/* Connect Four — Styles */
.c4-shell {
    max-width: 520px;
}

.c4-board {
    display: inline-grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    background: rgba(56, 178, 172, 0.1);
    border: 2px solid var(--gb-border);
    border-radius: var(--gb-radius);
    padding: 10px;
}

.c4-cell {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid var(--gb-border);
    cursor: pointer;
    transition: all var(--gb-transition);
}

.c4-cell:hover {
    border-color: var(--gb-accent);
    background: rgba(56, 178, 172, 0.15);
}

.c4-cell.red {
    background: #f56565;
    border-color: #f56565;
}

.c4-cell.yellow {
    background: #ecc94b;
    border-color: #ecc94b;
}

.c4-cell.winning {
    animation: pulse 0.5s ease infinite alternate;
}

@keyframes pulse {
    from { transform: scale(1); }
    to { transform: scale(1.1); }
}

@media (max-width: 450px) {
    .c4-cell {
        width: 36px;
        height: 36px;
    }
    .c4-board {
        gap: 4px;
        padding: 6px;
    }
}