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var(--line)}.bc-tree>.bc-node:last-child,.bc-tree>.bc-node.last{border-bottom:none}.bc-row{align-items:center;gap:13px;padding:10px 0;display:flex}.bc-c-num{min-width:42px;font-family:var(--font-mono);color:var(--plum);flex:none;font-size:12.5px;font-weight:700}.bc-c-name{min-width:0;color:var(--plum);flex:1;font-family:Noto Serif Bengali,serif;font-size:15.5px;font-weight:700;line-height:1.35}.bc-c-tags{flex:none;align-items:center;gap:8px;display:flex}.bc-qbadge{cursor:pointer;background:var(--accent-soft);height:22px;color:var(--accent-deep);font-family:var(--font-mono);border:none;border-radius:6px;align-items:center;padding:0 9px;font-size:11px;font-weight:700;display:inline-flex}.bc-qbadge:hover{background:color-mix(in srgb, var(--accent) 22%, var(--surface))}.bc-page{cursor:pointer;min-width:64px;font-family:var(--font-mono);color:var(--ink-faint);background:0 0;border:none;justify-content:flex-end;align-items:center;gap:5px;font-size:12px;display:inline-flex}.bc-page:hover{color:var(--accent-deep)}.bc-kids{border-left:1.5px solid var(--line);margin:0 0 4px 20px;padding-left:18px}.bc-node.sub .bc-c-num{color:var(--ink-faint);font-size:11.5px;font-weight:600}.bc-node.sub .bc-c-name{color:var(--ink);font-size:14px;font-weight:500}.bc-node.sub>.bc-row{padding:8px 0}.bc-ex{flex-direction:column;gap:12px;margin-top:20px;display:flex}.bc-ex-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.bc-filter{color:var(--ink-secondary);margin:0;font-size:13.5px}.bc-ex-list{background:var(--surface);box-shadow:var(--shadow-md);border-radius:16px;margin:0;padding:0 20px;list-style:none}.bc-ex-list>li{border-bottom:1px solid var(--line)}.bc-ex-list>li:last-child{border-bottom:none}.bc-ex-row{color:var(--ink);align-items:center;gap:14px;padding:14px 0;text-decoration:none;display:flex}.bc-tag{min-width:78px;height:24px;font-family:var(--font-mono);letter-spacing:.03em;border-radius:6px;flex:none;place-items:center;padding:0 10px;font-size:10.5px;font-weight:700;display:inline-grid}.bc-tag--creative{background:var(--plum-soft);color:var(--plum)}.bc-tag--mcq{background:var(--accent-soft);color:var(--accent-deep)}.bc-tag--short{background:var(--teal-soft);color:color-mix(in srgb, var(--teal-deep) 70%, var(--ink))}.bc-ex-main{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.bc-ex-stem{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;font-family:Noto Serif Bengali,serif;font-size:14.5px;font-weight:600;line-height:1.4;display:block;overflow:hidden}.bc-ex-concept{font-family:var(--font-mono);color:var(--ink-faint);font-size:11px}.bc-ex-open{color:var(--accent-deep);flex:none;align-items:center;gap:4px;font-size:12.5px;font-weight:700;display:inline-flex}.bc-ex-row:hover .bc-ex-stem{color:var(--accent-deep)}@media (width<=720px){.bc-num{width:54px;height:54px;font-size:24px}.bc-title{font-size:22px}.bc-acts{width:100%}.bc-tree,.bc-ex-list{padding-left:14px;padding-right:14px}.bc-tabs button{margin-right:18px}}