:root{--pv-blue:#3478c8;--pv-green:#3d9366;--pv-orange:#d88a20;--pv-purple:#8358b8;--pv-ink:#172b4d;--pv-muted:#687588;--pv-line:#dfe4e8;--pv-bg:#f3f5f4}.positions-page{background:var(--pv-bg);min-height:100vh;color:var(--pv-ink)}.positions-top{color:#fff;background:#152846;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;height:76px;padding:0 clamp(18px,3vw,46px);display:grid}.positions-top>a{color:#cdd8e7;font-weight:700;text-decoration:none}.positions-brand{align-items:center;gap:12px;display:flex}.positions-brand>span{color:#152846;background:#fff;border-radius:12px;place-items:center;width:42px;height:42px;font-weight:900;display:grid}.positions-brand div{display:grid}.positions-brand strong{font-size:20px}.positions-brand small{color:#aebdd0}.positions-top nav{justify-self:end;gap:5px;display:flex}.positions-top nav button{color:#b9c6d6;letter-spacing:.7px;cursor:pointer;background:0 0;border:0;border-radius:9px;padding:10px 13px;font-size:12px;font-weight:850}.positions-top nav button.active{color:#152846;background:#fff}.positions-layout{grid-template-columns:minmax(250px,23fr) minmax(480px,45fr) minmax(330px,32fr);align-items:start;gap:16px;width:min(1740px,100% - 32px);margin:24px auto 0;display:grid}.left-stack,.middle-stack,.right-stack{gap:16px;display:grid}.lab-card{border:1px solid var(--pv-line);background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 6px 20px #172b4d0b}.input-card,.info-card,.selected-explainer,.side-card,.regroup-panel{padding:19px}.step-label{color:#778397;letter-spacing:1.25px;font-size:10px;font-weight:900}.input-card form{gap:8px;margin:10px 0;display:flex}.input-card input{border:1px solid #bbc5cf;border-radius:10px;outline:0;width:100%;min-width:0;height:43px;padding:0 12px;font-size:18px;font-weight:750}.input-card input:focus{border-color:var(--pv-blue);box-shadow:0 0 0 3px #3478c821}.input-card form button,.random-button,.new-task,.mode-placeholder button{color:#fff;cursor:pointer;background:#152846;border:0;border-radius:10px;padding:0 14px;font-weight:750}.hero-number{letter-spacing:-2px;margin:10px 0 12px;font-size:clamp(36px,3.2vw,55px);display:block}.random-button{color:#263d5d;background:#eaf0f5;height:38px}.input-error{color:#b42318;font-size:12px}.info-card h2,.selected-explainer h2,.section-heading h2{margin:3px 0 14px;font-size:17px}.pv-table{gap:5px;display:grid}.pv-row{grid-template-columns:repeat(4,1fr);gap:4px;display:grid}.pv-row button,.pv-row span{text-align:center;background:#f4f6f7;border:0;border-radius:7px;min-width:0;padding:7px 2px;font-weight:750}.pv-row button{cursor:pointer}.pv-row.headers button{text-transform:uppercase;background:0 0;padding:5px 1px;font-size:9px}.pv-row.digits button{font-size:24px}.pv-row.values span{font-size:11px}.pv-row .selected{outline:2px solid}.blue{color:var(--pv-blue)!important}.green{color:var(--pv-green)!important}.orange{color:var(--pv-orange)!important}.purple{color:var(--pv-purple)!important}.expanded-form{flex-wrap:wrap;align-items:center;gap:7px;display:flex}.expanded-form span{align-items:center;gap:7px;display:flex}.expanded-form button{color:inherit;cursor:pointer;background:0 0;border:0;padding:0;font-size:18px;font-weight:850}.expanded-form i{color:#9aa4b2;font-style:normal}.quantity-list{gap:6px;display:grid}.quantity-list>button{text-align:left;color:var(--pv-ink);cursor:pointer;background:#f6f7f7;border:0;border-radius:9px;align-items:center;gap:10px;padding:7px 9px;display:flex}.quantity-list strong{font-size:17px}.selected-explainer{border-left:5px