._83CXFW_root{--ink:#182838;--muted:#596978;--line:#dce3e8;--blue:#174f75;max-width:1660px;color:var(--ink);margin:0 auto;padding:26px 28px 36px;font-family:Arial,Noto Sans KR,sans-serif;font-size:17px;line-height:1.65}._83CXFW_root *{box-sizing:border-box}._83CXFW_root button,._83CXFW_root input,._83CXFW_root textarea,._83CXFW_root select{font:inherit}._83CXFW_root button,._83CXFW_root select{min-height:44px}._83CXFW_root button{cursor:pointer;border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:9px;padding:9px 14px}._83CXFW_root button:hover{background:#f0f5f8;border-color:#9aafbf}._83CXFW_root button:disabled{opacity:.6;cursor:default}._83CXFW_root :focus-visible{outline-offset:3px;outline:3px solid #5395c6}._83CXFW_root code{letter-spacing:.025em;white-space:normal;overflow-wrap:anywhere;font-family:Cambria Math,Cambria,Georgia,Noto Sans KR,serif}._83CXFW_header{justify-content:space-between;align-items:center;gap:24px;margin-bottom:30px;display:flex}._83CXFW_eyebrow{color:var(--blue);letter-spacing:.06em;font-weight:700;margin:0 0 6px!important;font-size:14px!important}._83CXFW_header h1{letter-spacing:-.035em;margin:0 0 8px;font-size:clamp(24px,2.2vw,34px);font-weight:650;line-height:1.35}._83CXFW_header h1 span{display:inline-block}._83CXFW_header p{color:var(--muted);margin:0;font-size:17px}._83CXFW_header a,._83CXFW_footer a{color:var(--blue);white-space:nowrap;text-underline-offset:4px;font-size:15px}._83CXFW_workspace{border-top:1px solid var(--line);background:#fff;grid-template-columns:minmax(230px,.8fr) minmax(380px,1.5fr) minmax(260px,.95fr);align-items:start;gap:0;display:grid}._83CXFW_problem,._83CXFW_notebook,._83CXFW_tools{min-width:0;padding:26px 22px}._83CXFW_problem{padding-left:0}._83CXFW_notebook{border-left:1px solid var(--line);min-height:620px}._83CXFW_tools{border-left:1px solid var(--line);align-self:stretch;padding-right:0}._83CXFW_sectionTitle{justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;display:flex}._83CXFW_sectionTitle h2{margin:0;font-size:23px;font-weight:650;line-height:1.3}._83CXFW_sectionTitle>span{color:var(--muted);font-size:14px}._83CXFW_caption{color:var(--muted);margin:12px 0 18px;font-size:14px;line-height:1.65}._83CXFW_controls{flex-wrap:wrap;align-items:center;gap:8px;display:flex}._83CXFW_controls label{font-size:14px}._83CXFW_root select,._83CXFW_root input{color:var(--ink);background:#fff;border:1px solid #b9c7d1;border-radius:8px;max-width:100%;padding:8px 10px}._83CXFW_controls select{width:75px}._83CXFW_controls button{margin-left:auto;padding:8px 11px;font-size:15px}._83CXFW_columnLabel{color:var(--muted);margin:24px 0 6px;font-size:14px}._83CXFW_problemLine{border-bottom:1px solid #e7ecef;grid-template-columns:26px minmax(0,1fr);align-items:baseline;gap:8px;padding:12px 0;display:grid}._83CXFW_problemLine>span{color:#6b7b89;font-size:15px}._83CXFW_problemLine code{font-size:23px;line-height:1.6}._83CXFW_goal{border-bottom:1px solid var(--line);margin:0 0 12px;padding:18px 0 24px}._83CXFW_goal>span{color:var(--muted);margin-bottom:9px;font-size:14px;display:block}._83CXFW_goal>div{grid-template-columns:26px minmax(0,1fr);align-items:baseline;gap:8px;display:grid}._83CXFW_goal b{color:#61788b;font-family:Cambria,serif;font-size:23px;font-weight:400}._83CXFW_goal code{font-size:27px;font-weight:550;line-height:1.55}._83CXFW_root ._83CXFW_solutionButton{width:100%;color:var(--blue);background:#fff;border-color:#afc3d0;min-height:49px;font-weight:650}._83CXFW_solution{margin-top:20px;padding-top:5px}._83CXFW_solutionTitle{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}._83CXFW_solution