.board-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(42px, 1fr));
    grid-template-rows: repeat(12, minmax(42px, 1fr));
    gap: 4px;
    width: min(100%, 320px);
    margin: 0 auto;
    padding: 10px;
    background: rgba(15, 23, 42, 0.95);
    border-radius: 24px;
    border: 1px solid rgba(255,255,255,0.08);
}

.cell {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    box-shadow: inset 0 4px 8px rgba(0,0,0,0.18);
}

.block {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.block-red { background: #f87171; }
.block-orange { background: #fb923c; }
.block-yellow { background: #fbbf24; }
.block-green { background: #34d399; }
.block-blue { background: #60a5fa; }

.control-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin: 18px auto 12px;
    width: min(100%, 320px);
}

.control-button {
    background: var(--surface-color);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    border-radius: 16px;
    font-size: 1.1rem;
    padding: 16px 0;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.15s ease;
}

.control-button:hover {
    background: var(--hover-bg);
    transform: translateY(-2px);
}

.next-box {
    padding: 12px 16px;
    border-radius: 18px;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(255,255,255,0.1);
}

.next-pair {
    display: grid;
    grid-template-columns: repeat(2, 30px);
    gap: 8px;
    justify-content: center;
    margin-top: 6px;
}

.next-pair .block {
    width: 30px;
    height: 30px;
    box-shadow: none;
}

.game-help {
    color: var(--text-secondary);
    font-size: 0.95rem;
    text-align: center;
    margin-top: 4px;
}

@media (max-width: 640px) {
    .board-grid {
        grid-template-columns: repeat(6, minmax(38px, 1fr));
        grid-template-rows: repeat(12, minmax(38px, 1fr));
    }
    .control-panel {
        grid-template-columns: repeat(4, minmax(60px, 1fr));
    }
}