solid}.selected-explainer p{color:var(--pv-muted);margin:0 0 8px;font-size:13px}.selected-explainer>strong{color:var(--pv-ink)}.section-heading{justify-content:space-between;align-items:start;gap:12px;display:flex}.status-pill{color:#617086;background:#edf2f6;border-radius:999px;padding:6px 9px;font-size:10px;font-weight:700}.place-mat{padding:20px}.mat-grid{border:1px solid var(--pv-line);border-radius:13px;grid-template-columns:repeat(4,1fr);display:grid;overflow:hidden}.mat-column{border:0;border-right:1px solid var(--pv-line);cursor:pointer;background:#fbfcfc;flex-direction:column;align-items:center;min-width:0;min-height:420px;padding:15px 8px;display:flex}.mat-column:last-child{border:0}.mat-column.selected{background:color-mix(in srgb,currentColor 7%,white);box-shadow:inset 0 4px}.mat-label{color:currentColor;font-size:11px;font-weight:900}.mat-column small{color:#798698;margin-top:3px}.mat-digit{color:currentColor;margin:12px 0;font-size:46px;line-height:1}.blocks-area{flex:1;align-content:start;justify-items:center;width:100%;display:grid}.zero-note{color:#a4acb7;margin-top:35px;font-size:10px}.base-ten-group{flex-wrap:wrap;justify-content:center;align-items:flex-end;gap:5px;display:flex}.base-ten-group.compact{flex-wrap:nowrap;width:36px;min-height:28px;overflow:hidden}.base-block{background:color-mix(in srgb,currentColor 22%,white);border:1px solid;flex:none;display:inline-block;box-shadow:inset -2px -2px #14233714}.block-thousands{width:55px;height:55px;color:var(--pv-blue);background:repeating-linear-gradient(0deg,#0000 0 8px,#3478c82e 8px 9px),repeating-linear-gradient(90deg,#dceafb 0 8px,#adccec 8px 9px)}.block-hundreds{width:43px;height:43px;color:var(--pv-green);background:repeating-linear-gradient(0deg,#0000 0 5px,#3d936640 5px 6px),repeating-linear-gradient(90deg,#dcefe5 0 5px,#a8d4bc 5px 6px)}.block-tens{width:10px;height:48px;color:var(--pv-orange);background:repeating-linear-gradient(0deg,#f9e3bd 0 4px,#dca04c 4px 5px)}.block-ones{width:16px;height:16px;color:var(--pv-purple);background:#ded0ef}.compact .base-block{margin:-9px;transform:scale(.55)}.block-overflow{color:#5e6b7c;align-self:end;padding:4px;font-size:11px}.regroup-panel{padding:20px}.regroup-panel .section-heading>strong{font-size:20px}.exchange-grid{grid-template-columns:repeat(3,1fr);gap:9px;display:grid}.exchange{border:1px solid var(--pv-line);text-align:center;border-radius:12px;justify-items:center;gap:7px;padding:12px 8px;display:grid}.exchange-symbols{align-items:center;gap:12px;min-height:35px;display:flex}.exchange>strong{min-height:30px;font-size:11px}.exchange-actions{gap:5px;display:flex}.exchange-actions button{cursor:pointer;background:#e8eef4;border:0;border-radius:7px;padding:7px;font-size:10px;font-weight:800}.exchange-actions button:disabled{opacity:.35;cursor:not-allowed}.side-card{padding:18px}.zoom-lines{gap:17px;display:grid}.zoom-meta,.line-ends{color:#778397;justify-content:space-between;font-size:10px;display:flex}.zoom-meta strong{color:#34465f}.line-rail{background:#9dabba;border-radius:5px;height:5px;margin:22px 5px 6px;position:relative}.line-rail i{background:#718196;width:1px;height:13px;position:absolute;top:-4px}.current-marker{background:#e9584c;border:3px solid #fff;border-radius:50%;width:13px;height:13px;position:absolute;top:50%;transform:translate(-50%,-50%);box-shadow:0 1px 5px #516075}.current-marker b{color:#fff;white-space:nowrap;background:#e9584c;border-radius:4px;padding:2px 4px;font-size:9px;position:absolute;bottom:13px;left:50%;transform:translate(-50%)}.shift-card