--bl-fg);text-decoration:none}
.bl-sidebar__list a.is-active{background:var(--bl-bg-soft);color:var(--bl-fg);font-weight:600}
.bl-sidebar__theme{position:sticky;bottom:0;padding:14px 0 6px;background:var(--bl-bg);border-top:1px solid var(--bl-border-soft);margin-top:24px}
.bl-sidebar__theme-btn{display:inline-flex;gap:8px;padding:6px 10px;border:1px solid var(--bl-border);border-radius:6px;background:var(--bl-bg-soft);color:var(--bl-fg-soft);cursor:pointer}
.bl-sidebar__theme-btn:hover{color:var(--bl-fg)}

/* ── Doc / Article core ─────────────────────────────── */
.bl-doc{max-width:780px}
.bl-post-layout{display:flex;gap:48px;align-items:flex-start}
.bl-post__body{flex:1;min-width:0;max-width:780px}
.bl-doc--post{max-width:none}
.bl-doc__crumb{font-size:13px;color:var(--bl-fg-mute);margin-bottom:14px;display:flex;align-items:center;flex-wrap:wrap;gap:6px}
.bl-doc__crumb a{color:var(--bl-fg-mute)}
.bl-doc__crumb a:hover{color:var(--bl-fg);text-decoration:none}
.bl-doc__crumb-current{color:var(--bl-fg)}
.bl-doc__crumb svg{flex-shrink:0;color:var(--bl-fg-mute)}
.bl-doc__h1{font-size:36px;line-height:1.2;font-weight:700;letter-spacing:-.6px;margin:0 0 14px;color:var(--bl-fg)}
.bl-doc__lede{font-size:17px;line-height:1.6;color:var(--bl-fg-soft);margin:0 0 32px;max-width:680px}
.bl-doc__meta{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;font-size:13px;color:var(--bl-fg-mute);padding-bottom:24px;border-bottom:1px solid var(--bl-border-soft);margin-bottom:32px}
.bl-doc__dot{color:var(--bl-fg-mute)}
.bl-doc__chip{padding:2px 9px;border:1px solid var(--bl-border);border-radius:999px;font-size:12px;color:var(--bl-fg-soft)}
.bl-doc__h2{font-size:24px;font-weight:700;letter-spacing:-.3px;margin:48px 0 14px;color:var(--bl-fg);padding-top:8px}

/* Body prose */
.bl-post__body h2,.bl-post__body h3,.bl-page__body h2,.bl-page__body h3{scroll-margin-top:80px;font-weight:700;letter-spacing:-.2px;color:var(--bl-fg)}
.bl-post__body h2,.bl-page__body h2{font-size:24px;margin:44px 0 14px;padding-top:8px}
.bl-post__body h3,.bl-page__body h3{font-size:18px;margin:32px 0 10px}
.bl-post__body p,.bl-page__body p{margin:0 0 16px}
.bl-post__body ul,.bl-post__body ol,.bl-page__body ul,.bl-page__body ol{padding-left:24px;margin:0 0 16px}
.bl-post__body li,.bl-page__body li{margin:6px 0}
.bl-post__body strong,.bl-page__body strong{font-weight:600;color:var(--bl-fg)}
.bl-post__body a,.bl-page__body a{color:var(--bl-fg);text-decoration:underline;text-underline-offset:2px;text-decoration-color:var(--bl-border)}
.bl-post__body a:hover,.bl-page__body a:hover{text-decoration-color:var(--bl-fg)}
.bl-post__body blockquote,.bl-page__body blockquote{margin:18px 0;padding:12px 18px;border-left:3px solid var(--bl-mark);background:var(--bl-bg-soft);border-radius:0 6px 6px 0;color:var(--bl-fg-soft)}
.bl-post__body table,.bl-page__body table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.bl-post__body th,.bl-post__body td,.bl-page__body th,.bl-page__body td{padding:9px 14px;border:1px solid var(--bl-border);text-align:left}
.bl-post__body th,.bl-page__body th{background:var(--bl-bg-soft);font-weight:600}
.bl-post__body code,.bl-page__body code{font-family:'SF Mono',Menlo,Consolas,monospace;font-size:.92em;padding:1.5px 6px;background:var(--bl-bg-soft);border:1px solid var(--bl-border-soft);border-radius:4px}
.bl-post__body pre,.bl-page__body pre{padding:16px 18px;background:var(--bl-bg-soft);border:1px solid var(--bl-border);border-radius:8px;overflow:auto;font-size:13px;line-height:1.6;margin:18px 0}
.bl-post__body pre code,.bl-page__body pre code{padding:0;background:transparent;border:0}

