:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#292735;background:#f7f7fa;font-synthesis:none;--purple:#7b62bf;--muted:#8b8997;--line:#eeedf2}*{box-sizing:border-box}body{margin:0}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;touch-action:manipulation}button:disabled{cursor:default}button:focus-visible,a:focus-visible{outline:3px solid #a38ad9;outline-offset:4px}button{transition:background .18s,transform .18s}button:active:not(:disabled){transform:scale(.97)}[hidden]{display:none!important}header{height:91px;max-width:1360px;margin:auto;padding:0 48px;display:flex;align-items:center;border-bottom:1px solid #e9e8ef;gap:24px}.brand{display:flex;align-items:center;text-decoration:none;color:#302c40;font-size:25px;font-weight:750;letter-spacing:-1px}.logo{font-size:29px;background:#8064bd;color:white;width:36px;height:36px;border-radius:11px;display:grid;place-items:center;margin-right:11px;font-weight:400}.brand-dot{color:#9276c9}.header-note{font-size:12px;color:#93909f;margin-left:auto}.help{border:1px solid #e1dfe9;background:transparent;border-radius:50%;color:#9791a7;width:30px;height:30px}main{max-width:1264px;margin:auto;padding:48px 24px 0}.intro{text-align:center;position:relative}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:#9b8cb6;display:flex;align-items:center;justify-content:center;gap:7px}.eyebrow>span{width:5px;height:5px;border-radius:50%;background:#a392be}h1{font-size:49px;line-height:1.14;letter-spacing:-2px;font-weight:650;margin:18px 0 16px;position:relative;display:inline-block}h1 span{color:#8d71ba}h1 svg{width:34px;height:34px;stroke:#cbbce1;stroke-width:2;position:absolute;right:-55px;top:16px}.intro>p{font-size:14px;line-height:1.65;color:#8e8a9a;margin:0}.workspace{display:grid;grid-template-columns:282px minmax(330px,1fr) 265px;gap:22px;margin-top:39px;align-items:start}.panel{background:#fff;border:1px solid #e9e7ef;border-radius:22px;box-shadow:0 5px 12px #30274603}.settings{padding:24px 21px}.section-label{font-size:14px;font-weight:650;display:flex;align-items:center;gap:9px}.mini-icon{font-size:20px;line-height:1;color:#9685b3}.setting-section{margin-top:25px}.setting-section h2{font-size:12px;font-weight:650;margin:0 0 7px}.caption{font-size:10px;color:var(--muted);margin:0 0 13px}.operations{display:grid;grid-template-columns:1fr 1fr;gap:8px}.op{position:relative;border:1px solid #ebe9f0;background:#fff;border-radius:11px;min-height:74px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:5px;font-size:10px;color:#716d7e}.op b{font-size:25px;font-weight:400;line-height:1}.op>span{display:none;position:absolute;top:6px;right:7px;font-size:9px}.op.selected{background:#f3eefb;border-color:#b39bd7;color:#7f60af}.op.selected>span{display:block}.sizes{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:12px}.sizes button{border:1px solid #ebe9f0;background:white;border-radius:9px;min-height:55px;font-size:11px;color:#6e6a7b}.sizes span{display:block;font-size:10px;color:#a4a0ad;margin-top:4px}.sizes .selected{background:#f4effb;border-color:#b8a2d9;color:#7c60ab}.sizes .selected span{color:#9b86ba}.tip{display:flex;gap:7px;font-size:9px;line-height:1.6;color:#9b96a5;margin:13px 0 0}.tip>span{font-size:12px}.primary{border:0;border-radius:11px;background:var(--purple);color:#fff;font-size:12px;font-weight:600;min-height:43px;box-shadow:0 3px 6px #755ba31c}.primary:hover:not(:disabled){background:#6c52b1}.start{width:100%;margin-top:23px;display:flex;align-items:center;justify-content:space-between;padding:0 14px}.start span{font-size:18px;font-weight:400}.settings-note{font-size:8px;text-align:center;color:#aaa4b1;margin:12px -10px 0}.practice{overflow:hidden;min-height:533px;display:flex;flex-direction:column}.practice-top{padding:21px 23px;display:flex;justify-content:space-between;gap:8px;border-bottom:1px