#b2-article-toc-root{--b2toc-active-bg:#f2f6ff;--b2toc-active-color:#06f;--b2toc-line:#d8dee8;position:fixed;z-index:80;top:110px;width:210px;max-height:calc(100vh - 150px);font-size:13px;line-height:1.45;color:#7b8492}#b2-article-toc-root.is-hidden{display:none!important}.b2toc-panel{position:relative;max-height:inherit;padding-left:16px}.b2toc-panel:before{content:"";position:absolute;left:0;top:2px;bottom:2px;width:1px;background:var(--b2toc-line)}.b2toc-title{margin:0 0 10px;color:#2c3442;font-size:14px;font-weight:700;letter-spacing:.02em}.b2toc-list{max-height:calc(100vh - 200px);margin:0;padding:0;overflow:auto;list-style:none;scrollbar-width:none}.b2toc-list::-webkit-scrollbar{display:none}.b2toc-item{margin:0;padding:0}.b2toc-link{display:block;padding:5px 9px;border-radius:5px;color:#7b8492!important;text-decoration:none!important;white-space:normal;word-break:break-word;transition:background .15s ease,color .15s ease}.b2toc-item.level-h2 .b2toc-link{margin-bottom:2px;font-size:13px}.b2toc-item.level-h3 .b2toc-link{padding:4px 9px 4px 18px;margin-bottom:1px;color:#9299a4!important;font-size:12px}.b2toc-link:hover{color:#06f!important;background:#f7f9fc}.b2toc-item.is-active .b2toc-link{background:var(--b2toc-active-bg);color:var(--b2toc-active-color)!important;font-weight:600}.b2toc-item.is-active.level-h3 .b2toc-link{color:var(--b2toc-active-color)!important}.b2toc-mobile-button{position:fixed;right:18px;bottom:88px;z-index:99990;display:none;align-items:center;justify-content:center;height:38px;padding:0 14px;border:0;border-radius:999px;background:#2f6fed;color:#fff;box-shadow:0 8px 26px rgba(0,0,0,.22);font-size:13px;cursor:pointer}.b2toc-mobile-mask{position:fixed;inset:0;z-index:99991;display:none;background:rgba(0,0,0,.4)}.b2toc-mobile-drawer{position:fixed;z-index:99992;left:0;right:0;bottom:0;display:none;max-height:72vh;padding:18px 18px 24px;overflow:auto;border-radius:16px 16px 0 0;background:#fff;color:#697386;box-shadow:0 -16px 50px rgba(0,0,0,.25)}.b2toc-mobile-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;color:#252b36;font-size:16px;font-weight:700}.b2toc-mobile-close{width:32px;height:32px;border:0;border-radius:50%;background:#f1f4f8;color:#4d5968;font-size:20px;cursor:pointer}body.b2toc-mobile-open{overflow:hidden}body.b2toc-mobile-open .b2toc-mobile-mask,body.b2toc-mobile-open .b2toc-mobile-drawer{display:block}