:root{--ink:#153b42;--teal:#dcece6;--paper:#fcfcf7;--coral:#df927a;--line:#cbdad4}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.9 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-underline-offset:5px}a:focus-visible{outline:3px solid #a75035;outline-offset:4px}a:hover{text-decoration-thickness:2px}.bn-shell{max-width:1520px;margin:auto;display:grid;grid-template-columns:210px minmax(0,1fr);min-height:100vh}.bn-rail{padding:42px 28px;background:#e4eee8;border-right:1px solid var(--line)}.bn-brand{display:block;font:800 32px Georgia,serif;text-decoration:none}.bn-brand span{font:12px/2 sans-serif;display:block;margin-top:9px}.bn-rail nav{display:grid;gap:9px;margin:55px 0}.bn-rail nav a,.bn-rail nav span{padding:10px 0;border-bottom:1px solid #bdcfc6;font-size:14px;text-decoration:none}.bn-rail nav span{font-weight:700}.bn-rail>p{font-size:11px;line-height:2.2;color:#4e7069}.bn-main{padding:42px 45px 65px}.bn-workspace{display:grid;grid-template-columns:1fr .86fr;gap:35px;align-items:start}.bn-eyebrow{font-size:11px;letter-spacing:2px;font-weight:700;color:#4f7770;margin:0 0 15px}h1{font-size:clamp(30px,3.6vw,48px);line-height:1.35;letter-spacing:-1px;margin:12px 0 24px}h2{font-size:27px;line-height:1.5;margin:10px 0 20px}h3{font-size:21px;line-height:1.6}.bn-intro>p:not(.bn-eyebrow){font-size:18px}.bn-primary{display:inline-block;background:var(--ink);color:white;padding:11px 20px;text-decoration:none;margin:18px 0 25px;font-size:14px}.bn-options{display:grid;gap:12px}.bn-options a{display:flex;justify-content:space-between;align-items:center;padding:14px 17px;background:var(--teal);text-decoration:none;gap:15px}.bn-options span{font-size:11px}.bn-workspace figure{margin:0}.bn-workspace img{display:block;width:100%;height:480px;object-fit:cover;object-position:65% center}.bn-workspace figcaption{font-size:10px;color:#668079;margin-top:7px}.bn-observation{display:grid;grid-template-columns:155px 1fr;border-top:3px solid var(--ink);border-bottom:1px solid var(--line);gap:25px;padding:28px 0;margin:45px 0}.bn-observation>span{font-size:12px;font-weight:700;padding-top:13px}.bn-observation p{max-width:650px;font-size:14px}.bn-observation h2{font-size:24px}.bn-triage>div{display:grid;grid-template-columns:1fr 1fr;gap:35px}.bn-triage article{border-left:4px solid var(--coral);padding-left:23px}.bn-triage p{font-size:14px}.bn-reading{margin:55px 0;display:grid;grid-template-columns:1fr 1fr;gap:0 35px}.bn-reading>header{grid-column:1/-1;margin-bottom:10px}.bn-resource{display:block;text-decoration:none;padding:22px 0;border-top:1px solid var(--line)}.bn-resource>span{font-size:11px;color:#57746b}.bn-resource h3{margin:6px 0 12px}.bn-resource p{font-size:13px}.bn-safety{padding:25px 30px;background:#f2e5d9;border-radius:0 30px 0 0}.bn-safety h2{font-size:23px}.bn-safety p{font-size:14px}.bn-footer{padding:32px 45px;background:var(--ink);color:#f4f7f0;font-size:12px}.bn-footer strong{font-size:22px}.bn-footer nav{display:flex;gap:25px;margin:18px 0}.bn-crumb{font-size:11px;margin-bottom:30px}.bn-article{max-width:760px;margin:auto}.bn-article h1{font-size:38px}.bn-article time{font-size:12px;color:#5c7771}.bn-body h2{margin-top:38px;font-size:25px}.bn-body a{display:inline-block;max-width:100%;vertical-align:baseline}.bn-answer{font-size:20px;border-left:5px solid var(--coral);padding:16px 23px;background:#eff3eb;margin:30px 0}.bn-facts{display:grid;grid-template-columns:155px 1fr;gap:0;border:1px solid var(--line);font-size:14px}.bn-facts dt,.bn-facts dd{margin:0;padding:13px 18px;border-bottom:1px solid var(--line)}.bn-facts dt{background:var(--teal);font-weight:700}.bn-case{border-top:1px solid var(--line);margin-top:30px}.bn-note{font-size:12px;border-top:1px solid var(--line);padding-top:20px;margin-top:30px}.bn-example{background:#e5eee8;padding:12px 25px;margin:35px 0}.bn-example blockquote{margin:20px 0;padding-left:20px;border-left:3px solid #638e81;font-size:15px}.bn-resources{display:grid;gap:20px}.bn-skip{position:absolute;top:-80px;left:15px}.bn-skip:focus{top:15px;background:white;padding:10px;z-index:5}@media(max-width:900px){.bn-shell{grid-template-columns:160px minmax(0,1fr)}.bn-rail{padding:30px 20px}.bn-main{padding:30px}.bn-workspace{grid-template-columns:1fr}.bn-workspace img{height:300px}.bn-rail nav{margin-top:35px}.bn-footer{padding:30px}}@media(max-width:600px){.bn-shell{display:block}.bn-rail{padding:18px 22px;border-right:0;border-bottom:1px solid var(--line)}.bn-brand{font-size:28px}.bn-brand span{display:inline;font-size:10px;margin-left:13px}.bn-rail nav{display:flex;gap:18px;margin:12px 0 0;flex-wrap:wrap}.bn-rail nav a,.bn-rail nav span{font-size:11px;padding:5px 0}.bn-rail>p{display:none}.bn-main{padding:28px 22px 45px}.bn-workspace{gap:25px}.bn-intro h1{font-size:33px}.bn-intro>p:not(.bn-eyebrow){font-size:16px}.bn-options a{padding:12px 15px}.bn-options span{font-size:10px}.bn-workspace img{height:270px}.bn-observation{display:block;margin:30px 0;padding:23px 0}.bn-observation h2{font-size:23px;margin-top:16px}.bn-triage>div{display:block}.bn-triage article{margin:25px 0;padding-left:18px}.bn-reading{display:block;margin:30px 0}.bn-reading h2{font-size:25px}.bn-safety{padding:20px}.bn-footer{padding:28px 22px}.bn-article h1{font-size:29px}.bn-body{overflow-wrap:anywhere}.bn-answer{font-size:18px;padding:14px 17px}.bn-facts{grid-template-columns:115px minmax(0,1fr);font-size:12px}.bn-facts dt,.bn-facts dd{padding:12px}.bn-example{padding:8px 20px}.bn-body h2{font-size:24px}}
