.dfc-calculator {
    color-scheme: light;
    --page: #f3f4f6;
    --surface: #ffffff;
    --surface-soft: #f7f7f8;
    --ink: #111111;
    --muted: #5c5c5c;
    --line: #d2d2d2;
    --line-strong: #111111;
    --shadow: 0 18px 54px rgba(0, 0, 0, 0.08);
    --preview-gap: 4px;
    --panel-full: 84px;
    --panel-half: 40px;
    --panel-height: 40px;
    --edge-width: 20px;
    --edge-height-horizontal: 20px;
    --corner-height: 40px;
}

.dfc-calculator * {
    box-sizing: border-box;
}

.dfc-calculator {
    margin: 0;
    padding: 32px;
    display: flex;
    justify-content: center;
    font-family: Montserrat, Arial, sans-serif;
    font-weight: 400;
    color: var(--ink);
    background: linear-gradient(135deg, #ffffff 0%, var(--page) 100%);
}

.dfc-calculator button,
.dfc-calculator select {
    font: inherit;
}

.dfc-container {
    width: min(1120px, 100%);
}

.dfc-calculator .page-header {
    display: flex;
    justify-content: space-between;
    gap: 32px;
    align-items: end;
    margin-bottom: 24px;
}

.dfc-calculator .page-header p {
    max-width: 430px;
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

.dfc-calculator .eyebrow {
    margin: 0 0 8px;
    color: var(--ink);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

.dfc-calculator h2,
.dfc-calculator p {
    margin-top: 0;
}

.dfc-calculator h2 {
    margin-bottom: 0;
    font-size: 1.1rem;
}

.dfc-calculator .calculator-shell {
    display: grid;
    grid-template-columns: minmax(280px, 0.92fr) minmax(340px, 1.08fr);
    gap: 18px;
    margin-bottom: 18px;
}

.dfc-calculator .controls-panel,
.dfc-calculator .results-panel,
.dfc-calculator .visual-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 0;
    box-shadow: var(--shadow);
}

.dfc-calculator .controls-panel,
.dfc-calculator .results-panel {
    padding: 22px;
}

.dfc-calculator .field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.dfc-calculator .field {
    display: grid;
    gap: 8px;
}

.dfc-calculator .field.is-hidden {
    display: none;
}

.dfc-calculator label {
    color: var(--ink);
    font-size: 0.85rem;
    font-weight: 700;
}

.dfc-calculator select {
    width: 100%;
    min-height: 48px;
    padding: 0 42px 0 14px;
    color: var(--ink);
    background-color: var(--surface-soft);
    border: 1px solid var(--line);
    border-radius: 0;
    cursor: pointer;
}

.dfc-calculator select:focus-visible,
.dfc-calculator button:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 2px;
}

.dfc-calculator button {
    width: 100%;
    min-height: 50px;
    margin-top: 18px;
    padding: 12px 18px;
    color: #ffffff;
    background: #000000;
    border: 0;
    border-radius: 0;
    font-weight: 800;
    cursor: pointer;
    transition: background 160ms ease, color 160ms ease;
}

.dfc-calculator button:hover {
    color: #000000;
    background: #ffffff;
    box-shadow: inset 0 0 0 1px #000000;
}

.dfc-calculator .results-header,
.dfc-calculator .visual-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.dfc-calculator .floor-size {
    flex: 0 0 auto;
    padding: 8px 10px;
    color: #ffffff;
    background: #000000;
    border-radius: 0;
    font-size: 0.84rem;
    font-weight: 800;
}

.dfc-calculator .results-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 20px;
}

.dfc-calculator .result-card {
    min-height: 92px;
    padding: 16px;
    background: var(--surface-soft);
    border: 1px solid var(--line);
    border-radius: 0;
}

.dfc-calculator .result-value {
    display: block;
    margin-bottom: 5px;
    font-size: 2rem;
    line-height: 1;
    font-weight: 800;
}

.dfc-calculator .result-label {
    color: var(--muted);
    font-size: 0.86rem;
    font-weight: 700;
}

.dfc-calculator .empty-state,
.dfc-calculator .visual-empty {
    margin: 0;
    color: var(--muted);
}

.dfc-calculator .empty-state {
    grid-column: 1 / -1;
    padding: 20px;
    background: var(--surface-soft);
    border: 1px dashed var(--line);
    border-radius: 0;
}

.dfc-calculator .visual-panel {
    padding: 22px;
    overflow: hidden;
}

.dfc-calculator .legend {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
    color: var(--muted);
    font-size: 0.84rem;
    font-weight: 700;
}

.dfc-calculator .legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.dfc-calculator .swatch {
    width: 14px;
    height: 14px;
    border: 1px solid var(--line-strong);
    border-radius: 0;
}

