/* Mainstream utility tools: WT-011 and beyond. */
.common-split-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, .9fr);
    gap: 22px;
}

.common-control-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.common-action-row { margin-top: 18px; }
.common-helper-text { color: var(--muted); font: 700 .66rem/1.4 "Courier New", monospace; }
.common-card-index { color: var(--orange); font: 900 .65rem "Courier New", monospace; letter-spacing: .08em; }

/* QR Code */
.qr-input { min-height: 150px; }
.color-tool-field input[type="color"] {
    width: 100%;
    min-height: 46px;
    border: 2px solid var(--ink);
    background: var(--white);
    padding: 4px;
    cursor: pointer;
}

.qr-preview-panel,
.image-preview-panel {
    min-width: 0;
    border: 2px solid var(--ink);
    background: var(--paper);
    padding: 16px;
}

.qr-preview {
    min-height: 340px;
    display: grid;
    place-items: center;
    margin: 8px 0 14px;
    border: 2px dashed var(--ink);
    background: var(--white);
    overflow: auto;
}

.qr-preview:empty::before {
    content: "QR PREVIEW";
    color: var(--muted);
    font: 900 .7rem "Courier New", monospace;
    letter-spacing: .08em;
}

.qr-preview canvas,
.qr-preview img { max-width: 100%; height: auto !important; }

/* Percentage */
.percentage-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.percentage-card {
    position: relative;
    min-width: 0;
    border: 2px solid var(--ink);
    background: var(--paper);
    padding: 18px;
}

.percentage-card h2 {
    margin: 8px 0 18px;
    font: 900 1.05rem/1.2 "Arial Black", Arial, sans-serif;
    text-transform: uppercase;
}

.percentage-equation {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 8px;
}

.percentage-equation input {
    width: 100%;
    min-width: 0;
    min-height: 52px;
    border: 2px solid var(--ink);
    background: var(--white);
    padding: 10px;
    outline: 0;
    font: 900 1rem "Courier New", monospace;
}

.percentage-equation input:focus { box-shadow: 3px 3px 0 var(--orange); }
.percentage-equation > span { font: 900 .62rem "Courier New", monospace; text-align: center; }

.percentage-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 16px;
    border-top: 2px solid var(--ink);
    padding-top: 14px;
}

.percentage-result span { color: var(--muted); font: 800 .62rem "Courier New", monospace; }
.percentage-result strong { overflow-wrap: anywhere; text-align: right; font: 900 1.55rem "Arial Black", Arial, sans-serif; }
.percentage-footer { justify-content: space-between; }

/* Image Resizer */
.image-drop-zone {
    display: grid;
    place-items: center;
    gap: 8px;
    min-height: 130px;
    margin-bottom: 20px;
    border: 3px dashed var(--ink);
    background: var(--paper);
    cursor: pointer;
    padding: 22px;
    text-align: center;
}

.image-drop-zone:hover,
.image-drop-zone:focus-within { background: var(--yellow); }
.image-drop-zone input { max-width: 100%; font: 700 .68rem "Courier New", monospace; }
.image-drop-zone strong { font: 900 .85rem "Arial Black", Arial, sans-serif; }
.image-drop-zone span { color: var(--muted); overflow-wrap: anywhere; font: 700 .65rem "Courier New", monospace; }

.image-meta-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 16px;
    border: 2px solid var(--ink);
}

.image-meta-strip span {
    min-width: 0;
    padding: 10px;
    border-right: 2px solid var(--ink);
    color: var(--muted);
    font: 700 .58rem/1.4 "Courier New", monospace;
}
.image-meta-strip span:last-child { border-right: 0; }
.image-meta-strip b { display: block; margin-top: 3px; color: var(--ink); overflow-wrap: anywhere; }
.image-lock-row { margin: 4px 0 14px; }