h3{margin:10px 0;font-size:18px}._83CXFW_solutionTitle>span,._83CXFW_alternative h3 small{color:var(--muted);font-size:14px;font-weight:400}._83CXFW_proofList{margin:16px 0;padding-left:25px}._83CXFW_proofList li{padding:5px 0 13px 4px;font-size:15px}._83CXFW_proofList code{font-size:22px;line-height:1.6;display:block}._83CXFW_proofList li>span{color:var(--muted);font-size:14px;display:block}._83CXFW_smallDetails,._83CXFW_smallDetails p{color:var(--muted);font-size:14px}._83CXFW_smallDetails summary,._83CXFW_footer summary{cursor:pointer;min-height:44px;padding:8px 0}._83CXFW_root ._83CXFW_secondary{background:#f7fafc;width:100%;margin-top:15px}._83CXFW_alternative{border-top:1px solid var(--line);margin-top:24px;padding-top:8px}._83CXFW_auxiliary{border-top:1px solid var(--line);flex-wrap:wrap;gap:8px;margin-top:22px;padding-top:16px;display:flex}._83CXFW_root ._83CXFW_auxiliary button{color:var(--blue);background:0 0;border:0;padding:6px 5px;font-size:14px}._83CXFW_custom{gap:12px;margin-top:15px;display:grid}._83CXFW_custom label{gap:6px;font-size:15px;display:grid}._83CXFW_custom textarea,._83CXFW_custom input{width:100%;color:var(--ink);background:#fff;border:1px solid #b9c7d1;border-radius:8px;padding:10px}._83CXFW_truthPanel{border-top:1px solid var(--line);margin-top:15px;padding-top:12px;font-size:15px}._83CXFW_truthPanel h3{font-size:18px}._83CXFW_truthInputs,._83CXFW_truthValues{flex-wrap:wrap;gap:12px;margin:15px 0;display:flex}._83CXFW_truthInputs label{align-items:center;gap:8px;display:flex}._83CXFW_truthValues span{background:#edf2f6;border-radius:6px;padding:5px 10px}._83CXFW_journal{border-top:1px solid var(--line);margin-top:24px}._83CXFW_proofRow{border-bottom:1px solid var(--line);position:relative}._83CXFW_root ._83CXFW_proofLine{text-align:left;background:0 0;border:0;border-radius:0;grid-template-columns:27px minmax(0,1fr) auto;align-items:baseline;gap:9px;width:100%;min-height:69px;padding:15px 8px;display:grid}._83CXFW_proofLine code{min-width:0;font-size:24px;line-height:1.6}._83CXFW_lineNumber{color:#748594;font-variant-numeric:tabular-nums;font-size:15px}._83CXFW_lineReason{color:var(--muted);text-align:right;max-width:105px;font-size:13px;line-height:1.65}._83CXFW_lineReason small{font-size:12px;display:block}._83CXFW_root ._83CXFW_proofLine:hover{background:#f4f8fb}._83CXFW_root ._83CXFW_selectedLine{background:#eaf3f9;box-shadow:inset 3px 0 #3377a5}._83CXFW_root ._83CXFW_selectedLine:hover{background:#e2eff8}._83CXFW_root ._83CXFW_editLine{color:#788995;opacity:0;background:0 0;border:0;min-height:24px;padding:1px 7px;font-size:11px;position:absolute;bottom:0;right:2px}._83CXFW_proofRow:hover ._83CXFW_editLine,._83CXFW_proofRow:focus-within ._83CXFW_editLine{opacity:1}._83CXFW_proofRow:has(._83CXFW_editLine) ._83CXFW_proofLine{padding-bottom:24px}._83CXFW_draft{background:#fcfdff;border-bottom:2px solid #9cbdd3;grid-template-columns:27px minmax(0,1fr);align-items:start;gap:9px;padding:15px 8px 14px;transition:background .15s;display:grid}._83CXFW_draft>._83CXFW_lineNumber{color:var(--blue);line-height:38px}._83CXFW_draftBody{min-width:0}._83CXFW_root ._83CXFW_draft textarea{resize:none;width:100%;min-height:39px;color:var(--ink);caret-color:var(--blue);background:0 0;border:0;border-radius:0;outline:none;margin:0;padding:0;font-family:Cambria Math,Cambria,Noto Sans KR,serif;font-size:24px;line-height:1.6;display:block;overflow:hidden}._83CXFW_draft:focus-within{border-bottom-color:var(--blue)}._83CXFW_draft