solid #f4f2f7;align-items:center}.practice-label{font-size:10px;color:#8c829c;display:flex;align-items:center;gap:6px}.status-dot{width:5px;height:5px;border-radius:50%;background:#b7a3d4}.badge{font-size:9px;background:#f6f4fa;color:#a096b0;padding:6px 9px;border-radius:6px}#exercise-view{text-align:center;padding:25px 24px 16px;flex:1}.exercise-title{font-size:19px;font-weight:600;letter-spacing:-.4px}.exercise-subtitle{font-size:10px;color:#a09aa9;margin:9px 0 14px}.math-area{min-height:177px;display:flex;align-items:center;justify-content:center;overflow-x:auto;padding:8px 0 12px}.column{display:grid;gap:2px;font-family:ui-monospace,"SFMono-Regular",Menlo,monospace;position:relative}.math-row{display:flex;justify-content:flex-end;gap:5px;min-height:34px;align-items:center;position:relative}.math-digit{width:33px;height:35px;display:grid;place-items:center;font-size:28px;color:#56505f}.math-sign{width:24px;color:#9990a5;font-size:26px;margin-right:3px}.math-rule{height:1.5px;background:#a69baa;margin:5px 0 7px}.cell{width:33px;height:39px;border:1.5px solid #ddd5e9;background:#fcfaff;border-radius:7px;text-align:center;font:25px ui-monospace,"SFMono-Regular",Menlo,monospace;color:#6f53a8;padding:0;caret-color:#8663bb;outline:none;-moz-appearance:textfield}.cell:focus{border-color:#a083cc;background:#f3edfb;box-shadow:0 0 0 3px #eae1f644}.cell:disabled{opacity:1}.cell.good{background:#edf7f1;border-color:#b5d7c3;color:#488368}.cell.bad{border-color:#dba994;background:#fff4ee}.carry{height:23px;width:33px;font-size:13px;border:0;border-bottom:1px dashed #ddd4e6;border-radius:3px;background:transparent;color:#9c8bb4}.carry:focus{outline:1px solid #b9a0d8}.placeholder .cell{border-style:dashed}.placeholder .math-digit{color:#706877}.check{display:flex;align-items:center;justify-content:center;gap:30px;width:194px;margin:0 auto}.check:disabled{background:#eee9f6;color:#b4a4ca;box-shadow:none}.check span{opacity:.6}.keyboard-hint{font-size:9px;color:#aaa4b2;margin:13px 0 0}.feedback{font-size:12px;min-height:28px;padding:3px 0 9px;color:#9b7397}.feedback.success{color:#4f9575}.feedback.error{color:#ae775e}.practice-bottom{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:auto;border-top:1px solid #f0edf4;padding:17px 22px;font-size:9px;color:#a299ad}.small-spark{color:#aa95c6;font-size:15px;margin-right:4px}.practice-bottom button{font-size:10px;color:#8b8098;border:0;background:transparent;min-height:28px}.practice-bottom button:disabled{opacity:.4}.practice-bottom button span{margin-left:7px}.stats{padding:23px 20px 0}.stats .section-label{justify-content:space-between;margin-bottom:21px}.stats .section-label>span{color:#b2a2c9;font-size:17px}.stat{display:flex;align-items:center;gap:9px;margin:17px 0;font-size:10px;color:#8b8497}.stat strong{margin-left:auto;font-size:22px;font-weight:500;color:#655d76;font-variant-numeric:tabular-nums}.stat-icon{width:29px;height:29px;border-radius:9px;display:grid;place-items:center;font-size:16px}.total{background:#f0ebf8;color:#a08bbb}.correct{background:#eaf5ef;color:#8bb79f}.errors{background:#fff1e8;color:#d6a07d}.stats-foot{font-size:9px;text-align:center;border-top:1px solid #f1eef5;color:#aaa2b4;padding:15px 0;margin-top:19px}.encouragement{text-align:center;padding:9px 10px 23px;margin-top:19px;background:#f0edf6;border:1px solid #e9e4f1;border-radius:22px}.plant{height:119px}.plant svg{height:125px;width:130px}.encouragement h3{font-size:17px;font-weight:600;color:#7b6e95;line-height:1.4;margin:5px 0 10px}.encouragement p{font-size:10px;color:#a095af;line-height:1.8}.tiny-pill{display:inline-block;border-radius:20px;border:1px solid #ded6e9;padding:6px 13px;font-size:9px;color:#a091b1;margin-top:3px}.under-note{text-align:center;color:#aaa3b2;font-size:10px;padding:27px 10px 