.dfc-calculator .white-swatch {
    background: #ffffff;
}

.dfc-calculator .black-swatch {
    background: #000000;
}

.dfc-calculator .edge-swatch {
    background: repeating-linear-gradient(
        45deg,
        #ffffff 0,
        #ffffff 3px,
        #b8b8b8 3px,
        #b8b8b8 6px
    );
}

.dfc-calculator [data-dfc="visual"] {
    margin-top: 18px;
    padding: 20px;
    overflow-x: auto;
    background: #f8f8f8;
    border: 1px solid var(--line);
    border-radius: 0;
    text-align: center;
}

.dfc-calculator .floor-plan {
    display: inline-grid;
    gap: var(--preview-gap);
    min-width: max-content;
}

.dfc-calculator .edged-floor {
    display: inline-grid;
    grid-template-columns: var(--edge-width) auto var(--edge-width);
    grid-template-rows: var(--edge-height-horizontal) auto var(--edge-height-horizontal);
    gap: var(--preview-gap);
    min-width: max-content;
    padding: 16px;
    background: #ffffff;
    border: 1px solid #dedede;
}

.dfc-calculator .panel-area {
    grid-column: 2;
    grid-row: 2;
}

.dfc-calculator .top-edge,
.dfc-calculator .bottom-edge {
    display: flex;
    gap: var(--preview-gap);
}

.dfc-calculator .top-edge {
    grid-column: 2;
    grid-row: 1;
}

.dfc-calculator .bottom-edge {
    grid-column: 2;
    grid-row: 3;
}

.dfc-calculator .left-edge,
.dfc-calculator .right-edge {
    display: flex;
    flex-direction: column;
    gap: var(--preview-gap);
    height: 100%;
    padding-top: calc(var(--panel-height) / 2);
    padding-bottom: calc(var(--panel-height) / 2);
    justify-content: flex-start;
}

.dfc-calculator .left-edge {
    grid-column: 1;
    grid-row: 2;
}

.dfc-calculator .right-edge {
    grid-column: 3;
    grid-row: 2;
}

.dfc-calculator .edge-piece {
    display: grid;
    place-items: center;
    color: #3a3a3a;
    background: #b5b5b5;
    border: 1px solid #ffffff;
    border-radius: 0;
    font-size: 0.66rem;
    font-weight: 800;
    line-height: 1;
    text-transform: uppercase;
}

.dfc-calculator .edge-piece {
    color: transparent;
}

.dfc-calculator .edge-piece:hover {
    color: #111111;
}

.dfc-calculator .full-edge {
    background: #b5b5b5;
}

.dfc-calculator .half-edge {
    background: #8f8f8f;
}

.dfc-calculator .corner-edge {
    width: var(--edge-width);
    height: var(--corner-height);
    background: #5f5f5f;
    border: 1px solid #5f5f5f;
    border-radius: 0;
    align-self: start;
    z-index: 1;
}

.dfc-calculator .right-corner {
    background: #5f5f5f;
}

.dfc-calculator .top-left {
    grid-column: 1;
    grid-row: 1;
}

.dfc-calculator .top-right {
    grid-column: 3;
    grid-row: 1;
}

.dfc-calculator .bottom-left {
    grid-column: 1;
    grid-row: 3;
    align-self: end;
}

.dfc-calculator .bottom-right {
    grid-column: 3;
    grid-row: 3;
    align-self: end;
}

.dfc-calculator .edge-piece.horizontal {
    height: var(--edge-height-horizontal);
}

.dfc-calculator .edge-piece.vertical {
    width: var(--edge-width);
    writing-mode: vertical-rl;
}

.dfc-calculator .full-edge.horizontal {
    width: var(--panel-full);
}

.dfc-calculator .half-edge.horizontal {
    width: var(--panel-half);
}

.dfc-calculator .full-edge.vertical {
    height: calc((var(--panel-height) * 2) + var(--preview-gap));
}

.dfc-calculator .half-edge.vertical {
    height: var(--panel-height);
}

.dfc-calculator .row {
    display: flex;
    gap: var(--preview-gap);
}

.dfc-calculator .fullPanel,
.dfc-calculator .halfPanel {
    display: grid;
    place-items: center;
    height: var(--panel-height);
    border: 1px solid #9a9a9a;
    border-radius: 0;
    font-size: 0.7rem;
    font-weight: 800;
    line-height: 1;
}

.dfc-calculator .panel-number {
    display: grid;
    place-items: center;
    min-width: 24px;
    height: 24px;
    padding: 0 6px;
    color: #ffffff;
    background: #8f8f8f;
    border-radius: 0;
    font-size: 0.78rem;
    font-weight: 800;
}

