.bc441-body{background:#f5f6f8;color:#15181c}.bc441-page{padding-bottom:96px}.bc441-hero{display:flex;justify-content:space-between;gap:24px;align-items:end;padding:34px 0 20px}.bc441-hero h1{font-size:clamp(2rem,5vw,4rem);line-height:.95;margin:.25rem 0 .65rem;letter-spacing:-.045em}.bc441-hero p{max-width:720px;font-size:1.05rem;color:#56606b;margin:0}.bc441-trust{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;min-width:360px}.bc441-trust div,.bc441-summary div{background:#fff;border:1px solid #e0e4e8;border-radius:14px;padding:12px}.bc441-trust strong,.bc441-summary strong{display:block;font-size:1.05rem}.bc441-trust span,.bc441-summary span{font-size:.78rem;color:#6b7280}.bc441-core{padding:20px;border-radius:22px}.bc441-corehead,.bc441-sectionhead,.bc441-bithead,.bc441-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}.bc441-corehead h2,.bc441-sectionhead h2,.bc441-bithead h3{margin:.15rem 0 0}.bc441-coreactions,.bc441-resultactions{display:flex;gap:8px}.bc441-bases{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px}.bc441-bases label>span,.bc441-tools label>span,.bc441-bitwise-controls label>span,.bc441-textgrid label>span{font-size:.76rem;font-weight:700;color:#56606b;display:block;margin-bottom:6px}.bc441-bases b{font-weight:500;color:#9aa1a8}.bc441-field{display:flex;border:1px solid #cfd5da;border-radius:14px;background:#fff;overflow:hidden}.bc441-field input{border:0!important;border-radius:0!important;min-width:0;flex:1;padding:14px 13px;font:700 1.05rem ui-monospace,SFMono-Regular,Menlo,monospace}.bc441-field button{border:0;border-left:1px solid #e5e8eb;background:#f8fafb;padding:0 12px}.bc441-error{margin-top:12px;padding:10px 12px;border-radius:10px;background:#fff1f1;color:#a52b2b;font-weight:700}.bc441-tools{display:flex;gap:10px;align-items:end;flex-wrap:wrap;margin-top:14px}.bc441-tools label{min-width:150px}.bc441-tools select,.bc441-tools button,.bc441-sectionhead select,.bc441-bitwise-controls input,.bc441-bitwise-controls select{height:40px;border:1px solid #cfd5da;border-radius:10px;background:#fff;padding:0 10px}.bc441-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}.bc441-summary strong{font:800 1.05rem ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}.bc441-bithead{margin-top:18px}.bc441-bithead small{color:#6b7280}.bc441-bitgrid{display:grid;grid-template-columns:repeat(16,minmax(38px,1fr));gap:5px;margin-top:10px;overflow-x:auto;padding-bottom:4px}.bc441-bit{border:1px solid #d4d9de;background:#fff;border-radius:9px;padding:7px 2px;text-align:center;min-width:38px}.bc441-bit.is-on{background:#15181c;color:#fff;border-color:#15181c}.bc441-bit b,.bc441-bit small{display:block}.bc441-bit small{font-size:.6rem;opacity:.68;margin-top:2px}.bc441-learn{display:grid;grid-template-columns:1.4fr .6fr;gap:14px;margin-top:14px}.bc441-learn>.panel{padding:18px;border-radius:18px}.bc441-breakdown{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}.bc441-term{padding:8px 10px;border-radius:10px;background:#f7f9fa;border:1px solid #e2e6e9;font:700 .82rem ui-monospace,monospace}.bc441-steps{margin-top:10px;color:#505963;font-size:.9rem}.bc441-steps ol{margin:.4rem 0 0;padding-left:1.25rem}.bc441-refgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:7px;margin-top:12px}.bc441-refgrid button{border:1px solid #dfe4e8;background:#fff;border-radius:10px;padding:10px;text-align:left}.bc441-refgrid code{font-weight:800}.bc441-tabs{display:flex;gap:8px;margin:16px 0 8px;overflow-x:auto}.bc441-tabs button{white-space:nowrap;border:1px solid #d5dadd;background:#fff;border-radius:999px;padding:9px 14px;font-weight:700}.bc441-tabs .is-active{background:#15181c;color:#fff;border-color:#15181c}.bc441-lab{padding:18px;border-radius:18px}.bc441-lab textarea,.bc441-practice input{width:100%;border:1px solid #ccd3d8;border-radius:12px;padding:12px;font:500 .95rem