.binary-addition-expression,
.binary-addition-calculation {
    width: fit-content;
    max-width: 100%;
    margin: 1rem auto;
    padding: 0.85rem 1.25rem;
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: #f8fafc;
    color: #0f172a;
    font-family: "Courier New", monospace;
    font-size: 1.25rem;
    font-weight: 900;
    text-align: center;
    overflow-wrap: anywhere;
}

.binary-addition-block {
    width: fit-content;
    max-width: 100%;
    margin: 1rem auto;
    padding: 1rem 1.25rem;
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: #0f172a;
    color: #f8fafc;
    overflow-x: auto;
}

.binary-addition-block code {
    font-family: "Courier New", monospace;
    font-size: 1.2rem;
    line-height: 1.45;
}

.binary-addition-widget {
    margin: 1.5rem 0;
    padding: 1.35rem;
    border: 1px solid #dbe3ef;
    border-radius: 24px;
    background:
        radial-gradient(circle at top right, rgba(91, 95, 168, 0.13), transparent 30%),
        radial-gradient(circle at bottom left, rgba(230, 0, 79, 0.05), transparent 28%),
        white;
    color: #0f172a;
    box-shadow: 0 16px 42px rgba(15, 23, 42, 0.08);
}

.binary-addition-widget-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.binary-addition-widget-header h3 {
    margin: 0.2rem 0 0;
}

.binary-addition-eyebrow {
    margin: 0;
    color: #5b5fa8;
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.binary-addition-summary-card {
    min-width: 220px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.85rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: #f8fafc;
}

.binary-addition-summary-card span {
    color: #64748b;
    font-size: 0.74rem;
    font-weight: 900;
    text-transform: uppercase;
}

.binary-addition-summary-card strong {
    margin: 0.15rem 0;
    color: #5b5fa8;
    font-family: "Courier New", monospace;
    font-size: 1.65rem;
    line-height: 1;
    letter-spacing: 0.06em;
}

.binary-addition-summary-card small {
    color: #334155;
    font-weight: 800;
    text-align: center;
}

.binary-addition-summary-card.overflow {
    border-color: #fed7aa;
    background: #fff7ed;
}

.binary-addition-summary-card.overflow strong,
.binary-addition-summary-card.overflow small {
    color: #9a3412;
}

.binary-addition-input-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.binary-addition-input-card {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    background: #f8fafc;
}

.binary-addition-input-card label {
    color: #475569;
    font-size: 0.86rem;
    font-weight: 800;
}

.binary-addition-input-card input {
    width: 100%;
    box-sizing: border-box;
    padding: 0.8rem 0.9rem;
    border: 1px solid #cbd5e1;
    border-radius: 14px;
    background: white;
    color: #0f172a;
    font-family: "Courier New", monospace;
    font-size: 1.15rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    outline: none;
}

.binary-addition-input-card input:focus {
    border-color: #5b5fa8;
    box-shadow: 0 0 0 4px rgba(91, 95, 168, 0.12);
}

.binary-addition-input-card small {
    color: #475569;
    font-weight: 800;
}

.binary-addition-button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin: 1rem 0;
}

.binary-addition-button-row button:disabled {
    opacity: 0.45;
    cursor: default;
    transform: none;
}

.binary-addition-feedback {
    margin: 1rem 0;
    padding: 0.8rem 1rem;
    border: 1px solid #bfdbfe;
    border-radius: 16px;
    background: #eff6ff;
    color: #1e3a8a;
    font-weight: 800;
}

.binary-addition-feedback.success {
    border-color: #bbf7d0;
    background: #f0fdf4;
    color: #166534;
}

.binary-addition-feedback.error {
    border-color: #fed7aa;
    background: #fff7ed;
    color: #9a3412;
}

.binary-addition-working-card {
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    background: #f8fafc;
}

.binary-addition-working-card h4 {
    margin-top: 0;
}

.binary-addition-working {
    display: grid;
    grid-template-columns: 90px repeat(9, minmax(38px, 1fr));
    gap: 0.35rem;
    align-items: center;
    overflow-x: auto;
}

.binary-addition-row-label {
    color: #475569;
    font-size: 0.78rem;
    font-weight: 900;
    text-align: right;
    text-transform: uppercase;
}

.binary-addition-bit-cell {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0.35rem;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: white;
    color: #334155;
    font-family: "Courier New", monospace;
    font-size: 1.2rem;
    font-weight: 900;
}

.binary-addition-bit-cell.empty {
    background: transparent;
    border-color: transparent;
}

.binary-addition-bit-cell.carry {
    background: #fff7ed;
    border-color: #fed7aa;
    color: #9a3412;
}

.binary-addition-bit-cell.result {
    background: #eef2ff;
    border-color: #c7d2fe;
    color: #34387f;
}

.binary-addition-bit-cell.final-carry {
    background: #fff7ed;
    border-color: #fb923c;
    color: #9a3412;
}

.binary-addition-bit-cell.active {
    transform: translateY(-3px);
    border-color: #e6004f;
    box-shadow:
        0 12px 24px rgba(230, 0, 79, 0.15),
        0 0 0 4px rgba(230, 0, 79, 0.08);
}

.binary-addition-data-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    margin: 1rem 0;
}

.binary-addition-data-card,
.binary-addition-explanation-card {
    padding: 0.9rem;
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: #f8fafc;
}

.binary-addition-data-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.binary-addition-data-card span,
.binary-addition-explanation-card span {
    color: #64748b;
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
}

.binary-addition-data-card strong,
.binary-addition-explanation-card strong {
    color: #0f172a;
    font-family: "Courier New", monospace;
    text-align: center;
    overflow-wrap: anywhere;
}

.binary-addition-explanation-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1rem;
}

.binary-addition-explanation-card.overflow {
    border-color: #fed7aa;
    background: #fff7ed;
}

.binary-addition-explanation-card.overflow strong {
    color: #9a3412;
}

.binary-addition-challenge {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(230px, 0.8fr);
    gap: 1rem;
    padding: 1rem;
    border: 1px solid #e9d5ff;
    border-radius: 20px;
    background: #faf5ff;
    color: #581c87;
}

.binary-addition-challenge h4 {
    margin: 0.15rem 0 0.45rem;
}

.binary-addition-answer-area {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.binary-addition-challenge-option {
    padding: 0.55rem 0.9rem;
    border: 1px solid #d8b4fe;
    border-radius: 999px;
    background: white;
    color: #6b21a8;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s ease;
}

.binary-addition-challenge-option:hover {
    background: #6b21a8;
    border-color: #6b21a8;
    color: white;
}

.binary-addition-challenge-message {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 800;
}

.binary-addition-challenge-message.success {
    color: #166534;
}

.binary-addition-challenge-message.error {
    color: #9a3412;
}

@media (max-width: 900px) {
    .binary-addition-input-grid,
    .binary-addition-challenge {
        grid-template-columns: 1fr;
    }

    .binary-addition-data-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .binary-addition-widget-header {
        flex-direction: column;
    }

    .binary-addition-summary-card {
        width: 100%;
        box-sizing: border-box;
    }

    .binary-addition-working {
        grid-template-columns: 78px repeat(9, minmax(34px, 1fr));
    }
}

@media (max-width: 430px) {
    .binary-addition-data-grid {
        grid-template-columns: 1fr;
    }
}