.bit-control-widget {
    margin: 1.5rem 0;
    padding: 1.25rem;
    border-radius: 24px;
    background: linear-gradient(135deg, #f8fafc, #eef2ff);
    border: 1px solid #dbeafe;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

.bc-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1rem;
}

.bc-action-btn {
    border: 1px solid #cbd5e1;
    background: white;
    color: #334155;
    border-radius: 999px;
    padding: 0.55rem 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.bc-action-btn:hover,
.bc-action-btn.active {
    background: #0f172a;
    color: white;
    border-color: #0f172a;
    transform: translateY(-1px);
}

.bc-layout {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    align-items: stretch;
}

.bc-memory-card,
.bc-operation-card,
.bc-result-card,
.bc-flag-card {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    padding: 1rem;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.05);
}

.bc-small-label {
    display: block;
    color: #64748b;
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.65rem;
}

.bc-byte-row,
.bc-mask-display {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0.25rem;
    margin: 0.7rem 0 1rem;
}

.bc-bit {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    color: #0f172a;
    font-weight: 900;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    position: relative;
}

.bc-bit::after {
    content: attr(data-position);
    position: absolute;
    bottom: -1.05rem;
    font-size: 0.62rem;
    color: #64748b;
    font-weight: 700;
}

.bc-bit.target {
    background: #fff7ed;
    border-color: #fb923c;
    color: #9a3412;
}

.bc-bit.changed {
    background: #dcfce7;
    border-color: #22c55e;
    color: #14532d;
}

.bc-operation-card strong {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #0f172a;
}

.bc-operation-card p,
.bc-result-text {
    color: #475569;
    font-weight: 650;
}

.bc-memory-card label {
    display: block;
    margin-top: 1.2rem;
    font-weight: 700;
    color: #334155;
}

#bcByteInput {
    width: 100%;
    box-sizing: border-box;
    margin-top: 0.35rem;
    padding: 0.7rem 0.85rem;
    border-radius: 14px;
    border: 1px solid #cbd5e1;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.bc-error {
    min-height: 1.2rem;
    color: #b91c1c;
    font-weight: 700;
    margin: 0.45rem 0 0;
}

.bc-flag-panel {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-top: 1rem;
}

.bc-flag-card strong {
    display: block;
    color: #0f172a;
    margin-bottom: 0.25rem;
}

.bc-flag-card span {
    color: #64748b;
    font-weight: 700;
}

@media (max-width: 850px) {
    .bc-layout,
    .bc-flag-panel {
        grid-template-columns: 1fr;
    }
}