label{color:#758195;gap:3px;font-size:9px;font-weight:800;display:grid}.shift-card select{border:1px solid #cad1d8;border-radius:7px;padding:4px}.shift-flow{background:#f5f7f8;border-radius:10px;justify-content:space-between;gap:4px;padding:13px 8px;display:flex}.shift-flow+.shift-flow{margin-top:8px}.shift-flow span{align-items:center;gap:4px;display:flex}.shift-flow b{font-size:13px}.shift-flow small{color:#b6781d;font-size:8px;font-weight:850}.shift-flow.reverse{direction:rtl}.shift-flow.reverse span{direction:ltr}.positions-bottom{width:min(1740px,100% - 32px);margin:16px auto 50px}.exercise{grid-template-columns:minmax(220px,1fr) 2fr minmax(190px,.7fr);align-items:center;gap:24px;padding:22px;display:grid}.exercise-copy h2{margin:5px 0 8px}.exercise-copy p{color:var(--pv-muted);font-size:13px}.new-task{height:38px}.exercise-places{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.exercise-place{background:color-mix(in srgb,currentColor 5%,white);border:1px solid;border-radius:12px;justify-items:center;gap:8px;padding:12px 6px;display:grid}.exercise-place>span{text-transform:uppercase;font-size:10px;font-weight:850}.exercise-place>strong{font-size:27px}.exercise-place div{gap:7px;display:flex}.exercise-place button{cursor:pointer;background:#e8edf1;border:0;border-radius:7px;width:32px;height:30px;font-size:18px}.exercise-place button:disabled{opacity:.4}.exercise-feedback{color:#687588;text-align:center;background:#f0f2f4;border-radius:12px;padding:18px;font-weight:800}.exercise-feedback.correct{color:#247046;background:#e2f3e8}.mode-placeholder{border:1px solid var(--pv-line);text-align:center;background:#fff;border-radius:20px;width:min(760px,100% - 32px);margin:90px auto;padding:55px}.mode-placeholder span{color:var(--pv-blue);letter-spacing:2px;font-weight:900}.mode-placeholder h1{font-size:38px}.mode-placeholder p{color:var(--pv-muted)}.mode-placeholder button{height:44px}:is(button:focus-visible,input:focus-visible,select:focus-visible){outline-offset:2px;outline:3px solid #3478c859}@media (max-width:1250px){.positions-layout{grid-template-columns:minmax(250px,30fr) minmax(470px,70fr)}.right-stack{grid-column:1/-1;grid-template-columns:1fr 1fr}.exercise{grid-template-columns:1fr 2fr}.exercise-feedback{grid-column:1/-1}}@media (max-width:820px){.positions-top{grid-template-columns:1fr auto;height:auto;padding-block:13px}.positions-brand{justify-self:start}.positions-top>a{display:none}.positions-top nav{grid-column:1/-1;justify-content:center;justify-self:stretch}.positions-layout{grid-template-columns:1fr}.middle-stack,.right-stack{grid-column:auto;grid-template-columns:1fr}.left-stack{display:contents}.input-card{order:1}.info-card{order:2}.selected-explainer{order:3}.middle-stack{order:4}.right-stack{order:5}.positions-bottom{margin-top:16px}.exercise{grid-template-columns:1fr}.exercise-feedback{grid-column:auto}}@media (max-width:560px){.positions-brand small{display:none}.positions-layout,.positions-bottom{width:min(100% - 16px,1740px)}.place-mat{padding:10px}.mat-column{min-height:335px;padding-inline:3px}.mat-label{font-size:8px}.mat-digit{font-size:34px}.block-thousands{width:35px;height:35px}.block-hundreds{width:30px;height:30px}.exchange-grid{grid-template-columns:1fr}.exercise-places{grid-template-columns:repeat(2,1fr)}.shift-flow{overflow-x:auto}.pv-row.headers button{font-size:8px}}.mat-column{cursor:default;min-height:455px;padding-bottom:10px}.mat-select{width:100%;color:inherit;cursor:pointer;background:0 