32px}.under-note>span{color:#c4b68d;margin-right:7px}footer{max-width:1264px;padding:22px 24px;margin:auto;display:flex;justify-content:space-between;border-top:1px solid #e9e7ee;font-size:10px;color:#97909f}.footer-light{font-size:9px;margin-left:11px;color:#b0a9b6}footer>span:last-child{font-size:9px;color:#afa7b7}.heart{color:#baaccb;font-size:15px;margin-left:4px}.keypad{display:none;grid-template-columns:repeat(6,1fr);gap:6px;max-width:310px;margin:14px auto 0}.keypad button{background:#f5f2f9;border:1px solid #e9e1f1;min-height:43px;border-radius:9px;color:#67547e;font-size:18px}.division{display:flex;align-items:flex-start;gap:10px}.division-left{display:flex;flex-direction:column;align-items:flex-end}.division-right{border-left:2px solid #a99ab7;padding-left:9px}.division-right .math-row:first-child{border-bottom:2px solid #a99ab7;padding-bottom:6px;margin-bottom:7px}.step-label{font-family:-apple-system,sans-serif;font-size:9px;color:#a196ac;padding:7px 0 4px}.shift{display:inline-block;width:33px;margin-left:5px}.work-label{position:absolute;left:-10px;transform:translateX(-100%);font:9px -apple-system,sans-serif;color:#aaa0b5;white-space:nowrap}#results-view{padding:27px 24px;flex:1;text-align:center}.result-icon{font-size:32px;color:#9b82c3;background:#f3edfa;border-radius:50%;width:65px;height:65px;display:grid;place-items:center;margin:0 auto 16px}#results-view h2{font-size:22px;margin:8px 0}#results-view>p{color:#9a90a5;font-size:12px;line-height:1.6}.error-list{text-align:left;max-height:300px;overflow:auto;padding:0;list-style:none;margin:18px 0}.error-list li{background:#f9f7fc;padding:13px;border:1px solid #eee8f4;border-radius:11px;margin:8px 0;display:flex;justify-content:space-between;align-items:center;gap:9px}.error-list b{font-size:13px;font-weight:600}.error-list small{display:block;font-size:10px;color:#ac91a6;margin-top:5px}.retry-one{font-size:10px;background:white;border:1px solid #ddd1ec;color:#8a6caf;border-radius:7px;padding:8px}.results-actions{display:flex;flex-direction:column;gap:8px}.secondary{border:1px solid #dfd6eb;border-radius:10px;background:white;color:#8b6fb0;padding:12px;font-size:12px}dialog{border:1px solid #e3dcea;border-radius:23px;max-width:420px;width:calc(100% - 36px);padding:30px;color:#5a5068;box-shadow:0 30px 100px #32214426}dialog::backdrop{background:#26203355;backdrop-filter:blur(5px)}dialog h2{font-size:22px}dialog p{font-size:13px;line-height:1.7;color:#8e829c}dialog>.dialog-close:first-child{float:right;border:0;background:none;color:#9882b0;font-size:24px;min-width:36px;min-height:36px}dialog>.primary{width:100%;margin-top:10px}@media(min-width:1400px){main{padding-top:55px}.workspace{margin-top:45px}}@media(max-width:1100px){.workspace{grid-template-columns:240px 1fr;gap:18px}.right-col{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:18px}.encouragement{margin-top:0;position:relative;min-height:200px;padding-top:18px}.plant{float:left;width:43%;height:160px;display:grid;place-items:center}.encouragement h3{margin-top:15px}.stats{padding-top:20px}.stats .section-label{margin-bottom:10px}.stat{margin:10px 0}.stats-foot{margin-top:10px}.header-note{font-size:11px}}@media(max-width:650px){header{height:72px;padding:0 22px}.brand{font-size:23px}.logo{width:33px;height:33px}.header-note{display:none}.help{margin-left:auto;min-width:36px;min-height:36px}main{padding:31px 17px 0}h1{font-size:36px;letter-spacing:-1.3px;margin:16px 0 13px}h1 svg{right:-23px;top:0;width:22px}.eyebrow{font-size:8px;letter-spacing:1.6px}.intro>p{font-size:12px}.workspace{display:flex;flex-direction:column;gap:16px;margin-top:28px}.settings,.practice,.right-col{width:100%}.settings{padding:20px}.setting-section{margin-top:20px}.operations{grid-template-columns:repeat(4,1fr);gap:6px}.op{min-height:66px;font-size:9px}.op