#boardContainer {
    border-collapse: collapse;
    width: 100%;
    table-layout: fixed;
    background-color: #ddd;
}

#boardContainer td {
    padding: 8px;
    vertical-align: top;
    border: 0;
    background-color: #ddd;
}

.basis {
    display: flex;
    gap: 1px;
    align-items: center;
    width: 100%;
    background: transparent;
}

.basis .key {
    font-weight: 700;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 0 0 40px;
    width: 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 16px;
}

.basis .key .key-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

.basis .key .eq {
    flex: 0 0 14px;
    width: 14px;
    text-align: center;
    opacity: 0.95;
}

.basis .values {
    display: grid;
    gap: 1px;
    width: 100%;
}

.basis .val {
    text-align: center;
    font-family: monospace;
    font-size: 16px;
}

.basis.clickable {
    cursor: pointer;
}

.basis.selected {
    outline: 2px solid var(--basis-selected-outline, rgba(0, 150, 0, 0.35));
    background-color: var(--basis-selected-bg, rgba(0, 150, 0, 0.06));
    border-radius: 4px;
}

.board-wrapper {
    display: block;
    position: relative;
}

.basis-panel {
    position: absolute;
    width: 260px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
    background: #fff;
    border: 1px solid #eee;
    padding: 8px;
    box-sizing: border-box;
    display: none;
    z-index: 30;
    font-size: 16px;
}

.basis-panel.visible {
    display: block;
}

.basis-panel .panel-header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 8px;
    font-weight: 700;
    font-size: 18px;
    position: relative;
}

.basis-panel .panel-close {
    cursor: pointer;
    border: 0;
    background: transparent;
    font-size: 16px;
    line-height: 1;
    position: absolute;
    right: 8px;
}

.basis-panel .panel-grid {
    display: block;
}

.basis-panel .panel-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    align-items: center;
    border-bottom: 1px solid #eee;
}

.basis-panel .panel-row:last-child {
    border-bottom: none;
}

.basis-panel .panel-cell {
    padding: 6px 4px;
    text-align: center;
    border: none;
    font-family: monospace;
    line-height: 1;
}

.basis-panel .panel-row.panel-row-bold .panel-cell {
    font-weight: bold;
    font-size: 24px;
}

.calc-container {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.calc-bits {
    display: inline-flex;
    flex-direction: column;
    gap: 6px;
}

.calc-row {
    display: flex;
    gap: 8px;
}

.calc-bit {
    width: 38px;
    height: 38px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
    background: #fbb;
    color: #600;
    border: 1px solid #c44;
    box-sizing: border-box;
}

.calc-bit.on {
    background: #bfb;
    color: #063;
    border: 1px solid #3a3;
}

.calc-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.calc-set-btn {
    appearance: none;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    background: linear-gradient(#dff8e8, #bff4c7);
    color: #063;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 2px 0 #0002, inset 0 1px 0 #fff;
}

.big-area {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    margin-top: 8px;
}

.big-boxes {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.big-row {
    display: flex;
    gap: 0;
}

.big-cell {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #000;
    background: #fff;
    box-sizing: border-box;
    font-weight: 600;
    margin: 0;
    cursor: pointer;
    user-select: none;
    border-radius: 50%;
}

.big-cell.on {
    background: #bfb;
    color: #063;
    border-color: #3a3;
}

.big-cell.off {
    background: #fbb;
    color: #600;
    border-color: #c44;
}

.big-cell.empty {
    background: #fff;
    color: #000;
    cursor: default;
}

.letter-area {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    margin-top: 12px;
}

.letter-block {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.letter-row,
.num-row {
    display: flex;
    gap: 0;
}

.letter-cell {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #000;
    box-sizing: border-box;
    font-weight: 700;
    margin: 0;
}

.letter-cell.on {
    background: rgb(108, 255, 79);
    color: #063;
    border-color: #287;
}

.letter-cell.zero {
    background: rgb(210, 255, 201);
    color: #063;
    border-color: #6a6;
}

.letter-cell.off {
    background: #fbb;
    color: #600;
    border-color: #c44;
}

.num-cell {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #000;
    box-sizing: border-box;
    margin: 0;
    cursor: pointer;
}

.num-cell.on {
    background: rgb(108, 255, 79);
    color: #063;
    border-color: #287;
}

.num-cell.zero {
    background: rgb(210, 255, 201);
    color: #063;
    border-color: #6a6;
}

.num-cell.off {
    background: #fbb;
    color: #600;
    border-color: #c44;
}

.big-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.big-set-btn {
    appearance: none;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    background: linear-gradient(#dff8e8, #bff4c7);
    color: #063;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 2px 0 #0002, inset 0 1px 0 #fff;
}

.resetButton {
    appearance: none;
    border: 1px solid #c44;
    background-color: #fdd;
    color: #000;
    padding: 8px 12px;
    border-radius: 6px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 2px 0 #0002, inset 0 1px 0 #fff;
}

.resetButton:hover {
    background-color: #fcc;
}

.resetButton:active {
    background-color: #faa;
    box-shadow: #0004 1px 1px 4px;
    transform: translate(1px, 1px);
}

.calc-section {
    margin-bottom: 18px;
}

.formula-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.formula-title {
    margin: 0;
}

.intro-spacer {
    margin-bottom: 10px;
}