textarea:focus-visible{outline:none}._83CXFW_dropActive{outline-offset:3px;background:#e7f2fa;outline:2px dashed #5c96bc}._83CXFW_rowEvidence{flex-wrap:wrap;align-items:center;gap:7px 13px;margin-top:10px;display:flex}._83CXFW_references{flex-wrap:wrap;align-items:center;gap:6px;font-size:13px;display:flex}._83CXFW_references>span{color:#617485}._83CXFW_references>small{color:#7a8995;font-size:12px}._83CXFW_root ._83CXFW_references button{background:#eaf3f9;border-color:#c4d9e7;border-radius:6px;min-height:30px;padding:2px 8px;font-size:13px}._83CXFW_references button small,._83CXFW_appliedRule button small{color:#6c8494;margin-left:7px;font-size:12px}._83CXFW_appliedRule{color:#7a8995;font-size:12px}._83CXFW_root ._83CXFW_appliedRule button{background:#edf3f7;border-color:#cad9e3;border-radius:6px;min-height:30px;padding:3px 8px;font-size:12px}._83CXFW_root ._83CXFW_confirmLine{min-height:34px;color:var(--blue);background:#fff;border-color:#afc9db;margin-left:auto;padding:3px 10px;font-size:13px}._83CXFW_good,._83CXFW_error{border-radius:8px;margin-top:16px;padding:13px 14px;font-size:15px}._83CXFW_good{color:#205639;background:#edf6f1;border:1px solid #c5ded0}._83CXFW_error{color:#863f24;background:#fff4ef;border:1px solid #e9c8b8}._83CXFW_complete{background:#eff6f3;border:1px solid #c5ded0;border-radius:10px;margin-top:22px;padding:22px}._83CXFW_complete>span{color:#276347;font-size:14px}._83CXFW_complete h3{margin:8px 0;font-size:22px}._83CXFW_complete p{font-size:16px}._83CXFW_toolShelf{position:sticky;top:180px}._83CXFW_tools ._83CXFW_caption{margin-bottom:14px}._83CXFW_keyboard{grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;display:grid}._83CXFW_root ._83CXFW_keyboard button{cursor:grab;background:#f9fbfd;min-height:62px;padding:7px 3px}._83CXFW_root ._83CXFW_keyboard button:active,._83CXFW_root ._83CXFW_ruleCard:active,._83CXFW_root ._83CXFW_letters button:active{cursor:grabbing}._83CXFW_keyboard b{font-family:Cambria,Georgia,serif;font-size:27px;font-weight:400;line-height:1.15;display:block}._83CXFW_keyboard small{color:var(--muted);white-space:nowrap;font-size:12px;display:block}._83CXFW_letters{flex-wrap:wrap;align-items:center;gap:7px;margin-top:10px;display:flex}._83CXFW_root ._83CXFW_letters button{cursor:grab;min-width:42px;padding:5px 12px;font-family:Cambria,Georgia,serif;font-size:20px}._83CXFW_notationHelp{color:var(--muted);margin:10px 0 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._83CXFW_ruleCard:disabled{opacity:1;color:var(--ink);cursor:default}._83CXFW_ruleName{color:#284e69;justify-content:space-between;align-items:center;gap:8px;font-size:15px;font-weight:650;display:flex}._83CXFW_grip{color:#9aaeba;font-size:20px;line-height:1}._83CXFW_ruleCard code{font-size:17px;line-height:1.55}._83CXFW_ruleDescription{color:var(--muted);font-size:13px;line-height:1.65}._83CXFW_footer{border-top:1px solid var(--line);color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:start;gap:20px;padding-top:18px;font-size:13px;display:flex}._83CXFW_footer details{max-width:360px}._83CXFW_footer summary{min-height:24px;padding:0}._83CXFW_footer p{margin-top:8px}._83CXFW_footer a{font-size:13px}@media (min-width:1450px){._83CXFW_problem,._83CXFW_notebook,._83CXFW_tools{padding-top:28px;padding-bottom:28px}._83CXFW_notebook{padding-left:30px;padding-right:30px}._83CXFW_tools{padding-left:26px}._83CXFW_ruleCards{max-height:620px}}@media 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