.dfc-calculator .fullPanel {
    width: var(--panel-full);
}

.dfc-calculator .halfPanel {
    width: var(--panel-half);
}

.dfc-calculator .checkered-panel {
    position: relative;
    grid-template-columns: 1fr 1fr;
    overflow: hidden;
}

.dfc-calculator .check-square {
    width: 100%;
    height: 100%;
}

.dfc-calculator .black-square {
    background: #151515;
}

.dfc-calculator .white-square {
    background: #ffffff;
}

.dfc-calculator .checkered-panel .panel-number {
    position: absolute;
    z-index: 1;
}

.dfc-calculator .hide-panel-numbers .panel-number {
    display: none;
}

.dfc-calculator .whiteFloor .fullPanel,
.dfc-calculator .whiteFloor .halfPanel {
    background: #ffffff;
    color: #000000;
}

.dfc-calculator .blackFloor .fullPanel,
.dfc-calculator .blackFloor .halfPanel {
    background: #151515;
    color: #ffffff;
}

.dfc-calculator .white-panel {
    background: #ffffff;
    color: #000000;
}

.dfc-calculator .black-panel {
    background: #151515;
    color: #ffffff;
}

.dfc-calculator .black-panel .panel-number,
.dfc-calculator .blackFloor .panel-number,
.dfc-calculator .stripedFloor.whiteFirst .row:nth-child(even) .panel-number,
.dfc-calculator .stripedFloor.blackFirst .row:nth-child(odd) .panel-number {
    color: #151515;
    background: #ffffff;
}

.dfc-calculator .stripedFloor.whiteFirst .row:nth-child(odd) .fullPanel,
.dfc-calculator .stripedFloor.whiteFirst .row:nth-child(odd) .halfPanel {
    background: #ffffff;
    color: #000000;
}

.dfc-calculator .stripedFloor.whiteFirst .row:nth-child(even) .fullPanel,
.dfc-calculator .stripedFloor.whiteFirst .row:nth-child(even) .halfPanel {
    background: #151515;
    color: #ffffff;
}

.dfc-calculator .stripedFloor.blackFirst .row:nth-child(odd) .fullPanel,
.dfc-calculator .stripedFloor.blackFirst .row:nth-child(odd) .halfPanel {
    background: #151515;
    color: #ffffff;
}

.dfc-calculator .stripedFloor.blackFirst .row:nth-child(even) .fullPanel,
.dfc-calculator .stripedFloor.blackFirst .row:nth-child(even) .halfPanel {
    background: #ffffff;
    color: #000000;
}

.dfc-calculator .dfc-credit {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.5;
    text-align: center;
}

.dfc-calculator .dfc-credit a {
    color: var(--ink);
    font-weight: 800;
    text-decoration: underline;
    text-underline-offset: 3px;
}

@media (max-width: 820px) {
    .dfc-calculator {
        padding: 18px;
    }

    .dfc-calculator .page-header,
    .dfc-calculator .calculator-shell {
        grid-template-columns: 1fr;
    }

    .dfc-calculator .page-header {
        display: grid;
        align-items: start;
        gap: 14px;
    }
}

@media (max-width: 560px) {
    .dfc-calculator {
        padding: 12px;
        --preview-gap: 3px;
        --panel-full: 42px;
        --panel-half: 20px;
        --panel-height: 20px;
        --edge-width: 10px;
        --edge-height-horizontal: 10px;
        --corner-height: 20px;
    }

    .dfc-calculator .controls-panel,
    .dfc-calculator .results-panel,
    .dfc-calculator .visual-panel {
        padding: 16px;
    }

    .dfc-calculator .field-grid,
    .dfc-calculator .results-grid {
        grid-template-columns: 1fr;
    }

    .dfc-calculator .results-header,
    .dfc-calculator .visual-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .dfc-calculator .legend {
        justify-content: flex-start;
    }

    .dfc-calculator [data-dfc="visual"] {
        padding: 10px;
        text-align: left;
    }

    .dfc-calculator .edged-floor {
        padding: 8px;
    }

    .dfc-calculator .fullPanel,
    .dfc-calculator .halfPanel {
        height: var(--panel-height);
        font-size: 0.56rem;
    }

    .dfc-calculator .fullPanel {
        width: var(--panel-full);
    }

    .dfc-calculator .halfPanel {
        width: var(--panel-half);
    }

    .dfc-calculator .panel-number {
        min-width: 16px;
        height: 16px;
        padding: 0 4px;
        font-size: 0.56rem;
    }

    .dfc-calculator .edge-piece {
        font-size: 0.48rem;
    }

    .dfc-calculator .dfc-credit {
        font-size: 0.8rem;
    }
}