.bk-section{padding:56px 0 96px;background:var(--surface-alt)}.bk-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}@media(max-width:1024px){.bk-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:720px){.bk-grid{grid-template-columns:repeat(2,1fr);gap:14px}}@media(max-width:440px){.bk-grid{grid-template-columns:1fr}}.bk-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;display:flex;flex-direction:column;transition:transform var(--dur) var(--ease),border-color var(--dur),box-shadow var(--dur)}.bk-card:hover{transform:translateY(-4px);border-color:var(--brand-tint-strong);box-shadow:var(--shadow-md)}.bk-cover{aspect-ratio:2/3;background:linear-gradient(135deg,var(--slate-100),var(--slate-200));overflow:hidden;display:flex;align-items:center;justify-content:center}.bk-cover img{width:100%;height:100%;object-fit:contain;background:#fff;transition:transform var(--dur-slow) ease;padding:8px}.bk-card:hover .bk-cover img{transform:scale(1.03)}.bk-cover-ph svg{width:44px;height:44px;color:var(--brand);opacity:.5;stroke-width:1.4}.bk-body{padding:16px 18px 12px;flex:1}.bk-title{font-size:15px;font-weight:600;line-height:1.3;color:var(--text);margin-bottom:4px;letter-spacing:-.015em;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.bk-sub{font-size:12.5px;color:var(--text-muted);display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}.bk-footer{padding:12px 18px 16px;border-top:1px solid var(--border);display:flex;align-items:center;gap:10px}.bk-author{display:inline-flex;align-items:center;gap:8px;text-decoration:none;color:var(--text-secondary);min-width:0;flex:1;font-size:12px;font-weight:500;transition:color var(--dur)}.bk-author img,.bk-author .bk-avatar{width:26px;height:26px;border-radius:50%;flex-shrink:0}.bk-author img{object-fit:cover}.bk-avatar{background:var(--brand);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:600}.bk-author span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bk-author:hover{color:var(--brand)}.bk-buy{display:inline-flex;align-items:center;gap:5px;padding:6px 12px;border-radius:var(--r);background:var(--brand);color:#fff;font-size:11.5px;font-weight:600;text-decoration:none;flex-shrink:0;transition:all var(--dur);box-shadow:var(--shadow-brand)}.bk-buy:hover{transform:translateY(-1px);background:var(--brand-hover);box-shadow:var(--shadow-brand-lg)}.bk-buy svg{width:11px;height:11px}