/* Blog styles — Brothers Furnace & Duct Cleaning (scoped .bf-*) */
.bf-wrap{max-width:1180px;margin:0 auto;padding:0 20px 90px;font-family:var(--font-family--sarabun);color:#1d2b33}
.bf-crumbs{font-size:14px;color:#5b6b75;margin:0 0 28px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.bf-crumbs a{color:var(--_colors---dark);text-decoration:none}
.bf-crumbs a:hover{color:var(--_colors---primary)}
.bf-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:56px;align-items:start}
.bf-article{font-size:18px;line-height:1.75}
.bf-meta{display:flex;flex-wrap:wrap;gap:10px 18px;font-size:14px;color:#5b6b75;margin-bottom:22px;align-items:center}
.bf-chip{display:inline-block;background:rgba(216,125,62,.12);color:#b8611f;font-weight:600;border-radius:40px;padding:5px 14px;font-size:13px;letter-spacing:.4px;text-transform:uppercase}
.bf-article h2{font-family:var(--font-family--stack-sans-text);color:var(--_colors---dark);font-size:32px;line-height:1.2;margin:52px 0 16px;scroll-margin-top:120px}
.bf-article h3{font-family:var(--font-family--stack-sans-text);color:var(--_colors---dark);font-size:22px;line-height:1.3;margin:32px 0 10px}
.bf-article p{margin:0 0 18px}
.bf-article ul,.bf-article ol{margin:0 0 22px;padding-left:22px}
.bf-article li{margin-bottom:8px}
.bf-article a{color:var(--_colors---dark);font-weight:600;text-decoration:underline;text-decoration-color:rgba(216,125,62,.6);text-underline-offset:3px}
.bf-article a:hover{color:var(--_colors---primary)}
.bf-answer{position:relative;background:linear-gradient(135deg,#0a5a81 0%,#0d6f9e 100%);color:#fff;border-radius:22px;padding:30px 32px 28px;margin:0 0 34px;box-shadow:0 18px 40px -22px rgba(10,90,129,.7);overflow:hidden}
.bf-answer:after{content:"";position:absolute;right:-60px;top:-60px;width:200px;height:200px;border-radius:50%;background:radial-gradient(circle,rgba(216,125,62,.55),transparent 70%)}
.bf-answer-label{display:inline-flex;gap:8px;align-items:center;font-family:var(--font-family--stack-sans-text);font-size:13px;letter-spacing:1.4px;text-transform:uppercase;color:#ffd2b0;margin-bottom:10px}
.bf-answer p{margin:0;font-size:19px;line-height:1.65;position:relative;z-index:1}
.bf-answer a{color:#fff}
.bf-keys{border:1px solid rgba(10,90,129,.15);border-radius:18px;padding:22px 26px;background:#f7fafc;margin:0 0 34px}
.bf-keys h2{margin:0 0 12px!important;font-size:20px!important}
.bf-keys ul{margin:0;padding-left:20px}
.bf-table-wrap{overflow-x:auto;margin:6px 0 26px;border-radius:16px;border:1px solid rgba(10,90,129,.15)}
.bf-article table{border-collapse:collapse;width:100%;min-width:520px;font-size:16px;line-height:1.5}
.bf-article th{background:#0a5a81;color:#fff;text-align:left;padding:13px 16px;font-family:var(--font-family--stack-sans-text);font-weight:600}
.bf-article td{padding:12px 16px;border-top:1px solid rgba(10,90,129,.12);vertical-align:top}
.bf-article tr:nth-child(even) td{background:#f7fafc}
.bf-note{border-left:4px solid var(--_colors---primary);background:#fff7f1;padding:16px 20px;border-radius:0 14px 14px 0;margin:0 0 24px;font-size:17px}
.bf-cta{display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between;background:#0a5a81;color:#fff;border-radius:22px;padding:28px 30px;margin:44px 0}
.bf-cta h3{color:#fff!important;margin:0 0 6px!important;font-size:24px!important}
.bf-cta p{margin:0;color:rgba(255,255,255,.85);font-size:16px}
.bf-btns{display:flex;flex-wrap:wrap;gap:10px}
.bf-btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:50px;font-weight:700;font-size:15px;text-decoration:none!important;transition:transform .2s,box-shadow .2s;font-family:var(--font-family--stack-sans-text)}
.bf-btn:hover{transform:translateY(-2px)}
.bf-btn.orange{background:#d87d3e;color:#fff!important;box-shadow:0 10px 24px -12px rgba(216,125,62,.9)}
.bf-btn.ghost{background:rgba(255,255,255,.12);color:#fff!important;border:1px solid rgba(255,255,255,.35)}
