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.15s}.sign-toggle-btn:hover:not(:disabled){border-color:var(--mustard)}.sign-toggle-btn:active:not(:disabled){background:var(--ink-panel)}.sign-toggle-btn:disabled{opacity:.5;cursor:not-allowed}.numeric-hint{font-family:var(--font-mono);color:var(--chalk-dim);margin-top:6px;font-size:12px}.numeric-hint-top{margin-bottom:20px}.concept-explanation{margin-bottom:28px}.concept-form{background:var(--ink-panel);border:1px solid var(--line-mid);border-radius:var(--radius);padding:28px}.concept-input-label{font-family:var(--font-mono);letter-spacing:.04em;text-transform:uppercase;color:var(--chalk-dim);margin-bottom:12px;font-size:12px;display:block}.concept-inputs-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.concept-input-wrap{align-items:center;display:flex;position:relative}.concept-input-wrap input{background:var(--ink-deep);border:1px solid var(--line-mid);width:90px;font-family:var(--font-mono);color:var(--chalk);text-align:center;border-radius:9px;padding:12px 14px;font-size:16px}.concept-input-wrap input:focus{border-color:var(--mustard);outline:none}.remove-input-btn{background:var(--coral);color:#2a1410;cursor:pointer;border:none;border-radius:50%;width:20px;height:20px;font-size:13px;line-height:1;position:absolute;top:-8px;right:-8px}.add-input-btn{border:1px dashed var(--line-mid);color:var(--chalk-dim);font-family:var(--font-mono);cursor:pointer;background:0 0;border-radius:9px;padding:12px 16px;font-size:13px}.add-input-btn:hover{border-color:var(--mustard);color:var(--mustard)}.concept-result{background:var(--ink-panel);border:1px solid var(--line-mid);border-radius:var(--radius);margin-top:32px;padding:28px}.ladder-display{margin-top:16px}.ladder-row{align-items:center;gap:12px;padding:10px 0;display:flex}.ladder-row:not(:last-child){padding-left:calc(var(--ladder-indent,0) * 20px)}.ladder-row:first-child{--ladder-indent:0}.ladder-row:nth-child(2){--ladder-indent:1}.ladder-row:nth-child(3){--ladder-indent:2}.ladder-row:nth-child(4){--ladder-indent:3}.ladder-row:nth-child(5){--ladder-indent:4}.ladder-row:nth-child(6){--ladder-indent:5}.ladder-divisor{text-align:right;width:28px;font-family:var(--font-mono);font-size:18px;font-weight:700}.ladder-bar{background:var(--line-mid);width:1px;height:24px}.ladder-numbers{font-family:var(--font-mono);color:var(--chalk-dim);gap:6px;font-size:17px;display:flex}.ladder-final-line{border-top:1px dashed var(--line-mid);margin-top:20px;padding-top:16px}.step-groups{flex-direction:column;gap:24px;margin-top:16px;display:flex}.step-label{font-family:var(--font-mono);color:var(--mustard);text-transform:uppercase;letter-spacing:.04em;margin-bottom:12px;font-size:12.5px}.step-lines{flex-direction:column;gap:8px;display:flex}.factor-line{font-family:var(--font-mono);color:var(--chalk-dim);font-size:16px}.final-line{font-family:var(--font-mono);color:var(--mint);font-size:19px;font-weight:600}.highlight-prime{opacity:.95;font-weight:700;-webkit-text-decoration:underline wavy;text-decoration:underline wavy}