.image-control-column { display: flex; flex-direction: column; min-width: 0; }
.image-preview-panel { display: flex; flex-direction: column; }
.image-canvas-wrap {
    flex: 1 1 auto;
    min-height: 340px;
    display: grid;
    place-items: center;
    margin: 8px 0 14px;
    border: 2px dashed var(--ink);
    background: #d9d5ca;
    background-image: linear-gradient(45deg, #eee 25%, transparent 25%), linear-gradient(-45deg, #eee 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #eee 75%), linear-gradient(-45deg, transparent 75%, #eee 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    overflow: auto;
}
.image-canvas-wrap canvas { max-width: 100%; max-height: 420px; object-fit: contain; }
.image-download-slot { margin-top: auto; padding-top: 24px; }
.image-download-button {
    min-height: 60px;
    border: 3px solid var(--ink);
    background: var(--paper-deep);
    color: var(--muted);
    font-size: .78rem;
}
.image-download-button[data-ready="true"] {
    background: var(--green);
    color: var(--ink);
    opacity: 1;
    box-shadow: 5px 5px 0 var(--ink);
}
.image-download-button[data-ready="true"]:hover,
.image-download-button[data-ready="true"]:focus-visible {
    background: var(--yellow);
    transform: translate(-2px, -2px);
    box-shadow: 7px 7px 0 var(--ink);
    outline: 0;
}

/* Word Counter */
.word-stats-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    margin-bottom: 18px;
    border: 2px solid var(--ink);
    background: var(--white);
}
.word-stats-grid > div { min-width: 0; padding: 14px 12px; border-right: 1px solid var(--ink); }
.word-stats-grid > div:last-child { border-right: 0; }
.word-stats-grid span { display: block; color: var(--muted); font: 800 .56rem "Courier New", monospace; letter-spacing: .05em; }
.word-stats-grid strong { display: block; margin-top: 5px; overflow-wrap: anywhere; font: 900 1.35rem "Arial Black", Arial, sans-serif; }
.word-counter-field { margin-bottom: 0; }
.word-counter-input {
    width: 100%;
    min-height: 360px;
    resize: vertical;
    border: 2px solid var(--ink);
    background: var(--white);
    color: var(--ink);
    outline: 0;
    padding: 18px;
    font: 400 1rem/1.6 Georgia, "Times New Roman", serif;
}
.word-counter-input:focus { box-shadow: 4px 4px 0 var(--orange); }
.word-counter-footer { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.word-counter-footer .common-helper-text { margin-right: auto; }

/* Unit Converter */
.unit-category-row { max-width: 420px; margin-bottom: 18px; }
.unit-converter-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1fr);
    align-items: stretch;
    gap: 12px;
}
.unit-side-panel { min-width: 0; border: 2px solid var(--ink); background: var(--paper); padding: 18px; }
.unit-select-field { margin-bottom: 14px; }
.unit-value-field { margin-bottom: 0; }
.unit-big-input {
    width: 100%;
    min-height: 82px;
    border: 0;
    border-bottom: 3px solid var(--ink);
    background: var(--white);
    padding: 12px;
    outline: 0;
    font: 900 clamp(1.7rem, 4vw, 3rem) "Arial Black", Arial, sans-serif;
}
.unit-big-input:focus { background: var(--yellow); }
.unit-result-side { display: flex; flex-direction: column; }
.unit-result-side .tool-field { margin-top: 0; margin-bottom: 14px; }
.unit-big-result {
    min-height: 82px;
    display: flex;
    align-items: center;
    margin-bottom: 0;
    border-bottom: 3px solid var(--ink);
    background: var(--white);
    padding: 12px;
    overflow-wrap: anywhere;
    font: 900 clamp(1.7rem, 4vw, 3rem) "Arial Black", Arial, sans-serif;
}
.unit-swap-button {
    align-self: center;
    width: 58px;
    height: 58px;
    border: 2px solid var(--ink);
    background: var(--orange);
    cursor: pointer;
    box-shadow: 3px 3px 0 var(--ink);
    font: 900 1.35rem Arial, sans-serif;
}
.unit-swap-button:hover,
.unit-swap-button:focus-visible { transform: translate(-1px, -1px); box-shadow: 5px 5px 0 var(--ink); outline: 0; }
.unit-formula { margin-top: 14px; border: 2px solid var(--ink); background: var(--yellow); padding: 11px 13px; overflow-wrap: anywhere; font: 700 .72rem/1.4 "Courier New", monospace; }