ui-monospace,monospace;resize:vertical;background:#fff}.bc441-textgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:10px}.bc441-actions{justify-content:flex-start;flex-wrap:wrap;margin-top:10px}.bc441-actions span{color:#6b7280;font-size:.8rem}.bc441-bitwise-controls{display:grid;grid-template-columns:1fr .8fr 1fr;gap:10px;margin-top:12px}.bc441-bitwise-controls input,.bc441-bitwise-controls select{width:100%}.bc441-bitwise-result{display:grid;gap:7px;margin-top:12px}.bc441-bitwise-result div{display:grid;grid-template-columns:70px 1fr;gap:8px;align-items:center;padding:9px 11px;background:#f7f9fa;border-radius:10px}.bc441-bitwise-result code{overflow:auto;font-size:.85rem}.bc441-bitwise-result .is-result{background:#15181c;color:#fff}.bc441-summary-small{grid-template-columns:repeat(3,1fr)}.bc441-practicehud{display:flex;gap:10px;align-items:center}.bc441-practicehud span{font-size:.8rem;color:#6b7280}.bc441-practice{padding:22px 0 14px}.bc441-practice h3{font-size:clamp(1.25rem,3vw,2rem);margin:.35rem 0}.bc441-practice>span{font-size:.75rem;font-weight:800;letter-spacing:.08em}.bc441-practice p{color:#5e6770}.bc441-practice form{display:flex;gap:8px}.bc441-practice form input{min-width:0}.bc441-panel{margin-top:14px;background:#fff;border:1px solid #e0e4e8;border-radius:16px}.bc441-panel summary{display:flex;justify-content:space-between;gap:12px;padding:15px 17px;cursor:pointer;font-weight:800}.bc441-panel summary small{font-weight:500;color:#6b7280}.bc441-guide{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;padding:0 17px 17px}.bc441-guide article{background:#f7f9fa;border-radius:12px;padding:13px}.bc441-guide h2{font-size:1rem;margin:0 0 4px}.bc441-guide p{font-size:.88rem;color:#59636c;margin:0}.bc441-toast{position:fixed;left:50%;bottom:82px;transform:translateX(-50%);background:#15181c;color:#fff;padding:10px 14px;border-radius:999px;z-index:30;font-weight:700}.bc441-body button{cursor:pointer}.bc441-body .btn{background:#15181c;color:#fff;border:1px solid #15181c;border-radius:10px;padding:10px 16px;font-weight:800}.bc441-body button:not(.btn):not(.bc441-bit){border:1px solid #d6dce0;background:#fff;border-radius:10px;padding:9px 12px}.bc441-body .eyebrow{font-size:.72rem;letter-spacing:.1em;font-weight:800;color:#6d7680}
@media(max-width:760px){.bc441-page{padding-left:12px;padding-right:12px}.bc441-tools select{width:100%;min-width:0;max-width:100%}.bc441-hero{display:block;padding-top:20px}.bc441-hero h1{font-size:2.45rem}.bc441-trust{min-width:0;margin-top:14px}.bc441-core{padding:14px}.bc441-corehead{align-items:flex-start}.bc441-bases{grid-template-columns:1fr 1fr;gap:8px}.bc441-field input{padding:12px 10px;font-size:.92rem}.bc441-field button{padding:0 8px;font-size:.72rem}.bc441-tools{display:grid;grid-template-columns:1fr 1fr}.bc441-tools label{min-width:0}.bc441-tools>button{grid-column:1/-1}.bc441-summary{grid-template-columns:1fr 1fr}.bc441-bithead{align-items:flex-start}.bc441-bithead small{font-size:.7rem;text-align:right}.bc441-bitgrid{grid-template-columns:repeat(8,minmax(34px,1fr));overflow:visible}.bc441-bit:nth-child(n+17){display:none}.bc441-learn{grid-template-columns:1fr}.bc441-mini-ref{display:none}.bc441-textgrid{grid-template-columns:1fr}.bc441-bitwise-controls{grid-template-columns:1fr 1fr}.bc441-bitwise-controls label:first-child{grid-column:1/-1}.bc441-guide{grid-template-columns:1fr}.bc441-practice form{display:grid;grid-template-columns:1fr auto}.bc441-tabs{margin-top:12px}.bc441-coreactions{gap:5px}.bc441-coreactions button{padding:8px!important}.bc441-trust div{padding:9px}.bc441-trust span{font-size:.68rem}.bc441-hero p{font-size:.92rem}}
@media(max-width:420px){.bc441-bases{grid-template-columns:1fr}.bc441-summary{grid-template-columns:repeat(2,1fr)}.bc441-bitgrid{grid-template-columns:repeat(8,1fr)}.bc441-bit{min-width:0}.bc441-sectionhead{align-items:flex-start}.bc441-panel summary small{display:none}}