/* Anchored heading */
.bl-post__body h2 .bl-anchor,.bl-post__body h3 .bl-anchor{opacity:0;margin-left:8px;font-weight:400;color:var(--bl-fg-mute)}
.bl-post__body h2:hover .bl-anchor,.bl-post__body h3:hover .bl-anchor{opacity:1}

/* ── TOC (right) ────────────────────────────────────── */
.bl-toc{flex-shrink:0;width:var(--bl-toc);position:sticky;top:calc(var(--bl-h) + 32px);align-self:flex-start;padding-top:6px;font-size:13px}
.bl-toc__inner{padding-left:18px}
.bl-toc__head{display:flex;align-items:center;gap:8px;color:var(--bl-fg);font-weight:600;font-size:13px;margin-bottom:12px}
.bl-toc__head svg{color:var(--bl-fg-mute)}
.bl-toc__list{list-style:none;padding:0;margin:0;border-left:1px solid var(--bl-border);padding-left:14px}
.bl-toc__item{margin:8px 0}
.bl-toc__item--lv2 a{font-size:13px;color:var(--bl-fg)}
.bl-toc__item--lv3 a{font-size:13px;color:var(--bl-fg-soft);padding-left:14px;display:inline-block}
.bl-toc__item--lv4 a{font-size:12px;color:var(--bl-fg-mute);padding-left:28px;display:inline-block}
.bl-toc__list a:hover{text-decoration:none;color:var(--bl-fg)}

/* ── Card grid (homepage / quickstart / categories) ── */
.bl-section{margin:48px 0}
.bl-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0 6px}
.bl-card-grid--cols3{grid-template-columns:repeat(3,1fr)}
.bl-card{display:flex;flex-direction:column;gap:8px;padding:18px 20px;border:1px solid var(--bl-border);border-radius:10px;background:var(--bl-bg-card);color:var(--bl-fg);transition:border .15s}
.bl-card:hover{border-color:var(--bl-fg);text-decoration:none}
.bl-card__icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:8px;background:var(--bl-bg-soft);color:var(--bl-fg-soft);margin-bottom:4px}
.bl-card__title{font-weight:600;font-size:15px;color:var(--bl-fg)}
.bl-card__desc{font-size:13px;color:var(--bl-fg-soft);line-height:1.5}
.bl-card__count{font-size:12px;color:var(--bl-fg-mute);margin-top:6px}
.bl-card--soft{background:var(--bl-bg-soft);border-color:var(--bl-border-soft)}

/* ── Posts list ──────────────────────────────────────── */
.bl-list{list-style:none;padding:0;margin:18px 0}
.bl-list__item{padding:18px 0;border-bottom:1px solid var(--bl-border-soft)}
.bl-list__item:last-child{border-bottom:0}
.bl-list__meta{display:flex;gap:10px;align-items:center;margin-bottom:6px}
.bl-list__date{font-size:12px;color:var(--bl-fg-mute);font-variant-numeric:tabular-nums}
.bl-list__chip{font-size:12px;padding:2px 8px;background:var(--bl-bg-soft);border:1px solid var(--bl-border-soft);border-radius:999px;color:var(--bl-fg-soft)}
.bl-list__title{display:block;font-size:16px;font-weight:600;color:var(--bl-fg);margin:4px 0 6px}
.bl-list__title:hover{text-decoration:none;color:var(--bl-mark)}
.bl-list__desc{margin:0;font-size:14px;color:var(--bl-fg-soft);line-height:1.55;-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}
.bl-more{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-weight:500;color:var(--bl-fg)}

/* Pagination */
.bl-pager{display:flex;align-items:center;justify-content:center;gap:6px;margin:36px 0 0;flex-wrap:wrap}
.bl-pager__btn,.bl-pager__num{padding:6px 12px;border:1px solid var(--bl-border);border-radius:6px;font-size:13px;color:var(--bl-fg-soft);background:var(--bl-bg-card)}
.bl-pager__btn:hover,.bl-pager__num:hover{color:var(--bl-fg);border-color:var(--bl-fg);text-decoration:none}
.bl-pager__num.is-current{background:var(--bl-fg);color:var(--bl-bg);border-color:var(--bl-fg)}
.bl-pager__btn.is-disabled,.bl-pager__num.is-disabled{opacity:.4;cursor:not-allowed}

