._experiment_47jwc_1{align-items:stretch}._stage_47jwc_4{background:#f6f5ff;justify-content:flex-start;gap:22px;padding:38px 32px 30px;overflow:visible}._intro_47jwc_11{text-align:center}._eyebrow_47jwc_14{letter-spacing:.14em;color:var(--indigo);font-size:10px;font-weight:800}._intro_47jwc_11 h1{margin:10px 0;font-size:clamp(27px,3vw,40px);font-weight:650}._intro_47jwc_11 p{color:var(--ink-soft);font-size:14px;line-height:1.5}._paper_47jwc_30{--cell:clamp(44px, 5vw, 70px);background-color:#fffefa;background-image:linear-gradient(#e5e9f575 1px,#0000 1px),linear-gradient(90deg,#e5e9f575 1px,#0000 1px);background-size:20px 20px;border:1px solid #dcdfee;border-radius:16px;width:min(100%,620px);padding:18px 24px 22px;position:relative;box-shadow:0 8px 0 -4px #ecebf7,0 14px 0 -7px #e3e2f0,0 16px 35px -25px #44406a}._paperHeader_47jwc_47{color:var(--ink-soft);border-bottom:1px solid #dcdfee;flex-wrap:wrap;justify-content:space-between;gap:8px;padding-bottom:15px;font-size:12px;display:flex}._paperHeader_47jwc_47>span:first-child{align-items:center;gap:7px;font-weight:700;display:inline-flex}._statusDot_47jwc_63{background:var(--green);border-radius:50%;width:7px;height:7px}._grid_47jwc_69{grid-template-columns:28px repeat(var(--columns), minmax(0, var(--cell)));justify-content:center;width:max-content;max-width:100%;margin:20px auto 0;display:grid;position:relative}._operator_47jwc_78{padding-top:calc(72px + var(--cell));font-size:36px;line-height:var(--cell);grid-area:1/1;align-self:start}._column_47jwc_86{border-radius:10px;flex-direction:column;grid-row:1;align-items:stretch;min-width:0;padding-bottom:8px;transition:background .15s;display:flex}._column_47jwc_86[data-highlight=true]{background:#edeaffc9}._place_47jwc_99{text-align:center;height:24px;color:var(--ink-muted);align-items:center;font-size:10px;font-weight:700;text-decoration:none;display:grid}._carrySpace_47jwc_109{justify-content:center;align-items:center;height:48px;display:flex}._carryInput_47jwc_115,._resultInput_47jwc_116{appearance:none;text-align:center;min-width:0;font-family:var(--display);font-variant-numeric:tabular-nums;color:var(--ink);caret-color:var(--indigo);border:2px solid #0000;border-radius:9px;padding:0;font-weight:650}._carryInput_47jwc_115{width:33px;height:33px;color:var(--indigo);background:#e9e8ff;font-size:24px}._carryInput_47jwc_115[data-visible=false]{opacity:0}._carryInput_47jwc_115[data-visible=true]:read-only{animation:.3s ease-out _carry-in_47jwc_1}._carryInput_47jwc_115:not(:read-only),._resultInput_47jwc_116:not(:read-only){border-color:var(--indigo);background:#fff;box-shadow:0 0 0 3px #4f46e51a}._carryInput_47jwc_115:focus,._resultInput_47jwc_116:focus{outline:none}._carryInput_47jwc_115:focus-visible,._resultInput_47jwc_116:focus-visible{outline:2px solid var(--indigo);outline-offset:3px}._operand_47jwc_157{height:var(--cell);font-family:var(--display);font-variant-numeric:tabular-nums;place-items:center;font-size:clamp(32px,4vw,43px);font-weight:550;display:grid}._resultSpace_47jwc_166{height:calc(var(--cell) + 16px);border-top:3px solid var(--ink);place-items:center;padding:8px 4px 0;display:grid}._resultInput_47jwc_116{width:100%;height:var(--cell);background:#f0f0f8;font-size:clamp(30px,4vw,43px)}._resultInput_47jwc_116:disabled{opacity:1;color:var(--ink)}._resultInput_47jwc_116[data-unused=true]{background:0 0}._resultInput_47jwc_116[data-correct=true]{color:var(--green-ink);background:#ddf4e8}._error_47jwc_190._error_47jwc_190{background:#fee2e2;border-color:#dc2626;animation:.3s linear _shake_47jwc_1;box-shadow:0 0 0 3px #fee2e2}._direction_47jwc_196{color:var(--ink-muted);justify-content:center;align-items:center;gap:8px;margin-top:20px;font-size:11px;display:flex}._feedback_47jwc_205,._hint_47jwc_206{width:min(100%,540px)}._instruction_47jwc_209,._success_47jwc_210{align-items:center;gap:13px;min-height:70px;display:flex;position:relative}._stepIcon_47jwc_217,._successIcon_47jwc_218{background:var(--indigo-tint);width:42px;height:42px;color:var(--indigo);font-family:var(--display);border-radius:13px;flex:none;place-items:center;font-size:22px;font-weight:700;display:grid}._instruction_47jwc_209 strong{text-transform:capitalize;font-size:15px}._instruction_47jwc_209 p,._success_47jwc_210 p{color:var(--ink-soft);margin-top:4px;font-size:13px;line-height:1.5}._hint_47jwc_206{background:#fff8df;border:1px solid #e9cd77;border-radius:14px;align-items:flex-start;gap:12px;padding:15px;font-size:13px;line-height:1.6;display:flex}._hint_47jwc_206>svg{color:#92700e}._hint_47jwc_206 p{margin-top:4px}._numpad_47jwc_259{grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;width:min(100%,540px);display:grid}._numpad_47jwc_259 button{min-width:0;min-height:51px;font-family:var(--display);background:#fff;border:1px solid #d9daef;border-bottom-width:3px;border-radius:12px;font-size:24px;font-weight:650;transition:background .15s,transform .15s}._numpad_47jwc_259 button:hover:enabled{background:var(--indigo-tint);border-color:#a5a1eb}._numpad_47jwc_259 button:active:enabled{transform:translateY(2px)}._numpad_47jwc_259 button:disabled{opacity:.4}._numpad_47jwc_259 ._clear_47jwc_289{font-family:var(--body);background:#eae9f5;grid-column:span 2;justify-content:center;align-items:center;gap:8px;font-size:14px;display:flex}._keyboardNote_47jwc_299{text-align:center;color:var(--ink-muted);margin-top:-11px;font-size:11px;line-height:1.5}._actions_47jwc_306{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}._actions_47jwc_306 button:disabled{opacity:.4;box-shadow:none;transform:none}._controls_47jwc_317{gap:22px;min-width:0}._controls_47jwc_317 h2{font-size:25px}._controls_47jwc_317 h3{font-family:var(--body);letter-spacing:0;font-size:14px}._muted_47jwc_329{color:var(--ink-soft);margin-top:7px;font-size:12px;line-height:1.6}._small_47jwc_335{color:var(--ink-muted);font-size:11px;line-height:1.6}._fieldset_47jwc_340{border:0;min-width:0;margin:0;padding:0}._fieldset_47jwc_340 legend{margin-bottom:10px;padding:0;font-size:14px;font-weight:750}._levels_47jwc_352,._modes_47jwc_353{background:var(--wash-strong);border-radius:13px;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;padding:4px;display:grid}._levels_47jwc_352 button,._modes_47jwc_353 button{background:0 0;border:0;border-radius:9px;justify-content:center;align-items:center;gap:6px;min-height:44px;padding:5px;font-size:12px;font-weight:700;display:flex}._levels_47jwc_352 button span{border:1px solid;border-radius:50%;place-items:center;width:18px;height:18px;font-size:10px;display:grid}._levels_47jwc_352 button[aria-pressed=true],._modes_47jwc_353 button[aria-pressed=true]{background:var(--ink);color:#fff;box-shadow:0 3px 6px #14163a15}._modes_47jwc_353{grid-template-columns:repeat(2,minmax(0,1fr))}._random_47jwc_393._random_47jwc_393{background:var(--indigo-tint);border-color:var(--indigo-tint);color:var(--indigo);border-radius:12px;width:100%}._random_47jwc_393._random_47jwc_393:hover{background:#dcdaff}._custom_47jwc_403{border-top:1px solid var(--line);flex-direction:column;gap:13px;padding-top:20px;display:flex}._custom_47jwc_403>button{border-radius:12px;font-size:13px}._operands_47jwc_414{grid-template-columns:minmax(0,1fr) 16px minmax(0,1fr);align-items:end;gap:8px;display:grid}._operands_47jwc_414 label{color:var(--ink-soft);flex-direction:column;gap:7px;font-size:11px;display:flex}._operands_47jwc_414 input{border:1px solid var(--line-strong);background:var(--wash);font-variant-numeric:tabular-nums;border-radius:10px;width:100%;min-width:0;height:46px;padding:8px 12px;font-size:20px;font-weight:600}._operands_47jwc_414>span{text-align:center;align-self:end;padding-bottom:12px}._operands_47jwc_414 