b{font-size:24px}.sizes{grid-template-columns:repeat(4,1fr);gap:6px}.sizes button{font-size:10px;min-height:54px}.sizes span{font-size:9px}.tip{font-size:10px}.tip br{display:none}.settings-note{font-size:9px}.start{min-height:48px;font-size:13px;margin-top:18px}.practice-top{padding:18px}.practice{min-height:520px}.practice-top .badge{font-size:9px}#exercise-view{padding:23px 16px 18px}.math-area{min-height:177px}.check{min-height:48px;font-size:13px;width:220px}.keypad{display:grid}.keyboard-hint{font-size:10px;line-height:1.5}.practice-bottom{padding:13px 16px;font-size:9px}.practice-bottom button{min-height:36px;font-size:11px}.right-col{display:block}.encouragement{display:none}.stats{padding:19px 17px 0}.stats .section-label{font-size:13px}.stat{display:inline-flex;flex-direction:column;gap:7px;width:32%;font-size:9px;margin:13px 0}.stat strong{margin-left:0;font-size:24px}.stat-icon{display:none}.stats-foot{font-size:10px}.under-note{font-size:9px;line-height:1.7;padding:22px 8px}footer{padding:20px 17px;font-size:10px}footer>span:last-child{display:none}.footer-light{font-size:9px}.math-digit{font-size:25px;width:29px}.cell{width:29px;height:38px;font-size:23px}.carry{width:29px;height:23px;font-size:12px}.math-row{gap:4px}.shift{width:29px;margin-left:4px}}@media(pointer:coarse){.keypad{display:grid}.cell{caret-color:transparent}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* Читаемые подписи и удобный сенсорный ввод. */
.caption,.tip,.keyboard-hint,.exercise-subtitle{color:#82788f}.caption,.exercise-subtitle{font-size:11px}.settings-note{font-size:9px;color:#92879f}.badge{color:#847393}.practice-label{color:#80708f}.stats-foot{color:#8f819e}.sizes span{color:#8f849c}.stat{color:#80718e}.encouragement p{color:#8c7c9f}.footer-light{color:#91859c}.cell{min-height:44px}.carry{min-height:23px}.math-digit{height:38px}@media(max-width:650px){.math-digit,.cell,.carry{width:33px}.shift{width:33px}.cell{height:44px}.carry{height:24px}.keypad button{min-height:46px}.exercise-subtitle{line-height:1.5}.settings .section-label{font-size:15px}}

/* Знак действия располагается между строками, слева от всего столбика. */
.column{margin-left:32px}
.math-sign{position:absolute;left:-32px;top:-1px;transform:translateY(-50%);width:24px;margin:0;line-height:1;text-align:center}

/* Точки заимствования: повторное нажатие убирает отметку. */
.borrow-marker{position:relative;border:0;background:transparent;min-height:32px;height:32px;flex-shrink:0;padding:0;border-radius:6px;cursor:pointer}
.borrow-marker::after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:7px;height:7px;border:1px dashed #b9a7d0;border-radius:50%}
.borrow-marker[aria-pressed="true"]::after{background:#7b62bf;border:1px solid #7b62bf;width:8px;height:8px}
.borrow-marker:hover:not(:disabled){background:#f4effb}
.borrow-marker:focus-visible{outline:2px solid #a38ad9;outline-offset:0}
.borrow-marker:disabled{cursor:default}

/* В делении каждый разряд занимает одну неизменную колонку. */
.division{--digit-size:33px;--digit-gap:5px;margin-left:32px;gap:12px}
.division-left{display:grid;gap:2px;align-items:stretch;flex-shrink:0}
.division-row{min-height:44px;display:grid;grid-template-columns:repeat(var(--digits),var(--digit-size));column-gap:var(--digit-gap);justify-content:start}
.division-row .cell,.division-row .math-digit{width:var(--digit-size);min-width:0;grid-row:1}
.division-row .math-sign{left:calc(var(--sign-column) * (var(--digit-size) + var(--digit-gap)) - 29px);top:-1px;transform:translateY(-50%)}
.division-rule{min-height:0;height:10px;align-items:center}
.division-rule .math-rule{display:block;margin:0;width:100%}
.division-right{flex-shrink:0}
.division-right .math-row{justify-content:flex-start}
@media(max-width:650px){.division{--digit-gap:4px}}