0;border:0;justify-items:center;display:grid}.blocks-area{padding-top:5px}.base-block{position:relative;box-shadow:inset -2px -2px #14233714,0 3px 5px #172b4d1f}.base-block:before,.base-block:after{content:"";border:1px solid;display:block;position:absolute}.block-thousands{background:repeating-linear-gradient(0deg,#0000 0 7px,#3478c833 7px 8px),repeating-linear-gradient(90deg,#dceafb 0 7px,#aac9eb 7px 8px);width:48px;height:48px;margin:8px 9px 0 0}.block-thousands:before{transform-origin:0 100%;background:repeating-linear-gradient(90deg,#eef6ff 0 7px,#bcd6ef 7px 8px);width:100%;height:10px;bottom:100%;left:6px;transform:skew(-35deg)}.block-thousands:after{transform-origin:0 0;background:repeating-linear-gradient(0deg,#8fb9e2 0 7px,#6ea1d4 7px 8px);width:11px;height:100%;top:-5px;left:100%;transform:skewY(-55deg)}.block-hundreds{width:44px;height:44px;margin:5px 5px 0 0}.block-hundreds:before{transform-origin:0 100%;background:#eaf7ef;width:100%;height:5px;bottom:100%;left:3px;transform:skew(-35deg)}.block-hundreds:after{transform-origin:0 0;background:#81bd9c;width:6px;height:100%;top:-3px;left:100%;transform:skewY(-55deg)}.block-tens{width:11px;height:48px;margin:3px 3px 0 0}.block-tens:before{transform-origin:0 100%;background:#fff2d7;width:100%;height:4px;bottom:100%;left:2px;transform:skew(-35deg)}.block-tens:after{transform-origin:0 0;background:#d3953d;width:4px;height:100%;top:-2px;left:100%;transform:skewY(-55deg)}.block-ones{margin:3px 3px 0 0}.block-ones:before{transform-origin:0 100%;background:#f0e9f8;width:100%;height:4px;bottom:100%;left:2px;transform:skew(-35deg)}.block-ones:after{transform-origin:0 0;background:#a985cf;width:4px;height:100%;top:-2px;left:100%;transform:skewY(-55deg)}.mat-exchange-actions{border-top:1px solid var(--pv-line);gap:5px;width:100%;padding-top:9px;display:grid}.mat-exchange-actions button{background:color-mix(in srgb,currentColor 12%,#edf1f4);color:currentColor;cursor:pointer;border:0;border-radius:7px;min-width:0;height:30px;font-size:10px;font-weight:850}.mat-exchange-actions button:disabled{color:#a9afb7;cursor:not-allowed;opacity:.72;background:#eef0f2}@media (max-width:560px){.mat-column{min-height:390px}.block-thousands{width:34px;height:34px}.block-hundreds{width:29px;height:29px}.mat-exchange-actions button span{display:none}.mat-exchange-actions button{font-size:16px}}.positions-layout{margin-bottom:50px}.mat-column{min-height:650px}.base-block:before,.base-block:after{content:none}.block-thousands{border:2px solid var(--pv-blue);background:repeating-linear-gradient(0deg,#0000 0 8px,#3478c838 8px 9px),repeating-linear-gradient(90deg,#dceafb 0 8px,#9fc4e9 8px 9px);border-radius:2px;width:58px;height:58px;margin:0;box-shadow:inset 0 0 0 3px #ffffff73,4px 4px #9fc4e9,0 4px 7px #172b4d21}.block-hundreds{border:2px solid var(--pv-green);background:repeating-linear-gradient(0deg,#0000 0 5px,#3d936640 5px 6px),repeating-linear-gradient(90deg,#dcefe5 0 5px,#9dcfb4 5px 6px);border-radius:2px;width:48px;height:48px;margin:0;box-shadow:0 3px 5px #172b4d1c}.block-tens{border:2px solid var(--pv-orange);background:repeating-linear-gradient(0deg,#f9e3bd 0 4px,#dca04c 4px 5px);border-radius:2px;width:12px;height:52px;margin:0;box-shadow:0 3px 5px #172b4d1c}.block-ones{border:2px solid var(--pv-purple);background:#ded0ef;border-radius:2px;width:18px;height:18px;margin:0;box-shadow:0 2px 4px #172b4d1c}@media (max-width:560px){.mat-column{min-height:520px}.block-thousands{width:38px;height:38px}.block-hundreds{width:32px;height:32px}.block-tens{width:10px;height:42px}.block-ones{width:15px;height:15px}}