input[aria-invalid=true]{border-color:#dc2626}._invalid_47jwc_447{color:#b91c1c;font-size:12px;line-height:1.5}._hintSetting_47jwc_452{justify-content:space-between;align-items:center;gap:8px;font-size:12px;font-weight:650;display:flex}._hintSetting_47jwc_452 select{border:1px solid var(--line-strong);background:var(--wash);min-width:55px;min-height:44px;font:inherit;color:inherit;border-radius:10px;padding:8px}._hintSetting_47jwc_452+._small_47jwc_335{margin-top:-14px}._metrics_47jwc_473{border-top:1px solid var(--line);grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0;padding-top:20px;display:grid}._metrics_47jwc_473>div{flex-direction:column;gap:7px;display:flex}._metrics_47jwc_473 dt{color:var(--ink-muted);font-size:10px}._metrics_47jwc_473 dd{font-family:var(--display);margin:0;font-size:27px;font-weight:650}._metrics_47jwc_473 small{color:var(--ink-muted);font-size:16px;font-weight:400}._rule_47jwc_501{background:#fff8df;border-radius:13px;align-items:flex-start;gap:10px;padding:15px;font-size:12px;line-height:1.65;display:flex}._rule_47jwc_501>svg{color:#92700e}._rule_47jwc_501 p{color:var(--ink-soft);margin-top:7px}._success_47jwc_210{background:var(--green-tint);border-radius:14px;padding:15px;overflow:hidden}._successIcon_47jwc_218{color:var(--green-ink);background:#fff}._success_47jwc_210 strong{color:var(--green-ink);font-size:16px}._success_47jwc_210 b{color:var(--green-ink);font-size:20px}._confetti_47jwc_536{pointer-events:none;position:absolute;inset:0}._confetti_47jwc_536 i{top:-12px;left:calc(var(--i) * 8% + 3%);background:var(--indigo);width:6px;height:11px;animation:1.2s ease-out both _confetti_47jwc_536;animation-delay:calc(var(--i) * 40ms);position:absolute}._confetti_47jwc_536 i:nth-child(3n){background:var(--yellow)}._confetti_47jwc_536 i:nth-child(3n+1){background:var(--orange)}._summary_47jwc_557{border-top:1px solid var(--line);padding-top:18px}._summary_47jwc_557 table{border-collapse:collapse;width:100%;margin:12px 0;font-size:12px}._summary_47jwc_557 th,._summary_47jwc_557 td{text-align:left;border-bottom:1px solid var(--line);padding:7px 0}._summary_47jwc_557 th:last-child,._summary_47jwc_557 td:last-child{text-align:right}@keyframes _shake_47jwc_1{20%,60%{transform:translate(-4px)}40%,80%{transform:translate(4px)}}@keyframes _carry-in_47jwc_1{0%{opacity:0;transform:translate(15px,18px)scale(.6)}to{opacity:1;transform:none}}@keyframes _confetti_47jwc_536{0%{opacity:1;transform:translateY(-10px)rotate(0)}to{opacity:0;transform:translateY(110px)rotate(240deg)}}@media (width>=721px) and (width<=1050px){._experiment_47jwc_1{grid-template-columns:minmax(0,1fr) 310px}._paper_47jwc_30{--cell:44px;padding-left:12px;padding-right:12px}._stage_47jwc_4{padding-left:16px;padding-right:16px}._controls_47jwc_317{padding:22px 18px}}@media (width<=720px){._stage_47jwc_4{gap:20px;padding:28px 16px;position:relative;top:auto}._intro_47jwc_11 h1{font-size:30px}._intro_47jwc_11 p{max-width:320px;font-size:13px}._paper_47jwc_30{--cell:clamp(35px, 10vw, 52px);padding:14px 12px 17px}._grid_47jwc_69{grid-template-columns:22px repeat(var(--columns), minmax(0, var(--cell)))}._operator_47jwc_78{padding-top:calc(72px + var(--cell));font-size:29px}._operand_47jwc_157,._resultInput_47jwc_116{font-size:31px}._carryInput_47jwc_115{width:29px;height:29px;font-size:21px}._numpad_47jwc_259{gap:7px}._numpad_47jwc_259 button{min-height:48px;font-size:22px}._actions_47jwc_306 ._button_47jwc_665{padding:0 14px;font-size:12px}._controls_47jwc_317{border-top:1px solid var(--line)}}@media (prefers-reduced-motion:reduce){._column_47jwc_86,._numpad_47jwc_259 button{transition:none}._error_47jwc_190._error_47jwc_190,._carryInput_47jwc_115[data-visible=true]:read-only,._confetti_47jwc_536 i{animation:none}._confetti_47jwc_536{display:none}}