/* Education and worked-math tools. */
.division-school-method-panel {
    width: 100%;
}

.division-school-caption {
    max-width: 920px;
    margin: 0 0 14px;
    color: #4d4941;
    font: 700 .66rem/1.5 "Courier New", monospace;
}

.division-school-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, .55fr);
    gap: 18px;
    align-items: stretch;
}

.division-classic {
    min-width: 0;
    min-height: 480px;
    display: grid;
    place-items: center;
    padding: 30px 28px;
    overflow: hidden;
}

.division-school-board {
    width: 100%;
    min-width: 0;
}

.division-school-sheet {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    grid-template-rows: auto auto auto;
    align-items: start;
    width: 100%;
    min-width: 0;
    padding: 8px 6px 18px;
    font: 900 var(--division-font-size, 1.8rem)/1.12 "Courier New", monospace;
}

.division-school-digit-grid,
.division-school-row {
    display: grid;
    grid-template-columns: repeat(var(--division-columns), minmax(0, 1fr));
    width: 100%;
    min-width: 0;
}

.division-school-quotient {
    grid-column: 2;
    grid-row: 1;
    padding: 0 .14em .16em .72em;
}

.division-school-divisor {
    grid-column: 1;
    grid-row: 2;
    align-self: start;
    min-width: 2.2ch;
    padding: .3em .46em 0 0;
    text-align: right;
    white-space: nowrap;
}

.division-school-dividend {
    grid-column: 2;
    grid-row: 2;
    padding: .24em .14em .2em .72em;
    border-top: 3px solid var(--ink);
    border-left: 3px solid var(--ink);
}

.division-school-workrows {
    grid-column: 2;
    grid-row: 3;
    min-width: 0;
    padding: .08em .14em 0 .72em;
}

.division-school-digit {
    position: relative;
    display: block;
    min-width: 0;
    text-align: center;
    transition: opacity .16s ease, background-color .16s ease, box-shadow .16s ease;
}

.division-school-decimal-mark {
    position: absolute;
    right: -.16em;
    bottom: -.01em;
    color: var(--ink);
    font: inherit;
    font-style: normal;
}

.division-school-added-zero {
    color: var(--orange);
}

.division-school-row {
    min-height: 1.58em;
    align-items: end;
}

.division-school-value {
    position: relative;
    display: block;
    min-width: 0;
    padding: .06em .08em .12em;
    text-align: right;
    white-space: nowrap;
    transition: opacity .16s ease, background-color .16s ease, box-shadow .16s ease;
}

.division-school-product {
    border-bottom: 2px solid var(--ink);
}

.division-school-product::before {
    content: "−";
    position: absolute;
    left: -.7em;
    bottom: .08em;
}

.division-school-decimal-product {
    border-bottom-style: dashed;
}

.division-school-remainder {
    align-self: start;
    padding-top: .14em;
}

.division-school-brought {
    position: relative;
    display: block;
    align-self: start;
    padding-top: .14em;
    color: var(--orange);
    text-align: center;
    font: inherit;
    transition: opacity .16s ease, background-color .16s ease, box-shadow .16s ease;
}

.division-school-brought::before {
    content: "↓";
    position: absolute;
    left: 50%;
    top: -.68em;
    transform: translateX(-50%);
    color: var(--orange);
    font: 900 .55em/1 Arial, sans-serif;
}

.division-school-sheet .is-future {
    visibility: hidden;
    opacity: 0;
}

.division-school-sheet .is-current {
    z-index: 2;
    background: var(--yellow);
    box-shadow: 0 0 0 .12em var(--orange);
}

.division-school-sheet .division-school-brought.is-current {
    background: var(--orange);
    color: var(--ink);
}

.division-walkthrough {
    min-width: 0;
    display: flex;
    flex-direction: column;
    border: 3px solid var(--ink);
    background: var(--white);
    padding: 18px;
}

.division-walkthrough-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding-bottom: 11px;
    border-bottom: 2px solid var(--ink);
    font: 900 .62rem "Courier New", monospace;
    letter-spacing: .07em;
}

.division-walkthrough-topline span:last-child {
    background: var(--orange);
    padding: 6px 8px;
    color: var(--ink);
}

.division-walkthrough > strong {
    display: block;
    margin: 20px 0 10px;
    font: 900 clamp(1.05rem, 2vw, 1.5rem)/1.2 "Arial Black", Arial, sans-serif;
    text-transform: uppercase;
}

.division-walkthrough > p {
    margin: 0;
    color: #4d4941;
    font: 700 .76rem/1.65 "Courier New", monospace;
}

.division-walkthrough-equation {
    margin: 18px 0 22px;
    border: 2px solid var(--ink);
    background: var(--yellow);
    padding: 14px 12px;
    overflow-wrap: anywhere;
    text-align: center;
    font: 900 clamp(1rem, 2.2vw, 1.45rem)/1.25 "Courier New", monospace;
}

.division-walkthrough-controls {
    display: grid;
    grid-template-columns: 58px minmax(0, 1fr) 58px;
    align-items: center;
    gap: 12px;
    margin-top: auto;
    padding-top: 10px;
}

.division-walkthrough-arrow {
    width: 58px;
    height: 54px;
    border: 3px solid var(--ink);
    background: var(--orange);
    color: var(--ink);
    cursor: pointer;
    box-shadow: 3px 3px 0 var(--ink);
    font: 900 1.55rem/1 Arial, sans-serif;
}

.division-walkthrough-arrow:hover:not(:disabled),
.division-walkthrough-arrow:focus-visible:not(:disabled) {
    transform: translate(-1px, -1px);
    box-shadow: 5px 5px 0 var(--ink);
    outline: 0;
}

.division-walkthrough-arrow:disabled {
    background: var(--paper-deep);
    color: var(--muted);
    cursor: default;
    box-shadow: none;
}

.division-walkthrough-progress {
    min-width: 0;
    text-align: center;
    font: 800 .62rem "Courier New", monospace;
}

.division-walkthrough-track {
    height: 10px;
    margin-top: 7px;
    border: 2px solid var(--ink);
    background: var(--paper-deep);
    overflow: hidden;
}

.division-walkthrough-track i {
    display: block;
    width: 0;
    height: 100%;
    background: var(--orange);
    transition: width .18s ease;
}

.division-school-method-panel .division-identity {
    margin-top: 16px;
}

@media (max-width: 980px) {
    .division-school-layout {
        grid-template-columns: 1fr;
    }

    .division-classic {
        min-height: 400px;
    }

    .division-walkthrough {
        min-height: 300px;
    }
}

@media (max-width: 620px) {
    .division-classic {
        min-height: 330px;
        padding: 22px 12px;
    }

    .division-school-sheet {
        padding-left: 2px;
        padding-right: 2px;
        font-size: min(var(--division-font-size, 1.35rem), 1.35rem);
    }

    .division-school-quotient,
    .division-school-dividend,
    .division-school-workrows {
        padding-left: .5em;
    }

    .division-walkthrough {
        padding: 14px;
    }

    .division-walkthrough-controls {
        grid-template-columns: 52px minmax(0, 1fr) 52px;
        gap: 9px;
    }

    .division-walkthrough-arrow {
        width: 52px;
        height: 50px;
    }
}