.bf-faq{margin-top:12px}
.bf-faq details{border:1px solid rgba(10,90,129,.15);border-radius:16px;margin-bottom:12px;background:#fff;overflow:hidden}
.bf-faq summary{cursor:pointer;list-style:none;padding:18px 54px 18px 22px;font-family:var(--font-family--stack-sans-text);font-weight:600;color:var(--_colors---dark);position:relative;font-size:18px}
.bf-faq summary::-webkit-details-marker{display:none}
.bf-faq summary:after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);width:26px;height:26px;border-radius:50%;background:rgba(216,125,62,.15);color:#b8611f;display:grid;place-items:center;font-size:20px;line-height:1;transition:transform .25s}
.bf-faq details[open] summary:after{transform:translateY(-50%) rotate(45deg)}
.bf-faq details p{padding:0 22px 18px;margin:0;font-size:17px}
.bf-author{display:flex;gap:16px;align-items:center;border-top:1px solid rgba(10,90,129,.12);margin-top:44px;padding-top:24px;font-size:15px;color:#5b6b75}
.bf-author img{width:64px;height:64px;border-radius:50%;background:#fff;border:1px solid rgba(10,90,129,.15);padding:4px;object-fit:contain}
.bf-author strong{color:var(--_colors---dark);display:block;font-size:16px}
.bf-side{position:sticky;top:120px;display:flex;flex-direction:column;gap:20px}
.bf-card{border:1px solid rgba(10,90,129,.14);border-radius:20px;padding:22px;background:#fff}
.bf-card h4{font-family:var(--font-family--stack-sans-text);color:var(--_colors---dark);margin:0 0 12px;font-size:17px}
.bf-toc ol{margin:0;padding-left:18px;font-size:15px;line-height:1.5}
.bf-toc li{margin-bottom:8px}
.bf-toc a{color:#334550;text-decoration:none}
.bf-toc a:hover,.bf-toc a.on{color:var(--_colors---primary)}
.bf-book{background:linear-gradient(160deg,#0a5a81,#08476a);color:#fff;border:0}
.bf-book h4{color:#fff}
.bf-book .bf-price{font-family:var(--font-family--stack-sans-text);font-size:40px;font-weight:700;line-height:1;margin:4px 0 6px}
.bf-book .bf-price small{font-size:15px;font-weight:500;opacity:.8}
.bf-book p{font-size:14px;opacity:.85;margin:0 0 16px}
.bf-book .bf-btn{width:100%;justify-content:center;margin-bottom:8px}
.bf-related a{display:block;padding:10px 0;border-top:1px solid rgba(10,90,129,.1);color:#334550;text-decoration:none;font-size:15px;line-height:1.4}
.bf-related a:first-of-type{border-top:0}
.bf-related a:hover{color:var(--_colors---primary)}
/* hub */
.bf-hub-intro{max-width:760px;margin:0 auto 46px;text-align:center;font-size:19px;line-height:1.7;color:#334550}
.bf-hub-intro h2{font-family:var(--font-family--stack-sans-text);color:var(--_colors---dark);font-size:44px;line-height:1.15;margin:0 0 14px}
.bf-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.bf-post{display:flex;flex-direction:column;border-radius:24px;overflow:hidden;background:#fff;border:1px solid rgba(10,90,129,.12);text-decoration:none;color:inherit;transition:transform .3s,box-shadow .3s}
.bf-post:hover{transform:translateY(-6px);box-shadow:0 28px 50px -30px rgba(10,90,129,.55)}
.bf-post-img{aspect-ratio:16/9;overflow:hidden;background:#0a5a81}
.bf-post-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.bf-post:hover .bf-post-img img{transform:scale(1.05)}
.bf-post-body{padding:24px 26px 28px;display:flex;flex-direction:column;gap:12px;flex:1}
.bf-post-body h3{font-family:var(--font-family--stack-sans-text);color:var(--_colors---dark);font-size:24px;line-height:1.25;margin:0}
.bf-post-body p{margin:0;color:#4a5a64;font-size:16px;line-height:1.6}
.bf-post-more{margin-top:auto;font-weight:700;color:#d87d3e;font-family:var(--font-family--stack-sans-text);font-size:15px}
@media (max-width:991px){.bf-layout{grid-template-columns:minmax(0,1fr)}.bf-side{position:static}.bf-toc{display:none}}
@media (max-width:767px){.bf-article{font-size:17px}.bf-article h2{font-size:26px}.bf-grid{grid-template-columns:1fr}.bf-hub-intro h2{font-size:32px}.bf-answer{padding:24px 22px}.bf-answer p{font-size:17px}.bf-cta{padding:24px 22px}}