/* Long Division */
.division-input-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 58px minmax(0, 1fr);
    align-items: end;
    gap: 12px;
}
.division-number-input {
    width: 100%;
    min-width: 0;
    min-height: 64px;
    border: 3px solid var(--ink);
    background: var(--white);
    color: var(--ink);
    outline: 0;
    padding: 10px 14px;
    font: 900 clamp(1.4rem, 3vw, 2.15rem) "Arial Black", Arial, sans-serif;
}
.division-number-input:focus { background: var(--yellow); box-shadow: 4px 4px 0 var(--orange); }
.division-symbol {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    margin-bottom: 14px;
    border: 2px solid var(--ink);
    background: var(--orange);
    box-shadow: 3px 3px 0 var(--ink);
    font: 900 1.65rem Arial, sans-serif;
}
.division-toolbar {
    display: flex;
    align-items: end;
    flex-wrap: wrap;
    gap: 12px;
    margin: 10px 0 18px;
}
.division-decimal-places {
    display: grid;
    grid-template-columns: auto 90px;
    align-items: center;
    gap: 8px;
}
.division-decimal-places > span { font: 800 .62rem "Courier New", monospace; }
.division-decimal-places .tool-select { min-height: 40px; padding: 7px 10px; }
.division-answer-panel {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 4px 18px;
    margin-bottom: 18px;
    border: 3px solid var(--ink);
    background: var(--yellow);
    padding: 16px 18px;
    box-shadow: 5px 5px 0 var(--ink);
}
.division-answer-panel > span { grid-row: 1 / span 2; font: 900 .68rem "Courier New", monospace; letter-spacing: .08em; writing-mode: vertical-rl; transform: rotate(180deg); }
.division-answer-panel strong { min-width: 0; overflow-wrap: anywhere; font: 900 clamp(2rem, 5vw, 4.4rem)/1 "Arial Black", Arial, sans-serif; }
.division-answer-panel small { color: #4d4941; font: 700 .66rem/1.4 "Courier New", monospace; }
.division-work-grid {
    display: grid;
    grid-template-columns: minmax(280px, .8fr) minmax(0, 1.2fr);
    gap: 18px;
}
.division-classic-panel,
.division-steps-panel { min-width: 0; border: 2px solid var(--ink); background: var(--paper); padding: 18px; }
.division-classic {
    padding: 34px 20px 30px;
    border: 2px solid var(--ink);
    background: var(--white);
    overflow-x: auto;
    font-family: "Courier New", monospace;
}
.division-classic-answer {
    margin-left: clamp(64px, 18%, 120px);
    padding: 0 10px 8px;
    border-bottom: 3px solid var(--ink);
    overflow-wrap: anywhere;
    font: 900 clamp(1.55rem, 4vw, 2.75rem) "Courier New", monospace;
}
.division-classic-problem { display: flex; align-items: flex-start; min-width: max-content; }
.division-classic-divisor { min-width: 64px; padding: 12px 10px 8px 0; text-align: right; font: 900 1.55rem "Courier New", monospace; }
.division-classic-dividend { min-width: 160px; padding: 12px 12px 8px; border-left: 3px solid var(--ink); border-top: 3px solid var(--ink); font: 900 1.55rem "Courier New", monospace; }
.division-identity { margin: 14px 0 0; padding: 10px 12px; border: 2px solid var(--ink); background: var(--yellow); overflow-wrap: anywhere; font: 700 .68rem/1.4 "Courier New", monospace; }
.division-step-list { display: grid; gap: 10px; }
.division-step-card {
    display: grid;
    grid-template-columns: 52px minmax(0, 1fr);
    border: 2px solid var(--ink);
    background: var(--white);
}
.division-step-card.division-decimal-step { background: #fff8d5; }
.division-step-number {
    display: grid;
    place-items: center;
    border-right: 2px solid var(--ink);
    background: var(--orange);
    font: 900 .72rem "Courier New", monospace;
}
.division-decimal-step .division-step-number { background: var(--yellow); }
.division-step-content { min-width: 0; padding: 12px 14px; }
.division-step-content > strong { display: block; margin-bottom: 10px; font: 900 .76rem "Arial Black", Arial, sans-serif; letter-spacing: .03em; }
.division-step-math {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border: 1px solid var(--ink);
}
.division-step-math span { min-width: 0; padding: 9px; border-right: 1px solid var(--ink); overflow-wrap: anywhere; font: 700 .68rem/1.4 "Courier New", monospace; }
.division-step-math span:last-child { border-right: 0; }
.division-step-math b { display: block; margin-bottom: 4px; color: var(--muted); font-size: .54rem; letter-spacing: .08em; }
.division-step-note { margin: 9px 0 0; color: #4d4941; font: 700 .64rem/1.45 "Courier New", monospace; }
.division-empty { padding: 28px 16px; border: 2px dashed var(--muted); color: var(--muted); text-align: center; font: 800 .68rem "Courier New", monospace; }

