.bi-hero{background:linear-gradient(135deg,#0f2d6e 0%,#1a56db 60%,#1971c2 100%);color:#fff;padding:56px 0}.bi-hero .container{max-width:1100px}.bi-bc{font-size:0.86rem;color:rgba(255,255,255,0.82);margin-bottom:12px}.bi-bc a{color:inherit;text-decoration:none}.bi-hero h1{color:#fff;font-size:2.1rem;font-weight:700;line-height:1.2;margin:0 0 10px;letter-spacing:-0.4px}.bi-hero p{font-size:1.02rem;line-height:1.55;max-width:760px;color:rgba(255,255,255,0.94);margin:0}.bi-body{background:#f5f7fa;padding:48px 0 64px}.bi-body .container{max-width:1100px}.bi-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:22px}.bi-card{display:flex;flex-direction:column;background:#fff;border-radius:14px;overflow:hidden;border:1px solid #e2e8f0;text-decoration:none;color:inherit;transition:transform 0.18s,box-shadow 0.18s,border-color 0.18s}.bi-card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(15,23,42,0.08);border-color:#93c5fd;text-decoration:none}.bi-card .bi-thumb{width:100%;aspect-ratio:16 / 9;background:linear-gradient(135deg,#1a56db,#6366f1);overflow:hidden;position:relative}.bi-card .bi-thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform 0.35s ease}.bi-card:hover .bi-thumb img{transform:scale(1.03)}.bi-card .bi-content{padding:22px 24px 24px;flex:1;display:flex;flex-direction:column}.bi-card .bi-cat{display:inline-block;background:#eff6ff;color:#1a56db;font-size:0.72rem;font-weight:700;text-transform:uppercase;letter-spacing:0.05em;padding:3px 10px;border-radius:999px;margin-bottom:12px;align-self:flex-start}.bi-card h2{font-size:1.05rem;color:#0f172a;font-weight:700;line-height:1.4;margin:0 0 10px;letter-spacing:-0.3px}.bi-card p{font-size:0.88rem;color:#64748b;line-height:1.6;margin:0 0 14px;flex:1}.bi-meta{display:flex;justify-content:space-between;align-items:center;font-size:0.78rem;color:#64748b;padding-top:12px;border-top:1px solid #f1f5f9}.bi-meta .bi-author{font-weight:600;color:#1e293b}article.bi-card{cursor:default}article.bi-card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(15,23,42,0.08);border-color:#93c5fd}.bi-card-img{display:block;color:inherit;text-decoration:none}.bi-card h2 a{color:inherit;text-decoration:none}.bi-card h2 a:hover{color:#1a56db}a.bi-cat{text-decoration:none;cursor:pointer}a.bi-cat:hover{background:#1a56db;color:#fff}.bi-cat-meta{margin-top:14px;font-size:0.94rem;color:rgba(255,255,255,0.92)}.bi-cat-meta a{color:#fff;text-decoration:underline}.bi-cat-nav,.bi-other-cats{margin-top:42px;padding:24px 26px;background:#fff;border-radius:14px;border:1px solid #e2e8f0}.bi-cat-nav h2,.bi-other-cats h3{margin:0 0 14px;font-size:1.1rem;color:#0f172a;font-weight:700;letter-spacing:-0.2px}.bi-cat-list{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0}.bi-cat-list a{display:inline-block;background:#eff6ff;color:#1a56db;font-size:0.85rem;font-weight:600;padding:8px 14px;border-radius:999px;text-decoration:none;transition:background 0.16s,color 0.16s}.bi-cat-list a:hover{background:#1a56db;color:#fff}@media (max-width:720px){.bi-hero{padding:36px 0}.bi-hero h1{font-size:1.5rem}.bi-body{padding:30px 0 48px}.bi-grid{grid-template-columns:1fr;gap:14px}.bi-cat-nav,.bi-other-cats{margin-top:28px;padding:18px 18px}}.bi-faq{margin-top:32px;padding:24px 26px;background:#fff;border-radius:14px;border:1px solid #e2e8f0}.bi-faq h2{margin:0 0 14px;font-size:1.15rem;color:#0f172a;font-weight:700;letter-spacing:-0.2px}.bi-faq-item{border-bottom:1px solid #f1f5f9;padding:10px 0}.bi-faq-item:last-child{border-bottom:0}.bi-faq-item summary{cursor:pointer;font-weight:600;color:#0f172a;font-size:.95rem;list-style:none;padding:4px 0;display:flex;justify-content:space-between;align-items:center;gap:14px}.bi-faq-item summary::-webkit-details-marker{display:none}.bi-faq-item summary::after{content:'+';font-size:1.3rem;color:#1a56db;font-weight:400}.bi-faq-item[open] summary::after{content:'−'}.bi-faq-item p{color:#475569;font-size:.9rem;line-height:1.7;margin:8px 0 6px}.bi-faq-item a{color:#1a56db}@media(max-width:720px){.bi-faq{padding:18px 18px}}