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16px);padding:2px 10px;border-radius:999px;background:rgba(0,0,0,.45);color:#fff;font-size:11px;line-height:1.6;pointer-events:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.b2-kb-post-cover-empty{display:flex;align-items:center;justify-content:center}.b2-kb-post-letter{font-size:28px;font-weight:600;color:rgba(255,255,255,.9)}.b2-kb-post-info{padding:12px}.b2-kb-post-title{font-size:14px;font-weight:500;color:#18191c;line-height:1.5;display:-webkit-box;-webkit-line-clamp:var(--title-row,2);-webkit-box-orient:vertical;overflow:hidden;min-height:calc(21px * var(--title-row, 2))}.b2-kb-post-custom{margin-top:6px;font-size:12px;color:#4a4f5e;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.b2-kb-post-custom span{color:#8890a7;margin-right:4px}.b2-kb-post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px;margin-top:8px;color:#8890a7;font-size:12px}.b2-kb-post-meta-item{display:inline-flex;align-items:center;gap:3px}.b2-kb-post-meta-item .b2font{font-size:13px}.b2-kb-post-list{display:flex;align-items:stretch}.b2-kb-post-list .b2-kb-post-cover{width:var(--thumb-w,190px);height:auto;aspect-ratio:var(--thumb-r,1/0.74);flex-shrink:0}.b2-kb-post-list .b2-kb-post-info{flex:1;min-width:0;display:flex;flex-direction:column;justify-content:center}.b2-kb-loadmore{margin:20px auto 0;width:160px;text-align:center;padding:10px 0;background:#fafbfc;border:1px solid #e5e7eb;border-radius:8px;color:#4a4f5e;font-size:14px;cursor:pointer;transition:background .15s,color .15s}.b2-kb-loadmore:hover{background:#03a9f4;border-color:#03a9f4;color:#fff}.b2-kb-loadmore.loading{opacity:.6;pointer-events:none}.b2-kb-loadmore.nomore{display:none !important}.b2-kb-posts-empty{grid-column:1/-1;padding:60px 20px;text-align:center;color:#8890a7;font-size:14px}@media (max-width:1400px){.b2-kb-posts{grid-template-columns:repeat(3,1fr)}}@media (max-width:1200px){.b2-kb-posts{grid-template-columns:repeat(2,1fr)}}@media (max-width:768px){.b2-kb-wrap{padding:12px}.b2-kb-body{flex-direction:column;gap:12px}.b2-kb-tree{width:100%;position:static;left:auto;max-height:none;overflow-x:auto;overflow-y:hidden;padding:8px;display:flex;gap:6px;flex-wrap:nowrap}.b2-kb-main{margin-left:0}.b2-kb-tree-title{display:none}.b2-kb-tree-list,.b2-kb-tree-group{display:contents}.b2-kb-tree-group-name{display:none}.b2-kb-tree-children{display:contents}.b2-kb-tree-item{flex-shrink:0;padding:6px 12px;white-space:nowrap;background:#fafbfc;border:1px solid #f0f1f3}.b2-kb-tree-item .b2-kb-tree-count{display:none}.b2-kb-posts{grid-template-columns:repeat(2,1fr);gap:10px}.b2-kb-post-title{-webkit-line-clamp:var(--title-row-m,2);min-height:calc(21px * var(--title-row-m, 2))}.b2-kb-post-list{grid-column:1/-1}.b2-kb-post-list .b2-kb-post-cover{width:var(--thumb-wm,100px);aspect-ratio:var(--thumb-rm,1/0.6)}}