@media (max-width: 1050px) {
    .percentage-grid { grid-template-columns: 1fr; }
    .word-stats-grid { grid-template-columns: repeat(3, 1fr); }
    .word-stats-grid > div:nth-child(3) { border-right: 0; }
    .word-stats-grid > div:nth-child(-n+3) { border-bottom: 1px solid var(--ink); }
    .division-work-grid { grid-template-columns: 1fr; }
}

@media (max-width: 800px) {
    .common-split-grid { grid-template-columns: 1fr; }
    .unit-converter-grid { grid-template-columns: 1fr; }
    .unit-swap-button { transform: rotate(90deg); justify-self: center; }
    .unit-swap-button:hover,
    .unit-swap-button:focus-visible { transform: rotate(90deg) translate(-1px, 1px); }
    .division-input-grid { grid-template-columns: 1fr; }
    .division-symbol { transform: rotate(90deg); justify-self: center; margin: 0; }
    .division-step-math { grid-template-columns: 1fr; }
    .division-step-math span { border-right: 0; border-bottom: 1px solid var(--ink); }
    .division-step-math span:last-child { border-bottom: 0; }
}

@media (max-width: 620px) {
    .common-control-grid,
    .image-meta-strip { grid-template-columns: 1fr; }
    .image-meta-strip span { border-right: 0; border-bottom: 1px solid var(--ink); }
    .image-meta-strip span:last-child { border-bottom: 0; }
    .percentage-equation { grid-template-columns: 1fr; }
    .word-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .word-stats-grid > div { border-right: 1px solid var(--ink) !important; border-bottom: 1px solid var(--ink); }
    .word-stats-grid > div:nth-child(even) { border-right: 0 !important; }
    .word-stats-grid > div:nth-last-child(-n+2) { border-bottom: 0; }
    .qr-preview { min-height: 280px; }
    .image-canvas-wrap { min-height: 260px; }
    .division-toolbar { align-items: stretch; flex-direction: column; }
    .division-mode-switch { width: 100%; }
    .division-mode-switch .mode-button { width: 100%; }
    .division-decimal-places { grid-template-columns: 1fr; }
    .division-answer-panel { grid-template-columns: 1fr; }
    .division-answer-panel > span { grid-row: auto; writing-mode: horizontal-tb; transform: none; }
    .division-step-card { grid-template-columns: 42px minmax(0, 1fr); }
}