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.bp-proof{margin-top:16px;padding:18px}.bp-proof-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.bp-proof-head p{max-width:720px;margin:4px 0 0;color:var(--muted);line-height:1.55}.bp-proof-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:14px 0}.bp-proof-grid>div{border:1px solid var(--line);border-radius:14px;padding:12px;background:var(--soft);display:grid;gap:3px}.bp-proof-grid small{color:var(--muted)}.bp-proof-grid strong{font-size:1.05rem}.bp-proof-callout{border-left:4px solid #2f6f59;background:var(--soft);padding:12px 14px;border-radius:0 12px 12px 0;display:grid;gap:4px}.bp-proof-callout p{margin:0;color:var(--muted);line-height:1.55}.bp-proof-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.bp-history{margin-top:16px}.bp-history-head{display:flex;justify-content:space-between;gap:12px;align-items:end}.bp-history-list{display:grid;gap:8px;margin-top:10px}.bp-history-row{display:grid;grid-template-columns:1.3fr .8fr .8fr .8fr;gap:10px;border-top:1px solid var(--line);padding:10px 0;font-size:.88rem}.bp-history-row:first-child{border-top:0}.bp-history-row small{color:var(--muted)}
.bp-techniques{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin-top:14px}.bp-techniques article{border:1px solid var(--line);border-radius:14px;padding:12px;background:var(--card)}.bp-techniques h3{font-size:.9rem;margin:4px 0}.bp-techniques p{font-size:.8rem;line-height:1.45;color:var(--muted);margin:0}.bp-actions .btn.active{background:var(--text);color:var(--card)}
.bp-print-answer-note{display:none}
@media(max-width:900px){.bp-proof-grid{grid-template-columns:1fr 1fr}.bp-techniques{grid-template-columns:1fr 1fr}.bp-layout{grid-template-columns:minmax(0,1fr) 210px}}
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@media(max-width:390px){.bp-proof-grid{grid-template-columns:1fr}.bp-actions{grid-template-columns:1fr 1fr}.bp-board{min-width:var(--bp-min,300px)}}
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