/* Prev/Next */
.bl-pn{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:48px 0 0;padding-top:32px;border-top:1px solid var(--bl-border-soft)}
.bl-pn>span{display:block}
.bl-pn__prev,.bl-pn__next{display:flex;flex-direction:column;gap:4px;padding:14px 18px;border:1px solid var(--bl-border);border-radius:10px;background:var(--bl-bg-card);color:var(--bl-fg)}
.bl-pn__next{text-align:right;align-items:flex-end}
.bl-pn__prev:hover,.bl-pn__next:hover{border-color:var(--bl-fg);text-decoration:none}
.bl-pn__lab{font-size:12px;color:var(--bl-fg-mute);display:flex;align-items:center;gap:4px}
.bl-pn__t{font-size:14px;font-weight:600;color:var(--bl-fg)}

/* FAQ */
.bl-faq{margin-top:14px;border-top:1px solid var(--bl-border-soft)}
.bl-faq__item{border-bottom:1px solid var(--bl-border-soft);padding:14px 4px}
.bl-faq__item summary{cursor:pointer;font-weight:600;font-size:15px;color:var(--bl-fg);list-style:none;display:flex;justify-content:space-between;align-items:center}
.bl-faq__item summary::-webkit-details-marker{display:none}
.bl-faq__item summary:after{content:'+';color:var(--bl-fg-mute);font-size:18px;font-weight:400}
.bl-faq__item[open] summary:after{content:'−'}
.bl-faq__a{margin-top:10px;font-size:14px;color:var(--bl-fg-soft);line-height:1.6}

/* Ask bar (footer above) */
.bl-ask{position:fixed;bottom:18px;right:24px;z-index:20;pointer-events:none}
.bl-ask__bar{display:flex;align-items:center;gap:8px;padding:8px 12px;background:var(--bl-bg-card);border:1px solid var(--bl-border);border-radius:999px;box-shadow:0 4px 16px rgba(0,0,0,.06);font-size:13px;color:var(--bl-fg-mute);min-width:280px;pointer-events:auto;cursor:pointer}
.bl-ask__icon{color:var(--bl-mark)}
.bl-ask__ph{flex:1}
.bl-ask__kb{font-size:11px}
.bl-ask__send{width:24px;height:24px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--bl-fg);color:var(--bl-bg)}

/* ── Footer ─────────────────────────────────────────── */
.bl-foot{border-top:1px solid var(--bl-border);padding:48px 24px 32px;background:var(--bl-bg-soft);margin-top:60px}
.bl-foot__inner{max-width:1280px;margin:0 auto;display:flex;justify-content:space-between;flex-wrap:wrap;gap:32px}
.bl-foot__brand{display:flex;flex-direction:column;gap:8px}
.bl-foot__brand-row{display:flex;align-items:center;gap:10px}
.bl-foot__logo{width:24px;height:24px}
.bl-foot__name{font-weight:700;font-size:16px}
.bl-foot__tag{font-size:13px;color:var(--bl-fg-mute)}
.bl-foot__cols{display:flex;gap:48px;flex-wrap:wrap}
.bl-foot__col h5{margin:0 0 12px;font-size:13px;font-weight:600;color:var(--bl-fg)}
.bl-foot__col ul{list-style:none;padding:0;margin:0}
.bl-foot__col li{margin:6px 0}
.bl-foot__col a{font-size:13px;color:var(--bl-fg-soft)}
.bl-foot__col a:hover{color:var(--bl-fg);text-decoration:none}
.bl-foot__bottom{max-width:1280px;margin:32px auto 0;padding-top:24px;border-top:1px solid var(--bl-border-soft)}
.bl-foot__risk{font-size:12px;color:var(--bl-fg-mute);margin:0 0 6px}
.bl-foot__copy{font-size:12px;color:var(--bl-fg-mute);margin:0}

.bl-link{color:var(--bl-fg);font-weight:500}

/* Mobile / responsive */
@media (max-width:1100px){
  .bl-toc{display:none}
  .bl-post-layout{display:block}
}
@media (max-width:880px){
  .bl-top__nav{display:none}
  .bl-top__burger{display:flex;align-items:center;justify-content:center}
  .bl-sidebar{position:fixed;top:var(--bl-h);left:0;height:calc(100vh - var(--bl-h));transform:translateX(-100%);transition:transform .25s;z-index:25;width:280px;box-shadow:0 0 18px rgba(0,0,0,.06)}
  .bl-sidebar.is-open{transform:translateX(0)}
  .bl-main{padding:24px 18px 60px}
  .bl-doc__h1{font-size:28px}
  .bl-doc__lede{font-size:16px}
  .bl-card-grid,.bl-card-grid--cols3{grid-template-columns:1fr}
  .bl-pn{grid-template-columns:1fr}
  .bl-top__lang{display:none}
  .bl-top__signin{display:none}
  .bl-foot__cols{gap:24px}
}